[PATCH v2 0/4] riscv: sophgo: add clock support for sg2042

[PATCH v2 0/4] riscv: sophgo: add clock support for sg2042

[Chen Wang]

From: Chen Wang <unicorn_wang@outlook.com>

This series adds clock controller support for sophgo sg2042.

Thanks,
Chen

---

Changes in v2:
  The patch series is based on v6.7-rc1. You can simply review or test the
  patches at the link [2].
  - Squashed the patch adding clock definitions with the patch adding the
    binding for the clock controller.
  - Updating dt-binding for syscon, remove oneOf for property compatible;
    define clock controller as child of syscon.
  - DTS changes: merge sg2042-clock.dtsi into sg2042.dtsi; move clock-frequency
    property of osc to board devicethree due to the oscillator is outside the
    SoC.
  - Fixed some bugs in driver code during testing, including removing warnings
    for rv32_defconfig.
  - Updated MAINTAINERS info.

Changes in v1:
  The patch series is based on v6.7-rc1. You can simply review or test the
  patches at the link [1].

Link: https://github.com/unicornx/linux-riscv/commits/upstream-sg2042-clock-v1 [1]
Link: https://github.com/unicornx/linux-riscv/commits/upstream-sg2042-clock-v2 [2]

---

Chen Wang (4):
  dt-bindings: clock: sophgo: Add SG2042 bindings
  dt-bindings: soc: sophgo: Add Sophgo syscon module
  clk: sophgo: Add SG2042 clock generator driver
  riscv: dts: add clock generator for Sophgo SG2042 SoC

 .../clock/sophgo/sophgo,sg2042-clkgen.yaml    |   42 +
 .../soc/sophgo/sophgo,sg2042-syscon.yaml      |   58 +
 MAINTAINERS                                   |    7 +
 .../boot/dts/sophgo/sg2042-milkv-pioneer.dts  |    4 +
 arch/riscv/boot/dts/sophgo/sg2042.dtsi        |   77 +
 drivers/clk/Kconfig                           |    1 +
 drivers/clk/Makefile                          |    1 +
 drivers/clk/sophgo/Kconfig                    |    8 +
 drivers/clk/sophgo/Makefile                   |    2 +
 drivers/clk/sophgo/clk-sophgo-sg2042.c        | 1357 +++++++++++++++++
 drivers/clk/sophgo/clk-sophgo-sg2042.h        |  222 +++
 include/dt-bindings/clock/sophgo-sg2042-clk.h |  169 ++
 12 files changed, 1948 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/sophgo/sophgo,sg2042-clkgen.yaml
 create mode 100644 Documentation/devicetree/bindings/soc/sophgo/sophgo,sg2042-syscon.yaml
 create mode 100644 drivers/clk/sophgo/Kconfig
 create mode 100644 drivers/clk/sophgo/Makefile
 create mode 100644 drivers/clk/sophgo/clk-sophgo-sg2042.c
 create mode 100644 drivers/clk/sophgo/clk-sophgo-sg2042.h
 create mode 100644 include/dt-bindings/clock/sophgo-sg2042-clk.h


base-commit: b85ea95d086471afb4ad062012a4d73cd328fa86
-- 
2.25.1

[PATCH v2 1/4] dt-bindings: clock: sophgo: Add SG2042 bindings

[Chen Wang]

From: Chen Wang <unicorn_wang@outlook.com>

Add bindings for the clock generator on the SG2042 RISC-V SoC.

Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
---
 .../clock/sophgo/sophgo,sg2042-clkgen.yaml    |  42 +++++
 include/dt-bindings/clock/sophgo-sg2042-clk.h | 169 ++++++++++++++++++
 2 files changed, 211 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/sophgo/sophgo,sg2042-clkgen.yaml
 create mode 100644 include/dt-bindings/clock/sophgo-sg2042-clk.h

diff --git a/Documentation/devicetree/bindings/clock/sophgo/sophgo,sg2042-clkgen.yaml b/Documentation/devicetree/bindings/clock/sophgo/sophgo,sg2042-clkgen.yaml
new file mode 100644
index 000000000000..6c0d0461e489
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/sophgo/sophgo,sg2042-clkgen.yaml
@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/sophgo/sophgo,sg2042-clkgen.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sophgo SG2042 Clock Generator
+
+maintainers:
+  - Chen Wang <unicorn_wang@outlook.com>
+
+properties:
+  compatible:
+    const: sophgo,sg2042-clkgen
+
+  clocks:
+    items:
+      - description: Clock Generation IC (25 MHz)
+
+  '#clock-cells':
+    const: 1
+    description:
+      See <dt-bindings/clock/sophgo-sg2042-clk.h> for valid indices.
+
+  assigned-clocks: true
+
+  assigned-clock-rates: true
+
+required:
+  - compatible
+  - clocks
+  - '#clock-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    clock-controller {
+            compatible = "sophgo,sg2042-clkgen";
+            clocks = <&cgi>;
+            #clock-cells = <1>;
+    };
diff --git a/include/dt-bindings/clock/sophgo-sg2042-clk.h b/include/dt-bindings/clock/sophgo-sg2042-clk.h
new file mode 100644
index 000000000000..a8e05c00c3bf
--- /dev/null
+++ b/include/dt-bindings/clock/sophgo-sg2042-clk.h
@@ -0,0 +1,169 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/*
+ * Copyright (C) 2023 Sophgo Technology Inc. All rights reserved.
+ */
+
+#ifndef __DT_BINDINGS_CLOCK_SOPHGO_SG2042_H__
+#define __DT_BINDINGS_CLOCK_SOPHGO_SG2042_H__
+
+/* Divider clocks */
+#define DIV_CLK_MPLL_RP_CPU_NORMAL_0 0
+#define DIV_CLK_MPLL_AXI_DDR_0 1
+#define DIV_CLK_FPLL_DDR01_1 2
+#define DIV_CLK_FPLL_DDR23_1 3
+#define DIV_CLK_FPLL_RP_CPU_NORMAL_1 4
+#define DIV_CLK_FPLL_50M_A53 5
+#define DIV_CLK_FPLL_TOP_RP_CMN_DIV2 6
+#define DIV_CLK_FPLL_UART_500M 7
+#define DIV_CLK_FPLL_AHB_LPC 8
+#define DIV_CLK_FPLL_EFUSE 9
+#define DIV_CLK_FPLL_TX_ETH0 10
+#define DIV_CLK_FPLL_PTP_REF_I_ETH0 11
+#define DIV_CLK_FPLL_REF_ETH0 12
+#define DIV_CLK_FPLL_EMMC 13
+#define DIV_CLK_FPLL_SD 14
+#define DIV_CLK_FPLL_TOP_AXI0 15
+#define DIV_CLK_FPLL_TOP_AXI_HSPERI 16
+#define DIV_CLK_FPLL_AXI_DDR_1 17
+#define DIV_CLK_FPLL_DIV_TIMER1 18
+#define DIV_CLK_FPLL_DIV_TIMER2 19
+#define DIV_CLK_FPLL_DIV_TIMER3 20
+#define DIV_CLK_FPLL_DIV_TIMER4 21
+#define DIV_CLK_FPLL_DIV_TIMER5 22
+#define DIV_CLK_FPLL_DIV_TIMER6 23
+#define DIV_CLK_FPLL_DIV_TIMER7 24
+#define DIV_CLK_FPLL_DIV_TIMER8 25
+#define DIV_CLK_FPLL_100K_EMMC 26
+#define DIV_CLK_FPLL_100K_SD 27
+#define DIV_CLK_FPLL_GPIO_DB 28
+#define DIV_CLK_DPLL0_DDR01_0 29
+#define DIV_CLK_DPLL1_DDR23_0 30
+
+/* Gate clocks */
+#define GATE_CLK_RP_CPU_NORMAL_DIV0 31
+#define GATE_CLK_AXI_DDR_DIV0 32
+
+#define GATE_CLK_RP_CPU_NORMAL_DIV1 33
+#define GATE_CLK_A53_50M 34
+#define GATE_CLK_TOP_RP_CMN_DIV2 35
+#define GATE_CLK_HSDMA 36
+#define GATE_CLK_EMMC_100M 37
+#define GATE_CLK_SD_100M 38
+#define GATE_CLK_TX_ETH0 39
+#define GATE_CLK_PTP_REF_I_ETH0 40
+#define GATE_CLK_REF_ETH0 41
+#define GATE_CLK_UART_500M 42
+#define GATE_CLK_EFUSE 43
+
+#define GATE_CLK_AHB_LPC 44
+#define GATE_CLK_AHB_ROM 45
+#define GATE_CLK_AHB_SF 46
+
+#define GATE_CLK_APB_UART 47
+#define GATE_CLK_APB_TIMER 48
+#define GATE_CLK_APB_EFUSE 49
+#define GATE_CLK_APB_GPIO 50
+#define GATE_CLK_APB_GPIO_INTR 51
+#define GATE_CLK_APB_SPI 52
+#define GATE_CLK_APB_I2C 53
+#define GATE_CLK_APB_WDT 54
+#define GATE_CLK_APB_PWM 55
+#define GATE_CLK_APB_RTC 56
+
+#define GATE_CLK_AXI_PCIE0 57
+#define GATE_CLK_AXI_PCIE1 58
+#define GATE_CLK_SYSDMA_AXI 59
+#define GATE_CLK_AXI_DBG_I2C 60
+#define GATE_CLK_AXI_SRAM 61
+#define GATE_CLK_AXI_ETH0 62
+#define GATE_CLK_AXI_EMMC 63
+#define GATE_CLK_AXI_SD 64
+#define GATE_CLK_TOP_AXI0 65
+#define GATE_CLK_TOP_AXI_HSPERI 66
+
+#define GATE_CLK_TIMER1 67
+#define GATE_CLK_TIMER2 68
+#define GATE_CLK_TIMER3 69
+#define GATE_CLK_TIMER4 70
+#define GATE_CLK_TIMER5 71
+#define GATE_CLK_TIMER6 72
+#define GATE_CLK_TIMER7 73
+#define GATE_CLK_TIMER8 74
+#define GATE_CLK_100K_EMMC 75
+#define GATE_CLK_100K_SD 76
+#define GATE_CLK_GPIO_DB 77
+
+#define GATE_CLK_AXI_DDR_DIV1 78
+#define GATE_CLK_DDR01_DIV1 79
+#define GATE_CLK_DDR23_DIV1 80
+/* DPLL0 */
+#define GATE_CLK_DDR01_DIV0 81
+/* DPLL1 */
+#define GATE_CLK_DDR23_DIV0 82
+
+#define GATE_CLK_DDR01 83
+#define GATE_CLK_DDR23 84
+#define GATE_CLK_RP_CPU_NORMAL 85
+#define GATE_CLK_AXI_DDR 86
+#define GATE_CLK_RXU0 87
+#define GATE_CLK_RXU1 88
+#define GATE_CLK_RXU2 89
+#define GATE_CLK_RXU3 90
+#define GATE_CLK_RXU4 91
+#define GATE_CLK_RXU5 92
+#define GATE_CLK_RXU6 93
+#define GATE_CLK_RXU7 94
+#define GATE_CLK_RXU8 95
+#define GATE_CLK_RXU9 96
+#define GATE_CLK_RXU10 97
+#define GATE_CLK_RXU11 98
+#define GATE_CLK_RXU12 99
+#define GATE_CLK_RXU13 100
+#define GATE_CLK_RXU14 101
+#define GATE_CLK_RXU15 102
+#define GATE_CLK_RXU16 103
+#define GATE_CLK_RXU17 104
+#define GATE_CLK_RXU18 105
+#define GATE_CLK_RXU19 106
+#define GATE_CLK_RXU20 107
+#define GATE_CLK_RXU21 108
+#define GATE_CLK_RXU22 109
+#define GATE_CLK_RXU23 110
+#define GATE_CLK_RXU24 111
+#define GATE_CLK_RXU25 112
+#define GATE_CLK_RXU26 113
+#define GATE_CLK_RXU27 114
+#define GATE_CLK_RXU28 115
+#define GATE_CLK_RXU29 116
+#define GATE_CLK_RXU30 117
+#define GATE_CLK_RXU31 118
+#define GATE_CLK_MP0 119
+#define GATE_CLK_MP1 120
+#define GATE_CLK_MP2 121
+#define GATE_CLK_MP3 122
+#define GATE_CLK_MP4 123
+#define GATE_CLK_MP5 124
+#define GATE_CLK_MP6 125
+#define GATE_CLK_MP7 126
+#define GATE_CLK_MP8 127
+#define GATE_CLK_MP9 128
+#define GATE_CLK_MP10 129
+#define GATE_CLK_MP11 130
+#define GATE_CLK_MP12 131
+#define GATE_CLK_MP13 132
+#define GATE_CLK_MP14 133
+#define GATE_CLK_MP15 134
+
+/* MUX clocks */
+#define MUX_CLK_DDR01 135
+#define MUX_CLK_DDR23 136
+#define MUX_CLK_RP_CPU_NORMAL 137
+#define MUX_CLK_AXI_DDR 138
+
+/* PLL clocks */
+#define MPLL_CLK	139
+#define FPLL_CLK	140
+#define DPLL0_CLK	141
+#define DPLL1_CLK	142
+
+#endif /* __DT_BINDINGS_CLOCK_SOPHGO_SG2042_H__ */
-- 
2.25.1

