* [PATCH v5 01/12] dt-bindings: arm: add Ambarella CV75 platforms
2026-08-18 10:31 [PATCH v5 00/12] Ambarella CV75 SoC minimal bring-up Long Zhao via B4 Relay
@ 2026-08-18 10:31 ` Long Zhao via B4 Relay
2026-08-18 10:31 ` [PATCH v5 02/12] dt-bindings: mfd: syscon: add Ambarella CV75 secure scratchpad Long Zhao via B4 Relay
` (10 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Long Zhao via B4 Relay @ 2026-08-18 10:31 UTC (permalink / raw)
To: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Michael Turquette,
Stephen Boyd, Linus Walleij, Bartosz Golaszewski,
Greg Kroah-Hartman, Jiri Slaby, Andy Shevchenko, Catalin Marinas,
Will Deacon, devicetree, linux-clk, linux-gpio, linux-serial,
linux-kernel, Brian Masney, Lee Jones, mfd, Long Zhao, Long Zhao,
Krzysztof Kozlowski
From: Long Zhao <longzhao@ambarella.com>
Add the Ambarella vendor prefix and CV75 EVK board compatible for the
initial SoC bring-up.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
.../devicetree/bindings/arm/ambarella.yaml | 24 ++++++++++++++++++++++
.../devicetree/bindings/vendor-prefixes.yaml | 2 ++
2 files changed, 26 insertions(+)
diff --git a/Documentation/devicetree/bindings/arm/ambarella.yaml b/Documentation/devicetree/bindings/arm/ambarella.yaml
new file mode 100644
index 000000000000..72946e94fa76
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/ambarella.yaml
@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/ambarella.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ambarella SoC platforms
+
+maintainers:
+ - Long Zhao <longzhao@ambarella.com>
+
+properties:
+ $nodename:
+ const: "/"
+
+ compatible:
+ oneOf:
+ - description: Ambarella CV75 boards
+ items:
+ - enum:
+ - ambarella,cv75-evk
+ - const: ambarella,cv75
+
+additionalProperties: true
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 85a27937832e..f48aa6dabbe9 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -112,6 +112,8 @@ patternProperties:
description: Amarula Solutions
"^amazon,.*":
description: Amazon.com, Inc.
+ "^ambarella,.*":
+ description: Ambarella, Inc.
"^amcc,.*":
description: Applied Micro Circuits Corporation (APM, formally AMCC)
"^amd,.*":
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread* [PATCH v5 02/12] dt-bindings: mfd: syscon: add Ambarella CV75 secure scratchpad
2026-08-18 10:31 [PATCH v5 00/12] Ambarella CV75 SoC minimal bring-up Long Zhao via B4 Relay
2026-08-18 10:31 ` [PATCH v5 01/12] dt-bindings: arm: add Ambarella CV75 platforms Long Zhao via B4 Relay
@ 2026-08-18 10:31 ` Long Zhao via B4 Relay
2026-08-18 10:31 ` [PATCH v5 03/12] dt-bindings: clock: add Ambarella CV75 RCT Long Zhao via B4 Relay
` (9 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Long Zhao via B4 Relay @ 2026-08-18 10:31 UTC (permalink / raw)
To: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Michael Turquette,
Stephen Boyd, Linus Walleij, Bartosz Golaszewski,
Greg Kroah-Hartman, Jiri Slaby, Andy Shevchenko, Catalin Marinas,
Will Deacon, devicetree, linux-clk, linux-gpio, linux-serial,
linux-kernel, Brian Masney, Lee Jones, mfd, Long Zhao, Long Zhao
From: Long Zhao <longzhao@ambarella.com>
Allow ambarella,cv75-sec-scratchpad as a syscon for the shared secure
scratchpad registers on CV75.
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
Documentation/devicetree/bindings/mfd/syscon.yaml | 1 +
1 file changed, 1 insertion(+)
diff --git a/Documentation/devicetree/bindings/mfd/syscon.yaml b/Documentation/devicetree/bindings/mfd/syscon.yaml
index fe882d3f828b..9ebf702c06f1 100644
--- a/Documentation/devicetree/bindings/mfd/syscon.yaml
+++ b/Documentation/devicetree/bindings/mfd/syscon.yaml
@@ -32,6 +32,7 @@ properties:
- allwinner,sun50i-a64-system-controller
- altr,l3regs
- altr,sdr-ctl
+ - ambarella,cv75-sec-scratchpad
- amd,pensando-elba-syscon
- amlogic,meson-mx-assist
- amlogic,meson-mx-bootrom
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread* [PATCH v5 03/12] dt-bindings: clock: add Ambarella CV75 RCT
2026-08-18 10:31 [PATCH v5 00/12] Ambarella CV75 SoC minimal bring-up Long Zhao via B4 Relay
2026-08-18 10:31 ` [PATCH v5 01/12] dt-bindings: arm: add Ambarella CV75 platforms Long Zhao via B4 Relay
2026-08-18 10:31 ` [PATCH v5 02/12] dt-bindings: mfd: syscon: add Ambarella CV75 secure scratchpad Long Zhao via B4 Relay
@ 2026-08-18 10:31 ` Long Zhao via B4 Relay
2026-08-18 10:31 ` [PATCH v5 04/12] dt-bindings: pinctrl: add Ambarella CV75 pinctrl Long Zhao via B4 Relay
` (8 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Long Zhao via B4 Relay @ 2026-08-18 10:31 UTC (permalink / raw)
To: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Michael Turquette,
Stephen Boyd, Linus Walleij, Bartosz Golaszewski,
Greg Kroah-Hartman, Jiri Slaby, Andy Shevchenko, Catalin Marinas,
Will Deacon, devicetree, linux-clk, linux-gpio, linux-serial,
linux-kernel, Brian Masney, Lee Jones, mfd, Long Zhao, Long Zhao
From: Long Zhao <longzhao@ambarella.com>
Document the CV75 RCT clock controller and the clock ID header used by
DT consumers.
This initial binding describes only the clock-provider functionality.
Reset-controller support is outside scope of this series, so #reset-cells
property is intentionally omitted.
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
.../bindings/clock/ambarella,cv75-rct.yaml | 58 ++++++++++++++++++++++
include/dt-bindings/clock/ambarella,cv75-rct.h | 15 ++++++
2 files changed, 73 insertions(+)
diff --git a/Documentation/devicetree/bindings/clock/ambarella,cv75-rct.yaml b/Documentation/devicetree/bindings/clock/ambarella,cv75-rct.yaml
new file mode 100644
index 000000000000..eb5956fc32bc
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/ambarella,cv75-rct.yaml
@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/ambarella,cv75-rct.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ambarella CV75 RCT Clock Controller
+
+maintainers:
+ - Long Zhao <longzhao@ambarella.com>
+
+description: |
+ The RCT (Reset and Clock Tree) block on the Ambarella CV75 SoC provides
+ PLLs, clock muxes and dividers for on-chip peripherals.
+
+ The same register region is also exposed as a syscon for other SoC
+ blocks (e.g. pin drive-strength), hence the "syscon" compatible.
+
+ Clock indices are defined in include/dt-bindings/clock/ambarella,cv75-rct.h.
+
+properties:
+
+ compatible:
+ items:
+ - const: ambarella,cv75-rct
+ - const: syscon
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ description: Reference crystal oscillator (typically 24 MHz)
+ maxItems: 1
+
+ clock-names:
+ const: osc
+
+ "#clock-cells":
+ const: 1
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - clock-names
+ - "#clock-cells"
+
+additionalProperties: false
+
+examples:
+ - |
+ clock-controller@ed080000 {
+ compatible = "ambarella,cv75-rct", "syscon";
+ reg = <0xed080000 0x1000>;
+ clocks = <&osc>;
+ clock-names = "osc";
+ #clock-cells = <1>;
+ };
diff --git a/include/dt-bindings/clock/ambarella,cv75-rct.h b/include/dt-bindings/clock/ambarella,cv75-rct.h
new file mode 100644
index 000000000000..0a6e946c9108
--- /dev/null
+++ b/include/dt-bindings/clock/ambarella,cv75-rct.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
+/*
+ * Copyright (C) 2026 Ambarella, Inc.
+ */
+
+#ifndef _DT_BINDINGS_CLOCK_AMBARELLA_CV75_RCT_H
+#define _DT_BINDINGS_CLOCK_AMBARELLA_CV75_RCT_H
+
+/* Boot / bus clocks */
+#define CV75_GCLK_UART0 0
+#define CV75_GCLK_CORE 1
+#define CV75_GCLK_AHB 2
+#define CV75_GCLK_APB 3
+
+#endif
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread* [PATCH v5 04/12] dt-bindings: pinctrl: add Ambarella CV75 pinctrl
2026-08-18 10:31 [PATCH v5 00/12] Ambarella CV75 SoC minimal bring-up Long Zhao via B4 Relay
` (2 preceding siblings ...)
2026-08-18 10:31 ` [PATCH v5 03/12] dt-bindings: clock: add Ambarella CV75 RCT Long Zhao via B4 Relay
@ 2026-08-18 10:31 ` Long Zhao via B4 Relay
2026-08-18 10:31 ` [PATCH v5 05/12] dt-bindings: gpio: pl061: add Ambarella CV75 variant Long Zhao via B4 Relay
` (7 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Long Zhao via B4 Relay @ 2026-08-18 10:31 UTC (permalink / raw)
To: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Michael Turquette,
Stephen Boyd, Linus Walleij, Bartosz Golaszewski,
Greg Kroah-Hartman, Jiri Slaby, Andy Shevchenko, Catalin Marinas,
Will Deacon, devicetree, linux-clk, linux-gpio, linux-serial,
linux-kernel, Brian Masney, Lee Jones, mfd, Long Zhao, Long Zhao
From: Long Zhao <longzhao@ambarella.com>
Document the CV75 pin controller binding using generic function and
groups properties for pinmux configuration.
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
.../bindings/pinctrl/ambarella,cv75-pinctrl.yaml | 239 +++++++++++++++++++++
1 file changed, 239 insertions(+)
diff --git a/Documentation/devicetree/bindings/pinctrl/ambarella,cv75-pinctrl.yaml b/Documentation/devicetree/bindings/pinctrl/ambarella,cv75-pinctrl.yaml
new file mode 100644
index 000000000000..34054bc56c3b
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/ambarella,cv75-pinctrl.yaml
@@ -0,0 +1,239 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/ambarella,cv75-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ambarella CV75 Pin Controller
+
+maintainers:
+ - Long Zhao <longzhao@ambarella.com>
+
+description:
+ The Ambarella CV75 pin controller configures pin multiplexing, bias and
+ drive strength for the main GPIO banks. Pin groups and their mux settings
+ are defined by the pin controller driver and selected by function and group
+ names.
+
+allOf:
+ - $ref: pinctrl.yaml#
+
+properties:
+ compatible:
+ const: ambarella,cv75-pinctrl
+
+ reg:
+ maxItems: 1
+ description: IOMUX registers
+
+ ambarella,drive-strength-syscon:
+ $ref: /schemas/types.yaml#/definitions/phandle
+ description: RCT syscon containing the drive-strength registers.
+
+ ambarella,pull-syscon:
+ $ref: /schemas/types.yaml#/definitions/phandle
+ description: Secure scratchpad syscon containing the pull registers.
+
+patternProperties:
+ "^[a-z0-9-]+-pins$":
+ type: object
+ allOf:
+ - $ref: pinmux-node.yaml#
+ - $ref: pincfg-node.yaml#
+ additionalProperties: false
+
+ properties:
+ function:
+ enum:
+ - can0
+ - can1
+ - clk_au
+ - dmic0
+ - enet0
+ - hsync0
+ - hsync1
+ - i2c0
+ - i2c1
+ - i2c2
+ - i2c3
+ - i2cs
+ - i2s0
+ - i2s1
+ - ir
+ - pwm0
+ - pwm1
+ - pwm2
+ - pwm3
+ - pwm4
+ - pwm5
+ - pwm6
+ - pwm7
+ - pwm8
+ - pwm9
+ - pwm10
+ - pwm11
+ - sdmmc0
+ - sdmmc1
+ - snand
+ - spi0
+ - spi1
+ - spi2
+ - spi3
+ - spi_slave
+ - spinor
+ - uart0
+ - uart1
+ - uart2
+ - uart3
+ - uart4
+ - vin_master_sync
+ - vsync0
+ - vsync1
+ - vsync2
+ - vsync3
+ - wdt
+
+ groups:
+ items:
+ enum:
+ - can0
+ - can1
+ - clk_au
+ - dmic0
+ - enet_2nd_ref_clk_a
+ - enet_2nd_ref_clk_b
+ - enet_ext_osc_clk
+ - enet0_ptp_pps_o
+ - hsync0
+ - hsync1
+ - i2c0_a
+ - i2c0_b
+ - i2c1_a
+ - i2c1_b
+ - i2c2
+ - i2c3_a
+ - i2c3_b
+ - i2c3_c
+ - i2cs_a
+ - i2cs_b
+ - i2cs_c
+ - i2cs_d
+ - i2s0
+ - i2s1
+ - ir
+ - pwm0
+ - pwm1
+ - pwm2
+ - pwm3
+ - pwm4_a
+ - pwm4_b
+ - pwm5_a
+ - pwm5_b
+ - pwm6_a
+ - pwm6_b
+ - pwm7_a
+ - pwm7_b
+ - pwm8_a
+ - pwm8_b
+ - pwm9_a
+ - pwm9_b
+ - pwm10_a
+ - pwm10_b
+ - pwm11_a
+ - pwm11_b
+ - rgmii0
+ - rmii0
+ - sdmmc0_1bit
+ - sdmmc0_4bit
+ - sdmmc0_cd
+ - sdmmc0_hs_sel
+ - sdmmc0_reset
+ - sdmmc0_wp
+ - sdmmc1_1bit
+ - sdmmc1_4bit
+ - sdmmc1_cd
+ - sdmmc1_hs_sel
+ - sdmmc1_reset
+ - sdmmc1_wp
+ - snand
+ - spi0
+ - spi1
+ - spi2
+ - spi3_a
+ - spi3_b
+ - spi3_c
+ - spi_slave_a
+ - spi_slave_b
+ - spi_slave_c
+ - spi_slave_d
+ - spi_slave_e
+ - spinor
+ - uart0
+ - uart1
+ - uart1_flow
+ - uart2_a
+ - uart2_b
+ - uart2_c
+ - uart2_flow_a
+ - uart2_flow_b
+ - uart3_a
+ - uart3_b
+ - uart3_flow_a
+ - uart3_flow_b
+ - uart4_a
+ - uart4_b
+ - uart4_flow_a
+ - uart4_flow_b
+ - vin_master_sync_a
+ - vin_master_sync_b
+ - vin_master_sync_c
+ - vin_master_sync_d
+ - vin_master_sync_e
+ - vsync0
+ - vsync1
+ - vsync2
+ - vsync3
+ - wdt_a
+ - wdt_b
+ - wdt_c
+ - wdt_d
+ - wdt_e
+ - wdt_f
+ minItems: 1
+ maxItems: 6
+ uniqueItems: true
+
+ bias-disable: true
+ bias-pull-down: true
+ bias-pull-up: true
+
+ drive-strength:
+ enum: [3, 4, 5, 6, 7, 8, 9, 12]
+
+ required:
+ - function
+ - groups
+
+required:
+ - compatible
+ - reg
+ - ambarella,drive-strength-syscon
+ - ambarella,pull-syscon
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ pinctrl: pinctrl@e4010000 {
+ compatible = "ambarella,cv75-pinctrl";
+ reg = <0xe4010000 0x1000>;
+ ambarella,drive-strength-syscon = <&rct>;
+ ambarella,pull-syscon = <&scratchpad>;
+
+ uart0-pins {
+ function = "uart0";
+ groups = "uart0";
+ bias-disable;
+ drive-strength = <8>;
+ };
+ };
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread* [PATCH v5 05/12] dt-bindings: gpio: pl061: add Ambarella CV75 variant
2026-08-18 10:31 [PATCH v5 00/12] Ambarella CV75 SoC minimal bring-up Long Zhao via B4 Relay
` (3 preceding siblings ...)
2026-08-18 10:31 ` [PATCH v5 04/12] dt-bindings: pinctrl: add Ambarella CV75 pinctrl Long Zhao via B4 Relay
@ 2026-08-18 10:31 ` Long Zhao via B4 Relay
2026-08-18 10:31 ` [PATCH v5 06/12] dt-bindings: serial: add Ambarella CV75 UART Long Zhao via B4 Relay
` (6 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Long Zhao via B4 Relay @ 2026-08-18 10:31 UTC (permalink / raw)
To: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Michael Turquette,
Stephen Boyd, Linus Walleij, Bartosz Golaszewski,
Greg Kroah-Hartman, Jiri Slaby, Andy Shevchenko, Catalin Marinas,
Will Deacon, devicetree, linux-clk, linux-gpio, linux-serial,
linux-kernel, Brian Masney, Lee Jones, mfd, Long Zhao, Long Zhao
From: Long Zhao <longzhao@ambarella.com>
Document the Ambarella CV75 GPIO bank compatible and the synthetic
arm,primecell-periphid used with the PL061 binding.
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
.../devicetree/bindings/gpio/pl061-gpio.yaml | 35 +++++++++++++++++++---
1 file changed, 31 insertions(+), 4 deletions(-)
diff --git a/Documentation/devicetree/bindings/gpio/pl061-gpio.yaml b/Documentation/devicetree/bindings/gpio/pl061-gpio.yaml
index 4d970e55104b..414f8d4a3976 100644
--- a/Documentation/devicetree/bindings/gpio/pl061-gpio.yaml
+++ b/Documentation/devicetree/bindings/gpio/pl061-gpio.yaml
@@ -15,7 +15,9 @@ select:
properties:
compatible:
contains:
- const: arm,pl061
+ enum:
+ - arm,pl061
+ - ambarella,cv75-gpio
required:
- compatible
@@ -24,9 +26,20 @@ properties:
pattern: "^gpio@[0-9a-f]+$"
compatible:
- items:
- - const: arm,pl061
- - const: arm,primecell
+ oneOf:
+ - items:
+ - const: arm,pl061
+ - const: arm,primecell
+ - items:
+ - const: ambarella,cv75-gpio
+ - const: arm,primecell
+
+ arm,primecell-periphid:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ Value to override the hardware PrimeCell peripheral ID. Ambarella
+ variants use a synthetic ID retaining the PL061 part number because
+ the hardware has no discoverable ID or assigned designer ID.
reg:
maxItems: 1
@@ -57,6 +70,20 @@ properties:
minItems: 1
maxItems: 8
+allOf:
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: ambarella,cv75-gpio
+ then:
+ properties:
+ arm,primecell-periphid:
+ const: 0x00000061
+ required:
+ - arm,primecell-periphid
+ - gpio-ranges
+
required:
- compatible
- reg
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread* [PATCH v5 06/12] dt-bindings: serial: add Ambarella CV75 UART
2026-08-18 10:31 [PATCH v5 00/12] Ambarella CV75 SoC minimal bring-up Long Zhao via B4 Relay
` (4 preceding siblings ...)
2026-08-18 10:31 ` [PATCH v5 05/12] dt-bindings: gpio: pl061: add Ambarella CV75 variant Long Zhao via B4 Relay
@ 2026-08-18 10:31 ` Long Zhao via B4 Relay
2026-08-18 10:31 ` [PATCH v5 07/12] clk: ambarella: add CV75 CCU driver Long Zhao via B4 Relay
` (5 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Long Zhao via B4 Relay @ 2026-08-18 10:31 UTC (permalink / raw)
To: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Michael Turquette,
Stephen Boyd, Linus Walleij, Bartosz Golaszewski,
Greg Kroah-Hartman, Jiri Slaby, Andy Shevchenko, Catalin Marinas,
Will Deacon, devicetree, linux-clk, linux-gpio, linux-serial,
linux-kernel, Brian Masney, Lee Jones, mfd, Long Zhao, Long Zhao
From: Long Zhao <longzhao@ambarella.com>
Document the Ambarella CV75 on-chip UART controller binding for early
console bring-up. The binding requires a single RCT clock input and
fixed 32-bit register access via reg-shift and reg-io-width.
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
.../bindings/serial/ambarella,cv75-uart.yaml | 56 ++++++++++++++++++++++
1 file changed, 56 insertions(+)
diff --git a/Documentation/devicetree/bindings/serial/ambarella,cv75-uart.yaml b/Documentation/devicetree/bindings/serial/ambarella,cv75-uart.yaml
new file mode 100644
index 000000000000..223c84bf460d
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/ambarella,cv75-uart.yaml
@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/serial/ambarella,cv75-uart.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Ambarella CV75 UART
+
+maintainers:
+ - Long Zhao <longzhao@ambarella.com>
+
+allOf:
+ - $ref: serial.yaml#
+
+properties:
+ compatible:
+ const: ambarella,cv75-uart
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ clocks:
+ maxItems: 1
+
+ reg-shift:
+ const: 2
+
+ reg-io-width:
+ const: 4
+
+required:
+ - compatible
+ - reg
+ - interrupts
+ - clocks
+ - reg-shift
+ - reg-io-width
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/clock/ambarella,cv75-rct.h>
+ #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+ serial@e4000000 {
+ compatible = "ambarella,cv75-uart";
+ reg = <0xe4000000 0x1000>;
+ clocks = <&rct CV75_GCLK_UART0>;
+ interrupts = <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>;
+ reg-shift = <2>;
+ reg-io-width = <4>;
+ };
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread* [PATCH v5 07/12] clk: ambarella: add CV75 CCU driver
2026-08-18 10:31 [PATCH v5 00/12] Ambarella CV75 SoC minimal bring-up Long Zhao via B4 Relay
` (5 preceding siblings ...)
2026-08-18 10:31 ` [PATCH v5 06/12] dt-bindings: serial: add Ambarella CV75 UART Long Zhao via B4 Relay
@ 2026-08-18 10:31 ` Long Zhao via B4 Relay
2026-08-18 10:31 ` [PATCH v5 08/12] gpio: pl061: add Ambarella CV75 register layout variant Long Zhao via B4 Relay
` (4 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Long Zhao via B4 Relay @ 2026-08-18 10:31 UTC (permalink / raw)
To: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Michael Turquette,
Stephen Boyd, Linus Walleij, Bartosz Golaszewski,
Greg Kroah-Hartman, Jiri Slaby, Andy Shevchenko, Catalin Marinas,
Will Deacon, devicetree, linux-clk, linux-gpio, linux-serial,
linux-kernel, Brian Masney, Lee Jones, mfd, Long Zhao, Long Zhao
From: Long Zhao <longzhao@ambarella.com>
Add the Ambarella CV75 clock driver covering the core PLL and the
UART0 / AHB / APB clocks needed for early console bring-up.