Re: [PATCH v2 1/4] dt-bindings: clock: sophgo: Add SG2042 bindings

[Krzysztof Kozlowski]

On 27/11/2023 01:58, Chen Wang wrote:
> From: Chen Wang <unicorn_wang@outlook.com>
> 
> Add bindings for the clock generator on the SG2042 RISC-V SoC.
> 
> Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
> ---
>  .../clock/sophgo/sophgo,sg2042-clkgen.yaml    |  42 +++++
>  include/dt-bindings/clock/sophgo-sg2042-clk.h | 169 ++++++++++++++++++
>  2 files changed, 211 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/sophgo/sophgo,sg2042-clkgen.yaml
>  create mode 100644 include/dt-bindings/clock/sophgo-sg2042-clk.h
> 
> diff --git a/Documentation/devicetree/bindings/clock/sophgo/sophgo,sg2042-clkgen.yaml b/Documentation/devicetree/bindings/clock/sophgo/sophgo,sg2042-clkgen.yaml
> new file mode 100644
> index 000000000000..6c0d0461e489
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/sophgo/sophgo,sg2042-clkgen.yaml
> @@ -0,0 +1,42 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/sophgo/sophgo,sg2042-clkgen.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sophgo SG2042 Clock Generator
> +
> +maintainers:
> +  - Chen Wang <unicorn_wang@outlook.com>
> +
> +properties:
> +  compatible:
> +    const: sophgo,sg2042-clkgen
> +
> +  clocks:
> +    items:
> +      - description: Clock Generation IC (25 MHz)
> +
> +  '#clock-cells':
> +    const: 1
> +    description:
> +      See <dt-bindings/clock/sophgo-sg2042-clk.h> for valid indices.
> +
> +  assigned-clocks: true

Drop

> +
> +  assigned-clock-rates: true

Drop

> +
> +required:
> +  - compatible
> +  - clocks
> +  - '#clock-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    clock-controller {
> +            compatible = "sophgo,sg2042-clkgen";

Use 4 spaces for example indentation.

> +            clocks = <&cgi>;
> +            #clock-cells = <1>;
> +    };
> diff --git a/include/dt-bindings/clock/sophgo-sg2042-clk.h b/include/dt-bindings/clock/sophgo-sg2042-clk.h
> new file mode 100644
> index 000000000000..a8e05c00c3bf
> --- /dev/null
> +++ b/include/dt-bindings/clock/sophgo-sg2042-clk.h

The same filename as binding.

> @@ -0,0 +1,169 @@
> +/* SPDX-License-Identifier: GPL-2.0 OR MIT */

Any particular reason for a bit different license than the bindings? How
is your DTS licensed?

> +/*
> + * Copyright (C) 2023 Sophgo Technology Inc. All rights reserved.
> + */
> +
> +#ifndef __DT_BINDINGS_CLOCK_SOPHGO_SG2042_H__
> +#define __DT_BINDINGS_CLOCK_SOPHGO_SG2042_H__
> +
> +/* Divider clocks */
> +#define DIV_CLK_MPLL_RP_CPU_NORMAL_0 0

Missing tabs before each value.



Best regards,
Krzysztof

[PATCH v2 2/4] dt-bindings: soc: sophgo: Add Sophgo syscon module

[Chen Wang]

From: Chen Wang <unicorn_wang@outlook.com>

Add documentation to describe Sophgo System Controller Registers for
SG2042.

Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
---
 .../soc/sophgo/sophgo,sg2042-syscon.yaml      | 58 +++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/sophgo/sophgo,sg2042-syscon.yaml

diff --git a/Documentation/devicetree/bindings/soc/sophgo/sophgo,sg2042-syscon.yaml b/Documentation/devicetree/bindings/soc/sophgo/sophgo,sg2042-syscon.yaml
new file mode 100644
index 000000000000..329d645091b4
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/sophgo/sophgo,sg2042-syscon.yaml
@@ -0,0 +1,58 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/sophgo/sophgo,sg2042-syscon.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sophgo SG2042 SoC system controller
+
+maintainers:
+  - Chen Wang <unicorn_wang@outlook.com>
+
+description:
+  The Sophgo SG2042 SoC system controller provides register information such
+  as offset, mask and shift to configure some modules, such as clocks, reset
+  signals and pinctrl.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - sophgo,sg2042-syscon
+      - const: syscon
+
+  reg:
+    maxItems: 1
+
+  clock-controller:
+    # Child node
+    type: object
+    $ref: ../../clock/sophgo/sophgo,sg2042-clkgen.yaml
+    description:
+      Clock controller for the SoC clocks. This child node definition
+      should follow the bindings specified in
+      Documentation/devicetree/bindings/clock/sophgo/sophgo,sg2042-clkgen.yaml
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    syscon@30010000 {
+        compatible = "sophgo,sg2042-syscon", "syscon";
+        reg = <0x30010000 0x1000>;
+    };
+
+    syscon@30020000 {
+        compatible = "sophgo,sg2042-syscon", "syscon";
+        reg = <0x30020000 0x1000>;
+
+        clock-controller {
+            compatible = "sophgo,sg2042-clkgen";
+            clocks = <&osc>;
+            #clock-cells = <1>;
+        };
+    };
-- 
2.25.1

Re: [PATCH v2 2/4] dt-bindings: soc: sophgo: Add Sophgo syscon module

[Krzysztof Kozlowski]

On 27/11/2023 01:58, Chen Wang wrote:
> From: Chen Wang <unicorn_wang@outlook.com>
> 
> Add documentation to describe Sophgo System Controller Registers for
> SG2042.
> 
> Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
> ---
>  .../soc/sophgo/sophgo,sg2042-syscon.yaml      | 58 +++++++++++++++++++
>  1 file changed, 58 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/sophgo/sophgo,sg2042-syscon.yaml
> 
> diff --git a/Documentation/devicetree/bindings/soc/sophgo/sophgo,sg2042-syscon.yaml b/Documentation/devicetree/bindings/soc/sophgo/sophgo,sg2042-syscon.yaml
> new file mode 100644
> index 000000000000..329d645091b4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/sophgo/sophgo,sg2042-syscon.yaml
> @@ -0,0 +1,58 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/sophgo/sophgo,sg2042-syscon.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sophgo SG2042 SoC system controller
> +
> +maintainers:
> +  - Chen Wang <unicorn_wang@outlook.com>
> +
> +description:
> +  The Sophgo SG2042 SoC system controller provides register information such
> +  as offset, mask and shift to configure some modules, such as clocks, reset
> +  signals and pinctrl.
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - sophgo,sg2042-syscon
> +      - const: syscon
> +
> +  reg:
> +    maxItems: 1
> +
> +  clock-controller:
> +    # Child node
> +    type: object
> +    $ref: ../../clock/sophgo/sophgo,sg2042-clkgen.yaml

Use full path, so /schemas/clock/
(look at other bindings how they do it)

> +    description:
> +      Clock controller for the SoC clocks. This child node definition
> +      should follow the bindings specified in
> +      Documentation/devicetree/bindings/clock/sophgo/sophgo,sg2042-clkgen.yaml

Drop description.

> +
> +required:
> +  - compatible
> +  - reg

clock-controller, no?

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    syscon@30010000 {
> +        compatible = "sophgo,sg2042-syscon", "syscon";
> +        reg = <0x30010000 0x1000>;
> +    };
> +
> +    syscon@30020000 {
> +        compatible = "sophgo,sg2042-syscon", "syscon";

Wait, these are two different devices. Why do you use the same
compatible for them? Is their register layout exactly the same?

Best regards,
Krzysztof

[PATCH v2 3/4] clk: sophgo: Add SG2042 clock generator driver

[Chen Wang]

From: Chen Wang <unicorn_wang@outlook.com>

Add a driver for the SOPHGO SG2042 clock generator.

Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
---
 MAINTAINERS                            |    7 +
 drivers/clk/Kconfig                    |    1 +
 drivers/clk/Makefile                   |    1 +
 drivers/clk/sophgo/Kconfig             |    8 +
 drivers/clk/sophgo/Makefile            |    2 +
 drivers/clk/sophgo/clk-sophgo-sg2042.c | 1357 ++++++++++++++++++++++++
 drivers/clk/sophgo/clk-sophgo-sg2042.h |  222 ++++
 7 files changed, 1598 insertions(+)
 create mode 100644 drivers/clk/sophgo/Kconfig
 create mode 100644 drivers/clk/sophgo/Makefile
 create mode 100644 drivers/clk/sophgo/clk-sophgo-sg2042.c
 create mode 100644 drivers/clk/sophgo/clk-sophgo-sg2042.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 97f51d5ec1cf..93187d59b498 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20269,6 +20269,13 @@ S:	Maintained
 F:	arch/riscv/boot/dts/sophgo/
 F:	Documentation/devicetree/bindings/riscv/sophgo.yaml
 