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
drivers/clk/Kconfig | 1 +
drivers/clk/Makefile | 1 +
drivers/clk/ambarella/Kconfig | 13 ++
drivers/clk/ambarella/Makefile | 6 +
drivers/clk/ambarella/ccu-cv75.c | 296 +++++++++++++++++++++++++
drivers/clk/ambarella/ccu_common.c | 60 +++++
drivers/clk/ambarella/ccu_common.h | 25 +++
drivers/clk/ambarella/ccu_mux_div.c | 234 ++++++++++++++++++++
drivers/clk/ambarella/ccu_mux_div.h | 35 +++
drivers/clk/ambarella/ccu_pll.c | 421 ++++++++++++++++++++++++++++++++++++
drivers/clk/ambarella/ccu_pll.h | 70 ++++++
11 files changed, 1162 insertions(+)
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 1717ce75a907..fbbf4963716c 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -506,6 +506,7 @@ config COMMON_CLK_RPMI
the RISC-V platform management interface (RPMI) specification.
source "drivers/clk/actions/Kconfig"
+source "drivers/clk/ambarella/Kconfig"
source "drivers/clk/analogbits/Kconfig"
source "drivers/clk/aspeed/Kconfig"
source "drivers/clk/bcm/Kconfig"
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index cc108a75a900..30d823ee606f 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -112,6 +112,7 @@ obj-$(CONFIG_COMMON_CLK_XGENE) += clk-xgene.o
# please keep this section sorted lexicographically by directory path name
obj-y += actions/
+obj-y += ambarella/
obj-y += analogbits/
obj-y += aspeed/
obj-$(CONFIG_COMMON_CLK_AT91) += at91/
diff --git a/drivers/clk/ambarella/Kconfig b/drivers/clk/ambarella/Kconfig
new file mode 100644
index 000000000000..d79bb4bd6df5
--- /dev/null
+++ b/drivers/clk/ambarella/Kconfig
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config CLK_AMBARELLA_CV75
+ bool "Ambarella CV75 RCT clock controller"
+ depends on ARCH_AMBARELLA || COMPILE_TEST
+ select CLK_AMBARELLA_CCU
+ default ARCH_AMBARELLA
+ help
+ Say Y to enable the Ambarella CV75 RCT clock controller.
+
+config CLK_AMBARELLA_CCU
+ bool
+ select REGMAP_MMIO
diff --git a/drivers/clk/ambarella/Makefile b/drivers/clk/ambarella/Makefile
new file mode 100644
index 000000000000..36e96326ea97
--- /dev/null
+++ b/drivers/clk/ambarella/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for ambarella specific clk
+#
+
+obj-$(CONFIG_CLK_AMBARELLA_CCU) += ccu_common.o ccu_mux_div.o ccu_pll.o
+obj-$(CONFIG_CLK_AMBARELLA_CV75) += ccu-cv75.o
diff --git a/drivers/clk/ambarella/ccu-cv75.c b/drivers/clk/ambarella/ccu-cv75.c
new file mode 100644
index 000000000000..d682da3cf28d
--- /dev/null
+++ b/drivers/clk/ambarella/ccu-cv75.c
@@ -0,0 +1,296 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2026 Ambarella, Inc.
+ *
+ * CV75 RCT clock controller for boot clocks.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/clock/ambarella,cv75-rct.h>
+
+#include "ccu_common.h"
+#include "ccu_mux_div.h"
+#include "ccu_pll.h"
+
+enum amb_cv75_clk_type {
+ AMB_CV75_CLK_FIXED_RATE,
+ AMB_CV75_CLK_FIXED_FACTOR,
+ AMB_CV75_CLK_PLL,
+ AMB_CV75_CLK_DIV,
+ AMB_CV75_CLK_MUX_DIV,
+};
+
+enum amb_cv75_clk_ref {
+ AMB_CV75_CLK_REF_OSC = -1,
+ AMB_CV75_CLK_REF_DUMMY = -2,
+};
+
+/* PLL version for CV75 (ambarella,clkpll-v1 in vendor DTS) */
+static const struct amb_pll_soc_data cv75_pll_soc_data = {
+ .pll_version = 1,
+ .fsout_mask = CTRL2_FSOUT_DIV2,
+ .fsout_val = CTRL2_FSOUT_DIV2,
+ .fsdiv_mask = CTRL2_FSDIV_DIV2,
+ .fsdiv_val = CTRL2_FSDIV_DIV2,
+ .vcodiv_mask = CTRL2_VCODIV_DIV2,
+ .vcodiv_val = CTRL2_VCODIV_DIV2,
+ .vco_max_mhz = 2600UL,
+ .vco_min_mhz = 850UL,
+ .vco_range = { 1800UL, 1400UL, 1100UL, 0UL },
+};
+
+struct amb_cv75_clk_desc {
+ int id;
+ enum amb_cv75_clk_type type;
+ const char *name;
+ int parent;
+
+ union {
+ struct {
+ unsigned long rate;
+ } fixed_rate;
+ struct {
+ unsigned long flags;
+ unsigned int mult;
+ unsigned int div;
+ } fixed_factor;
+ struct {
+ u32 reg_offset[REG_NUM];
+ const struct amb_pll_soc_data *soc_data;
+ } pll;
+ struct {
+ u32 reg;
+ u32 shift;
+ u32 width;
+ u32 flags;
+ u32 fix_divider;
+ } div;
+ struct amb_mux_div_desc mux_div;
+ };
+};
+
+static const struct amb_cv75_clk_desc cv75_clks[] = {
+ {
+ .id = AMB_CV75_CLK_REF_DUMMY,
+ .type = AMB_CV75_CLK_FIXED_RATE,
+ .name = "dummy",
+ .fixed_rate.rate = 0,
+ },
+ {
+ .id = CV75_GCLK_CORE,
+ .type = AMB_CV75_CLK_PLL,
+ .name = "core",
+ .parent = AMB_CV75_CLK_REF_OSC,
+ .pll = {
+ .reg_offset = {
+ 0x000, 0x004, 0x100,
+ 0x104, 0x000, 0x000,
+ },
+ .soc_data = &cv75_pll_soc_data,
+ },
+ },
+ {
+ .id = CV75_GCLK_AHB,
+ .type = AMB_CV75_CLK_FIXED_FACTOR,
+ .name = "ahb",
+ .parent = CV75_GCLK_CORE,
+ .fixed_factor = {
+ .flags = 0,
+ .mult = 1,
+ .div = 2,
+ },
+ },
+ {
+ .id = CV75_GCLK_APB,
+ .type = AMB_CV75_CLK_FIXED_FACTOR,
+ .name = "apb",
+ .parent = CV75_GCLK_CORE,
+ .fixed_factor = {
+ .flags = 0,
+ .mult = 1,
+ .div = 4,
+ },
+ },
+ {
+ .id = CV75_GCLK_UART0,
+ .type = AMB_CV75_CLK_MUX_DIV,
+ .name = "uart0",
+ .mux_div = {
+ .name = "uart0",
+ .parents = (const int[]) {
+ AMB_CV75_CLK_REF_OSC, CV75_GCLK_CORE,
+ AMB_CV75_CLK_REF_DUMMY, AMB_CV75_CLK_REF_DUMMY,
+ },
+ .num_parents = 4,
+ .mux_reg = 0x1c8,
+ .mux_shift = 0,
+ .mux_mask = 0x3,
+ .div_reg = 0x038,
+ .div_shift = 0,
+ .div_width = 24,
+ .div_flags = CLK_DIVIDER_ONE_BASED,
+ .fix_divider = 1,
+ },
+ },
+};
+
+static struct clk_hw *amb_cv75_get_parent(struct amb_ccu *ccu,
+ struct clk_hw *osc,
+ struct clk_hw *dummy,
+ int parent)
+{
+ if (parent == AMB_CV75_CLK_REF_OSC)
+ return osc;
+ if (parent == AMB_CV75_CLK_REF_DUMMY)
+ return dummy;
+
+ if (parent < 0 || parent >= ccu->data->num)
+ return ERR_PTR(-EINVAL);
+
+ if (!ccu->data->hws[parent])
+ return ERR_PTR(-EPROBE_DEFER);
+
+ return ccu->data->hws[parent];
+}
+
+static struct clk_hw *amb_cv75_register_mux_div(struct device *dev,
+ struct amb_ccu *ccu,
+ const struct amb_cv75_clk_desc *desc,
+ struct clk_hw *osc,
+ struct clk_hw *dummy)
+{
+ const struct amb_mux_div_desc *md = &desc->mux_div;
+ struct clk_parent_data *pdata;
+ struct clk_hw *parent;
+ u8 i;
+
+ pdata = devm_kcalloc(dev, md->num_parents, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = 0; i < md->num_parents; i++) {
+ if (md->parents[i] == AMB_CV75_CLK_REF_OSC) {
+ pdata[i].fw_name = "osc";
+ continue;
+ }
+
+ parent = amb_cv75_get_parent(ccu, osc, dummy, md->parents[i]);
+ if (IS_ERR(parent))
+ return parent;
+
+ pdata[i].hw = parent;
+ }
+
+ return amb_mux_div_register(dev, ccu->map, md, pdata);
+}
+
+static struct clk_hw *amb_cv75_register_clk(struct device *dev,
+ struct amb_ccu *ccu,
+ const struct amb_cv75_clk_desc *desc,
+ struct clk_hw *osc,
+ struct clk_hw *dummy)
+{
+ struct amb_pll_desc pll_desc;
+ struct clk_hw *parent;
+
+ switch (desc->type) {
+ case AMB_CV75_CLK_FIXED_RATE:
+ return devm_clk_hw_register_fixed_rate(dev, desc->name, NULL, 0,
+ desc->fixed_rate.rate);
+ case AMB_CV75_CLK_FIXED_FACTOR:
+ parent = amb_cv75_get_parent(ccu, osc, dummy, desc->parent);
+ if (IS_ERR(parent))
+ return parent;
+
+ return devm_clk_hw_register_fixed_factor_parent_hw(dev,
+ desc->name, parent,
+ desc->fixed_factor.flags,
+ desc->fixed_factor.mult,
+ desc->fixed_factor.div);
+ case AMB_CV75_CLK_PLL:
+ parent = amb_cv75_get_parent(ccu, osc, dummy, desc->parent);
+ if (IS_ERR(parent))
+ return parent;
+
+ pll_desc.name = desc->name;
+ pll_desc.parent = parent;
+ memcpy((void *)pll_desc.reg_offset, desc->pll.reg_offset,
+ sizeof(pll_desc.reg_offset));
+ pll_desc.soc_data = desc->pll.soc_data;
+ pll_desc.frac_mode = false;
+
+ return amb_pll_register(dev, ccu->map, &pll_desc);
+ case AMB_CV75_CLK_DIV:
+ parent = amb_cv75_get_parent(ccu, osc, dummy, desc->parent);
+ if (IS_ERR(parent))
+ return parent;
+
+ return amb_div_register(dev, ccu->map, desc->name, parent,
+ desc->div.reg, desc->div.shift,
+ desc->div.width, desc->div.flags,
+ desc->div.fix_divider);
+ case AMB_CV75_CLK_MUX_DIV:
+ return amb_cv75_register_mux_div(dev, ccu, desc, osc, dummy);
+ default:
+ return ERR_PTR(-EINVAL);
+ }
+}
+
+static int amb_cv75_rct_probe(struct platform_device *pdev)
+{
+ struct amb_ccu *ccu;
+ struct clk *osc_clk;
+ struct clk_hw *osc, *dummy = NULL, *hw;
+ int i;
+
+ ccu = amb_ccu_init(pdev, ARRAY_SIZE(cv75_clks));
+ if (IS_ERR(ccu))
+ return PTR_ERR(ccu);
+
+ osc_clk = devm_clk_get(&pdev->dev, "osc");
+ if (IS_ERR(osc_clk))
+ return dev_err_probe(&pdev->dev, PTR_ERR(osc_clk),
+ "missing osc clock\n");
+ osc = __clk_get_hw(osc_clk);
+
+ for (i = 0; i < ARRAY_SIZE(cv75_clks); i++) {
+ hw = amb_cv75_register_clk(&pdev->dev, ccu, &cv75_clks[i],
+ osc, dummy);
+ if (IS_ERR(hw))
+ return dev_err_probe(&pdev->dev, PTR_ERR(hw),
+ "failed to register %s\n",
+ cv75_clks[i].name);
+
+ if (cv75_clks[i].id == AMB_CV75_CLK_REF_DUMMY)
+ dummy = hw;
+ else
+ ccu->data->hws[cv75_clks[i].id] = hw;
+ }
+
+ return amb_ccu_register(ccu);
+}
+
+static const struct of_device_id amb_cv75_rct_match[] = {
+ { .compatible = "ambarella,cv75-rct" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, amb_cv75_rct_match);
+
+static struct platform_driver amb_cv75_rct_driver = {
+ .probe = amb_cv75_rct_probe,
+ .driver = {
+ .name = "ambarella-cv75-rct",
+ .of_match_table = amb_cv75_rct_match,
+ },
+};
+module_platform_driver(amb_cv75_rct_driver);
+
+MODULE_AUTHOR("Ambarella Inc.");
+MODULE_DESCRIPTION("Ambarella CV75 RCT clock controller");
+MODULE_LICENSE("GPL");
diff --git a/drivers/clk/ambarella/ccu_common.c b/drivers/clk/ambarella/ccu_common.c
new file mode 100644
index 000000000000..78587c5f2ce1
--- /dev/null
+++ b/drivers/clk/ambarella/ccu_common.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2026 Ambarella, Inc.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include "ccu_common.h"
+
+static const struct regmap_config amb_rct_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = AMB_RCT_REG_SIZE - 4,
+};
+
+struct amb_ccu *amb_ccu_init(struct platform_device *pdev,
+ unsigned int num_clks)
+{
+ struct amb_ccu *ccu;
+ void __iomem *base;
+
+ if (!num_clks)
+ return ERR_PTR(-EINVAL);
+
+ ccu = devm_kzalloc(&pdev->dev, sizeof(*ccu), GFP_KERNEL);
+ if (!ccu)
+ return ERR_PTR(-ENOMEM);
+
+ ccu->dev = &pdev->dev;
+
+ ccu->data = devm_kzalloc(&pdev->dev,
+ struct_size(ccu->data, hws, num_clks),
+ GFP_KERNEL);
+ if (!ccu->data)
+ return ERR_PTR(-ENOMEM);
+
+ ccu->data->num = num_clks;
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base))
+ return ERR_CAST(base);
+
+ ccu->map = devm_regmap_init_mmio(&pdev->dev, base,
+ &amb_rct_regmap_config);
+ if (IS_ERR(ccu->map))
+ return ERR_CAST(ccu->map);
+
+ return ccu;
+}
+
+int amb_ccu_register(struct amb_ccu *ccu)
+{
+ return devm_of_clk_add_hw_provider(ccu->dev, of_clk_hw_onecell_get,
+ ccu->data);
+}
diff --git a/drivers/clk/ambarella/ccu_common.h b/drivers/clk/ambarella/ccu_common.h
new file mode 100644
index 000000000000..f2bf9d1f06d7
--- /dev/null
+++ b/drivers/clk/ambarella/ccu_common.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2026 Ambarella, Inc.
+ */
+
+#ifndef __CCU_COMMON_H
+#define __CCU_COMMON_H
+
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+
+#define AMB_RCT_REG_SIZE 0x1000
+
+struct amb_ccu {
+ struct device *dev;
+ struct regmap *map;
+ struct clk_hw_onecell_data *data;
+};
+
+struct amb_ccu *amb_ccu_init(struct platform_device *pdev,
+ unsigned int num_clks);
+int amb_ccu_register(struct amb_ccu *ccu);
+
+#endif
diff --git a/drivers/clk/ambarella/ccu_mux_div.c b/drivers/clk/ambarella/ccu_mux_div.c
new file mode 100644
index 000000000000..d5259bc347e4
--- /dev/null
+++ b/drivers/clk/ambarella/ccu_mux_div.c
@@ -0,0 +1,234 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2026 Ambarella, Inc.
+ *
+ * Regmap-backed mux + divider, derived from the vendor composite-clock driver.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/math64.h>
+#include <linux/regmap.h>
+
+#include "ccu_mux_div.h"
+
+struct amb_mux {
+ struct clk_hw hw;
+ struct regmap *map;
+ u32 offset;
+ u32 mask;
+ u32 shift;
+};
+
+struct amb_div {
+ struct clk_hw hw;
+ struct regmap *map;
+ u32 offset;
+ u32 shift;
+ u32 width;
+ u32 flags;
+ u32 fix_divider;
+};
+
+#define to_amb_mux(_hw) container_of(_hw, struct amb_mux, hw)
+#define to_amb_div(_hw) container_of(_hw, struct amb_div, hw)
+
+static u8 amb_mux_get_parent(struct clk_hw *hw)
+{
+ struct amb_mux *mux = to_amb_mux(hw);
+ u32 val;
+
+ regmap_read(mux->map, mux->offset, &val);
+ val >>= mux->shift;
+ val &= mux->mask;
+
+ return val;
+}
+
+static int amb_mux_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct amb_mux *mux = to_amb_mux(hw);
+
+ return regmap_update_bits(mux->map, mux->offset,
+ mux->mask << mux->shift,
+ index << mux->shift);
+}
+
+static const struct clk_ops amb_mux_ops = {
+ .get_parent = amb_mux_get_parent,
+ .set_parent = amb_mux_set_parent,
+};
+
+static unsigned long amb_div_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct amb_div *div = to_amb_div(hw);
+ unsigned long rate;
+ u32 val;
+
+ regmap_read(div->map, div->offset, &val);
+
+ /* Divider reset/disable bit sits above the field at shift+width. */
+ if (val & (BIT(div->width) << div->shift))
+ return 0;
+
+ val >>= div->shift;
+ val &= clk_div_mask(div->width);
+
+ rate = divider_recalc_rate(hw, parent_rate, val, NULL,
+ div->flags, div->width);
+ if (div->fix_divider)
+ rate = div_u64(rate, div->fix_divider);
+
+ return rate;
+}
+
+static int amb_div_determine_rate(struct clk_hw *hw,
+ struct clk_rate_request *req)
+{
+ struct amb_div *div = to_amb_div(hw);
+ struct clk_rate_request scaled = *req;
+ int ret;
+
+ if (!req->rate && (div->flags & CLK_DIVIDER_ONE_BASED))
+ return 0;
+
+ if (div->fix_divider) {
+ scaled.rate = min(req->rate,
+ ULONG_MAX / div->fix_divider) *
+ div->fix_divider;
+ scaled.min_rate = min(req->min_rate,
+ ULONG_MAX / div->fix_divider) *
+ div->fix_divider;
+ scaled.max_rate = min(req->max_rate,
+ ULONG_MAX / div->fix_divider) *
+ div->fix_divider;
+ }
+
+ ret = divider_determine_rate(hw, &scaled, NULL, div->width,
+ div->flags);
+ if (ret)
+ return ret;
+
+ req->rate = scaled.rate;
+ req->best_parent_rate = scaled.best_parent_rate;
+ req->best_parent_hw = scaled.best_parent_hw;
+ if (div->fix_divider)
+ req->rate = div_u64(req->rate, div->fix_divider);
+
+ return 0;
+}
+
+static int amb_div_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct amb_div *div = to_amb_div(hw);
+ int val, mask;
+
+ if (div->fix_divider)
+ rate *= div->fix_divider;
+
+ if (!rate) {
+ /* Assert the reset/disable bit above the divider field. */
+ val = BIT(div->width);
+ mask = clk_div_mask(div->width + 1);
+ } else {
+ val = divider_get_val(rate, parent_rate, NULL,
+ div->width, div->flags);
+ if (val < 0)
+ return val;
+
+ /*
+ * Include the disable bit in the mask so a later non-zero
+ * set_rate clears a previous rate==0 disable assert.
+ */
+ mask = clk_div_mask(div->width + 1);
+ }
+
+ regmap_update_bits(div->map, div->offset, mask << div->shift,
+ val << div->shift);
+
+ /*
+ * Non-ONE_BASED dividers use bit 0 as a write-enable strobe. Skip the
+ * pulse when shift == 0 so we do not corrupt the divider field itself.
+ */
+ if (!(div->flags & CLK_DIVIDER_ONE_BASED) && div->shift) {
+ regmap_update_bits(div->map, div->offset, BIT(0), BIT(0));
+ regmap_update_bits(div->map, div->offset, BIT(0), 0);
+ }
+
+ return 0;
+}
+
+static const struct clk_ops amb_div_ops = {
+ .recalc_rate = amb_div_recalc_rate,
+ .determine_rate = amb_div_determine_rate,
+ .set_rate = amb_div_set_rate,
+};
+
+struct clk_hw *amb_div_register(struct device *dev, struct regmap *map,
+ const char *name, const struct clk_hw *parent,
+ u32 div_reg, u32 div_shift, u32 div_width,
+ u32 div_flags, u32 fix_divider)
+{
+ struct amb_div *div;
+ struct clk_init_data init = {};
+ int ret;
+
+ div = devm_kzalloc(dev, sizeof(*div), GFP_KERNEL);
+ if (!div)
+ return ERR_PTR(-ENOMEM);
+
+ div->map = map;
+ div->offset = div_reg;
+ div->shift = div_shift;
+ div->width = div_width;
+ div->flags = div_flags;
+ div->fix_divider = fix_divider;
+
+ init.name = name;
+ init.ops = &amb_div_ops;
+ init.parent_hws = &parent;
+ init.num_parents = 1;
+
+ div->hw.init = &init;
+
+ ret = devm_clk_hw_register(dev, &div->hw);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return &div->hw;
+}
+
+struct clk_hw *amb_mux_div_register(struct device *dev, struct regmap *map,
+ const struct amb_mux_div_desc *desc,
+ const struct clk_parent_data *parent_data)
+{
+ struct amb_mux *mux;
+ struct amb_div *div;
+
+ mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
+ div = devm_kzalloc(dev, sizeof(*div), GFP_KERNEL);
+ if (!mux || !div)
+ return ERR_PTR(-ENOMEM);
+
+ mux->map = map;
+ mux->offset = desc->mux_reg;
+ mux->shift = desc->mux_shift;
+ mux->mask = desc->mux_mask;
+
+ div->map = map;
+ div->offset = desc->div_reg;
+ div->shift = desc->div_shift;
+ div->width = desc->div_width;
+ div->flags = desc->div_flags;
+ div->fix_divider = desc->fix_divider;
+
+ return devm_clk_hw_register_composite_pdata(dev, desc->name,
+ parent_data,
+ desc->num_parents,
+ &mux->hw, &amb_mux_ops,
+ &div->hw, &amb_div_ops,
+ NULL, NULL,
+ CLK_SET_RATE_NO_REPARENT);
+}
diff --git a/drivers/clk/ambarella/ccu_mux_div.h b/drivers/clk/ambarella/ccu_mux_div.h
new file mode 100644
index 000000000000..abaefff1201a
--- /dev/null
+++ b/drivers/clk/ambarella/ccu_mux_div.h
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2026 Ambarella, Inc.