+SOPHGO CLOCK DRIVER
+M:	Chen Wang <unicorn_wang@outlook.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/clock/sophgo/
+F:	drivers/clk/sophgo/
+F:	include/dt-bindings/clock/sophgo-sg2042-clk.h
+
 SOUND
 M:	Jaroslav Kysela <perex@perex.cz>
 M:	Takashi Iwai <tiwai@suse.com>
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index c30d0d396f7a..514343934fda 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -499,6 +499,7 @@ source "drivers/clk/rockchip/Kconfig"
 source "drivers/clk/samsung/Kconfig"
 source "drivers/clk/sifive/Kconfig"
 source "drivers/clk/socfpga/Kconfig"
+source "drivers/clk/sophgo/Kconfig"
 source "drivers/clk/sprd/Kconfig"
 source "drivers/clk/starfive/Kconfig"
 source "drivers/clk/sunxi/Kconfig"
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index ed71f2e0ee36..aa5d2cf0b6a6 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -119,6 +119,7 @@ obj-$(CONFIG_ARCH_ROCKCHIP)		+= rockchip/
 obj-$(CONFIG_COMMON_CLK_SAMSUNG)	+= samsung/
 obj-$(CONFIG_CLK_SIFIVE)		+= sifive/
 obj-y					+= socfpga/
+obj-$(CONFIG_ARCH_SOPHGO)		+= sophgo/
 obj-$(CONFIG_PLAT_SPEAR)		+= spear/
 obj-y					+= sprd/
 obj-$(CONFIG_ARCH_STI)			+= st/
diff --git a/drivers/clk/sophgo/Kconfig b/drivers/clk/sophgo/Kconfig
new file mode 100644
index 000000000000..b0fbe4499870
--- /dev/null
+++ b/drivers/clk/sophgo/Kconfig
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config CLK_SOPHGO_SG2042
+	bool "Sophgo SG2042 clock support"
+	depends on ARCH_SOPHGO || COMPILE_TEST
+	default ARCH_SOPHGO
+	help
+	  Say yes here to support the clock controller on the Sophgo SG2042 SoC.
diff --git a/drivers/clk/sophgo/Makefile b/drivers/clk/sophgo/Makefile
new file mode 100644
index 000000000000..13834cce260c
--- /dev/null
+++ b/drivers/clk/sophgo/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_CLK_SOPHGO_SG2042)	+= clk-sophgo-sg2042.o
diff --git a/drivers/clk/sophgo/clk-sophgo-sg2042.c b/drivers/clk/sophgo/clk-sophgo-sg2042.c
new file mode 100644
index 000000000000..e8cd06a72b81
--- /dev/null
+++ b/drivers/clk/sophgo/clk-sophgo-sg2042.c
@@ -0,0 +1,1357 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Sophgo SG2042 Clock Generator Driver
+ *
+ * Copyright (C) 2023 Sophgo Technology Inc. All rights reserved.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_address.h>
+
+#include <dt-bindings/clock/sophgo-sg2042-clk.h>
+
+#include "clk-sophgo-sg2042.h"
+
+#define div_mask(width) ((1 << (width)) - 1)
+#define ENCODE_PLL_CTRL(fbdiv, p1, p2, refdiv) \
+	(((fbdiv & 0xfff) << 16) | ((p2 & 0x7) << 12) | ((p1 & 0x7) << 8) | (refdiv & 0x3f))
+
+static inline int __sg2042_pll_enable(struct sg2042_pll_clock *pll, bool en)
+{
+	unsigned int value = 0;
+	unsigned long enter;
+	struct regmap *map = pll->map;
+
+	if (en) {
+		/* wait pll lock */
+		enter = jiffies;
+		regmap_read(map, pll->offset_status, &value);
+		while (!((value >> pll->shift_status_lock) & 0x1)) {
+			regmap_read(map, pll->shift_status_lock, &value);
+			if (time_after(jiffies, enter + HZ / 10))
+				pr_warn("%s not locked\n", pll->name);
+		}
+		/* wait pll updating */
+		enter = jiffies;
+		regmap_read(map, pll->shift_status_updating, &value);
+		while (((value >> pll->shift_status_updating) & 0x1)) {
+			regmap_read(map, pll->shift_status_updating, &value);
+			if (time_after(jiffies, enter + HZ / 10))
+				pr_warn("%s still updating\n", pll->name);
+		}
+		/* enable pll */
+		regmap_read(map, pll->offset_enable, &value);
+		regmap_write(map, pll->offset_enable, value | (1 << pll->shift_enable));
+	} else {
+		/* disable pll */
+		regmap_read(map, pll->offset_enable, &value);
+		regmap_write(map, pll->offset_enable, value & (~(1 << pll->shift_enable)));
+	}
+
+	return 0;
+}
+
+static unsigned int __sg2042_get_table_div(
+	const struct clk_div_table *table,
+	unsigned int val)
+{
+	const struct clk_div_table *clkt;
+
+	for (clkt = table; clkt->div; clkt++)
+		if (clkt->val == val)
+			return clkt->div;
+	return 0;
+}
+
+static unsigned int __sg2042_get_div(
+	const struct clk_div_table *table,
+	unsigned int val,
+	unsigned long flags, u8 width)
+{
+	if (flags & CLK_DIVIDER_ONE_BASED)
+		return val;
+	if (flags & CLK_DIVIDER_POWER_OF_TWO)
+		return 1 << val;
+	if (flags & CLK_DIVIDER_MAX_AT_ZERO)
+		return val ? val : div_mask(width) + 1;
+	if (table)
+		return __sg2042_get_table_div(table, val);
+	return val + 1;
+}
+
+/*
+ * @reg_value: current register value
+ * @parent_rate: parent frequency
+ *
+ * This function is used to calculate below "rate" in equation
+ * rate = (parent_rate/REFDIV) x FBDIV/POSTDIV1/POSTDIV2
+ *      = (parent_rate x FBDIV) / (REFDIV x POSTDIV1 x POSTDIV2)
+ */
+static unsigned long __sg2042_pll_recalc_rate(
+	unsigned int reg_value,
+	unsigned long parent_rate)
+{
+	unsigned int fbdiv, refdiv;
+	unsigned int postdiv1, postdiv2;
+	u64 rate, numerator, denominator;
+
+	fbdiv = (reg_value >> 16) & 0xfff;
+	refdiv = reg_value & 0x3f;
+	postdiv1 = (reg_value >> 8) & 0x7;
+	postdiv2 = (reg_value >> 12) & 0x7;
+
+	numerator = parent_rate * fbdiv;
+	denominator = refdiv * postdiv1 * postdiv2;
+	do_div(numerator, denominator);
+	rate = numerator;
+
+	return rate;
+}
+
+/*
+ * Below array is the total combination lists of POSTDIV1 and POSTDIV2
+ * for example:
+ * postdiv1_2[0] = {2, 4, 8}
+ *           ==> div1 = 2, div2 = 4 , div1 * div2 = 8
+ * And POSTDIV_RESULT_INDEX point to 3rd element in the array
+ */
+#define	POSTDIV_RESULT_INDEX	2
+static int postdiv1_2[][3] = {
+	{2, 4,  8}, {3, 3,  9}, {2, 5, 10}, {2, 6, 12},
+	{2, 7, 14}, {3, 5, 15}, {4, 4, 16}, {3, 6, 18},
+	{4, 5, 20}, {3, 7, 21}, {4, 6, 24}, {5, 5, 25},
+	{4, 7, 28}, {5, 6, 30}, {5, 7, 35}, {6, 6, 36},
+	{6, 7, 42}, {7, 7, 49}
+};
+
+/*
+ * Based on input rate/prate/fbdiv/refdiv, look up the postdiv1_2 table
+ * to get the closest postdiiv combination.
+ * @rate: FOUTPOSTDIV
+ * @prate: parent rate, i.e. FREF
+ * @fbdiv: FBDIV
+ * @refdiv: REFDIV
+ * @postdiv1: POSTDIV1, output
+ * @postdiv2: POSTDIV2, output
+ * See TRM:
+ * FOUTPOSTDIV = FREF * FBDIV / REFDIV / (POSTDIV1 * POSTDIV2)
+ * So we get following formula to get POSTDIV1 and POSTDIV2:
+ * POSTDIV = (prate/REFDIV) x FBDIV/rate
+ * above POSTDIV = POSTDIV1*POSTDIV2
+ */
+static int __sg2042_pll_get_postdiv_1_2(
+	unsigned long rate,
+	unsigned long prate,
+	unsigned int fbdiv,
+	unsigned int refdiv,
+	unsigned int *postdiv1,
+	unsigned int *postdiv2)
+{
+	int index = 0;
+	int ret = 0;
+	u64 tmp0;
+
+	/* prate/REFDIV and result save to tmp0 */
+	tmp0 = prate;
+	do_div(tmp0, refdiv);
+
+	/* ((prate/REFDIV) x FBDIV) and result save to tmp0 */
+	tmp0 *= fbdiv;
+
+	/* ((prate/REFDIV) x FBDIV)/rate and result save to tmp0 */
+	do_div(tmp0, rate);
+
+	/* tmp0 is POSTDIV1*POSTDIV2, now we calculate div1 and div2 value */
+	if (tmp0 <= 7) {
+		/* (div1 * div2) <= 7, no need to use array search */
+		*postdiv1 = tmp0;
+		*postdiv2 = 1;
+	} else {
+		/* (div1 * div2) > 7, use array search */
+		for (index = 0; index < ARRAY_SIZE(postdiv1_2); index++) {
+			if (tmp0 > postdiv1_2[index][POSTDIV_RESULT_INDEX]) {
+				continue;
+			} else {
+				/* found it */
+				break;
+			}
+		}
+		if (index < ARRAY_SIZE(postdiv1_2)) {
+			*postdiv1 = postdiv1_2[index][1];
+			*postdiv2 = postdiv1_2[index][0];
+		} else {
+			pr_debug("%s can not find in postdiv array!\n", __func__);
+			ret = -EINVAL;
+		}
+	}
+
+	return ret;
+}
+
+#define KHZ 1000UL
+#define MHZ (KHZ * KHZ)
+
+#define REFDIV_MIN 1
+#define REFDIV_MAX 63
+#define FBDIV_MIN 16
+#define FBDIV_MAX 320
+
+#define PLL_FREF_SG2042 (25 * MHZ)
+
+#define PLL_FOUTPOSTDIV_MIN (16 * MHZ)
+#define PLL_FOUTPOSTDIV_MAX (3200 * MHZ)
+
+#define PLL_FOUTVCO_MIN (800 * MHZ)
+#define PLL_FOUTVCO_MAX (3200 * MHZ)
+
+struct sg2042_pll_ctrl {
+	unsigned long freq;
+	unsigned int fbdiv;
+	unsigned int postdiv1;
+	unsigned int postdiv2;
+	unsigned int refdiv;
+};
+
+/*
+ * Based on the given FOUTPISTDIV and the input FREF to calculate
+ * the REFDIV/FBDIV/PSTDIV1/POSTDIV2 combination for pllctrl register.
+ * @req_rate: expected output clock rate, i.e. FOUTPISTDIV
+ * @parent_rate: input parent clock rate, i.e. FREF
+ * @best: output to hold calculated combination of REFDIV/FBDIV/PSTDIV1/POSTDIV2
+ */
+static int __sg2042_get_pll_ctl_setting(
+	struct sg2042_pll_ctrl *best,
+	unsigned long req_rate,
+	unsigned long parent_rate)
+{
+	int ret;
+	unsigned int fbdiv, refdiv, postdiv1, postdiv2;
+	unsigned long foutpostdiv;
+	u64 tmp;
+	u64 foutvco;
+
+	if (parent_rate != PLL_FREF_SG2042) {
+		pr_alert("INVALID FREF: %ld\n", parent_rate);
+		return -EINVAL;
+	}
+
+	if (req_rate < PLL_FOUTPOSTDIV_MIN || req_rate > PLL_FOUTPOSTDIV_MAX) {
+		pr_alert("INVALID FOUTPOSTDIV: %ld\n", req_rate);
+		return -EINVAL;
+	}
+
+	memset(best, 0, sizeof(struct sg2042_pll_ctrl));
+
+	for (refdiv = REFDIV_MIN; refdiv < REFDIV_MAX + 1; refdiv++) {
+		/* required by hardware: FREF/REFDIV must > 10 */
+		tmp = parent_rate;
+		do_div(tmp, refdiv);
+		if (tmp <= 10)
+			continue;
+
+		for (fbdiv = FBDIV_MIN; fbdiv < FBDIV_MAX + 1; fbdiv++) {
+			/*
+			 * FOUTVCO = FREF*FBDIV/REFDIV validation
+			 * required by hardware, FOUTVCO must [800MHz, 3200MHz]
+			 */
+			foutvco = parent_rate * fbdiv;
+			do_div(foutvco, refdiv);
+			if (foutvco < PLL_FOUTVCO_MIN || foutvco > PLL_FOUTVCO_MAX)
+				continue;
+
+			ret = __sg2042_pll_get_postdiv_1_2(
+				req_rate, parent_rate, fbdiv, refdiv,
+				&postdiv1, &postdiv2);
+			if (ret)
+				continue;
+
+			/*
+			 * FOUTPOSTDIV = FREF*FBDIV/REFDIV/(POSTDIV1*POSTDIV2)
+			 *             = FOUTVCO/(POSTDIV1*POSTDIV2)
+			 */
+			tmp = foutvco;
+			do_div(tmp, (postdiv1 * postdiv2));
+			foutpostdiv = (unsigned long)tmp;
+			/* Iterative to approach the expected value */
+			if (abs_diff(foutpostdiv, req_rate) <
+			    abs_diff(best->freq, req_rate)) {
+				best->freq = foutpostdiv;
+				best->refdiv = refdiv;
+				best->fbdiv = fbdiv;
+				best->postdiv1 = postdiv1;
+				best->postdiv2 = postdiv2;
+				if (foutpostdiv == req_rate)
+					return 0;
+			}
+			continue;
+		}
+	}
+
+	if (best->freq == 0)
+		return -EINVAL;
+	else
+		return 0;
+}
+
+/*
+ * @hw: ccf use to hook get sg2042_pll_clock
+ * @parent_rate: parent rate
+ *
+ * The is function will be called through clk_get_rate
+ * and return current rate after decoding reg value
+ */
+static unsigned long sg2042_clk_pll_recalc_rate(
+	struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	unsigned int value;
+	unsigned long rate;
+	struct sg2042_pll_clock *pll = to_sg2042_pll_clk(hw);
+
+	regmap_read(pll->map, pll->offset_ctrl, &value);
+	rate = __sg2042_pll_recalc_rate(value, parent_rate);
+
+	pr_debug("--> %s: pll_recalc_rate: val = %ld\n",
+		clk_hw_get_name(hw), rate);
+	return rate;
+}
+
+static long sg2042_clk_pll_round_rate(
+	struct clk_hw *hw,
+	unsigned long req_rate,
+	unsigned long *prate)
+{
+	unsigned int value;
+	struct sg2042_pll_ctrl pctrl_table;
+	long proper_rate;
+	int ret;
+
+	ret = __sg2042_get_pll_ctl_setting(&pctrl_table, req_rate, *prate);
+	if (ret) {
+		proper_rate = 0;
+		goto out;
+	}
+
+	value = ENCODE_PLL_CTRL(pctrl_table.fbdiv, pctrl_table.postdiv1,
+			     pctrl_table.postdiv2, pctrl_table.refdiv);
+	proper_rate = (long)__sg2042_pll_recalc_rate(value, *prate);
+
+out:
+	pr_debug("--> %s: pll_round_rate: val = %ld\n",
+		clk_hw_get_name(hw), proper_rate);
+	return proper_rate;
+}
+
+static int sg2042_clk_pll_determine_rate(
+	struct clk_hw *hw,
+	struct clk_rate_request *req)
+{
+	req->rate = sg2042_clk_pll_round_rate(hw, min(req->rate, req->max_rate),
+					  &req->best_parent_rate);
+	pr_debug("--> %s: pll_determine_rate: val = %ld\n",
+		clk_hw_get_name(hw), req->rate);
+	return 0;
+}
+
+static int sg2042_clk_pll_set_rate(
+	struct clk_hw *hw,
+	unsigned long rate,
+	unsigned long parent_rate)
+{
+	unsigned long flags;
+	unsigned int value;
+	int ret = 0;
+	struct sg2042_pll_ctrl pctrl_table;
+	struct sg2042_pll_clock *pll = to_sg2042_pll_clk(hw);
+
+	spin_lock_irqsave(pll->lock, flags);
+	if (__sg2042_pll_enable(pll, 0)) {
+		pr_warn("Can't disable pll(%s), status error\n", pll->name);
+		goto out;
+	}
+	ret = __sg2042_get_pll_ctl_setting(&pctrl_table, rate, parent_rate);
+	if (ret) {
+		pr_warn("%s: Can't find a proper pll setting\n", pll->name);
+		goto out2;
+	}
+
+	value = ENCODE_PLL_CTRL(pctrl_table.fbdiv, pctrl_table.postdiv1,
+			     pctrl_table.postdiv2, pctrl_table.refdiv);
+
+	/* write the value to top register */
+	regmap_write(pll->map, pll->offset_ctrl, value);
+
+out2:
+	__sg2042_pll_enable(pll, 1);
+out:
+	spin_unlock_irqrestore(pll->lock, flags);
+
+	pr_debug("--> %s: pll_set_rate: val = 0x%x\n",
+		clk_hw_get_name(hw), value);
+	return ret;
+}
+
+static unsigned long sg2042_clk_divider_recalc_rate(
+	struct clk_hw *hw,
+	unsigned long parent_rate)
+{
+	struct sg2042_divider_clock *divider = to_sg2042_clk_divider(hw);
+	unsigned int val;
+	unsigned long ret_rate;
+
+	val = readl(divider->reg) >> divider->shift;
+	val &= div_mask(divider->width);
+
+	ret_rate = divider_recalc_rate(hw, parent_rate, val, divider->table,
+				   divider->div_flags, divider->width);
+
+	pr_debug("--> %s: divider_recalc_rate: val = %ld\n",
+		clk_hw_get_name(hw), ret_rate);
+	return ret_rate;
+}
+
+static long sg2042_clk_divider_round_rate(
+	struct clk_hw *hw,
+	unsigned long rate,
+	unsigned long *prate)
+{
+	int bestdiv;
+	unsigned long ret_rate;
+	struct sg2042_divider_clock *divider = to_sg2042_clk_divider(hw);
+
+	/* if read only, just return current value */
+	if (divider->div_flags & CLK_DIVIDER_READ_ONLY) {
+		bestdiv = readl(divider->reg) >> divider->shift;
+		bestdiv &= div_mask(divider->width);
+		bestdiv = __sg2042_get_div(divider->table, bestdiv, divider->div_flags,
+				   divider->width);
+		ret_rate = DIV_ROUND_UP_ULL((u64)*prate, bestdiv);
+	} else {
+		ret_rate = divider_round_rate(hw, rate, prate, divider->table,
+				  divider->width, divider->div_flags);
+	}
+
+	pr_debug("--> %s: divider_round_rate: val = %ld\n",
+		clk_hw_get_name(hw), ret_rate);
+	return ret_rate;
+}
+
+static int sg2042_clk_divider_set_rate(
+	struct clk_hw *hw,
+	unsigned long rate,
+	unsigned long parent_rate)
+{
+	unsigned int value;
+	unsigned int val, val2;
+	unsigned long flags = 0;
+	struct sg2042_divider_clock *divider = to_sg2042_clk_divider(hw);
+
+	value = divider_get_val(rate, parent_rate, divider->table,
+				divider->width, divider->div_flags);
+
+	if (divider->lock)
+		spin_lock_irqsave(divider->lock, flags);
+	else
+		__acquire(divider->lock);
+
+	/* div assert */
+	val = readl(divider->reg);
+	val &= ~0x1;
+	writel(val, divider->reg);
+
+	if (divider->div_flags & CLK_DIVIDER_HIWORD_MASK) {
+		val = div_mask(divider->width) << (divider->shift + 16);
+	} else {
+		val = readl(divider->reg);
+		val &= ~(div_mask(divider->width) << divider->shift);
+	}
+
+	val |= value << divider->shift;
+	writel(val, divider->reg);
+	val2 = val;
+
+	if (!(divider->div_flags & CLK_DIVIDER_READ_ONLY))
+		val |= 1 << 3;
+
+	/* de-assert */
+	val |= 1;
+	writel(val, divider->reg);
+	if (divider->lock)
+		spin_unlock_irqrestore(divider->lock, flags);
+	else
+		__release(divider->lock);
+
+	pr_debug("--> %s: divider_set_rate: register val = 0x%x\n",