+ */
+
+#ifndef __CCU_MUX_DIV_H
+#define __CCU_MUX_DIV_H
+
+#include <linux/clk-provider.h>
+#include <linux/regmap.h>
+
+struct amb_mux_div_desc {
+ const char *name;
+ const int *parents;
+ u8 num_parents;
+ u32 mux_reg;
+ u32 mux_shift;
+ u32 mux_mask;
+ u32 div_reg;
+ u32 div_shift;
+ u32 div_width;
+ u32 div_flags;
+ u32 fix_divider;
+};
+
+struct clk_hw *amb_mux_div_register(struct device *dev, struct regmap *map,
+ const struct amb_mux_div_desc *desc,
+ const struct clk_parent_data *parent_data);
+
+struct clk_hw *amb_div_register(struct device *dev, struct regmap *map,
+ const char *name, const struct clk_hw *parent,
+ u32 div_reg, u32 div_shift, u32 div_width,
+ u32 div_flags, u32 fix_divider);
+
+#endif
diff --git a/drivers/clk/ambarella/ccu_pll.c b/drivers/clk/ambarella/ccu_pll.c
new file mode 100644
index 000000000000..76452003bb0d
--- /dev/null
+++ b/drivers/clk/ambarella/ccu_pll.c
@@ -0,0 +1,421 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2026 Ambarella, Inc.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/math64.h>
+#include <linux/rational.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include "ccu_pll.h"
+
+#define AMB_PLL_MAX_SOUT 16UL
+#define AMB_PLL_MAX_SDIV 16UL
+
+struct amb_pll {
+ struct clk_hw hw;
+ struct regmap *map;
+ u32 reg_offset[REG_NUM];
+ const struct amb_pll_soc_data *soc_data;
+ u32 fix_divider;
+ bool frac_mode;
+};
+
+#define to_amb_pll(_hw) container_of(_hw, struct amb_pll, hw)
+
+static void amb_pll_write_enable(struct regmap *map, u32 offset, u32 val)
+{
+ regmap_write(map, offset, val);
+ regmap_write(map, offset, val | CTRL_WRITE_ENABLE);
+ regmap_write(map, offset, val);
+}
+
+static unsigned long amb_pll_calc_vco(struct amb_pll *pll,
+ unsigned long parent_rate)
+{
+ const struct amb_pll_soc_data *soc_data = pll->soc_data;
+ u32 *reg = pll->reg_offset;
+ u32 pre_scaler = 1;
+ u32 ctrl_val, ctrl2_val = 0, frac_val;
+ u32 intp, sdiv, vcodiv, fsdiv;
+ u64 frac = 0, vco;
+
+ if (reg[PRES_OFFSET]) {
+ regmap_read(pll->map, reg[PRES_OFFSET], &pre_scaler);
+ pre_scaler = (pre_scaler >> 4) + 1;
+ }
+
+ regmap_read(pll->map, reg[CTRL_OFFSET], &ctrl_val);
+ intp = ((ctrl_val >> 24) & 0x7f) + 1;
+ sdiv = ((ctrl_val >> 12) & 0xf) + 1;
+
+ if (soc_data->pll_version >= 2) {
+ vcodiv = (ctrl_val & soc_data->vcodiv_mask) ==
+ soc_data->vcodiv_val ? 2 : 1;
+ fsdiv = (ctrl_val & soc_data->fsdiv_mask) ==
+ soc_data->fsdiv_val ? 2 : 1;
+ } else {
+ regmap_read(pll->map, reg[CTRL2_OFFSET], &ctrl2_val);
+ vcodiv = (ctrl2_val & soc_data->vcodiv_mask) ==
+ soc_data->vcodiv_val ? 2 : 1;
+ fsdiv = (ctrl2_val & soc_data->fsdiv_mask) ==
+ soc_data->fsdiv_val ? 2 : 1;
+ }
+
+ vco = (u64)parent_rate * vcodiv * fsdiv * intp * sdiv;
+ vco = div_u64(vco, pre_scaler);
+
+ if (ctrl_val & CTRL_FRAC_MODE) {
+ regmap_read(pll->map, reg[FRAC_OFFSET], &frac_val);
+ frac = (u64)parent_rate * vcodiv * fsdiv * sdiv * frac_val;
+ frac = div_u64(frac, pre_scaler) >> 32;
+ }
+
+ return vco + frac;
+}
+
+static unsigned long amb_pll_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct amb_pll *pll = to_amb_pll(hw);
+ const struct amb_pll_soc_data *soc_data = pll->soc_data;
+ u32 *reg = pll->reg_offset;
+ u32 pre_scaler = 1, post_scaler = 1;
+ u32 ctrl_val, ctrl2_val = 0;
+ u32 vcodiv, fsout, sout;
+ u64 rate;
+
+ regmap_read(pll->map, reg[CTRL_OFFSET], &ctrl_val);
+ if (ctrl_val & (CTRL_POWER_DOWN | CTRL_HALT_VCO | CTRL_FORCE_RESET))
+ return 0;
+
+ if (reg[PRES_OFFSET]) {
+ regmap_read(pll->map, reg[PRES_OFFSET], &pre_scaler);
+ pre_scaler = (pre_scaler >> 4) + 1;
+ }
+
+ if (reg[POST_OFFSET]) {
+ regmap_read(pll->map, reg[POST_OFFSET], &post_scaler);
+ post_scaler = (post_scaler >> 4) + 1;
+ }
+
+ if (ctrl_val & CTRL_BYPASS)
+ return parent_rate / pre_scaler / post_scaler;
+
+ if (soc_data->pll_version >= 2) {
+ vcodiv = (ctrl_val & soc_data->vcodiv_mask) ==
+ soc_data->vcodiv_val ? 2 : 1;
+ fsout = (ctrl_val & soc_data->fsout_mask) ==
+ soc_data->fsout_val ? 2 : 1;
+ } else {
+ regmap_read(pll->map, reg[CTRL2_OFFSET], &ctrl2_val);
+ vcodiv = (ctrl2_val & soc_data->vcodiv_mask) ==
+ soc_data->vcodiv_val ? 2 : 1;
+ fsout = (ctrl2_val & soc_data->fsout_mask) ==
+ soc_data->fsout_val ? 2 : 1;
+ }
+
+ sout = ((ctrl_val >> 16) & 0xf) + 1;
+ rate = amb_pll_calc_vco(pll, parent_rate);
+
+ if (soc_data->pll_version >= 2) {
+ if (!(ctrl_val & CTRL_BYPASS_HSDIV))
+ rate = div_u64(rate, vcodiv * fsout * sout);
+ } else {
+ if (!(ctrl2_val & CTRL2_BYPASS_HSDIV))
+ rate = div_u64(rate, vcodiv * fsout * sout);
+ }
+
+ rate = div_u64(rate, pll->fix_divider * post_scaler);
+
+ return rate;
+}
+
+static int amb_pll_calc_params(struct amb_pll *pll, unsigned long rate,
+ unsigned long parent_rate, u32 ctrl2_val,
+ u32 *intp, u32 *sdiv, u32 *sout,
+ u32 *vcodiv, u32 *fsdiv, u32 *fsout)
+{
+ const struct amb_pll_soc_data *soc_data = pll->soc_data;
+ unsigned long max_numerator, max_denominator;
+ unsigned long intp_ul, sout_ul, rate_tmp, parent_scaled;
+ u32 ctrl_val;
+
+ if (!parent_rate)
+ return -EINVAL;
+
+ *sdiv = 1;
+
+ if (soc_data->pll_version >= 2) {
+ ctrl_val = 0;
+ *vcodiv = (ctrl_val & soc_data->vcodiv_mask) ==
+ soc_data->vcodiv_val ? 2 : 1;
+ *fsdiv = (ctrl_val & soc_data->fsdiv_mask) ==
+ soc_data->fsdiv_val ? 2 : 1;
+ *fsout = (ctrl_val & soc_data->fsout_mask) ==
+ soc_data->fsout_val ? 2 : 1;
+ } else {
+ *vcodiv = (ctrl2_val & soc_data->vcodiv_mask) ==
+ soc_data->vcodiv_val ? 2 : 1;
+ *fsdiv = (ctrl2_val & soc_data->fsdiv_mask) ==
+ soc_data->fsdiv_val ? 2 : 1;
+ *fsout = (ctrl2_val & soc_data->fsout_mask) ==
+ soc_data->fsout_val ? 2 : 1;
+ }
+
+ if (rate < parent_rate)
+ return -EINVAL;
+
+ max_numerator = soc_data->vco_max_mhz;
+ max_numerator = div_u64(max_numerator * 1000000ULL, parent_rate);
+ max_numerator = div_u64(max_numerator, *vcodiv * *fsdiv);
+ max_numerator = min(128UL, max_numerator);
+ if (!max_numerator)
+ return -EINVAL;
+
+ /*
+ * Approximate intp/sout against the fsdiv/fsout-scaled parent so the
+ * initial guess matches the hardware frequency equation.
+ */
+ max_denominator = AMB_PLL_MAX_SOUT;
+ parent_scaled = parent_rate * *fsdiv / *fsout;
+ if (!parent_scaled)
+ return -EINVAL;
+ rate_tmp = rate;
+ rational_best_approximation(rate_tmp, parent_scaled, max_numerator,
+ max_denominator, &intp_ul, &sout_ul);
+
+ while (parent_rate * *fsdiv * intp_ul * *sdiv / *fsout / sout_ul >
+ rate) {
+ unsigned long resolution = parent_scaled / AMB_PLL_MAX_SOUT;
+
+ /* Avoid an infinite loop when parent_rate < AMB_PLL_MAX_SOUT. */
+ if (!resolution)
+ resolution = 1;
+
+ if (rate_tmp <= resolution)
+ return -EINVAL;
+
+ rate_tmp -= resolution;
+ rational_best_approximation(rate_tmp, parent_scaled,
+ max_numerator, max_denominator,
+ &intp_ul, &sout_ul);
+ }
+
+ while (parent_rate / 1000000 * *vcodiv * *fsdiv * intp_ul * *sdiv <
+ soc_data->vco_min_mhz) {
+ if (sout_ul > 8 || intp_ul > 64)
+ break;
+
+ intp_ul *= 2;
+ sout_ul *= 2;
+ }
+
+ if (intp_ul > max_numerator || sout_ul > max_denominator ||
+ *sdiv > AMB_PLL_MAX_SDIV)
+ return -EINVAL;
+
+ *intp = intp_ul;
+ *sout = sout_ul;
+
+ return 0;
+}
+
+static int amb_pll_determine_rate(struct clk_hw *hw,
+ struct clk_rate_request *req)
+{
+ struct amb_pll *pll = to_amb_pll(hw);
+ const struct amb_pll_soc_data *soc_data = pll->soc_data;
+ u32 ctrl2_val = 0;
+ u32 intp, sdiv, sout, vcodiv, fsdiv, fsout;
+ unsigned long rate;
+ u64 rounded;
+ int ret;
+
+ if (!req->best_parent_rate)
+ return -EINVAL;
+
+ if (!req->rate || pll->frac_mode)
+ return 0;
+
+ if (req->rate > ULONG_MAX / pll->fix_divider)
+ return -ERANGE;
+
+ rate = req->rate * pll->fix_divider;
+ if (soc_data->ctrl2_val)
+ ctrl2_val = soc_data->ctrl2_val;
+ else
+ regmap_read(pll->map, pll->reg_offset[CTRL2_OFFSET],
+ &ctrl2_val);
+
+ ret = amb_pll_calc_params(pll, rate, req->best_parent_rate,
+ ctrl2_val, &intp, &sdiv, &sout, &vcodiv,
+ &fsdiv, &fsout);
+ if (ret)
+ return ret;
+
+ rounded = (u64)req->best_parent_rate * fsdiv * intp * sdiv;
+ rounded = div64_u64(rounded, (u64)fsout * sout);
+ rounded = div64_u64(rounded, pll->fix_divider);
+ if (rounded < req->min_rate || rounded > req->max_rate)
+ return -EINVAL;
+
+ req->rate = rounded;
+
+ return 0;
+}
+
+static int amb_pll_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct amb_pll *pll = to_amb_pll(hw);
+ const struct amb_pll_soc_data *soc_data = pll->soc_data;
+ u32 *reg = pll->reg_offset;
+ u32 ctrl_val, ctrl2_val = 0, ctrl3_val, frac_val = 0;
+ u32 intp, sdiv, sout, vcodiv, fsdiv, fsout;
+ unsigned long old_rate, new_rate, rate_tmp;
+ int ret;
+
+ if (!rate) {
+ regmap_read(pll->map, reg[CTRL_OFFSET], &ctrl_val);
+ ctrl_val |= CTRL_POWER_DOWN | CTRL_HALT_VCO;
+ amb_pll_write_enable(pll->map, reg[CTRL_OFFSET], ctrl_val);
+ return 0;
+ }
+
+ if (!parent_rate)
+ return -EINVAL;
+
+ rate *= pll->fix_divider;
+
+ if (soc_data->ctrl2_val)
+ ctrl2_val = soc_data->ctrl2_val;
+ else
+ regmap_read(pll->map, reg[CTRL2_OFFSET], &ctrl2_val);
+
+ ret = amb_pll_calc_params(pll, rate, parent_rate, ctrl2_val,
+ &intp, &sdiv, &sout, &vcodiv, &fsdiv,
+ &fsout);
+ if (ret)
+ return ret;
+
+ if (soc_data->ctrl2_val)
+ regmap_write(pll->map, reg[CTRL2_OFFSET], soc_data->ctrl2_val);
+
+ ctrl_val = ((intp - 1) & 0x7f) << 24;
+ ctrl_val |= ((sdiv - 1) & 0xf) << 12;
+ ctrl_val |= ((sout - 1) & 0xf) << 16;
+ if (soc_data->pll_version >= 2) {
+ ctrl_val |= vcodiv == 2 ? soc_data->vcodiv_val : 0;
+ ctrl_val |= fsdiv == 2 ? soc_data->fsdiv_val : 0;
+ ctrl_val |= fsout == 2 ? soc_data->fsout_val : 0;
+ }
+
+ regmap_write(pll->map, reg[CTRL_OFFSET], ctrl_val);
+ regmap_write(pll->map, reg[FRAC_OFFSET], 0);
+
+ old_rate = amb_pll_recalc_rate(hw, parent_rate) * pll->fix_divider;
+ rate_tmp = old_rate > rate ? 0 : rate - old_rate;
+ if (rate_tmp && pll->frac_mode) {
+ u64 dividend, divider;
+
+ dividend = (u64)rate_tmp * sout * fsout;
+ dividend <<= 32;
+ divider = (u64)sdiv * fsdiv * parent_rate;
+ frac_val = DIV64_U64_ROUND_CLOSEST(dividend, divider);
+ regmap_write(pll->map, reg[FRAC_OFFSET], frac_val);
+ ctrl_val |= CTRL_FRAC_MODE;
+ }
+
+ if (soc_data->pll_version >= 2) {
+ ctrl3_val = soc_data->ctrl3_val;
+ regmap_write(pll->map, reg[CTRL3_OFFSET],
+ ctrl3_val | CTRL3_VCO_CLAMP);
+ regmap_write(pll->map, reg[CTRL_OFFSET],
+ ctrl_val | CTRL_FORCE_RESET);
+ ndelay(100);
+ regmap_write(pll->map, reg[CTRL_OFFSET],
+ ctrl_val & ~CTRL_FORCE_RESET);
+ ndelay(100);
+ regmap_write(pll->map, reg[CTRL3_OFFSET],
+ ctrl3_val & ~CTRL3_VCO_CLAMP);
+ } else {
+ u32 fvco_mhz, range;
+
+ fvco_mhz = amb_pll_calc_vco(pll, parent_rate) / 1000000UL;
+ for (range = 0; range < ARRAY_SIZE(soc_data->vco_range);
+ range++) {
+ if (fvco_mhz > soc_data->vco_range[range])
+ break;
+ }
+ if (range == ARRAY_SIZE(soc_data->vco_range))
+ range = 0;
+ else
+ range = ARRAY_SIZE(soc_data->vco_range) - range - 1;
+
+ regmap_read(pll->map, reg[CTRL3_OFFSET], &ctrl3_val);
+ ctrl3_val &= ~CTRL3_VCO_RANGE_MASK;
+ ctrl3_val |= range << 1;
+ regmap_write(pll->map, reg[CTRL3_OFFSET], ctrl3_val);
+
+ if (frac_val) {
+ ctrl_val |= CTRL_FORCE_RESET;
+ amb_pll_write_enable(pll->map, reg[CTRL_OFFSET],
+ ctrl_val);
+ }
+
+ ctrl_val &= ~CTRL_FORCE_RESET;
+ amb_pll_write_enable(pll->map, reg[CTRL_OFFSET], ctrl_val);
+ }
+
+ new_rate = amb_pll_recalc_rate(hw, parent_rate);
+ rate_tmp = rate / pll->fix_divider;
+ if (max(new_rate, rate_tmp) - min(new_rate, rate_tmp) > 10)
+ pr_warn("%s: requested %lu, got %lu\n", clk_hw_get_name(hw),
+ rate_tmp, new_rate);
+
+ return 0;
+}
+
+static const struct clk_ops amb_pll_ops = {
+ .recalc_rate = amb_pll_recalc_rate,
+ .determine_rate = amb_pll_determine_rate,
+ .set_rate = amb_pll_set_rate,
+};
+
+struct clk_hw *amb_pll_register(struct device *dev, struct regmap *map,
+ const struct amb_pll_desc *desc)
+{
+ struct amb_pll *pll;
+ struct clk_init_data init = {};
+ const struct clk_hw *parent = desc->parent;
+ int ret;
+
+ pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
+ if (!pll)
+ return ERR_PTR(-ENOMEM);
+
+ pll->map = map;
+ memcpy(pll->reg_offset, desc->reg_offset, sizeof(pll->reg_offset));
+ pll->soc_data = desc->soc_data;
+ pll->fix_divider = 1;
+ pll->frac_mode = desc->frac_mode;
+
+ init.name = desc->name;
+ init.ops = &amb_pll_ops;
+ init.flags = CLK_GET_RATE_NOCACHE | CLK_IS_CRITICAL;
+ init.parent_hws = &parent;
+ init.num_parents = 1;
+
+ pll->hw.init = &init;
+
+ ret = devm_clk_hw_register(dev, &pll->hw);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return &pll->hw;
+}
diff --git a/drivers/clk/ambarella/ccu_pll.h b/drivers/clk/ambarella/ccu_pll.h
new file mode 100644
index 000000000000..b9e453e9debf
--- /dev/null
+++ b/drivers/clk/ambarella/ccu_pll.h
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2026 Ambarella, Inc.
+ */
+
+#ifndef __CCU_PLL_H
+#define __CCU_PLL_H
+
+#include <linux/bits.h>
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+
+enum {
+ CTRL_OFFSET = 0,
+ FRAC_OFFSET,
+ CTRL2_OFFSET,
+ CTRL3_OFFSET,
+ PRES_OFFSET,
+ POST_OFFSET,
+ REG_NUM,
+};
+
+#define CTRL_BYPASS BIT(2)
+#define CTRL_WRITE_ENABLE BIT(0)
+#define CTRL_FRAC_MODE BIT(3)
+#define CTRL_FORCE_RESET BIT(4)
+#define CTRL_POWER_DOWN BIT(5)
+#define CTRL_HALT_VCO BIT(6)
+#define CTRL_VCODIV_DIV2 BIT(8)
+#define CTRL_FSDIV_DIV2 BIT(9)
+#define CTRL_FSOUT_DIV2 BIT(10)
+#define CTRL_BYPASS_HSDIV BIT(11)
+
+#define CTRL2_VCODIV_DIV2 BIT(8)
+#define CTRL2_FSDIV_DIV2 BIT(9)
+#define CTRL2_FSOUT_DIV2 BIT(11)
+#define CTRL2_BYPASS_HSDIV BIT(12)
+
+#define CTRL3_VCO_RANGE_MASK 0x6
+#define CTRL3_VCO_CLAMP 0x8
+
+struct amb_pll_soc_data {
+ u32 pll_version;
+ u32 fsout_mask;
+ u32 fsout_val;
+ u32 fsdiv_mask;
+ u32 fsdiv_val;
+ u32 vcodiv_mask;
+ u32 vcodiv_val;
+ u32 vco_max_mhz;
+ u32 vco_min_mhz;
+ u32 vco_range[4];
+ u32 ctrl2_val;
+ u32 ctrl3_val;
+};
+
+struct amb_pll_desc {
+ const char *name;
+ const struct clk_hw *parent;
+ const u32 reg_offset[REG_NUM];
+ const struct amb_pll_soc_data *soc_data;
+ bool frac_mode;
+};
+
+struct clk_hw *amb_pll_register(struct device *dev, struct regmap *map,
+ const struct amb_pll_desc *desc);
+
+#endif
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread* [PATCH v5 08/12] gpio: pl061: add Ambarella CV75 register layout variant
2026-08-18 10:31 [PATCH v5 00/12] Ambarella CV75 SoC minimal bring-up Long Zhao via B4 Relay
` (6 preceding siblings ...)
2026-08-18 10:31 ` [PATCH v5 07/12] clk: ambarella: add CV75 CCU driver Long Zhao via B4 Relay
@ 2026-08-18 10:31 ` Long Zhao via B4 Relay
2026-08-18 14:11 ` Andy Shevchenko
2026-08-18 10:31 ` [PATCH v5 09/12] pinctrl: ambarella: add CV75 pin controller Long Zhao via B4 Relay
` (3 subsequent siblings)
11 siblings, 1 reply; 15+ messages in thread
From: Long Zhao via B4 Relay @ 2026-08-18 10:31 UTC (permalink / raw)
To: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Michael Turquette,
Stephen Boyd, Linus Walleij, Bartosz Golaszewski,
Greg Kroah-Hartman, Jiri Slaby, Andy Shevchenko, Catalin Marinas,
Will Deacon, devicetree, linux-clk, linux-gpio, linux-serial,
linux-kernel, Brian Masney, Lee Jones, mfd, Long Zhao, Long Zhao
From: Long Zhao <longzhao@ambarella.com>
Extend gpio-pl061 with a per-variant register layout so the Ambarella
CV75 GPIO banks can reuse the PL061 driver instead of a duplicate.