+		clk_hw_get_name(hw), val2);
+	return 0;
+}
+
+static const struct clk_ops sg2042_clk_divider_ops = {
+	.recalc_rate = sg2042_clk_divider_recalc_rate,
+	.round_rate = sg2042_clk_divider_round_rate,
+	.set_rate = sg2042_clk_divider_set_rate,
+};
+
+static const struct clk_ops sg2042_clk_divider_ro_ops = {
+	.recalc_rate = sg2042_clk_divider_recalc_rate,
+	.round_rate = sg2042_clk_divider_round_rate,
+};
+
+static const struct clk_ops sg2042_clk_pll_ops = {
+	.recalc_rate = sg2042_clk_pll_recalc_rate,
+	.round_rate = sg2042_clk_pll_round_rate,
+	.determine_rate = sg2042_clk_pll_determine_rate,
+	.set_rate = sg2042_clk_pll_set_rate,
+};
+
+static const struct clk_ops sg2042_clk_pll_ro_ops = {
+	.recalc_rate = sg2042_clk_pll_recalc_rate,
+	.round_rate = sg2042_clk_pll_round_rate,
+};
+
+#define SG2042_PLL(_id, _name, _parent_name, _r_stat, _r_enable, _r_ctrl, _shift) \
+	{								\
+		.hw.init = CLK_HW_INIT_PARENTS(				\
+				_name,					\
+				(const char *[]){_parent_name},		\
+				&sg2042_clk_pll_ops,			\
+				CLK_GET_RATE_NOCACHE | CLK_GET_ACCURACY_NOCACHE),\
+		.id = _id,						\
+		.name = _name,						\
+		.offset_ctrl = _r_ctrl,					\
+		.offset_status = _r_stat,				\
+		.offset_enable = _r_enable,				\
+		.shift_status_lock = 8 + _shift,			\
+		.shift_status_updating = _shift,			\
+		.shift_enable = _shift,					\
+	}
+
+#define SG2042_PLL_RO(_id, _name, _parent_name, _r_stat, _r_enable, _r_ctrl, _shift) \
+	{								\
+		.hw.init = CLK_HW_INIT_PARENTS(				\
+				_name,					\
+				(const char *[]){_parent_name},		\
+				&sg2042_clk_pll_ro_ops,			\
+				CLK_GET_RATE_NOCACHE | CLK_GET_ACCURACY_NOCACHE),\
+		.id = _id,						\
+		.name = _name,						\
+		.offset_ctrl = _r_ctrl,					\
+		.offset_status = _r_stat,				\
+		.offset_enable = _r_enable,				\
+		.shift_status_lock = 8 + _shift,			\
+		.shift_status_updating = _shift,			\
+		.shift_enable = _shift,					\
+	}
+
+static struct sg2042_pll_clock sg2042_pll_clks[] = {
+	SG2042_PLL_RO(FPLL_CLK, "fpll_clock", "cgi",
+		R_PLL_STAT, R_PLL_CLKEN_CONTROL, R_FPLL_CONTROL, 3),
+	SG2042_PLL_RO(DPLL0_CLK, "dpll0_clock", "cgi",
+		R_PLL_STAT, R_PLL_CLKEN_CONTROL, R_DPLL0_CONTROL, 4),
+	SG2042_PLL_RO(DPLL1_CLK, "dpll1_clock", "cgi",
+		R_PLL_STAT, R_PLL_CLKEN_CONTROL, R_DPLL1_CONTROL, 5),
+	SG2042_PLL(MPLL_CLK, "mpll_clock", "cgi",
+		R_PLL_STAT, R_PLL_CLKEN_CONTROL, R_MPLL_CONTROL, 0),
+};
+
+#define SG2042_DIV(_id, _name, _parent_name,				\
+		  _r_ctrl, _shift, _width,				\
+		  _div_flag, _init_val) {				\
+		.hw.init = CLK_HW_INIT_PARENTS(				\
+				_name,					\
+				(const char *[]){_parent_name},		\
+				&sg2042_clk_divider_ops,		\
+				0),					\
+		.id = _id,						\
+		.name = _name,						\
+		.offset_ctrl = _r_ctrl,					\
+		.shift = _shift,					\
+		.width = _width,					\
+		.div_flags = _div_flag,					\
+		.initial_val = _init_val,				\
+		.table = NULL,						\
+	}
+
+#define SG2042_DIV_RO(_id, _name, _parent_name,				\
+		  _r_ctrl, _shift, _width,				\
+		  _div_flag, _init_val) {				\
+		.hw.init = CLK_HW_INIT_PARENTS(				\
+				_name,					\
+				(const char *[]){_parent_name},		\
+				&sg2042_clk_divider_ro_ops,		\
+				0),					\
+		.id = _id,						\
+		.name = _name,						\
+		.offset_ctrl = _r_ctrl,					\
+		.shift = _shift,					\
+		.width = _width,					\
+		.div_flags = _div_flag,					\
+		.initial_val = _init_val,				\
+		.table = NULL,						\
+	}
+
+/*
+ * DIV items in the array are sorted according to the clock-tree diagram,
+ * from top to bottom, from upstream to downstream. Read TRM for details.
+ */
+#define DEF_DIVFLAG (CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO)
+static struct sg2042_divider_clock sg2042_div_clks[] = {
+	SG2042_DIV_RO(DIV_CLK_DPLL0_DDR01_0,
+		"clk_div_ddr01_0", "clk_gate_ddr01_div0",
+		R_CLKDIVREG27, 16, 5,
+		DEF_DIVFLAG | CLK_DIVIDER_READ_ONLY, -1),
+	SG2042_DIV_RO(DIV_CLK_FPLL_DDR01_1,
+		"clk_div_ddr01_1", "clk_gate_ddr01_div1",
+		R_CLKDIVREG28, 16, 5,
+		DEF_DIVFLAG | CLK_DIVIDER_READ_ONLY, -1),
+
+	SG2042_DIV_RO(DIV_CLK_DPLL1_DDR23_0,
+		"clk_div_ddr23_0", "clk_gate_ddr23_div0",
+		R_CLKDIVREG29, 16, 5,
+		DEF_DIVFLAG | CLK_DIVIDER_READ_ONLY, -1),
+	SG2042_DIV_RO(DIV_CLK_FPLL_DDR23_1,
+		"clk_div_ddr23_1", "clk_gate_ddr23_div1",
+		R_CLKDIVREG30, 16, 5,
+		DEF_DIVFLAG | CLK_DIVIDER_READ_ONLY, -1),
+
+	SG2042_DIV(DIV_CLK_MPLL_RP_CPU_NORMAL_0,
+		"clk_div_rp_cpu_normal_0", "clk_gate_rp_cpu_normal_div0",
+		R_CLKDIVREG0, 16, 5, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_RP_CPU_NORMAL_1,
+		"clk_div_rp_cpu_normal_1", "clk_gate_rp_cpu_normal_div1",
+		R_CLKDIVREG1, 16, 5, DEF_DIVFLAG, 0),
+
+	SG2042_DIV(DIV_CLK_MPLL_AXI_DDR_0,
+		"clk_div_axi_ddr_0", "clk_gate_axi_ddr_div0",
+		R_CLKDIVREG25, 16, 5, DEF_DIVFLAG, 5),
+	SG2042_DIV(DIV_CLK_FPLL_AXI_DDR_1,
+		"clk_div_axi_ddr_1", "clk_gate_axi_ddr_div1",
+		R_CLKDIVREG26, 16, 5, DEF_DIVFLAG, 5),
+
+	SG2042_DIV(DIV_CLK_FPLL_TOP_RP_CMN_DIV2,
+		"clk_div_top_rp_cmn_div2", "clk_mux_rp_cpu_normal",
+		R_CLKDIVREG3, 16, 16, DEF_DIVFLAG, 0),
+
+	SG2042_DIV(DIV_CLK_FPLL_50M_A53, "clk_div_50m_a53", "fpll_clock",
+		R_CLKDIVREG2, 16, 8, DEF_DIVFLAG, 0),
+	/* downstream of div_50m_a53 */
+	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER1, "clk_div_timer1", "clk_div_50m_a53",
+		R_CLKDIVREG6, 16, 16, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER2, "clk_div_timer2", "clk_div_50m_a53",
+		R_CLKDIVREG7, 16, 16, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER3, "clk_div_timer3", "clk_div_50m_a53",
+		R_CLKDIVREG8, 16, 16, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER4, "clk_div_timer4", "clk_div_50m_a53",
+		R_CLKDIVREG9, 16, 16, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER5, "clk_div_timer5", "clk_div_50m_a53",
+		R_CLKDIVREG10, 16, 16, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER6, "clk_div_timer6", "clk_div_50m_a53",
+		R_CLKDIVREG11, 16, 16, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER7, "clk_div_timer7", "clk_div_50m_a53",
+		R_CLKDIVREG12, 16, 16, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_DIV_TIMER8, "clk_div_timer8", "clk_div_50m_a53",
+		R_CLKDIVREG13, 16, 16, DEF_DIVFLAG, 0),
+
+	SG2042_DIV_RO(DIV_CLK_FPLL_UART_500M, "clk_div_uart_500m", "fpll_clock",
+		R_CLKDIVREG4, 16, 7,
+		CLK_DIVIDER_READ_ONLY, 0),
+	SG2042_DIV(DIV_CLK_FPLL_AHB_LPC, "clk_div_ahb_lpc", "fpll_clock",
+		R_CLKDIVREG5, 16, 16, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_EFUSE, "clk_div_efuse", "fpll_clock",
+		R_CLKDIVREG14, 16, 7, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_TX_ETH0, "clk_div_tx_eth0", "fpll_clock",
+		R_CLKDIVREG16, 16, 11, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_PTP_REF_I_ETH0,
+		"clk_div_ptp_ref_i_eth0", "fpll_clock",
+		R_CLKDIVREG17, 16, 8, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_REF_ETH0, "clk_div_ref_eth0", "fpll_clock",
+		R_CLKDIVREG18, 16, 8, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_EMMC, "clk_div_emmc", "fpll_clock",
+		R_CLKDIVREG19, 16, 5, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_SD, "clk_div_sd", "fpll_clock",
+		R_CLKDIVREG21, 16, 5, DEF_DIVFLAG, 0),
+
+	SG2042_DIV(DIV_CLK_FPLL_TOP_AXI0, "clk_div_top_axi0", "fpll_clock",
+		R_CLKDIVREG23, 16, 5, DEF_DIVFLAG, 0),
+	/* downstream of div_top_axi0 */
+	SG2042_DIV(DIV_CLK_FPLL_100K_EMMC, "clk_div_100k_emmc", "clk_div_top_axi0",
+		R_CLKDIVREG20, 16, 16, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_100K_SD, "clk_div_100k_sd", "clk_div_top_axi0",
+		R_CLKDIVREG22, 16, 16, DEF_DIVFLAG, 0),
+	SG2042_DIV(DIV_CLK_FPLL_GPIO_DB, "clk_div_gpio_db", "clk_div_top_axi0",
+		R_CLKDIVREG15, 16, 16, DEF_DIVFLAG, 0),
+
+	SG2042_DIV(DIV_CLK_FPLL_TOP_AXI_HSPERI,
+		"clk_div_top_axi_hsperi", "fpll_clock",
+		R_CLKDIVREG24, 16, 5, DEF_DIVFLAG, 0),
+};
+
+#define SG2042_GATE(_id, _name, _parent_name, _flags, _r_enable, _bit_idx) { \
+		.id = _id,			\
+		.name = _name,			\
+		.parent_name = _parent_name,	\
+		.flags = _flags,		\
+		.offset_enable = _r_enable,	\
+		.bit_idx = _bit_idx,		\
+	}
+
+/*
+ * GATE items in the array are sorted according to the clock-tree diagram,
+ * from top to bottom, from upstream to downstream. Read TRM for details.
+ */
+static const struct sg2042_gate_clock sg2042_gate_clks[] = {
+	SG2042_GATE(GATE_CLK_DDR01_DIV0, "clk_gate_ddr01_div0", "dpll0_clock",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
+		R_CLKDIVREG27, 4),
+	SG2042_GATE(GATE_CLK_DDR01_DIV1, "clk_gate_ddr01_div1", "fpll_clock",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL,
+		R_CLKDIVREG28, 4),
+
+	SG2042_GATE(GATE_CLK_DDR23_DIV0, "clk_gate_ddr23_div0", "dpll1_clock",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED,
+		R_CLKDIVREG29, 4),
+	SG2042_GATE(GATE_CLK_DDR23_DIV1, "clk_gate_ddr23_div1", "fpll_clock",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL,
+		R_CLKDIVREG30, 4),
+
+	SG2042_GATE(GATE_CLK_RP_CPU_NORMAL_DIV0, "clk_gate_rp_cpu_normal_div0", "mpll_clock",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED | CLK_IS_CRITICAL,
+		R_CLKDIVREG0, 4),
+	SG2042_GATE(GATE_CLK_RP_CPU_NORMAL_DIV1,
+		"clk_gate_rp_cpu_normal_div1", "fpll_clock",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL,
+		R_CLKDIVREG1, 4),
+
+	SG2042_GATE(GATE_CLK_AXI_DDR_DIV0, "clk_gate_axi_ddr_div0", "mpll_clock",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED | CLK_IS_CRITICAL,
+		R_CLKDIVREG25, 4),
+	SG2042_GATE(GATE_CLK_AXI_DDR_DIV1, "clk_gate_axi_ddr_div1", "fpll_clock",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL,
+		R_CLKDIVREG26, 4),
+
+	/* upon are gate clocks as input source for the muxes */
+
+	SG2042_GATE(GATE_CLK_DDR01, "clk_gate_ddr01", "clk_mux_ddr01",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED | CLK_IS_CRITICAL,
+		R_CLKENREG1, 14),
+
+	SG2042_GATE(GATE_CLK_DDR23, "clk_gate_ddr23", "clk_mux_ddr23",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED | CLK_IS_CRITICAL,
+		R_CLKENREG1, 15),
+
+	SG2042_GATE(GATE_CLK_RP_CPU_NORMAL,
+		"clk_gate_rp_cpu_normal", "clk_mux_rp_cpu_normal",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED | CLK_IS_CRITICAL,
+		R_CLKENREG0, 0),
+
+	SG2042_GATE(GATE_CLK_AXI_DDR, "clk_gate_axi_ddr", "clk_mux_axi_ddr",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED | CLK_IS_CRITICAL,
+		R_CLKENREG1, 13),
+
+	/* upon are gate clocks directly downstream of muxes */
+
+	/* downstream of clk_div_top_rp_cmn_div2 */
+	SG2042_GATE(GATE_CLK_TOP_RP_CMN_DIV2,
+		"clk_gate_top_rp_cmn_div2", "clk_div_top_rp_cmn_div2",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, R_CLKENREG0, 2),
+	SG2042_GATE(GATE_CLK_HSDMA, "clk_gate_hsdma", "clk_gate_top_rp_cmn_div2",
+		CLK_SET_RATE_PARENT, R_CLKENREG1, 10),
+
+	/*
+	 * downstream of clk_gate_rp_cpu_normal
+	 *
+	 * FIXME: there should be one 1/2 DIV between clk_gate_rp_cpu_normal
+	 * and clk_gate_axi_pcie0/clk_gate_axi_pcie1.
+	 * But the 1/2 DIV is fixed and no configurable register exported, so
+	 * when reading from these two clocks, the rate value are still the
+	 * same as that of clk_gate_rp_cpu_normal, it's not correct.
+	 * This just affects the value read.
+	 */
+	SG2042_GATE(GATE_CLK_AXI_PCIE0,
+		"clk_gate_axi_pcie0", "clk_gate_rp_cpu_normal",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, R_CLKENREG1, 8),
+	SG2042_GATE(GATE_CLK_AXI_PCIE1,
+		"clk_gate_axi_pcie1", "clk_gate_rp_cpu_normal",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, R_CLKENREG1, 9),
+
+	/* downstream of div_50m_a53 */
+	SG2042_GATE(GATE_CLK_A53_50M, "clk_gate_a53_50m", "clk_div_50m_a53",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, R_CLKENREG0, 1),
+	SG2042_GATE(GATE_CLK_TIMER1, "clk_gate_timer1", "clk_div_timer1",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 12),
+	SG2042_GATE(GATE_CLK_TIMER2, "clk_gate_timer2", "clk_div_timer2",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 13),
+	SG2042_GATE(GATE_CLK_TIMER3, "clk_gate_timer3", "clk_div_timer3",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 14),
+	SG2042_GATE(GATE_CLK_TIMER4, "clk_gate_timer4", "clk_div_timer4",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 15),
+	SG2042_GATE(GATE_CLK_TIMER5, "clk_gate_timer5", "clk_div_timer5",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 16),
+	SG2042_GATE(GATE_CLK_TIMER6, "clk_gate_timer6", "clk_div_timer6",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 17),
+	SG2042_GATE(GATE_CLK_TIMER7, "clk_gate_timer7", "clk_div_timer7",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 18),
+	SG2042_GATE(GATE_CLK_TIMER8, "clk_gate_timer8", "clk_div_timer8",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 19),
+
+	/* gate clocks downstream from div clocks one-to-one */
+	SG2042_GATE(GATE_CLK_UART_500M, "clk_gate_uart_500m", "clk_div_uart_500m",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, R_CLKENREG0, 4),
+	SG2042_GATE(GATE_CLK_AHB_LPC, "clk_gate_ahb_lpc", "clk_div_ahb_lpc",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 7),
+	SG2042_GATE(GATE_CLK_EFUSE, "clk_gate_efuse", "clk_div_efuse",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 20),
+	SG2042_GATE(GATE_CLK_TX_ETH0, "clk_gate_tx_eth0", "clk_div_tx_eth0",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 30),
+	SG2042_GATE(GATE_CLK_PTP_REF_I_ETH0,
+		"clk_gate_ptp_ref_i_eth0", "clk_div_ptp_ref_i_eth0",
+		CLK_SET_RATE_PARENT, R_CLKENREG1, 0),
+	SG2042_GATE(GATE_CLK_REF_ETH0, "clk_gate_ref_eth0", "clk_div_ref_eth0",
+		CLK_SET_RATE_PARENT, R_CLKENREG1, 1),
+	SG2042_GATE(GATE_CLK_EMMC_100M, "clk_gate_emmc", "clk_div_emmc",
+		CLK_SET_RATE_PARENT, R_CLKENREG1, 3),
+	SG2042_GATE(GATE_CLK_SD_100M, "clk_gate_sd", "clk_div_sd",
+		CLK_SET_RATE_PARENT, R_CLKENREG1, 6),
+
+	/* downstream of clk_div_top_axi0 */
+	SG2042_GATE(GATE_CLK_AHB_ROM, "clk_gate_ahb_rom", "clk_div_top_axi0",
+		 0, R_CLKENREG0, 8),
+	SG2042_GATE(GATE_CLK_AHB_SF, "clk_gate_ahb_sf", "clk_div_top_axi0",
+		0, R_CLKENREG0, 9),
+	SG2042_GATE(GATE_CLK_AXI_SRAM, "clk_gate_axi_sram", "clk_div_top_axi0",
+		CLK_IGNORE_UNUSED, R_CLKENREG0, 10),
+	SG2042_GATE(GATE_CLK_APB_TIMER, "clk_gate_apb_timer", "clk_div_top_axi0",
+		CLK_IGNORE_UNUSED, R_CLKENREG0, 11),
+	SG2042_GATE(GATE_CLK_APB_EFUSE, "clk_gate_apb_efuse", "clk_div_top_axi0",
+		0, R_CLKENREG0, 21),
+	SG2042_GATE(GATE_CLK_APB_GPIO, "clk_gate_apb_gpio", "clk_div_top_axi0",
+		0, R_CLKENREG0, 22),
+	SG2042_GATE(GATE_CLK_APB_GPIO_INTR,
+		"clk_gate_apb_gpio_intr", "clk_div_top_axi0",
+		0, R_CLKENREG0, 23),
+	SG2042_GATE(GATE_CLK_APB_I2C, "clk_gate_apb_i2c", "clk_div_top_axi0",
+		0, R_CLKENREG0, 26),
+	SG2042_GATE(GATE_CLK_APB_WDT, "clk_gate_apb_wdt", "clk_div_top_axi0",
+		0, R_CLKENREG0, 27),
+	SG2042_GATE(GATE_CLK_APB_PWM, "clk_gate_apb_pwm", "clk_div_top_axi0",
+		0, R_CLKENREG0, 28),
+	SG2042_GATE(GATE_CLK_APB_RTC, "clk_gate_apb_rtc", "clk_div_top_axi0",
+		0, R_CLKENREG0, 29),
+	SG2042_GATE(GATE_CLK_TOP_AXI0, "clk_gate_top_axi0", "clk_div_top_axi0",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_CLKENREG1, 11),
+	/* downstream of DIV clocks which are sourced from clk_div_top_axi0 */
+	SG2042_GATE(GATE_CLK_GPIO_DB, "clk_gate_gpio_db", "clk_div_gpio_db",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 24),