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
drivers/gpio/gpio-pl061.c | 314 ++++++++++++++++++++++++++++++++++++----------
1 file changed, 246 insertions(+), 68 deletions(-)
diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
index 919cf86fd590..7002ddbc9713 100644
--- a/drivers/gpio/gpio-pl061.c
+++ b/drivers/gpio/gpio-pl061.c
@@ -26,41 +26,107 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
-#define GPIODIR 0x400
-#define GPIOIS 0x404
-#define GPIOIBE 0x408
-#define GPIOIEV 0x40C
-#define GPIOIE 0x410
-#define GPIORIS 0x414
-#define GPIOMIS 0x418
-#define GPIOIC 0x41C
-
#define PL061_GPIO_NR 8
+#define PL061_REG_NONE U32_MAX
+#define PL061_AMBARELLA_PERIPH_ID 0x00000061
+
+struct pl061_variant_data {
+ u32 data;
+ u32 dir;
+ u32 is;
+ u32 ibe;
+ u32 iev;
+ u32 ie;
+ u32 ris;
+ u32 mis;
+ u32 ic;
+ u32 afsel;
+ u32 mask;
+ u32 enable;
+ unsigned int ngpio;
+ bool access_32bit;
+ bool masked_data_address;
+ bool write_data_after_dir;
+ bool clear_irq_on_type;
+};
struct pl061_context_save_regs {
- u8 gpio_data;
- u8 gpio_dir;
- u8 gpio_is;
- u8 gpio_ibe;
- u8 gpio_iev;
- u8 gpio_ie;
+ u32 gpio_data;
+ u32 gpio_dir;
+ u32 gpio_is;
+ u32 gpio_ibe;
+ u32 gpio_iev;
+ u32 gpio_ie;
+ u32 gpio_afsel;
+ u32 gpio_mask;
};
struct pl061 {
raw_spinlock_t lock;
void __iomem *base;
+ const struct pl061_variant_data *variant;
struct gpio_chip gc;
int parent_irq;
struct pl061_context_save_regs csave_regs;
};
+static u32 pl061_read(struct pl061 *pl061, u32 offset)
+{
+ if (pl061->variant->access_32bit)
+ return readl_relaxed(pl061->base + offset);
+
+ return readb_relaxed(pl061->base + offset);
+}
+
+static void pl061_write(struct pl061 *pl061, u32 value, u32 offset)
+{
+ if (pl061->variant->access_32bit)
+ writel_relaxed(value, pl061->base + offset);
+ else
+ writeb_relaxed(value, pl061->base + offset);
+}
+
+static int pl061_get_data(struct pl061 *pl061, unsigned int offset)
+{
+ if (pl061->variant->masked_data_address)
+ return !!readb_relaxed(pl061->base + BIT(offset + 2));
+
+ pl061_write(pl061, BIT(offset), pl061->variant->mask);
+ return !!(pl061_read(pl061, pl061->variant->data) & BIT(offset));
+}
+
+static void pl061_set_data(struct pl061 *pl061, unsigned int offset, int value)
+{
+ if (pl061->variant->masked_data_address) {
+ writeb_relaxed(!!value << offset,
+ pl061->base + BIT(offset + 2));
+ return;
+ }
+
+ pl061_write(pl061, BIT(offset), pl061->variant->mask);
+ pl061_write(pl061, value ? BIT(offset) : 0, pl061->variant->data);
+}
+
+static void pl061_claim_gpio(struct pl061 *pl061, unsigned int offset)
+{
+ u32 afsel;
+
+ if (pl061->variant->afsel == PL061_REG_NONE)
+ return;
+
+ afsel = pl061_read(pl061, pl061->variant->afsel);
+ if (afsel & BIT(offset))
+ pl061_write(pl061, afsel & ~BIT(offset),
+ pl061->variant->afsel);
+}
+
static int pl061_get_direction(struct gpio_chip *gc, unsigned offset)
{
struct pl061 *pl061 = gpiochip_get_data(gc);
- if (readb(pl061->base + GPIODIR) & BIT(offset))
+ if (pl061_read(pl061, pl061->variant->dir) & BIT(offset))
return GPIO_LINE_DIRECTION_OUT;
return GPIO_LINE_DIRECTION_IN;
@@ -70,12 +136,13 @@ static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
{
struct pl061 *pl061 = gpiochip_get_data(gc);
unsigned long flags;
- unsigned char gpiodir;
+ u32 gpiodir;
raw_spin_lock_irqsave(&pl061->lock, flags);
- gpiodir = readb(pl061->base + GPIODIR);
+ gpiodir = pl061_read(pl061, pl061->variant->dir);
gpiodir &= ~(BIT(offset));
- writeb(gpiodir, pl061->base + GPIODIR);
+ pl061_write(pl061, gpiodir, pl061->variant->dir);
+ pl061_claim_gpio(pl061, offset);
raw_spin_unlock_irqrestore(&pl061->lock, flags);
return 0;
@@ -86,19 +153,21 @@ static int pl061_direction_output(struct gpio_chip *gc, unsigned offset,
{
struct pl061 *pl061 = gpiochip_get_data(gc);
unsigned long flags;
- unsigned char gpiodir;
+ u32 gpiodir;
raw_spin_lock_irqsave(&pl061->lock, flags);
- writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
- gpiodir = readb(pl061->base + GPIODIR);
+ pl061_set_data(pl061, offset, value);
+ gpiodir = pl061_read(pl061, pl061->variant->dir);
gpiodir |= BIT(offset);
- writeb(gpiodir, pl061->base + GPIODIR);
+ pl061_write(pl061, gpiodir, pl061->variant->dir);
/*
* gpio value is set again, because pl061 doesn't allow to set value of
* a gpio pin before configuring it in OUT mode.
*/
- writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
+ if (pl061->variant->write_data_after_dir)
+ pl061_set_data(pl061, offset, value);
+ pl061_claim_gpio(pl061, offset);
raw_spin_unlock_irqrestore(&pl061->lock, flags);
return 0;
@@ -107,15 +176,24 @@ static int pl061_direction_output(struct gpio_chip *gc, unsigned offset,
static int pl061_get_value(struct gpio_chip *gc, unsigned offset)
{
struct pl061 *pl061 = gpiochip_get_data(gc);
+ unsigned long flags;
+ int value;
- return !!readb(pl061->base + (BIT(offset + 2)));
+ raw_spin_lock_irqsave(&pl061->lock, flags);
+ value = pl061_get_data(pl061, offset);
+ raw_spin_unlock_irqrestore(&pl061->lock, flags);
+
+ return value;
}
static int pl061_set_value(struct gpio_chip *gc, unsigned int offset, int value)
{
struct pl061 *pl061 = gpiochip_get_data(gc);
+ unsigned long flags;
- writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
+ raw_spin_lock_irqsave(&pl061->lock, flags);
+ pl061_set_data(pl061, offset, value);
+ raw_spin_unlock_irqrestore(&pl061->lock, flags);
return 0;
}
@@ -126,15 +204,14 @@ static int pl061_irq_type(struct irq_data *d, unsigned trigger)
struct pl061 *pl061 = gpiochip_get_data(gc);
int offset = irqd_to_hwirq(d);
unsigned long flags;
- u8 gpiois, gpioibe, gpioiev;
- u8 bit = BIT(offset);
+ u32 gpiois, gpioibe, gpioiev;
+ u32 bit = BIT(offset);
- if (offset < 0 || offset >= PL061_GPIO_NR)
+ if (offset < 0 || offset >= gc->ngpio)
return -EINVAL;
if ((trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) &&
- (trigger & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)))
- {
+ (trigger & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))) {
dev_err(gc->parent,
"trying to configure line %d for both level and edge "
"detection, choose one!\n",
@@ -142,12 +219,11 @@ static int pl061_irq_type(struct irq_data *d, unsigned trigger)
return -EINVAL;
}
-
raw_spin_lock_irqsave(&pl061->lock, flags);
- gpioiev = readb(pl061->base + GPIOIEV);
- gpiois = readb(pl061->base + GPIOIS);
- gpioibe = readb(pl061->base + GPIOIBE);
+ gpioiev = pl061_read(pl061, pl061->variant->iev);
+ gpiois = pl061_read(pl061, pl061->variant->is);
+ gpioibe = pl061_read(pl061, pl061->variant->ibe);
if (trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
bool polarity = trigger & IRQ_TYPE_LEVEL_HIGH;
@@ -199,9 +275,11 @@ static int pl061_irq_type(struct irq_data *d, unsigned trigger)
offset);
}
- writeb(gpiois, pl061->base + GPIOIS);
- writeb(gpioibe, pl061->base + GPIOIBE);
- writeb(gpioiev, pl061->base + GPIOIEV);
+ pl061_write(pl061, gpiois, pl061->variant->is);
+ pl061_write(pl061, gpioibe, pl061->variant->ibe);
+ pl061_write(pl061, gpioiev, pl061->variant->iev);
+ if (pl061->variant->clear_irq_on_type)
+ pl061_write(pl061, bit, pl061->variant->ic);
raw_spin_unlock_irqrestore(&pl061->lock, flags);
@@ -218,9 +296,9 @@ static void pl061_irq_handler(struct irq_desc *desc)
chained_irq_enter(irqchip, desc);
- pending = readb(pl061->base + GPIOMIS);
+ pending = pl061_read(pl061, pl061->variant->mis);
if (pending) {
- for_each_set_bit(offset, &pending, PL061_GPIO_NR)
+ for_each_set_bit(offset, &pending, gc->ngpio)
generic_handle_domain_irq(gc->irq.domain,
offset);
}
@@ -232,12 +310,12 @@ static void pl061_irq_mask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct pl061 *pl061 = gpiochip_get_data(gc);
- u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
- u8 gpioie;
+ u32 mask = BIT(irqd_to_hwirq(d));
+ u32 gpioie;
raw_spin_lock(&pl061->lock);
- gpioie = readb(pl061->base + GPIOIE) & ~mask;
- writeb(gpioie, pl061->base + GPIOIE);
+ gpioie = pl061_read(pl061, pl061->variant->ie) & ~mask;
+ pl061_write(pl061, gpioie, pl061->variant->ie);
raw_spin_unlock(&pl061->lock);
gpiochip_disable_irq(gc, d->hwirq);
@@ -247,14 +325,14 @@ static void pl061_irq_unmask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct pl061 *pl061 = gpiochip_get_data(gc);
- u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
- u8 gpioie;
+ u32 mask = BIT(irqd_to_hwirq(d));
+ u32 gpioie;
gpiochip_enable_irq(gc, d->hwirq);
raw_spin_lock(&pl061->lock);
- gpioie = readb(pl061->base + GPIOIE) | mask;
- writeb(gpioie, pl061->base + GPIOIE);
+ gpioie = pl061_read(pl061, pl061->variant->ie) | mask;
+ pl061_write(pl061, gpioie, pl061->variant->ie);
raw_spin_unlock(&pl061->lock);
}
@@ -270,10 +348,10 @@ static void pl061_irq_ack(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct pl061 *pl061 = gpiochip_get_data(gc);
- u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
+ u32 mask = BIT(irqd_to_hwirq(d));
raw_spin_lock(&pl061->lock);
- writeb(mask, pl061->base + GPIOIC);
+ pl061_write(pl061, mask, pl061->variant->ic);
raw_spin_unlock(&pl061->lock);
}
@@ -292,6 +370,24 @@ static void pl061_irq_print_chip(struct irq_data *data, struct seq_file *p)
seq_puts(p, dev_name(gc->parent));
}
+static int pl061_irq_request_resources(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct pl061 *pl061 = gpiochip_get_data(gc);
+ unsigned long flags;
+ int ret;
+
+ ret = gpiochip_irq_reqres(d);
+ if (ret)
+ return ret;
+
+ raw_spin_lock_irqsave(&pl061->lock, flags);
+ pl061_claim_gpio(pl061, irqd_to_hwirq(d));
+ raw_spin_unlock_irqrestore(&pl061->lock, flags);
+
+ return 0;
+}
+
static const struct irq_chip pl061_irq_chip = {
.irq_ack = pl061_irq_ack,
.irq_mask = pl061_irq_mask,
@@ -299,8 +395,9 @@ static const struct irq_chip pl061_irq_chip = {
.irq_set_type = pl061_irq_type,
.irq_set_wake = pl061_irq_set_wake,
.irq_print_chip = pl061_irq_print_chip,
+ .irq_request_resources = pl061_irq_request_resources,
+ .irq_release_resources = gpiochip_irq_relres,
.flags = IRQCHIP_IMMUTABLE,
- GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
@@ -314,6 +411,10 @@ static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
if (pl061 == NULL)
return -ENOMEM;
+ pl061->variant = id->data;
+ if (!pl061->variant)
+ return dev_err_probe(dev, -EINVAL, "missing variant data\n");
+
pl061->base = devm_ioremap_resource(dev, &adev->res);
if (IS_ERR(pl061->base))
return PTR_ERR(pl061->base);
@@ -327,7 +428,7 @@ static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
pl061->gc.direction_output = pl061_direction_output;
pl061->gc.get = pl061_get_value;
pl061->gc.set = pl061_set_value;
- pl061->gc.ngpio = PL061_GPIO_NR;
+ pl061->gc.ngpio = pl061->variant->ngpio;
pl061->gc.label = dev_name(dev);
pl061->gc.parent = dev;
pl061->gc.owner = THIS_MODULE;
@@ -335,7 +436,12 @@ static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
/*
* irq_chip support
*/
- writeb(0, pl061->base + GPIOIE); /* disable irqs */
+ pl061_write(pl061, 0, pl061->variant->ie); /* disable irqs */
+ if (pl061->variant->enable != PL061_REG_NONE)
+ pl061_write(pl061, GENMASK(pl061->gc.ngpio - 1, 0),
+ pl061->variant->enable);
+ if (pl061->variant->mask != PL061_REG_NONE)
+ pl061_write(pl061, 0, pl061->variant->mask);
irq = adev->irq[0];
if (!irq)
dev_warn(&adev->dev, "IRQ support disabled\n");
@@ -366,20 +472,37 @@ static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
static int pl061_suspend(struct device *dev)
{
struct pl061 *pl061 = dev_get_drvdata(dev);
+ unsigned long flags;
int offset;
+ raw_spin_lock_irqsave(&pl061->lock, flags);
pl061->csave_regs.gpio_data = 0;
- pl061->csave_regs.gpio_dir = readb(pl061->base + GPIODIR);
- pl061->csave_regs.gpio_is = readb(pl061->base + GPIOIS);
- pl061->csave_regs.gpio_ibe = readb(pl061->base + GPIOIBE);
- pl061->csave_regs.gpio_iev = readb(pl061->base + GPIOIEV);
- pl061->csave_regs.gpio_ie = readb(pl061->base + GPIOIE);
-
- for (offset = 0; offset < PL061_GPIO_NR; offset++) {
- if (pl061->csave_regs.gpio_dir & (BIT(offset)))
- pl061->csave_regs.gpio_data |=
- pl061_get_value(&pl061->gc, offset) << offset;
+ pl061->csave_regs.gpio_dir =
+ pl061_read(pl061, pl061->variant->dir);
+ pl061->csave_regs.gpio_is =
+ pl061_read(pl061, pl061->variant->is);
+ pl061->csave_regs.gpio_ibe =
+ pl061_read(pl061, pl061->variant->ibe);
+ pl061->csave_regs.gpio_iev =
+ pl061_read(pl061, pl061->variant->iev);
+ pl061->csave_regs.gpio_ie =
+ pl061_read(pl061, pl061->variant->ie);
+ if (pl061->variant->afsel != PL061_REG_NONE)
+ pl061->csave_regs.gpio_afsel =
+ pl061_read(pl061, pl061->variant->afsel);
+ if (pl061->variant->mask != PL061_REG_NONE)
+ pl061->csave_regs.gpio_mask =
+ pl061_read(pl061, pl061->variant->mask);
+
+ for (offset = 0; offset < pl061->gc.ngpio; offset++) {
+ if ((pl061->csave_regs.gpio_dir & BIT(offset)) &&
+ pl061_get_data(pl061, offset))
+ pl061->csave_regs.gpio_data |= BIT(offset);
}
+ if (pl061->variant->mask != PL061_REG_NONE)
+ pl061_write(pl061, pl061->csave_regs.gpio_mask,
+ pl061->variant->mask);
+ raw_spin_unlock_irqrestore(&pl061->lock, flags);
return 0;
}
@@ -389,7 +512,7 @@ static int pl061_resume(struct device *dev)
struct pl061 *pl061 = dev_get_drvdata(dev);
int offset;
- for (offset = 0; offset < PL061_GPIO_NR; offset++) {
+ for (offset = 0; offset < pl061->gc.ngpio; offset++) {
if (pl061->csave_regs.gpio_dir & (BIT(offset)))
pl061_direction_output(&pl061->gc, offset,
pl061->csave_regs.gpio_data &
@@ -398,20 +521,75 @@ static int pl061_resume(struct device *dev)
pl061_direction_input(&pl061->gc, offset);
}
- writeb(pl061->csave_regs.gpio_is, pl061->base + GPIOIS);
- writeb(pl061->csave_regs.gpio_ibe, pl061->base + GPIOIBE);
- writeb(pl061->csave_regs.gpio_iev, pl061->base + GPIOIEV);
- writeb(pl061->csave_regs.gpio_ie, pl061->base + GPIOIE);
+ pl061_write(pl061, pl061->csave_regs.gpio_is,
+ pl061->variant->is);
+ pl061_write(pl061, pl061->csave_regs.gpio_ibe,
+ pl061->variant->ibe);
+ pl061_write(pl061, pl061->csave_regs.gpio_iev,
+ pl061->variant->iev);
+ pl061_write(pl061, pl061->csave_regs.gpio_ie,
+ pl061->variant->ie);
+ if (pl061->variant->afsel != PL061_REG_NONE)
+ pl061_write(pl061, pl061->csave_regs.gpio_afsel,
+ pl061->variant->afsel);
+ if (pl061->variant->mask != PL061_REG_NONE)
+ pl061_write(pl061, pl061->csave_regs.gpio_mask,
+ pl061->variant->mask);
+ if (pl061->variant->enable != PL061_REG_NONE)
+ pl061_write(pl061, GENMASK(pl061->gc.ngpio - 1, 0),
+ pl061->variant->enable);
return 0;
}
static DEFINE_SIMPLE_DEV_PM_OPS(pl061_dev_pm_ops, pl061_suspend, pl061_resume);
+static struct pl061_variant_data pl061_arm = {
+ .data = 0x000,
+ .dir = 0x400,
+ .is = 0x404,
+ .ibe = 0x408,
+ .iev = 0x40c,
+ .ie = 0x410,
+ .ris = 0x414,
+ .mis = 0x418,
+ .ic = 0x41c,
+ .afsel = PL061_REG_NONE,
+ .mask = PL061_REG_NONE,
+ .enable = PL061_REG_NONE,
+ .ngpio = PL061_GPIO_NR,
+ .masked_data_address = true,
+ .write_data_after_dir = true,
+};
+
+static struct pl061_variant_data pl061_ambarella = {
+ .data = 0x00,
+ .dir = 0x04,
+ .is = 0x08,
+ .ibe = 0x0c,
+ .iev = 0x10,
+ .ie = 0x14,
+ .afsel = 0x18,
+ .ris = 0x1c,
+ .mis = 0x20,
+ .ic = 0x24,
+ .mask = 0x28,
+ .enable = 0x2c,
+ .ngpio = 32,
+ .access_32bit = true,
+ .clear_irq_on_type = true,
+};
+
static const struct amba_id pl061_ids[] = {
{
.id = 0x00041061,
.mask = 0x000fffff,
+ .data = &pl061_arm,
+ },
+ {
+ .id = PL061_AMBARELLA_PERIPH_ID,
+ .mask = 0xffffffff,
+ .data = &pl061_ambarella,
},
{ 0, 0 },
};
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread* Re: [PATCH v5 08/12] gpio: pl061: add Ambarella CV75 register layout variant
2026-08-18 10:31 ` [PATCH v5 08/12] gpio: pl061: add Ambarella CV75 register layout variant Long Zhao via B4 Relay
@ 2026-08-18 14:11 ` Andy Shevchenko
0 siblings, 0 replies; 15+ messages in thread
From: Andy Shevchenko @ 2026-08-18 14:11 UTC (permalink / raw)
To: longzhao
Cc: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel, Rob Herring, Krzysztof Kozlowski, Conor Dooley,
Michael Turquette, Stephen Boyd, Linus Walleij,
Bartosz Golaszewski, Greg Kroah-Hartman, Jiri Slaby,
Catalin Marinas, Will Deacon, devicetree, linux-clk, linux-gpio,
linux-serial, linux-kernel, Brian Masney, Lee Jones, mfd,
Long Zhao
On Tue, Aug 18, 2026 at 06:31:22PM +0800, Long Zhao via B4 Relay wrote:
> Extend gpio-pl061 with a per-variant register layout so the Ambarella
> CV75 GPIO banks can reuse the PL061 driver instead of a duplicate.
This is reinvention of gpio-mmio.c (as a library). It has necessary facilities.
Also gpio-regmap may be considered. So, switch this driver to use one of the
above and the patch for the new device will be much simpler and elegant.
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 15+ messages in thread
* [PATCH v5 09/12] pinctrl: ambarella: add CV75 pin controller
2026-08-18 10:31 [PATCH v5 00/12] Ambarella CV75 SoC minimal bring-up Long Zhao via B4 Relay
` (7 preceding siblings ...)
2026-08-18 10:31 ` [PATCH v5 08/12] gpio: pl061: add Ambarella CV75 register layout variant Long Zhao via B4 Relay
@ 2026-08-18 10:31 ` Long Zhao via B4 Relay
2026-08-18 10:31 ` [PATCH v5 10/12] serial: 8250: add Ambarella UART driver Long Zhao via B4 Relay
` (2 subsequent siblings)
11 siblings, 0 replies; 15+ messages in thread
From: Long Zhao via B4 Relay @ 2026-08-18 10:31 UTC (permalink / raw)
To: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Michael Turquette,
Stephen Boyd, Linus Walleij, Bartosz Golaszewski,
Greg Kroah-Hartman, Jiri Slaby, Andy Shevchenko, Catalin Marinas,
Will Deacon, devicetree, linux-clk, linux-gpio, linux-serial,
linux-kernel, Brian Masney, Lee Jones, mfd, Long Zhao, Long Zhao
From: Long Zhao <longzhao@ambarella.com>
Add an Ambarella pinmux-only pinctrl driver with CV75 function/group
tables. GPIO is handled by the PL061 driver.
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
drivers/pinctrl/Kconfig | 15 +
drivers/pinctrl/Makefile | 2 +
drivers/pinctrl/pinctrl-ambarella-cv75.c | 561 ++++++++++++++++++++
drivers/pinctrl/pinctrl-ambarella.c | 863 +++++++++++++++++++++++++++++++
drivers/pinctrl/pinctrl-ambarella.h | 50 ++
5 files changed, 1491 insertions(+)
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index c2cdd7b2c49b..da423792b5fa 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -37,6 +37,21 @@ config DEBUG_PINCTRL
help
Say Y here to add some extra checks and diagnostics to PINCTRL calls.
+config PINCTRL_AMB
+ bool "Ambarella pin controller support"
+ depends on ARCH_AMBARELLA || COMPILE_TEST
+ depends on HAS_IOMEM
+ default y if ARCH_AMBARELLA
+ select GENERIC_PINCONF
+ select GPIOLIB
+ select GPIOLIB_IRQCHIP
+ select GPIO_PL061
+ select MFD_SYSCON
+ select PINCONF
+ select PINMUX
+ help
+ Say Y here to enable the Ambarella pin controller driver.
+
config PINCTRL_AMD
bool "AMD GPIO pin control"
depends on HAS_IOMEM
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index a35d71135abf..ce0825f4fc1b 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -10,6 +10,8 @@ obj-$(CONFIG_GENERIC_PINCONF) += pinconf-generic.o
obj-$(CONFIG_GENERIC_PINCTRL) += pinctrl-generic.o
obj-$(CONFIG_OF) += devicetree.o
+obj-$(CONFIG_PINCTRL_AMB) += pinctrl-ambarella.o
+obj-$(CONFIG_PINCTRL_AMB) += pinctrl-ambarella-cv75.o
obj-$(CONFIG_PINCTRL_AMD) += pinctrl-amd.o
obj-$(CONFIG_PINCTRL_AMDISP) += pinctrl-amdisp.o
obj-$(CONFIG_PINCTRL_APPLE_GPIO) += pinctrl-apple-gpio.o
diff --git a/drivers/pinctrl/pinctrl-ambarella-cv75.c b/drivers/pinctrl/pinctrl-ambarella-cv75.c
new file mode 100644
index 000000000000..e617f0717b31
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-ambarella-cv75.c
@@ -0,0 +1,561 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Ambarella CV75 pinctrl data
+ *
+ * Copyright (C) 2026, Ambarella, Inc.
+ */
+
+#include <linux/kernel.h>
+
+#include "pinctrl-ambarella.h"
+
+#define CV75_PINMUX_GROUP(_name, ...) \
+ static const u32 cv75_##_name##_pinmux[] = { __VA_ARGS__ }
+
+#define CV75_GROUP(_name) \
+ { \
+ .name = #_name, \
+ .pinmux = cv75_##_name##_pinmux, \
+ .num_pins = ARRAY_SIZE(cv75_##_name##_pinmux), \
+ }
+
+#define CV75_FUNCTION(_name) \
+ { \
+ .name = #_name, \
+ .groups = cv75_##_name##_groups, \
+ .num_groups = ARRAY_SIZE(cv75_##_name##_groups), \
+ }
+
+/* UART */
+CV75_PINMUX_GROUP(uart0, AMBA_PINMUX(44, 1), AMBA_PINMUX(45, 1));
+CV75_PINMUX_GROUP(uart1, AMBA_PINMUX(46, 1), AMBA_PINMUX(47, 1));
+CV75_PINMUX_GROUP(uart1_flow, AMBA_PINMUX(48, 1), AMBA_PINMUX(49, 1));
+CV75_PINMUX_GROUP(uart2_a, AMBA_PINMUX(46, 2), AMBA_PINMUX(47, 2));
+CV75_PINMUX_GROUP(uart2_b, AMBA_PINMUX(50, 2), AMBA_PINMUX(51, 2));
+CV75_PINMUX_GROUP(uart2_c, AMBA_PINMUX(66, 2), AMBA_PINMUX(68, 2));
+CV75_PINMUX_GROUP(uart2_flow_a, AMBA_PINMUX(48, 2), AMBA_PINMUX(49, 2));
+CV75_PINMUX_GROUP(uart2_flow_b, AMBA_PINMUX(65, 3), AMBA_PINMUX(67, 3));
+CV75_PINMUX_GROUP(uart3_a, AMBA_PINMUX(70, 3), AMBA_PINMUX(72, 3));
+CV75_PINMUX_GROUP(uart3_b, AMBA_PINMUX(80, 3), AMBA_PINMUX(79, 3));
+CV75_PINMUX_GROUP(uart3_flow_a, AMBA_PINMUX(71, 3), AMBA_PINMUX(69, 3));
+CV75_PINMUX_GROUP(uart3_flow_b, AMBA_PINMUX(81, 3), AMBA_PINMUX(82, 3));
+CV75_PINMUX_GROUP(uart4_a, AMBA_PINMUX(29, 3), AMBA_PINMUX(30, 3));
+CV75_PINMUX_GROUP(uart4_b, AMBA_PINMUX(76, 3), AMBA_PINMUX(77, 3));
+CV75_PINMUX_GROUP(uart4_flow_a, AMBA_PINMUX(28, 3), AMBA_PINMUX(31, 3));
+CV75_PINMUX_GROUP(uart4_flow_b, AMBA_PINMUX(74, 3), AMBA_PINMUX(75, 3));
+
+/* Flash */
+CV75_PINMUX_GROUP(snand, AMBA_PINMUX(79, 1), AMBA_PINMUX(80, 1),
+ AMBA_PINMUX(81, 1), AMBA_PINMUX(82, 1),
+ AMBA_PINMUX(83, 1), AMBA_PINMUX(84, 1));
+CV75_PINMUX_GROUP(spinor, AMBA_PINMUX(79, 2), AMBA_PINMUX(80, 2),
+ AMBA_PINMUX(81, 2), AMBA_PINMUX(82, 2),
+ AMBA_PINMUX(83, 2), AMBA_PINMUX(84, 2),
+ AMBA_PINMUX(85, 2));
+
+/* SD/MMC */
+CV75_PINMUX_GROUP(sdmmc0_cd, AMBA_PINMUX(6, 1));
+CV75_PINMUX_GROUP(sdmmc0_wp, AMBA_PINMUX(7, 1));
+CV75_PINMUX_GROUP(sdmmc0_reset, AMBA_PINMUX(8, 1));
+CV75_PINMUX_GROUP(sdmmc0_hs_sel, AMBA_PINMUX(93, 1));
+CV75_PINMUX_GROUP(sdmmc0_1bit, AMBA_PINMUX(0, 1), AMBA_PINMUX(4, 1),
+ AMBA_PINMUX(5, 1));
+CV75_PINMUX_GROUP(sdmmc0_4bit, AMBA_PINMUX(0, 1), AMBA_PINMUX(1, 1),
+ AMBA_PINMUX(2, 1), AMBA_PINMUX(3, 1),
+ AMBA_PINMUX(4, 1), AMBA_PINMUX(5, 1));
+CV75_PINMUX_GROUP(sdmmc1_cd, AMBA_PINMUX(15, 1));
+CV75_PINMUX_GROUP(sdmmc1_wp, AMBA_PINMUX(16, 1));
+CV75_PINMUX_GROUP(sdmmc1_reset, AMBA_PINMUX(17, 1));
+CV75_PINMUX_GROUP(sdmmc1_hs_sel, AMBA_PINMUX(94, 1));
+CV75_PINMUX_GROUP(sdmmc1_1bit, AMBA_PINMUX(9, 1), AMBA_PINMUX(13, 1),
+ AMBA_PINMUX(14, 1));
+CV75_PINMUX_GROUP(sdmmc1_4bit, AMBA_PINMUX(9, 1), AMBA_PINMUX(10, 1),
+ AMBA_PINMUX(11, 1), AMBA_PINMUX(12, 1),
+ AMBA_PINMUX(13, 1), AMBA_PINMUX(14, 1));
+
+/* Ethernet */
+CV75_PINMUX_GROUP(enet_ext_osc_clk, AMBA_PINMUX(77, 1));
+CV75_PINMUX_GROUP(enet_2nd_ref_clk_a, AMBA_PINMUX(78, 1));
+CV75_PINMUX_GROUP(enet_2nd_ref_clk_b, AMBA_PINMUX(76, 2));
+CV75_PINMUX_GROUP(enet0_ptp_pps_o, AMBA_PINMUX(74, 1));
+CV75_PINMUX_GROUP(rgmii0, AMBA_PINMUX(62, 1), AMBA_PINMUX(63, 1),
+ AMBA_PINMUX(64, 1), AMBA_PINMUX(65, 1),
+ AMBA_PINMUX(66, 1), AMBA_PINMUX(67, 1),
+ AMBA_PINMUX(68, 1), AMBA_PINMUX(69, 1),
+ AMBA_PINMUX(70, 1), AMBA_PINMUX(71, 1),
+ AMBA_PINMUX(72, 1), AMBA_PINMUX(73, 1),
+ AMBA_PINMUX(75, 1), AMBA_PINMUX(76, 1));
+CV75_PINMUX_GROUP(rmii0, AMBA_PINMUX(62, 1), AMBA_PINMUX(63, 1),
+ AMBA_PINMUX(64, 1), AMBA_PINMUX(67, 1),
+ AMBA_PINMUX(68, 1), AMBA_PINMUX(71, 1),
+ AMBA_PINMUX(72, 1), AMBA_PINMUX(73, 1),
+ AMBA_PINMUX(75, 2));
+
+/* I2C */
+CV75_PINMUX_GROUP(i2c0_a, AMBA_PINMUX(67, 2), AMBA_PINMUX(68, 2));
+CV75_PINMUX_GROUP(i2c0_b, AMBA_PINMUX(86, 1), AMBA_PINMUX(87, 1));
+CV75_PINMUX_GROUP(i2c1_a, AMBA_PINMUX(22, 2), AMBA_PINMUX(23, 2));
+CV75_PINMUX_GROUP(i2c1_b, AMBA_PINMUX(69, 2), AMBA_PINMUX(70, 2));
+CV75_PINMUX_GROUP(i2c2, AMBA_PINMUX(88, 1), AMBA_PINMUX(89, 1));
+CV75_PINMUX_GROUP(i2c3_a, AMBA_PINMUX(24, 2), AMBA_PINMUX(25, 2));
+CV75_PINMUX_GROUP(i2c3_b, AMBA_PINMUX(48, 3), AMBA_PINMUX(49, 3));
+CV75_PINMUX_GROUP(i2c3_c, AMBA_PINMUX(58, 3), AMBA_PINMUX(59, 3));
+CV75_PINMUX_GROUP(i2cs_a, AMBA_PINMUX(19, 2), AMBA_PINMUX(21, 2));
+CV75_PINMUX_GROUP(i2cs_b, AMBA_PINMUX(60, 3), AMBA_PINMUX(61, 3));
+CV75_PINMUX_GROUP(i2cs_c, AMBA_PINMUX(71, 2), AMBA_PINMUX(72, 2));
+CV75_PINMUX_GROUP(i2cs_d, AMBA_PINMUX(86, 2), AMBA_PINMUX(87, 2));
+
+/* CAN, IR, WDT */
+CV75_PINMUX_GROUP(can0, AMBA_PINMUX(50, 1), AMBA_PINMUX(51, 1));
+CV75_PINMUX_GROUP(can1, AMBA_PINMUX(52, 1), AMBA_PINMUX(53, 1));
+CV75_PINMUX_GROUP(ir, AMBA_PINMUX(18, 1));
+CV75_PINMUX_GROUP(wdt_a, AMBA_PINMUX(20, 2));
+CV75_PINMUX_GROUP(wdt_b, AMBA_PINMUX(27, 3));
+CV75_PINMUX_GROUP(wdt_c, AMBA_PINMUX(39, 2));
+CV75_PINMUX_GROUP(wdt_d, AMBA_PINMUX(83, 3));
+CV75_PINMUX_GROUP(wdt_e, AMBA_PINMUX(85, 4));
+CV75_PINMUX_GROUP(wdt_f, AMBA_PINMUX(90, 1));
+
+/* I2S */
+CV75_PINMUX_GROUP(i2s0, AMBA_PINMUX(54, 1), AMBA_PINMUX(55, 1),
+ AMBA_PINMUX(56, 1), AMBA_PINMUX(57, 1));
+CV75_PINMUX_GROUP(i2s1, AMBA_PINMUX(58, 1), AMBA_PINMUX(59, 1),
+ AMBA_PINMUX(60, 1), AMBA_PINMUX(61, 1));
+CV75_PINMUX_GROUP(clk_au, AMBA_PINMUX(96, 1));
+CV75_PINMUX_GROUP(dmic0, AMBA_PINMUX(54, 2), AMBA_PINMUX(55, 2));
+
+/* PWM */
+CV75_PINMUX_GROUP(pwm0, AMBA_PINMUX(40, 1));
+CV75_PINMUX_GROUP(pwm1, AMBA_PINMUX(41, 1));
+CV75_PINMUX_GROUP(pwm2, AMBA_PINMUX(42, 1));
+CV75_PINMUX_GROUP(pwm3, AMBA_PINMUX(43, 1));
+CV75_PINMUX_GROUP(pwm4_a, AMBA_PINMUX(19, 3));
+CV75_PINMUX_GROUP(pwm4_b, AMBA_PINMUX(32, 4));
+CV75_PINMUX_GROUP(pwm5_a, AMBA_PINMUX(20, 3));
+CV75_PINMUX_GROUP(pwm5_b, AMBA_PINMUX(33, 4));
+CV75_PINMUX_GROUP(pwm6_a, AMBA_PINMUX(21, 3));
+CV75_PINMUX_GROUP(pwm6_b, AMBA_PINMUX(34, 4));
+CV75_PINMUX_GROUP(pwm7_a, AMBA_PINMUX(22, 3));
+CV75_PINMUX_GROUP(pwm7_b, AMBA_PINMUX(35, 4));
+CV75_PINMUX_GROUP(pwm8_a, AMBA_PINMUX(23, 3));
+CV75_PINMUX_GROUP(pwm8_b, AMBA_PINMUX(36, 4));
+CV75_PINMUX_GROUP(pwm9_a, AMBA_PINMUX(24, 3));
+CV75_PINMUX_GROUP(pwm9_b, AMBA_PINMUX(37, 4));
+CV75_PINMUX_GROUP(pwm10_a, AMBA_PINMUX(25, 3));
+CV75_PINMUX_GROUP(pwm10_b, AMBA_PINMUX(38, 4));
+CV75_PINMUX_GROUP(pwm11_a, AMBA_PINMUX(26, 3));
+CV75_PINMUX_GROUP(pwm11_b, AMBA_PINMUX(39, 4));
+
+/* SPI */
+CV75_PINMUX_GROUP(spi0, AMBA_PINMUX(19, 1), AMBA_PINMUX(20, 1),
+ AMBA_PINMUX(21, 1));
+CV75_PINMUX_GROUP(spi1, AMBA_PINMUX(24, 1), AMBA_PINMUX(25, 1),
+ AMBA_PINMUX(26, 1));
+CV75_PINMUX_GROUP(spi2, AMBA_PINMUX(28, 1), AMBA_PINMUX(29, 1),
+ AMBA_PINMUX(30, 1));
+CV75_PINMUX_GROUP(spi3_a, AMBA_PINMUX(32, 5), AMBA_PINMUX(33, 5),
+ AMBA_PINMUX(34, 5));
+CV75_PINMUX_GROUP(spi3_b, AMBA_PINMUX(40, 2), AMBA_PINMUX(41, 2),
+ AMBA_PINMUX(43, 2));
+CV75_PINMUX_GROUP(spi3_c, AMBA_PINMUX(58, 2), AMBA_PINMUX(59, 2),
+ AMBA_PINMUX(60, 2));
+CV75_PINMUX_GROUP(spi_slave_a, AMBA_PINMUX(24, 4), AMBA_PINMUX(25, 4),
+ AMBA_PINMUX(26, 4), AMBA_PINMUX(27, 4));
+CV75_PINMUX_GROUP(spi_slave_b, AMBA_PINMUX(28, 2), AMBA_PINMUX(29, 2),
+ AMBA_PINMUX(30, 2), AMBA_PINMUX(31, 2));
+CV75_PINMUX_GROUP(spi_slave_c, AMBA_PINMUX(36, 5), AMBA_PINMUX(37, 5),
+ AMBA_PINMUX(38, 5), AMBA_PINMUX(39, 5));
+CV75_PINMUX_GROUP(spi_slave_d, AMBA_PINMUX(50, 3), AMBA_PINMUX(51, 3),
+ AMBA_PINMUX(52, 3), AMBA_PINMUX(53, 3));
+CV75_PINMUX_GROUP(spi_slave_e, AMBA_PINMUX(81, 4), AMBA_PINMUX(82, 4),
+ AMBA_PINMUX(83, 4), AMBA_PINMUX(84, 4));
+
+/* VIN master sync */
+CV75_PINMUX_GROUP(vin_master_sync_a, AMBA_PINMUX(91, 1),
+ AMBA_PINMUX(92, 1));
+CV75_PINMUX_GROUP(vin_master_sync_b, AMBA_PINMUX(91, 2),
+ AMBA_PINMUX(92, 2));
+CV75_PINMUX_GROUP(vin_master_sync_c, AMBA_PINMUX(40, 3),
+ AMBA_PINMUX(41, 3));
+CV75_PINMUX_GROUP(vin_master_sync_d, AMBA_PINMUX(46, 3),
+ AMBA_PINMUX(47, 3));
+CV75_PINMUX_GROUP(vin_master_sync_e, AMBA_PINMUX(79, 4),
+ AMBA_PINMUX(80, 4));
+CV75_PINMUX_GROUP(vsync0, AMBA_PINMUX(32, 1));
+CV75_PINMUX_GROUP(vsync1, AMBA_PINMUX(33, 1));
+CV75_PINMUX_GROUP(vsync2, AMBA_PINMUX(34, 1));
+CV75_PINMUX_GROUP(vsync3, AMBA_PINMUX(35, 1));
+CV75_PINMUX_GROUP(hsync0, AMBA_PINMUX(36, 1));
+CV75_PINMUX_GROUP(hsync1, AMBA_PINMUX(37, 1));
+
+static const struct ambpin_group_desc cv75_pin_groups[] = {
+ CV75_GROUP(uart0),
+ CV75_GROUP(uart1), CV75_GROUP(uart1_flow),
+ CV75_GROUP(uart2_a), CV75_GROUP(uart2_b), CV75_GROUP(uart2_c),
+ CV75_GROUP(uart2_flow_a), CV75_GROUP(uart2_flow_b),
+ CV75_GROUP(uart3_a), CV75_GROUP(uart3_b),
+ CV75_GROUP(uart3_flow_a), CV75_GROUP(uart3_flow_b),
+ CV75_GROUP(uart4_a), CV75_GROUP(uart4_b),
+ CV75_GROUP(uart4_flow_a), CV75_GROUP(uart4_flow_b),
+ CV75_GROUP(snand), CV75_GROUP(spinor),
+ CV75_GROUP(sdmmc0_cd), CV75_GROUP(sdmmc0_wp),
+ CV75_GROUP(sdmmc0_reset), CV75_GROUP(sdmmc0_hs_sel),
+ CV75_GROUP(sdmmc0_1bit), CV75_GROUP(sdmmc0_4bit),
+ CV75_GROUP(sdmmc1_cd), CV75_GROUP(sdmmc1_wp),
+ CV75_GROUP(sdmmc1_reset), CV75_GROUP(sdmmc1_hs_sel),
+ CV75_GROUP(sdmmc1_1bit), CV75_GROUP(sdmmc1_4bit),
+ CV75_GROUP(enet_ext_osc_clk), CV75_GROUP(enet_2nd_ref_clk_a),
+ CV75_GROUP(enet_2nd_ref_clk_b), CV75_GROUP(enet0_ptp_pps_o),
+ CV75_GROUP(rgmii0), CV75_GROUP(rmii0),
+ CV75_GROUP(i2c0_a), CV75_GROUP(i2c0_b),
+ CV75_GROUP(i2c1_a), CV75_GROUP(i2c1_b), CV75_GROUP(i2c2),
+ CV75_GROUP(i2c3_a), CV75_GROUP(i2c3_b), CV75_GROUP(i2c3_c),
+ CV75_GROUP(i2cs_a), CV75_GROUP(i2cs_b),
+ CV75_GROUP(i2cs_c), CV75_GROUP(i2cs_d),
+ CV75_GROUP(can0), CV75_GROUP(can1), CV75_GROUP(ir),
+ CV75_GROUP(wdt_a), CV75_GROUP(wdt_b), CV75_GROUP(wdt_c),
+ CV75_GROUP(wdt_d), CV75_GROUP(wdt_e), CV75_GROUP(wdt_f),
+ CV75_GROUP(i2s0), CV75_GROUP(i2s1),
+ CV75_GROUP(clk_au), CV75_GROUP(dmic0),
+ CV75_GROUP(pwm0), CV75_GROUP(pwm1),
+ CV75_GROUP(pwm2), CV75_GROUP(pwm3),
+ CV75_GROUP(pwm4_a), CV75_GROUP(pwm4_b),
+ CV75_GROUP(pwm5_a), CV75_GROUP(pwm5_b),
+ CV75_GROUP(pwm6_a), CV75_GROUP(pwm6_b),
+ CV75_GROUP(pwm7_a), CV75_GROUP(pwm7_b),
+ CV75_GROUP(pwm8_a), CV75_GROUP(pwm8_b),
+ CV75_GROUP(pwm9_a), CV75_GROUP(pwm9_b),
+ CV75_GROUP(pwm10_a), CV75_GROUP(pwm10_b),
+ CV75_GROUP(pwm11_a), CV75_GROUP(pwm11_b),
+ CV75_GROUP(spi0), CV75_GROUP(spi1), CV75_GROUP(spi2),
+ CV75_GROUP(spi3_a), CV75_GROUP(spi3_b), CV75_GROUP(spi3_c),
+ CV75_GROUP(spi_slave_a), CV75_GROUP(spi_slave_b),
+ CV75_GROUP(spi_slave_c), CV75_GROUP(spi_slave_d),
+ CV75_GROUP(spi_slave_e),
+ CV75_GROUP(vin_master_sync_a), CV75_GROUP(vin_master_sync_b),
+ CV75_GROUP(vin_master_sync_c), CV75_GROUP(vin_master_sync_d),
+ CV75_GROUP(vin_master_sync_e),
+ CV75_GROUP(vsync0), CV75_GROUP(vsync1),
+ CV75_GROUP(vsync2), CV75_GROUP(vsync3),
+ CV75_GROUP(hsync0), CV75_GROUP(hsync1),
+};
+
+static const char * const cv75_uart0_groups[] = {
+ "uart0",
+};
+
+static const char * const cv75_uart1_groups[] = {
+ "uart1",
+ "uart1_flow",
+};
+
+static const char * const cv75_uart2_groups[] = {
+ "uart2_a",
+ "uart2_b",
+ "uart2_c",
+ "uart2_flow_a",
+ "uart2_flow_b",
+};
+
+static const char * const cv75_uart3_groups[] = {
+ "uart3_a",
+ "uart3_b",
+ "uart3_flow_a",
+ "uart3_flow_b",
+};
+
+static const char * const cv75_uart4_groups[] = {
+ "uart4_a",
+ "uart4_b",
+ "uart4_flow_a",
+ "uart4_flow_b",
+};
+
+static const char * const cv75_snand_groups[] = {
+ "snand",
+};
+
+static const char * const cv75_spinor_groups[] = {
+ "spinor",
+};
+
+static const char * const cv75_sdmmc0_groups[] = {
+ "sdmmc0_cd",
+ "sdmmc0_wp",
+ "sdmmc0_reset",
+ "sdmmc0_hs_sel",
+ "sdmmc0_1bit",
+ "sdmmc0_4bit",
+};
+
+static const char * const cv75_sdmmc1_groups[] = {
+ "sdmmc1_cd",
+ "sdmmc1_wp",
+ "sdmmc1_reset",
+ "sdmmc1_hs_sel",
+ "sdmmc1_1bit",
+ "sdmmc1_4bit",
+};
+
+static const char * const cv75_enet0_groups[] = {
+ "enet_ext_osc_clk",
+ "enet_2nd_ref_clk_a",
+ "enet_2nd_ref_clk_b",
+ "enet0_ptp_pps_o",
+ "rgmii0",
+ "rmii0",
+};
+
+static const char * const cv75_i2c0_groups[] = {
+ "i2c0_a",
+ "i2c0_b",
+};
+
+static const char * const cv75_i2c1_groups[] = {
+ "i2c1_a",
+ "i2c1_b",
+};
+
+static const char * const cv75_i2c2_groups[] = {
+ "i2c2",
+};
+
+static const char * const cv75_i2c3_groups[] = {
+ "i2c3_a",
+ "i2c3_b",
+ "i2c3_c",
+};
+
+static const char * const cv75_i2cs_groups[] = {
+ "i2cs_a",
+ "i2cs_b",
+ "i2cs_c",
+ "i2cs_d",
+};
+
+static const char * const cv75_can0_groups[] = {
+ "can0",
+};
+
+static const char * const cv75_can1_groups[] = {
+ "can1",
+};
+
+static const char * const cv75_ir_groups[] = {
+ "ir",
+};
+
+static const char * const cv75_wdt_groups[] = {
+ "wdt_a",
+ "wdt_b",
+ "wdt_c",
+ "wdt_d",
+ "wdt_e",
+ "wdt_f",
+};
+
+static const char * const cv75_i2s0_groups[] = {
+ "i2s0",
+};
+
+static const char * const cv75_i2s1_groups[] = {