+	SG2042_GATE(GATE_CLK_100K_EMMC, "clk_gate_100k_emmc", "clk_div_100k_emmc",
+		CLK_SET_RATE_PARENT, R_CLKENREG1, 4),
+	SG2042_GATE(GATE_CLK_100K_SD, "clk_gate_100k_sd", "clk_div_100k_sd",
+		CLK_SET_RATE_PARENT, R_CLKENREG1, 7),
+
+	/* downstream of clk_div_top_axi_hsperi */
+	SG2042_GATE(GATE_CLK_SYSDMA_AXI,
+		"clk_gate_sysdma_axi", "clk_div_top_axi_hsperi",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 3),
+	SG2042_GATE(GATE_CLK_APB_UART,
+		"clk_gate_apb_uart", "clk_div_top_axi_hsperi",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 5),
+	SG2042_GATE(GATE_CLK_AXI_DBG_I2C,
+		"clk_gate_axi_dbg_i2c", "clk_div_top_axi_hsperi",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 6),
+	SG2042_GATE(GATE_CLK_APB_SPI,
+		"clk_gate_apb_spi", "clk_div_top_axi_hsperi",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 25),
+	SG2042_GATE(GATE_CLK_AXI_ETH0,
+		"clk_gate_axi_eth0", "clk_div_top_axi_hsperi",
+		CLK_SET_RATE_PARENT, R_CLKENREG0, 31),
+	SG2042_GATE(GATE_CLK_AXI_EMMC,
+		"clk_gate_axi_emmc", "clk_div_top_axi_hsperi",
+		CLK_SET_RATE_PARENT, R_CLKENREG1, 2),
+	SG2042_GATE(GATE_CLK_AXI_SD,
+		"clk_gate_axi_sd", "clk_div_top_axi_hsperi",
+		CLK_SET_RATE_PARENT, R_CLKENREG1, 5),
+	SG2042_GATE(GATE_CLK_TOP_AXI_HSPERI,
+		"clk_gate_top_axi_hsperi", "clk_div_top_axi_hsperi",
+		CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_CLKENREG1, 12),
+
+	/* downstream of clk_gate_rp_cpu_normal about rxu */
+	SG2042_GATE(GATE_CLK_RXU0, "clk_gate_rxu0", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 0),
+	SG2042_GATE(GATE_CLK_RXU1, "clk_gate_rxu1", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 1),
+	SG2042_GATE(GATE_CLK_RXU2, "clk_gate_rxu2", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 2),
+	SG2042_GATE(GATE_CLK_RXU3, "clk_gate_rxu3", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 3),
+	SG2042_GATE(GATE_CLK_RXU4, "clk_gate_rxu4", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 4),
+	SG2042_GATE(GATE_CLK_RXU5, "clk_gate_rxu5", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 5),
+	SG2042_GATE(GATE_CLK_RXU6, "clk_gate_rxu6", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 6),
+	SG2042_GATE(GATE_CLK_RXU7, "clk_gate_rxu7", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 7),
+	SG2042_GATE(GATE_CLK_RXU8, "clk_gate_rxu8", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 8),
+	SG2042_GATE(GATE_CLK_RXU9, "clk_gate_rxu9", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 9),
+	SG2042_GATE(GATE_CLK_RXU10, "clk_gate_rxu10", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 10),
+	SG2042_GATE(GATE_CLK_RXU11, "clk_gate_rxu11", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 11),
+	SG2042_GATE(GATE_CLK_RXU12, "clk_gate_rxu12", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 12),
+	SG2042_GATE(GATE_CLK_RXU13, "clk_gate_rxu13", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 13),
+	SG2042_GATE(GATE_CLK_RXU14, "clk_gate_rxu14", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 14),
+	SG2042_GATE(GATE_CLK_RXU15, "clk_gate_rxu15", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 15),
+	SG2042_GATE(GATE_CLK_RXU16, "clk_gate_rxu16", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 16),
+	SG2042_GATE(GATE_CLK_RXU17, "clk_gate_rxu17", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 17),
+	SG2042_GATE(GATE_CLK_RXU18, "clk_gate_rxu18", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 18),
+	SG2042_GATE(GATE_CLK_RXU19, "clk_gate_rxu19", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 19),
+	SG2042_GATE(GATE_CLK_RXU20, "clk_gate_rxu20", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 20),
+	SG2042_GATE(GATE_CLK_RXU21, "clk_gate_rxu21", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 21),
+	SG2042_GATE(GATE_CLK_RXU22, "clk_gate_rxu22", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 22),
+	SG2042_GATE(GATE_CLK_RXU23, "clk_gate_rxu23", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 23),
+	SG2042_GATE(GATE_CLK_RXU24, "clk_gate_rxu24", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 24),
+	SG2042_GATE(GATE_CLK_RXU25, "clk_gate_rxu25", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 25),
+	SG2042_GATE(GATE_CLK_RXU26, "clk_gate_rxu26", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 26),
+	SG2042_GATE(GATE_CLK_RXU27, "clk_gate_rxu27", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 27),
+	SG2042_GATE(GATE_CLK_RXU28, "clk_gate_rxu28", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 28),
+	SG2042_GATE(GATE_CLK_RXU29, "clk_gate_rxu29", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 29),
+	SG2042_GATE(GATE_CLK_RXU30, "clk_gate_rxu30", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 30),
+	SG2042_GATE(GATE_CLK_RXU31, "clk_gate_rxu31", "clk_gate_rp_cpu_normal",
+		0, R_RP_RXU_CLK_ENABLE, 31),
+
+	/* downstream of clk_gate_rp_cpu_normal about mp */
+	SG2042_GATE(GATE_CLK_MP0, "clk_gate_mp0", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP0_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP1, "clk_gate_mp1", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP1_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP2, "clk_gate_mp2", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP2_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP3, "clk_gate_mp3", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP3_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP4, "clk_gate_mp4", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP4_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP5, "clk_gate_mp5", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP5_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP6, "clk_gate_mp6", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP6_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP7, "clk_gate_mp7", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP7_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP8, "clk_gate_mp8", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP8_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP9, "clk_gate_mp9", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP9_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP10, "clk_gate_mp10", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP10_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP11, "clk_gate_mp11", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP11_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP12, "clk_gate_mp12", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP12_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP13, "clk_gate_mp13", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP13_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP14, "clk_gate_mp14", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP14_CONTROL_REG, 0),
+	SG2042_GATE(GATE_CLK_MP15, "clk_gate_mp15", "clk_gate_rp_cpu_normal",
+		CLK_IGNORE_UNUSED | CLK_IS_CRITICAL, R_MP15_CONTROL_REG, 0),
+};
+
+#define SG2042_MUX(_id, _name, _parent_names, _flags, _r_select, _shift, _width) { \
+		.id = _id,					\
+		.name = _name,					\
+		.parent_names = _parent_names,			\
+		.num_parents = ARRAY_SIZE(_parent_names),	\
+		.flags = _flags,				\
+		.offset_select = _r_select,			\
+		.shift = _shift,				\
+		.width = _width,				\
+	}
+
+/*
+ * Note: regarding names for mux clock, "0/1" or "div0/div1" means the
+ * first/second parent input source, not the register value.
+ * For example:
+ * "clk_div_ddr01_0" is the name of Clock divider 0 control of DDR01, and
+ * "clk_gate_ddr01_div0" is the gate clock in front of the "clk_div