+ "i2s1",
+};
+
+static const char * const cv75_clk_au_groups[] = {
+ "clk_au",
+};
+
+static const char * const cv75_dmic0_groups[] = {
+ "dmic0",
+};
+
+static const char * const cv75_pwm0_groups[] = {
+ "pwm0",
+};
+
+static const char * const cv75_pwm1_groups[] = {
+ "pwm1",
+};
+
+static const char * const cv75_pwm2_groups[] = {
+ "pwm2",
+};
+
+static const char * const cv75_pwm3_groups[] = {
+ "pwm3",
+};
+
+static const char * const cv75_pwm4_groups[] = {
+ "pwm4_a",
+ "pwm4_b",
+};
+
+static const char * const cv75_pwm5_groups[] = {
+ "pwm5_a",
+ "pwm5_b",
+};
+
+static const char * const cv75_pwm6_groups[] = {
+ "pwm6_a",
+ "pwm6_b",
+};
+
+static const char * const cv75_pwm7_groups[] = {
+ "pwm7_a",
+ "pwm7_b",
+};
+
+static const char * const cv75_pwm8_groups[] = {
+ "pwm8_a",
+ "pwm8_b",
+};
+
+static const char * const cv75_pwm9_groups[] = {
+ "pwm9_a",
+ "pwm9_b",
+};
+
+static const char * const cv75_pwm10_groups[] = {
+ "pwm10_a",
+ "pwm10_b",
+};
+
+static const char * const cv75_pwm11_groups[] = {
+ "pwm11_a",
+ "pwm11_b",
+};
+
+static const char * const cv75_spi0_groups[] = {
+ "spi0",
+};
+
+static const char * const cv75_spi1_groups[] = {
+ "spi1",
+};
+
+static const char * const cv75_spi2_groups[] = {
+ "spi2",
+};
+
+static const char * const cv75_spi3_groups[] = {
+ "spi3_a",
+ "spi3_b",
+ "spi3_c",
+};
+
+static const char * const cv75_spi_slave_groups[] = {
+ "spi_slave_a",
+ "spi_slave_b",
+ "spi_slave_c",
+ "spi_slave_d",
+ "spi_slave_e",
+};
+
+static const char * const cv75_vin_master_sync_groups[] = {
+ "vin_master_sync_a",
+ "vin_master_sync_b",
+ "vin_master_sync_c",
+ "vin_master_sync_d",
+ "vin_master_sync_e",
+};
+
+static const char * const cv75_vsync0_groups[] = {
+ "vsync0",
+};
+
+static const char * const cv75_vsync1_groups[] = {
+ "vsync1",
+};
+
+static const char * const cv75_vsync2_groups[] = {
+ "vsync2",
+};
+
+static const char * const cv75_vsync3_groups[] = {
+ "vsync3",
+};
+
+static const char * const cv75_hsync0_groups[] = {
+ "hsync0",
+};
+
+static const char * const cv75_hsync1_groups[] = {
+ "hsync1",
+};
+
+static const struct ambpin_function cv75_pin_functions[] = {
+ CV75_FUNCTION(uart0),
+ CV75_FUNCTION(uart1),
+ CV75_FUNCTION(uart2),
+ CV75_FUNCTION(uart3),
+ CV75_FUNCTION(uart4),
+ CV75_FUNCTION(snand),
+ CV75_FUNCTION(spinor),
+ CV75_FUNCTION(sdmmc0),
+ CV75_FUNCTION(sdmmc1),
+ CV75_FUNCTION(enet0),
+ CV75_FUNCTION(i2c0),
+ CV75_FUNCTION(i2c1),
+ CV75_FUNCTION(i2c2),
+ CV75_FUNCTION(i2c3),
+ CV75_FUNCTION(i2cs),
+ CV75_FUNCTION(can0),
+ CV75_FUNCTION(can1),
+ CV75_FUNCTION(ir),
+ CV75_FUNCTION(wdt),
+ CV75_FUNCTION(i2s0),
+ CV75_FUNCTION(i2s1),
+ CV75_FUNCTION(clk_au),
+ CV75_FUNCTION(dmic0),
+ CV75_FUNCTION(pwm0),
+ CV75_FUNCTION(pwm1),
+ CV75_FUNCTION(pwm2),
+ CV75_FUNCTION(pwm3),
+ CV75_FUNCTION(pwm4),
+ CV75_FUNCTION(pwm5),
+ CV75_FUNCTION(pwm6),
+ CV75_FUNCTION(pwm7),
+ CV75_FUNCTION(pwm8),
+ CV75_FUNCTION(pwm9),
+ CV75_FUNCTION(pwm10),
+ CV75_FUNCTION(pwm11),
+ CV75_FUNCTION(spi0),
+ CV75_FUNCTION(spi1),
+ CV75_FUNCTION(spi2),
+ CV75_FUNCTION(spi3),
+ CV75_FUNCTION(spi_slave),
+ CV75_FUNCTION(vin_master_sync),
+ CV75_FUNCTION(vsync0),
+ CV75_FUNCTION(vsync1),
+ CV75_FUNCTION(vsync2),
+ CV75_FUNCTION(vsync3),
+ CV75_FUNCTION(hsync0),
+ CV75_FUNCTION(hsync1),
+};
+
+const struct amb_pinctrl_data ambarella_cv75_pinctrl_data = {
+ .ds0 = {
+ 0x314, 0x320, 0x32c,
+ },
+ .ds1 = {
+ 0x318, 0x324, 0x330,
+ },
+ .ds2 = {
+ 0x31c, 0x328, 0x334,
+ },
+ .pull_en = {
+ 0x60, 0x64, 0x68,
+ },
+ .pull_dir = {
+ 0x7c, 0x80, 0x84,
+ },
+ .have_ds2 = true,
+ .clk_au_dedicated_pin = 96,
+ .nr_banks = 3,
+ .npins = 97,
+ .groups = cv75_pin_groups,
+ .nr_groups = ARRAY_SIZE(cv75_pin_groups),
+ .functions = cv75_pin_functions,
+ .nr_functions = ARRAY_SIZE(cv75_pin_functions),
+};
diff --git a/drivers/pinctrl/pinctrl-ambarella.c b/drivers/pinctrl/pinctrl-ambarella.c
new file mode 100644
index 000000000000..f9146d365c3c
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-ambarella.c
@@ -0,0 +1,863 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Pinctrl driver for Ambarella SoCs
+ *
+ * History:
+ * 2013/12/18 - [Cao Rongrong] created file
+ *
+ * Copyright (C) 2012-2026, Ambarella, Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/bitmap.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pm.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/seq_file.h>
+
+#include "pinconf.h"
+#include "pinctrl-ambarella.h"
+
+/* ==========================================================================*/
+
+#define IOMUX_OFFSET(bank, n) (((bank) * 0xc) + ((n) * 4))
+#define IOMUX_CTRL_SET_OFFSET 0xf0
+
+/* ==========================================================================*/
+
+#define AMBA_MAX_PINS (AMBA_MAX_BANKS * 32)
+
+#define PINID_TO_BANK(p) ((p) >> 5)
+#define PINID_TO_OFFSET(p) ((p) & 0x1f)
+
+struct amb_pinctrl_pm_state {
+ u32 iomux[3];
+ u32 pull[2];
+ u32 ds[3];
+};
+
+struct ambpin_group {
+ const char *name;
+ const u32 *pinmux;
+ unsigned int *pins;
+ unsigned int num_pins;
+};
+
+struct amb_pinctrl_soc_data {
+ struct device *dev;
+ const struct amb_pinctrl_data *data;
+ void __iomem *iomux_base;
+ struct regmap *ds_regmap;
+ struct regmap *pull_regmap;
+ unsigned int npins;
+ unsigned long used[BITS_TO_LONGS(AMBA_MAX_PINS)];
+ raw_spinlock_t lock;
+
+ struct pinctrl_dev *pctl;
+
+ const struct ambpin_function *functions;
+ unsigned int nr_functions;
+ struct ambpin_group *groups;
+ unsigned int nr_groups;
+
+ struct amb_pinctrl_pm_state pm[AMBA_MAX_BANKS];
+};
+
+/* check if the selector is a valid pin group selector */
+static int amb_get_group_count(struct pinctrl_dev *pctldev)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+
+ return soc->nr_groups;
+}
+
+/* return the name of the group selected by the group selector */
+static const char *amb_get_group_name(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+
+ return soc->groups[selector].name;
+}
+
+/* return the pin numbers associated with the specified group */
+static int amb_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned int selector, const unsigned int **pins,
+ unsigned int *num_pins)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+
+ *pins = soc->groups[selector].pins;
+ *num_pins = soc->groups[selector].num_pins;
+
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+static void amb_pin_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned int pin)
+{
+ seq_printf(s, " %s", pinctrl_dev_get_devname(pctldev));
+}
+#endif
+
+/* list of pinctrl callbacks for the pinctrl core */
+static const struct pinctrl_ops amb_pctrl_ops = {
+ .get_groups_count = amb_get_group_count,
+ .get_group_name = amb_get_group_name,
+ .get_group_pins = amb_get_group_pins,
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+ .pin_dbg_show = amb_pin_dbg_show,
+#endif
+ .dt_node_to_map = pinconf_generic_dt_node_to_map_all,
+ .dt_free_map = pinconf_generic_dt_free_map,
+};
+
+/* check if the selector is a valid pin function selector */
+static int amb_pinmux_request(struct pinctrl_dev *pctldev, unsigned int pin)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+
+ if (test_and_set_bit(pin, soc->used))
+ return -EBUSY;
+
+ return 0;
+}
+
+/* check if the selector is a valid pin function selector */
+static int amb_pinmux_free(struct pinctrl_dev *pctldev, unsigned int pin)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+
+ clear_bit(pin, soc->used);
+
+ return 0;
+}
+
+/* check if the selector is a valid pin function selector */
+static int amb_pinmux_get_fcount(struct pinctrl_dev *pctldev)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+
+ return soc->nr_functions;
+}
+
+/* return the name of the pin function specified */
+static const char *amb_pinmux_get_fname(struct pinctrl_dev *pctldev,
+ unsigned int selector)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+
+ return soc->functions[selector].name;
+}
+
+/* return the groups associated for the specified function selector */
+static int amb_pinmux_get_groups(struct pinctrl_dev *pctldev,
+ unsigned int selector,
+ const char * const **groups,
+ unsigned int * const num_groups)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+
+ *groups = soc->functions[selector].groups;
+ *num_groups = soc->functions[selector].num_groups;
+
+ return 0;
+}
+
+static bool amb_iomux_accessible(const struct amb_pinctrl_soc_data *soc)
+{
+ return soc->data->hsm_domain_id == 0;
+}
+
+static void amb_iomux_commit(struct amb_pinctrl_soc_data *soc)
+{
+ if (!amb_iomux_accessible(soc))
+ return;
+
+ writel_relaxed(0x1, soc->iomux_base + IOMUX_CTRL_SET_OFFSET);
+ writel_relaxed(0x0, soc->iomux_base + IOMUX_CTRL_SET_OFFSET);
+}
+
+static void amb_iomux_save_bank(struct amb_pinctrl_soc_data *soc, u32 bank)
+{
+ if (!amb_iomux_accessible(soc) || bank >= AMBA_MAX_BANKS)
+ return;
+
+ soc->pm[bank].iomux[0] =
+ readl_relaxed(soc->iomux_base + IOMUX_OFFSET(bank, 0));
+ soc->pm[bank].iomux[1] =
+ readl_relaxed(soc->iomux_base + IOMUX_OFFSET(bank, 1));
+ soc->pm[bank].iomux[2] =
+ readl_relaxed(soc->iomux_base + IOMUX_OFFSET(bank, 2));
+}
+
+static void amb_iomux_restore_bank(struct amb_pinctrl_soc_data *soc, u32 bank)
+{
+ if (!amb_iomux_accessible(soc) || bank >= AMBA_MAX_BANKS)
+ return;
+
+ writel_relaxed(soc->pm[bank].iomux[0],
+ soc->iomux_base + IOMUX_OFFSET(bank, 0));
+ writel_relaxed(soc->pm[bank].iomux[1],
+ soc->iomux_base + IOMUX_OFFSET(bank, 1));
+ writel_relaxed(soc->pm[bank].iomux[2],
+ soc->iomux_base + IOMUX_OFFSET(bank, 2));
+}
+
+static void amb_pinmux_set_altfunc(struct amb_pinctrl_soc_data *soc,
+ u32 bank, u32 offset, u32 altfunc)
+{
+ u32 i, data;
+
+ if (!amb_iomux_accessible(soc))
+ return;
+
+ for (i = 0; i < 3; i++) {
+ data = readl_relaxed(soc->iomux_base + IOMUX_OFFSET(bank, i));
+ data &= ~BIT(offset);
+ data |= ((altfunc >> i) & 1U) << offset;
+ writel_relaxed(data, soc->iomux_base + IOMUX_OFFSET(bank, i));
+ }
+}
+
+/* enable a specified pinmux by writing to registers */
+static int amb_pinmux_set_mux(struct pinctrl_dev *pctldev,
+ unsigned int selector, unsigned int group)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+ const struct ambpin_group *grp;
+ u32 i, pin, alt, bank, offset;
+ unsigned long flags;
+
+ grp = &soc->groups[group];
+
+ raw_spin_lock_irqsave(&soc->lock, flags);
+ for (i = 0; i < grp->num_pins; i++) {
+ pin = AMBA_PINMUX_TO_PIN(grp->pinmux[i]);
+ alt = AMBA_PINMUX_TO_ALT(grp->pinmux[i]);
+ bank = PINID_TO_BANK(pin);
+ offset = PINID_TO_OFFSET(pin);
+ amb_pinmux_set_altfunc(soc, bank, offset, alt);
+ }
+ /* One commit after the whole group is programmed. */
+ amb_iomux_commit(soc);
+ raw_spin_unlock_irqrestore(&soc->lock, flags);
+
+ return 0;
+}
+
+static int amb_pinmux_gpio_request_enable(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned int pin)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+ u32 bank, offset;
+ unsigned long flags;
+
+ if (!range || !range->gc) {
+ dev_err(soc->dev, "invalid range: %p\n", range);
+ return -EINVAL;
+ }
+
+ if (test_and_set_bit(pin, soc->used))
+ return -EBUSY;
+
+ bank = PINID_TO_BANK(pin);
+ offset = PINID_TO_OFFSET(pin);
+
+ raw_spin_lock_irqsave(&soc->lock, flags);
+ amb_pinmux_set_altfunc(soc, bank, offset, 0);
+ amb_iomux_commit(soc);
+ raw_spin_unlock_irqrestore(&soc->lock, flags);
+
+ return 0;
+}
+
+static void amb_pinmux_gpio_disable_free(struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned int pin)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+
+ dev_dbg(soc->dev, "disable pin %u as GPIO\n", pin);
+ /* Set the pin to some default state, GPIO is usually default */
+
+ clear_bit(pin, soc->used);
+}
+
+/* list of pinmux callbacks for the pinmux vertical in pinctrl core */
+static const struct pinmux_ops amb_pinmux_ops = {
+ .request = amb_pinmux_request,
+ .free = amb_pinmux_free,
+ .get_functions_count = amb_pinmux_get_fcount,
+ .get_function_name = amb_pinmux_get_fname,
+ .get_function_groups = amb_pinmux_get_groups,
+ .set_mux = amb_pinmux_set_mux,
+ .gpio_request_enable = amb_pinmux_gpio_request_enable,
+ .gpio_disable_free = amb_pinmux_gpio_disable_free,
+};
+
+static int amb_drive_strength_to_reg(struct amb_pinctrl_soc_data *soc,
+ u32 strength)
+{
+ if (soc->data->have_ds2) {
+ switch (strength) {
+ case 3:
+ return 0;
+ case 4:
+ case 5:
+ return 1;
+ case 6:
+ return 2;
+ case 7:
+ case 8:
+ return 3;
+ case 9:
+ return 4;
+ case 12:
+ return 5;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ switch (strength) {
+ case 2:
+ return 0;
+ case 4:
+ return 1;
+ case 8:
+ return 2;
+ case 12:
+ return 3;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int amb_reg_to_drive_strength(struct amb_pinctrl_soc_data *soc, u32 ds)
+{
+ static const int ds2_ma[] = { 3, 4, 6, 8, 9, 12 };
+ static const int ds_ma[] = { 2, 4, 8, 12 };
+
+ if (soc->data->have_ds2) {
+ if (ds >= ARRAY_SIZE(ds2_ma))
+ return -EINVAL;
+
+ return ds2_ma[ds];
+ }
+
+ if (ds >= ARRAY_SIZE(ds_ma))
+ return -EINVAL;
+
+ return ds_ma[ds];
+}
+
+/* set the pin config settings for a specified pin */
+static int amb_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
+ unsigned long *configs, unsigned int num_configs)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+ u32 i, bank, offset;
+ unsigned long config;
+ enum pin_config_param param;
+ u32 arg;
+ int ds;
+
+ bank = PINID_TO_BANK(pin);
+ if (bank >= soc->data->nr_banks)
+ return -EINVAL;
+
+ offset = PINID_TO_OFFSET(pin);
+
+ for (i = 0; i < num_configs; i++) {
+ config = configs[i];
+ param = pinconf_to_config_param(config);
+ arg = pinconf_to_config_argument(config);
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ regmap_update_bits(soc->pull_regmap,
+ soc->data->pull_en[bank], BIT(offset), 0);
+ break;
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ case PIN_CONFIG_BIAS_PULL_UP:
+ regmap_update_bits(soc->pull_regmap, soc->data->pull_dir[bank],
+ BIT(offset),
+ (param == PIN_CONFIG_BIAS_PULL_UP) ?
+ BIT(offset) : 0);
+ regmap_update_bits(soc->pull_regmap, soc->data->pull_en[bank],
+ BIT(offset), BIT(offset));
+ break;
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ ds = amb_drive_strength_to_reg(soc, arg);
+ if (ds < 0)
+ return ds;
+ if (soc->data->have_ds2) {
+ regmap_update_bits(soc->ds_regmap,
+ soc->data->ds0[bank], BIT(offset),
+ (ds & BIT(0)) ? BIT(offset) : 0);
+ regmap_update_bits(soc->ds_regmap,
+ soc->data->ds1[bank], BIT(offset),
+ (ds & BIT(1)) ? BIT(offset) : 0);
+ regmap_update_bits(soc->ds_regmap,
+ soc->data->ds2[bank], BIT(offset),
+ (ds & BIT(2)) ? BIT(offset) : 0);
+ } else {
+ regmap_update_bits(soc->ds_regmap,
+ soc->data->ds0[bank], BIT(offset),
+ (ds & BIT(1)) ? BIT(offset) : 0);
+ regmap_update_bits(soc->ds_regmap,
+ soc->data->ds1[bank], BIT(offset),
+ (ds & BIT(0)) ? BIT(offset) : 0);
+ }
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+ }
+
+ return 0;
+}
+
+static int amb_pinconf_group_set(struct pinctrl_dev *pctldev,
+ unsigned int selector,
+ unsigned long *configs,
+ unsigned int num_configs)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+ const struct ambpin_group *grp = &soc->groups[selector];
+ int ret;
+ u32 i;
+
+ for (i = 0; i < grp->num_pins; i++) {
+ ret = amb_pinconf_set(pctldev, grp->pins[i], configs,
+ num_configs);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/* get the pin config settings for a specified pin */
+static int amb_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned long *config)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+ enum pin_config_param param = pinconf_to_config_param(*config);
+ u32 bank, offset, pull_en, pull_dir, ds0, ds1, ds2, ds;
+ int ret, strength;
+
+ bank = PINID_TO_BANK(pin);
+ if (bank >= soc->data->nr_banks)
+ return -EINVAL;
+
+ offset = PINID_TO_OFFSET(pin);
+
+ switch (param) {
+ case PIN_CONFIG_BIAS_DISABLE:
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ case PIN_CONFIG_BIAS_PULL_UP:
+ ret = regmap_read(soc->pull_regmap, soc->data->pull_en[bank],
+ &pull_en);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(soc->pull_regmap, soc->data->pull_dir[bank],
+ &pull_dir);
+ if (ret)
+ return ret;
+
+ pull_en = (pull_en >> offset) & 1;
+ pull_dir = (pull_dir >> offset) & 1;
+
+ if (param == PIN_CONFIG_BIAS_DISABLE) {
+ if (pull_en)
+ return -EINVAL;
+ *config = pinconf_to_config_packed(param, 0);
+ return 0;
+ }
+
+ if (!pull_en)
+ return -EINVAL;
+ if (param == PIN_CONFIG_BIAS_PULL_UP && !pull_dir)
+ return -EINVAL;
+ if (param == PIN_CONFIG_BIAS_PULL_DOWN && pull_dir)
+ return -EINVAL;
+
+ *config = pinconf_to_config_packed(param, 1);
+ return 0;
+
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ ret = regmap_read(soc->ds_regmap, soc->data->ds0[bank], &ds0);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(soc->ds_regmap, soc->data->ds1[bank], &ds1);
+ if (ret)
+ return ret;
+
+ ds0 = (ds0 >> offset) & 1;
+ ds1 = (ds1 >> offset) & 1;
+ if (soc->data->have_ds2) {
+ ret = regmap_read(soc->ds_regmap, soc->data->ds2[bank], &ds2);
+ if (ret)
+ return ret;
+
+ ds2 = (ds2 >> offset) & 1;
+ ds = (ds2 << 2) | (ds1 << 1) | ds0;
+ } else {
+ ds = (ds0 << 1) | ds1;
+ }
+
+ strength = amb_reg_to_drive_strength(soc, ds);
+ if (strength < 0)
+ return strength;
+
+ *config = pinconf_to_config_packed(param, strength);
+ return 0;
+
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+static void amb_pinconf_dbg_show(struct pinctrl_dev *pctldev,
+ struct seq_file *s, unsigned int pin)
+{
+ struct amb_pinctrl_soc_data *soc = pinctrl_dev_get_drvdata(pctldev);
+ u32 pull_en, pull_dir, ds0, ds1, ds2 = 0, ds;
+ u32 bank, offset;
+ int strength, ret;
+
+ bank = PINID_TO_BANK(pin);
+ if (bank >= soc->data->nr_banks) {
+ seq_puts(s, " (no pinconf)");
+ return;
+ }
+
+ offset = PINID_TO_OFFSET(pin);
+
+ ret = regmap_read(soc->pull_regmap, soc->data->pull_en[bank],
+ &pull_en);
+ if (ret) {
+ seq_puts(s, " pull: <read error>");
+ return;
+ }
+ ret = regmap_read(soc->pull_regmap, soc->data->pull_dir[bank],
+ &pull_dir);
+ if (ret) {
+ seq_puts(s, " pull: <read error>");
+ return;
+ }
+ pull_en = (pull_en >> offset) & 1;
+ pull_dir = (pull_dir >> offset) & 1;
+ seq_printf(s, " pull: %s,",
+ pull_en ? (pull_dir ? "up" : "down") : "disable");
+
+ ret = regmap_read(soc->ds_regmap, soc->data->ds0[bank], &ds0);
+ if (ret) {
+ seq_puts(s, " drive-strength: <read error>");
+ return;
+ }
+ ret = regmap_read(soc->ds_regmap, soc->data->ds1[bank], &ds1);
+ if (ret) {
+ seq_puts(s, " drive-strength: <read error>");
+ return;
+ }
+ ds0 = (ds0 >> offset) & 1;
+ ds1 = (ds1 >> offset) & 1;
+ if (soc->data->have_ds2) {
+ ret = regmap_read(soc->ds_regmap, soc->data->ds2[bank], &ds2);
+ if (ret) {
+ seq_puts(s, " drive-strength: <read error>");
+ return;
+ }
+ ds2 = (ds2 >> offset) & 1;
+ ds = (ds2 << 2) | (ds1 << 1) | ds0;
+ } else {
+ ds = (ds0 << 1) | ds1;
+ }
+
+ strength = amb_reg_to_drive_strength(soc, ds);
+ if (strength < 0)
+ seq_puts(s, " drive-strength: invalid");
+ else
+ seq_printf(s, " drive-strength: %dmA", strength);
+}
+#endif
+
+/* list of pinconfig callbacks for pinconfig vertical in the pinctrl code */
+static const struct pinconf_ops amb_pinconf_ops = {
+ .is_generic = true,
+ .pin_config_get = amb_pinconf_get,
+ .pin_config_set = amb_pinconf_set,
+ .pin_config_group_set = amb_pinconf_group_set,
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+ .pin_config_dbg_show = amb_pinconf_dbg_show,
+#endif
+};
+
+/* register the pinctrl interface with the pinctrl subsystem */
+static int amb_pinctrl_register(struct amb_pinctrl_soc_data *soc)
+{
+ struct pinctrl_pin_desc *pindesc;
+ struct pinctrl_desc *amb_pinctrl_desc;
+ unsigned int pin;
+
+ /* dynamically populate the pin number and pin name for pindesc */
+ pindesc = devm_kcalloc(soc->dev, soc->npins, sizeof(*pindesc),
+ GFP_KERNEL);
+ if (!pindesc)
+ return -ENOMEM;
+
+ for (pin = 0; pin < soc->npins; pin++) {
+ pindesc[pin].number = pin;
+ pindesc[pin].name = devm_kasprintf(soc->dev, GFP_KERNEL,
+ "io%u", pin);
+ if (!pindesc[pin].name)
+ return -ENOMEM;
+ }
+
+ amb_pinctrl_desc = devm_kzalloc(soc->dev, sizeof(*amb_pinctrl_desc), GFP_KERNEL);
+ if (!amb_pinctrl_desc)
+ return -ENOMEM;
+
+ amb_pinctrl_desc->name = dev_name(soc->dev);
+ amb_pinctrl_desc->pins = pindesc;
+ amb_pinctrl_desc->npins = soc->npins;
+ amb_pinctrl_desc->pctlops = &amb_pctrl_ops;
+ amb_pinctrl_desc->pmxops = &amb_pinmux_ops;
+ amb_pinctrl_desc->confops = &amb_pinconf_ops;
+ amb_pinctrl_desc->owner = THIS_MODULE;
+
+ soc->pctl = devm_pinctrl_register(soc->dev, amb_pinctrl_desc, soc);
+ if (IS_ERR(soc->pctl)) {
+ dev_err(soc->dev, "could not register pinctrl driver\n");
+ return PTR_ERR(soc->pctl);
+ }
+
+ return 0;
+}
+
+static int amb_pinctrl_probe(struct platform_device *pdev)
+{
+ struct amb_pinctrl_soc_data *soc;
+ struct device_node *np;
+ unsigned int *group_pins;
+ unsigned int group, group_pin;
+ size_t nr_group_pins = 0;
+ int rval;
+
+ soc = devm_kzalloc(&pdev->dev, sizeof(*soc), GFP_KERNEL);
+ if (!soc)
+ return -ENOMEM;
+
+ soc->dev = &pdev->dev;
+ soc->data = of_device_get_match_data(&pdev->dev);
+ if (!soc->data)
+ return dev_err_probe(&pdev->dev, -EINVAL, "missing soc data");
+ if (!soc->data->nr_banks ||
+ soc->data->nr_banks > AMBA_MAX_BANKS ||
+ !soc->data->npins ||
+ soc->data->npins > AMBA_MAX_PINS ||
+ soc->data->nr_banks * 32 > soc->data->npins ||
+ soc->data->clk_au_dedicated_pin >= soc->data->npins ||
+ PINID_TO_BANK(soc->data->clk_au_dedicated_pin) >= AMBA_MAX_BANKS)
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "invalid bank or pin count\n");
+
+ soc->npins = soc->data->npins;
+
+ np = pdev->dev.of_node;
+ soc->iomux_base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(soc->iomux_base))
+ return dev_err_probe(&pdev->dev, PTR_ERR(soc->iomux_base),
+ "couldn't get iomux reg");
+
+ soc->ds_regmap = syscon_regmap_lookup_by_phandle(np, "ambarella,drive-strength-syscon");
+ if (IS_ERR(soc->ds_regmap))
+ return dev_err_probe(&pdev->dev, PTR_ERR(soc->ds_regmap),
+ "couldn't get drive-strength regmap");
+
+ soc->pull_regmap = syscon_regmap_lookup_by_phandle(np, "ambarella,pull-syscon");
+ if (IS_ERR(soc->pull_regmap))
+ return dev_err_probe(&pdev->dev, PTR_ERR(soc->pull_regmap),
+ "couldn't get pull regmap");
+
+ soc->nr_groups = soc->data->nr_groups;
+ soc->functions = soc->data->functions;
+ soc->nr_functions = soc->data->nr_functions;
+ if (!soc->data->groups || !soc->nr_groups ||
+ !soc->functions || !soc->nr_functions)
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "missing pin groups or functions\n");
+
+ soc->groups = devm_kcalloc(&pdev->dev, soc->nr_groups,
+ sizeof(*soc->groups), GFP_KERNEL);
+ if (!soc->groups)
+ return -ENOMEM;
+
+ for (group = 0; group < soc->nr_groups; group++) {
+ const struct ambpin_group_desc *desc =
+ &soc->data->groups[group];
+
+ if (!desc->name || !desc->pinmux || !desc->num_pins)
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "invalid pin group %u\n", group);
+
+ nr_group_pins += desc->num_pins;
+ }
+
+ group_pins = devm_kcalloc(&pdev->dev, nr_group_pins,
+ sizeof(*group_pins), GFP_KERNEL);
+ if (!group_pins)
+ return -ENOMEM;
+
+ for (group = 0; group < soc->nr_groups; group++) {
+ const struct ambpin_group_desc *desc =
+ &soc->data->groups[group];
+ struct ambpin_group *grp = &soc->groups[group];
+
+ grp->name = desc->name;
+ grp->pinmux = desc->pinmux;
+ grp->pins = group_pins;
+ grp->num_pins = desc->num_pins;
+ for (group_pin = 0;
+ group_pin < grp->num_pins;
+ group_pin++) {
+ u32 pinmux = grp->pinmux[group_pin];
+ unsigned int pin = AMBA_PINMUX_TO_PIN(pinmux);
+ unsigned int alt = AMBA_PINMUX_TO_ALT(pinmux);
+
+ if (pin >= soc->npins || alt > 7)
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "group %s has invalid pinmux %#x\n",
+ grp->name, pinmux);
+
+ grp->pins[group_pin] = pin;
+ }
+ group_pins += grp->num_pins;
+ }
+
+ raw_spin_lock_init(&soc->lock);
+
+ /* Mark all pins unavailable, then clear pins that exist. */
+ bitmap_fill(soc->used, AMBA_MAX_PINS);
+ bitmap_clear(soc->used, 0, soc->data->nr_banks * 32);
+ clear_bit(soc->data->clk_au_dedicated_pin, soc->used);
+
+ rval = amb_pinctrl_register(soc);
+ if (rval)
+ return dev_err_probe(&pdev->dev, rval, "pinctrl register failed!");
+
+ platform_set_drvdata(pdev, soc);
+ dev_info(&pdev->dev, "Ambarella pinctrl driver registered");
+
+ return 0;
+}
+
+static int amb_pinctrl_suspend(struct device *dev)
+{
+ struct amb_pinctrl_soc_data *soc = dev_get_drvdata(dev);
+ u32 bank, dedicated = soc->data->clk_au_dedicated_pin;
+
+ for (bank = 0; bank < soc->data->nr_banks; bank++) {
+ regmap_read(soc->pull_regmap, soc->data->pull_en[bank],
+ &soc->pm[bank].pull[0]);
+ regmap_read(soc->pull_regmap, soc->data->pull_dir[bank],
+ &soc->pm[bank].pull[1]);
+
+ regmap_read(soc->ds_regmap, soc->data->ds0[bank],
+ &soc->pm[bank].ds[0]);
+ regmap_read(soc->ds_regmap, soc->data->ds1[bank],
+ &soc->pm[bank].ds[1]);
+ if (soc->data->have_ds2)
+ regmap_read(soc->ds_regmap, soc->data->ds2[bank],
+ &soc->pm[bank].ds[2]);
+
+ amb_iomux_save_bank(soc, bank);
+ }
+
+ if (dedicated >= soc->data->nr_banks * 32)
+ amb_iomux_save_bank(soc, PINID_TO_BANK(dedicated));
+
+ return 0;
+}
+
+static int amb_pinctrl_resume(struct device *dev)
+{
+ struct amb_pinctrl_soc_data *soc = dev_get_drvdata(dev);
+ u32 bank, dedicated = soc->data->clk_au_dedicated_pin;
+
+ for (bank = 0; bank < soc->data->nr_banks; bank++)
+ amb_iomux_restore_bank(soc, bank);
+
+ if (dedicated >= soc->data->nr_banks * 32)
+ amb_iomux_restore_bank(soc, PINID_TO_BANK(dedicated));
+
+ /* Ensure restored IOMUX writes land before the commit strobe. */
+ wmb();
+ amb_iomux_commit(soc);
+
+ for (bank = 0; bank < soc->data->nr_banks; bank++) {
+ regmap_write(soc->ds_regmap, soc->data->ds0[bank],
+ soc->pm[bank].ds[0]);
+ regmap_write(soc->ds_regmap, soc->data->ds1[bank],
+ soc->pm[bank].ds[1]);
+ if (soc->data->have_ds2)
+ regmap_write(soc->ds_regmap, soc->data->ds2[bank],
+ soc->pm[bank].ds[2]);
+
+ regmap_write(soc->pull_regmap, soc->data->pull_dir[bank],
+ soc->pm[bank].pull[1]);
+ regmap_write(soc->pull_regmap, soc->data->pull_en[bank],
+ soc->pm[bank].pull[0]);
+ }
+
+ return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(amb_pinctrl_pm_ops,
+ amb_pinctrl_suspend,
+ amb_pinctrl_resume);
+
+static const struct of_device_id amb_pinctrl_dt_match[] = {
+ {
+ .compatible = "ambarella,cv75-pinctrl",
+ .data = &ambarella_cv75_pinctrl_data,
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, amb_pinctrl_dt_match);
+
+static struct platform_driver amb_pinctrl_driver = {
+ .probe = amb_pinctrl_probe,
+ .driver = {
+ .name = "ambarella-pinctrl",
+ .of_match_table = of_match_ptr(amb_pinctrl_dt_match),
+ .pm = pm_sleep_ptr(&amb_pinctrl_pm_ops),
+ },
+};
+
+static int __init amb_pinctrl_drv_register(void)
+{
+ return platform_driver_register(&amb_pinctrl_driver);
+}
+arch_initcall(amb_pinctrl_drv_register);
+
+MODULE_AUTHOR("Cao Rongrong <rrcao@ambarella.com>");
+MODULE_DESCRIPTION("Ambarella SoC pinctrl driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/pinctrl/pinctrl-ambarella.h b/drivers/pinctrl/pinctrl-ambarella.h
new file mode 100644
index 000000000000..094639627131
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-ambarella.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Ambarella pinctrl common data definitions
+ *
+ * Copyright (C) 2012-2026, Ambarella, Inc.
+ */
+
+#ifndef _PINCTRL_AMBARELLA_H
+#define _PINCTRL_AMBARELLA_H
+
+#include <linux/types.h>
+
+#define AMBA_MAX_BANKS 8
+
+#define AMBA_PINMUX(pin, alt) (((alt) << 12) | (pin))
+#define AMBA_PINMUX_TO_PIN(mux) ((mux) & 0xfff)
+#define AMBA_PINMUX_TO_ALT(mux) (((mux) >> 12) & 0xf)
+
+struct ambpin_group_desc {
+ const char *name;
+ const u32 *pinmux;
+ unsigned int num_pins;
+};
+
+struct ambpin_function {
+ const char *name;
+ const char * const *groups;
+ unsigned int num_groups;
+};
+
+struct amb_pinctrl_data {
+ unsigned int ds0[AMBA_MAX_BANKS];
+ unsigned int ds1[AMBA_MAX_BANKS];
+ unsigned int ds2[AMBA_MAX_BANKS];
+ unsigned int pull_en[AMBA_MAX_BANKS];
+ unsigned int pull_dir[AMBA_MAX_BANKS];
+ bool have_ds2;
+ u32 hsm_domain_id;
+ u32 clk_au_dedicated_pin;
+ unsigned int nr_banks;
+ unsigned int npins;
+ const struct ambpin_group_desc *groups;
+ unsigned int nr_groups;
+ const struct ambpin_function *functions;
+ unsigned int nr_functions;
+};
+
+extern const struct amb_pinctrl_data ambarella_cv75_pinctrl_data;
+
+#endif /* _PINCTRL_AMBARELLA_H */
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread* [PATCH v5 10/12] serial: 8250: add Ambarella UART driver
2026-08-18 10:31 [PATCH v5 00/12] Ambarella CV75 SoC minimal bring-up Long Zhao via B4 Relay
` (8 preceding siblings ...)
2026-08-18 10:31 ` [PATCH v5 09/12] pinctrl: ambarella: add CV75 pin controller Long Zhao via B4 Relay
@ 2026-08-18 10:31 ` Long Zhao via B4 Relay
2026-08-18 14:17 ` Andy Shevchenko
2026-08-18 10:31 ` [PATCH v5 11/12] arm64: ambarella: add ARCH_AMBARELLA and CV75 EVK DT Long Zhao via B4 Relay
2026-08-18 10:31 ` [PATCH v5 12/12] MAINTAINERS: add ARM/AMBARELLA SoC support Long Zhao via B4 Relay
11 siblings, 1 reply; 15+ messages in thread
From: Long Zhao via B4 Relay @ 2026-08-18 10:31 UTC (permalink / raw)
To: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Michael Turquette,
Stephen Boyd, Linus Walleij, Bartosz Golaszewski,
Greg Kroah-Hartman, Jiri Slaby, Andy Shevchenko, Catalin Marinas,
Will Deacon, devicetree, linux-clk, linux-gpio, linux-serial,
linux-kernel, Brian Masney, Lee Jones, mfd, Long Zhao, Long Zhao
From: Long Zhao <longzhao@ambarella.com>
Add an 8250 platform driver for Ambarella CV75 instead of claiming
snps,dw-apb-uart compatibility.
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
drivers/tty/serial/8250/8250_ambarella.c | 312 +++++++++++++++++++++++++++++++
drivers/tty/serial/8250/Kconfig | 9 +
drivers/tty/serial/8250/Makefile | 1 +
3 files changed, 322 insertions(+)
diff --git a/drivers/tty/serial/8250/8250_ambarella.c b/drivers/tty/serial/8250/8250_ambarella.c
new file mode 100644
index 000000000000..951355e19fa2
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_ambarella.c
@@ -0,0 +1,312 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Serial port driver for Ambarella UART
+ *
+ * Copyright (C) 2026 Ambarella, Inc.
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/serial_8250.h>
+#include <linux/serial_reg.h>
+
+#include "8250.h"
+
+#define AMBARELLA_UART_IER_ETOI BIT(5)
+#define AMBARELLA_UART_USR 0x1f
+#define AMBARELLA_UART_USR_BUSY BIT(0)
+#define AMBARELLA_UART_IIR_IID GENMASK(3, 0)
+#define AMBARELLA_UART_IIR_STATUS GENMASK(5, 0)
+
+struct ambarella_uart_soc_data {
+ unsigned int fifo_size;
+};
+
+struct ambarella_uart {
+ int line;
+ struct clk *clk;
+ const struct ambarella_uart_soc_data *soc_data;
+ bool in_idle;
+};
+
+static void ambarella_idle_exit(struct uart_port *p)
+{
+ struct ambarella_uart *data = p->private_data;
+ struct uart_8250_port *up = up_to_u8250p(p);
+
+ if (up->capabilities & UART_CAP_FIFO)
+ writel(up->fcr, p->membase + (UART_FCR << p->regshift));
+ writel(up->mcr, p->membase + (UART_MCR << p->regshift));
+ writel(up->ier, p->membase + (UART_IER << p->regshift));
+
+ data->in_idle = false;
+}
+
+static int ambarella_idle_enter(struct uart_port *p)
+{
+ struct ambarella_uart *data = p->private_data;
+ struct uart_8250_port *up = up_to_u8250p(p);
+ unsigned int status;
+ int retries = 4;
+
+ lockdep_assert_held_once(&p->lock);
+
+ data->in_idle = true;
+ writel(0, p->membase + (UART_IER << p->regshift));
+
+ serial8250_fifo_wait_for_lsr_thre(up, p->fifosize);
+ ndelay(p->frame_time);
+ writel(up->mcr | UART_MCR_LOOP,
+ p->membase + (UART_MCR << p->regshift));
+
+ do {
+ serial8250_clear_fifos(up);
+ if (!(readl(p->membase +
+ (AMBARELLA_UART_USR << p->regshift)) &
+ AMBARELLA_UART_USR_BUSY))
+ break;
+ ndelay(p->frame_time);
+ } while (--retries);
+
+ status = serial_lsr_in(up);
+ if (status & UART_LSR_DR) {
+ readl(p->membase + (UART_RX << p->regshift));
+ up->lsr_saved_flags = 0;
+ }
+
+ if (readl(p->membase + (AMBARELLA_UART_USR << p->regshift)) &
+ AMBARELLA_UART_USR_BUSY) {
+ ambarella_idle_exit(p);
+ return -EBUSY;
+ }
+
+ return 0;
+}
+
+static void ambarella_serial_out(struct uart_port *p, unsigned int offset,
+ u32 value)
+{
+ struct ambarella_uart *data = p->private_data;
+ u32 lcr;
+
+ if (offset != UART_LCR || !data || data->in_idle) {
+ writel(value, p->membase + (offset << p->regshift));
+ return;
+ }
+
+ lcr = readl(p->membase + (UART_LCR << p->regshift));
+ if (lcr == value)
+ return;
+
+ writel(value, p->membase + (UART_LCR << p->regshift));
+ lcr = readl(p->membase + (UART_LCR << p->regshift));
+ if ((lcr & ~UART_LCR_SPAR) == (value & ~UART_LCR_SPAR))
+ return;
+
+ if (ambarella_idle_enter(p))
+ return;
+
+ writel(value, p->membase + (UART_LCR << p->regshift));
+ ambarella_idle_exit(p);
+}
+
+static u32 ambarella_serial_in(struct uart_port *p, unsigned int offset)
+{
+ return readl(p->membase + (offset << p->regshift));
+}
+
+static int ambarella_handle_irq(struct uart_port *p)
+{
+ struct uart_8250_port *up = up_to_u8250p(p);
+ unsigned int iir = serial_port_in(p, UART_IIR);
+ bool rx_timeout = (iir & AMBARELLA_UART_IIR_STATUS) ==
+ UART_IIR_RX_TIMEOUT;
+ unsigned int status;
+
+ guard(uart_port_lock_check_sysrq_irqsave)(p);
+
+ switch (FIELD_GET(AMBARELLA_UART_IIR_IID, iir)) {
+ case UART_IIR_NO_INT:
+ return 0;
+ case UART_IIR_BUSY:
+ serial_port_in(p, AMBARELLA_UART_USR);
+ return 1;
+ }
+
+ if (rx_timeout) {
+ status = serial_lsr_in(up);
+ if (!(status & (UART_LSR_DR | UART_LSR_BI)))
+ serial_port_in(p, UART_RX);
+ }
+
+ serial8250_handle_irq_locked(p, iir);
+ return 1;
+}
+
+static void ambarella_set_divisor(struct uart_port *p, unsigned int baud,
+ unsigned int quot, unsigned int quot_frac)
+{
+ struct uart_8250_port *up = up_to_u8250p(p);
+
+ if (ambarella_idle_enter(p))
+ return;
+
+ serial_port_out(p, UART_LCR, up->lcr | UART_LCR_DLAB);
+ if (serial_port_in(p, UART_LCR) & UART_LCR_DLAB)
+ serial_dl_write(up, quot);
+ serial_port_out(p, UART_LCR, up->lcr);
+
+ ambarella_idle_exit(p);
+}
+
+static int ambarella_startup(struct uart_port *port)
+{
+ struct uart_8250_port *up = up_to_u8250p(port);
+ int ret;
+
+ ret = serial8250_do_startup(port);
+ if (ret)
+ return ret;
+
+ up->ier |= AMBARELLA_UART_IER_ETOI;
+ serial_port_out(port, UART_IER, up->ier);
+
+ return 0;
+}
+
+static int ambarella_uart_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ambarella_uart *data;
+ struct uart_8250_port uart = {};
+ struct resource *regs;
+ u32 reg_io_width = 4;
+ u32 reg_shift = 2;
+ int irq, ret;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs)
+ return dev_err_probe(dev, -EINVAL, "missing registers\n");
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->soc_data = device_get_match_data(dev);
+ if (!data->soc_data)
+ return -EINVAL;
+
+ data->clk = devm_clk_get_enabled(dev, NULL);
+ if (IS_ERR(data->clk))
+ return dev_err_probe(dev, PTR_ERR(data->clk),
+ "unable to get clock\n");
+
+ uart.port.dev = dev;
+ uart.port.mapbase = regs->start;
+ uart.port.mapsize = resource_size(regs);
+ uart.port.membase = devm_ioremap(dev, regs->start,
+ resource_size(regs));
+ if (!uart.port.membase)
+ return -ENOMEM;
+
+ uart.port.irq = irq;
+ uart.port.type = PORT_16550A;
+ uart.port.flags = UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_SKIP_TEST;
+ uart.port.startup = ambarella_startup;
+ uart.port.handle_irq = ambarella_handle_irq;
+ uart.port.set_divisor = ambarella_set_divisor;
+ uart.port.uartclk = clk_get_rate(data->clk);
+ if (!uart.port.uartclk)
+ return dev_err_probe(dev, -EINVAL, "clock rate not defined\n");
+
+ uart.port.fifosize = data->soc_data->fifo_size;
+ uart.port.private_data = data;
+ uart.capabilities = UART_CAP_FIFO | UART_CAP_NOTEMT | UART_CAP_AFE;
+
+ of_property_read_u32(dev->of_node, "reg-shift", ®_shift);
+ of_property_read_u32(dev->of_node, "reg-io-width", ®_io_width);
+ uart.port.regshift = reg_shift;
+
+ switch (reg_io_width) {
+ case 4:
+ uart.port.iotype = UPIO_MEM32;
+ uart.port.serial_in = ambarella_serial_in;
+ uart.port.serial_out = ambarella_serial_out;
+ break;
+ default:
+ return dev_err_probe(dev, -EINVAL,
+ "unsupported reg-io-width %u\n",
+ reg_io_width);
+ }
+
+ ret = serial8250_register_8250_port(&uart);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "unable to register 8250 port\n");
+
+ data->line = ret;
+ platform_set_drvdata(pdev, data);
+ return 0;
+}
+
+static void ambarella_uart_remove(struct platform_device *pdev)
+{
+ struct ambarella_uart *data = platform_get_drvdata(pdev);
+
+ serial8250_unregister_port(data->line);
+}
+
+static const struct ambarella_uart_soc_data cv75_uart_data = {
+ .fifo_size = 64,
+};
+
+static const struct of_device_id ambarella_uart_dt_ids[] = {
+ {
+ .compatible = "ambarella,cv75-uart",
+ .data = &cv75_uart_data,
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ambarella_uart_dt_ids);
+
+static struct platform_driver ambarella_uart_platform_driver = {
+ .driver = {
+ .name = "8250-ambarella",
+ .of_match_table = ambarella_uart_dt_ids,
+ },
+ .probe = ambarella_uart_probe,
+ .remove = ambarella_uart_remove,
+};
+
+module_platform_driver(ambarella_uart_platform_driver);
+
+static int __init ambarella_early_setup(struct earlycon_device *device,
+ const char *options)
+{
+ struct uart_port *port = &device->port;
+
+ if (!port->membase)
+ return -ENODEV;
+
+ port->iotype = UPIO_MEM32;
+ port->regshift = 2;
+ port->serial_in = ambarella_serial_in;
+ port->serial_out = ambarella_serial_out;
+
+ return early_serial8250_setup(device, options);
+}
+
+OF_EARLYCON_DECLARE(ambarella, "ambarella,cv75-uart", ambarella_early_setup);
+
+MODULE_IMPORT_NS("SERIAL_8250");
+MODULE_AUTHOR("Long Zhao <longzhao@ambarella.com>");
+MODULE_DESCRIPTION("Ambarella UART driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index fc3e58d62233..523c55be3227 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -337,6 +337,15 @@ config SERIAL_8250_ACORN
system, say Y to this option. The driver can handle 1, 2, or 3 port
cards. If unsure, say N.
+config SERIAL_8250_AMBARELLA
+ tristate "Ambarella UART support"
+ depends on SERIAL_8250 && HAVE_CLK
+ depends on ARCH_AMBARELLA || COMPILE_TEST
+ default y if ARCH_AMBARELLA
+ help
+ Support for the on-chip UART found on Ambarella SoCs.
+ If unsure, say N.
+
config SERIAL_8250_BCM2835AUX
tristate "BCM2835 auxiliar mini UART support"
depends on ARCH_BCM2835 || COMPILE_TEST
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index 6d21402b4435..601d9e2589fe 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_SERIAL_8250_CONSOLE) += 8250_early.o
obj-$(CONFIG_SERIAL_8250_ACCENT) += 8250_accent.o
obj-$(CONFIG_SERIAL_8250_ACORN) += 8250_acorn.o
+obj-$(CONFIG_SERIAL_8250_AMBARELLA) += 8250_ambarella.o
obj-$(CONFIG_SERIAL_8250_ASPEED_VUART) += 8250_aspeed_vuart.o
obj-$(CONFIG_SERIAL_8250_BCM2835AUX) += 8250_bcm2835aux.o
obj-$(CONFIG_SERIAL_8250_BCM7271) += 8250_bcm7271.o
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread* Re: [PATCH v5 10/12] serial: 8250: add Ambarella UART driver
2026-08-18 10:31 ` [PATCH v5 10/12] serial: 8250: add Ambarella UART driver Long Zhao via B4 Relay
@ 2026-08-18 14:17 ` Andy Shevchenko
0 siblings, 0 replies; 15+ messages in thread
From: Andy Shevchenko @ 2026-08-18 14:17 UTC (permalink / raw)
To: longzhao
Cc: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel, Rob Herring, Krzysztof Kozlowski, Conor Dooley,
Michael Turquette, Stephen Boyd, Linus Walleij,
Bartosz Golaszewski, Greg Kroah-Hartman, Jiri Slaby,
Catalin Marinas, Will Deacon, devicetree, linux-clk, linux-gpio,
linux-serial, linux-kernel, Brian Masney, Lee Jones, mfd,
Long Zhao
On Tue, Aug 18, 2026 at 06:31:24PM +0800, Long Zhao via B4 Relay wrote:
> Add an 8250 platform driver for Ambarella CV75 instead of claiming
> snps,dw-apb-uart compatibility.
This is a record from a changelog. There is nothing in the commit message.
...
The code seems like an almost blind copy of 8250_dw.c.
> +#define AMBARELLA_UART_USR 0x1f
> +#define AMBARELLA_UART_USR_BUSY BIT(0)
So, is it Synopsys IP-based design? How this gets into this platform? This
whole story completely made me lost.
> +#define AMBARELLA_UART_IIR_IID GENMASK(3, 0)
> +#define AMBARELLA_UART_IIR_STATUS GENMASK(5, 0)
...
> + of_property_read_u32(dev->of_node, "reg-shift", ®_shift);
> + of_property_read_u32(dev->of_node, "reg-io-width", ®_io_width);
> + uart.port.regshift = reg_shift;
> + switch (reg_io_width) {
> + case 4:
> + uart.port.iotype = UPIO_MEM32;
> + uart.port.serial_in = ambarella_serial_in;
> + uart.port.serial_out = ambarella_serial_out;
> + break;
> + default:
> + return dev_err_probe(dev, -EINVAL,
> + "unsupported reg-io-width %u\n",
> + reg_io_width);
> + }
This is handled by uart_read_port_properties().
--
With Best Regards,
Andy Shevchenko
^ permalink raw reply [flat|nested] 15+ messages in thread
* [PATCH v5 11/12] arm64: ambarella: add ARCH_AMBARELLA and CV75 EVK DT
2026-08-18 10:31 [PATCH v5 00/12] Ambarella CV75 SoC minimal bring-up Long Zhao via B4 Relay
` (9 preceding siblings ...)
2026-08-18 10:31 ` [PATCH v5 10/12] serial: 8250: add Ambarella UART driver Long Zhao via B4 Relay
@ 2026-08-18 10:31 ` Long Zhao via B4 Relay
2026-08-18 10:31 ` [PATCH v5 12/12] MAINTAINERS: add ARM/AMBARELLA SoC support Long Zhao via B4 Relay
11 siblings, 0 replies; 15+ messages in thread
From: Long Zhao via B4 Relay @ 2026-08-18 10:31 UTC (permalink / raw)
To: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Michael Turquette,
Stephen Boyd, Linus Walleij, Bartosz Golaszewski,
Greg Kroah-Hartman, Jiri Slaby, Andy Shevchenko, Catalin Marinas,
Will Deacon, devicetree, linux-clk, linux-gpio, linux-serial,
linux-kernel, Brian Masney, Lee Jones, mfd, Long Zhao, Long Zhao
From: Long Zhao <longzhao@ambarella.com>
Enable ARCH_AMBARELLA and add a minimal CV75 SoC / EVK device tree for
console bring-up with the RCT clocks, UART, pinctrl and GPIO banks.
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
arch/arm64/Kconfig.platforms | 8 ++
arch/arm64/boot/dts/Makefile | 1 +
arch/arm64/boot/dts/ambarella/Makefile | 3 +
arch/arm64/boot/dts/ambarella/cv75-evk.dts | 30 +++++
arch/arm64/boot/dts/ambarella/cv75.dtsi | 176 +++++++++++++++++++++++++++++
arch/arm64/configs/defconfig | 2 +
6 files changed, 220 insertions(+)
diff --git a/arch/arm64/Kconfig.platforms b/arch/arm64/Kconfig.platforms
index d2acfac73003..cb05eff267a8 100644
--- a/arch/arm64/Kconfig.platforms
+++ b/arch/arm64/Kconfig.platforms
@@ -26,6 +26,14 @@ config ARCH_SUNXI
help
This enables support for Allwinner sunxi based SoCs like the A64.
+config ARCH_AMBARELLA
+ bool "Ambarella SoC family"
+ select ARM_PSCI
+ select HAVE_ARM_ARCH_TIMER
+ select PINCTRL
+ help
+ This enables support for the ARM64 based Ambarella SoCs like CV75.
+
config ARCH_ALPINE
bool "Annapurna Labs Alpine platform"
select ALPINE_MSI if PCI
diff --git a/arch/arm64/boot/dts/Makefile b/arch/arm64/boot/dts/Makefile
index fc726b215f12..f1709eb5d915 100644
--- a/arch/arm64/boot/dts/Makefile
+++ b/arch/arm64/boot/dts/Makefile
@@ -4,6 +4,7 @@ subdir-y += airoha
subdir-y += allwinner
subdir-y += altera
subdir-y += amazon
+subdir-y += ambarella
subdir-y += amd
subdir-y += amlogic
subdir-y += apm
diff --git a/arch/arm64/boot/dts/ambarella/Makefile b/arch/arm64/boot/dts/ambarella/Makefile
new file mode 100644
index 000000000000..ddca3d7b18cc
--- /dev/null
+++ b/arch/arm64/boot/dts/ambarella/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+dtb-$(CONFIG_ARCH_AMBARELLA) += cv75-evk.dtb
diff --git a/arch/arm64/boot/dts/ambarella/cv75-evk.dts b/arch/arm64/boot/dts/ambarella/cv75-evk.dts
new file mode 100644
index 000000000000..42a0fe24b83b
--- /dev/null
+++ b/arch/arm64/boot/dts/ambarella/cv75-evk.dts
@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Ambarella CV75 EVK board
+ */
+
+/dts-v1/;
+
+#include "cv75.dtsi"
+
+/ {
+ model = "Ambarella CV75 EVK Board";
+ compatible = "ambarella,cv75-evk", "ambarella,cv75";
+
+ aliases {
+ serial0 = &uart0;
+ };
+
+ chosen {
+ stdout-path = &uart0;
+ };
+
+ memory@200000 {
+ device_type = "memory";
+ reg = <0x0 0x00200000 0x0 0x07e00000>;
+ };
+};
+
+&uart0 {
+ status = "okay";
+};
diff --git a/arch/arm64/boot/dts/ambarella/cv75.dtsi b/arch/arm64/boot/dts/ambarella/cv75.dtsi
new file mode 100644
index 000000000000..3b7948954968
--- /dev/null
+++ b/arch/arm64/boot/dts/ambarella/cv75.dtsi
@@ -0,0 +1,176 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Ambarella CV75 SoC
+ *
+ * Boot peripheral: UART0 console.
+ * Clocks: a single ambarella,cv75-rct provider.
+ */
+
+#include <dt-bindings/clock/ambarella,cv75-rct.h>
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+
+/ {
+ compatible = "ambarella,cv75";
+ interrupt-parent = <&gic>;
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ cpus {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ cpu@0 {
+ compatible = "arm,cortex-a76";
+ device_type = "cpu";
+ reg = <0x000>;
+ enable-method = "psci";
+ };
+
+ cpu@1 {
+ compatible = "arm,cortex-a76";
+ device_type = "cpu";
+ reg = <0x100>;
+ enable-method = "psci";
+ };
+ };
+
+ osc: oscillator {
+ compatible = "fixed-clock";
+ #clock-cells = <0>;
+ clock-frequency = <24000000>;
+ clock-output-names = "osc";
+ };
+
+ psci {
+ compatible = "arm,psci-0.2";
+ method = "smc";
+ };
+
+ soc {
+ compatible = "simple-bus";
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+
+ ahb@ffe0000000 {
+ compatible = "simple-bus";
+ reg = <0xff 0xe0000000 0x0 0x01000000>;
+ ranges = <0xe0000000 0xff 0xe0000000 0x01000000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ s_scratchpad_syscon: scratchpad@e002e000 {
+ compatible = "ambarella,cv75-sec-scratchpad", "syscon";
+ reg = <0xe002e000 0x1000>;
+ };
+ };
+
+ apb@ffe4000000 {
+ compatible = "simple-bus";
+ reg = <0xff 0xe4000000 0x0 0x01000000>;
+ ranges = <0xe4000000 0xff 0xe4000000 0x01000000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ uart0: serial@e4000000 {
+ compatible = "ambarella,cv75-uart";
+ reg = <0xe4000000 0x1000>;
+ clocks = <&rct CV75_GCLK_UART0>;
+ interrupts = <GIC_SPI 170 IRQ_TYPE_LEVEL_HIGH>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&uart0_pins>;
+ reg-io-width = <4>;
+ reg-shift = <2>;
+
+ status = "disabled";
+ };
+
+ pinctrl: pinctrl@e4010000 {
+ compatible = "ambarella,cv75-pinctrl";
+ reg = <0xe4010000 0x1000>;
+ ambarella,drive-strength-syscon = <&rct>;
+ ambarella,pull-syscon = <&s_scratchpad_syscon>;
+
+ uart0_pins: uart0-pins {
+ function = "uart0";
+ groups = "uart0";
+ };
+ };
+
+ gpio0: gpio@e4013000 {
+ compatible = "ambarella,cv75-gpio", "arm,primecell";
+ reg = <0xe4013000 0x1000>;
+ clocks = <&rct CV75_GCLK_APB>;
+ clock-names = "apb_pclk";
+ interrupts = <GIC_SPI 163 IRQ_TYPE_LEVEL_HIGH>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ gpio-ranges = <&pinctrl 0 0 32>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ arm,primecell-periphid = <0x00000061>;
+ };
+
+ gpio1: gpio@e4014000 {
+ compatible = "ambarella,cv75-gpio", "arm,primecell";
+ reg = <0xe4014000 0x1000>;
+ clocks = <&rct CV75_GCLK_APB>;
+ clock-names = "apb_pclk";
+ interrupts = <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ gpio-ranges = <&pinctrl 0 32 32>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ arm,primecell-periphid = <0x00000061>;
+ };
+
+ gpio2: gpio@e4015000 {
+ compatible = "ambarella,cv75-gpio", "arm,primecell";
+ reg = <0xe4015000 0x1000>;
+ clocks = <&rct CV75_GCLK_APB>;
+ clock-names = "apb_pclk";
+ interrupts = <GIC_SPI 165 IRQ_TYPE_LEVEL_HIGH>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ gpio-ranges = <&pinctrl 0 64 32>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ arm,primecell-periphid = <0x00000061>;
+ };
+ };
+
+ rct: clock-controller@ffed080000 {
+ compatible = "ambarella,cv75-rct", "syscon";
+ reg = <0xff 0xed080000 0x0 0x1000>;
+ clocks = <&osc>;
+ clock-names = "osc";
+ #clock-cells = <1>;
+ assigned-clocks = <&rct CV75_GCLK_UART0>;
+ assigned-clock-parents = <&osc>;
+ assigned-clock-rates = <24000000>;
+ };
+
+ gic: interrupt-controller@fff0101000 {
+ compatible = "arm,gic-400";
+ reg = <0xff 0xf0101000 0x0 0x1000>,
+ <0xff 0xf0102000 0x0 0x2000>,
+ <0xff 0xf0104000 0x0 0x2000>,
+ <0xff 0xf0106000 0x0 0x2000>;
+ interrupt-controller;
+ #interrupt-cells = <3>;
+ #address-cells = <0>;
+ interrupts = <GIC_PPI 9
+ (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_HIGH)>;
+ };
+ };
+
+ timer {
+ compatible = "arm,armv8-timer";
+ interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>,
+ <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>,
+ <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>,
+ <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>,
+ <GIC_PPI 12 (GIC_CPU_MASK_SIMPLE(2) | IRQ_TYPE_LEVEL_LOW)>;
+ };
+};
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index ad3bd3d9507b..ae5bcc6c9fc7 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -36,6 +36,7 @@ CONFIG_CRASH_DUMP=y
CONFIG_ARCH_ACTIONS=y
CONFIG_ARCH_AIROHA=y
CONFIG_ARCH_SUNXI=y
+CONFIG_ARCH_AMBARELLA=y
CONFIG_ARCH_ALPINE=y
CONFIG_ARCH_APPLE=y
CONFIG_ARCH_ARTPEC=y
@@ -560,6 +561,7 @@ CONFIG_SERIAL_8250_CONSOLE=y
CONFIG_SERIAL_8250_NR_UARTS=8
CONFIG_SERIAL_8250_EXTENDED=y
CONFIG_SERIAL_8250_SHARE_IRQ=y
+CONFIG_SERIAL_8250_AMBARELLA=y
CONFIG_SERIAL_8250_BCM2835AUX=y
CONFIG_SERIAL_8250_DW=y
CONFIG_SERIAL_8250_EM=y
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread* [PATCH v5 12/12] MAINTAINERS: add ARM/AMBARELLA SoC support
2026-08-18 10:31 [PATCH v5 00/12] Ambarella CV75 SoC minimal bring-up Long Zhao via B4 Relay
` (10 preceding siblings ...)
2026-08-18 10:31 ` [PATCH v5 11/12] arm64: ambarella: add ARCH_AMBARELLA and CV75 EVK DT Long Zhao via B4 Relay
@ 2026-08-18 10:31 ` Long Zhao via B4 Relay
11 siblings, 0 replies; 15+ messages in thread
From: Long Zhao via B4 Relay @ 2026-08-18 10:31 UTC (permalink / raw)
To: Arnd Bergmann, Krzysztof Kozlowski, Alexandre Belloni, soc,
linux-arm-kernel
Cc: Rob Herring, Krzysztof Kozlowski, Conor Dooley, Michael Turquette,
Stephen Boyd, Linus Walleij, Bartosz Golaszewski,
Greg Kroah-Hartman, Jiri Slaby, Andy Shevchenko, Catalin Marinas,
Will Deacon, devicetree, linux-clk, linux-gpio, linux-serial,
linux-kernel, Brian Masney, Lee Jones, mfd, Long Zhao, Long Zhao
From: Long Zhao <longzhao@ambarella.com>
Add a maintainer entry covering Ambarella CV75 bindings, DTS and
related drivers.
Signed-off-by: Long Zhao <longzhao@ambarella.com>
---
MAINTAINERS | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index 803b60ad628f..4352a2dc1e3d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2502,6 +2502,22 @@ F: drivers/clocksource/asm9260_timer.c
F: drivers/rtc/rtc-asm9260.c
F: drivers/watchdog/asm9260_wdt.c
+ARM/AMBARELLA SOC SUPPORT
+M: Long Zhao <longzhao@ambarella.com>
+L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+L: devicetree@vger.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/arm/ambarella.yaml
+F: Documentation/devicetree/bindings/clock/ambarella,cv75-rct.yaml
+F: Documentation/devicetree/bindings/pinctrl/ambarella,cv75-pinctrl.yaml
+F: Documentation/devicetree/bindings/serial/ambarella,cv75-uart.yaml
+F: arch/arm64/boot/dts/ambarella/
+F: drivers/clk/ambarella/
+F: drivers/pinctrl/pinctrl-ambarella*
+F: drivers/tty/serial/8250/8250_ambarella.c
+F: include/dt-bindings/clock/ambarella,cv75-rct.h
+N: ambarella
+
ARM/AMD PENSANDO ARM64 ARCHITECTURE
M: Brad Larson <blarson@amd.com>
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread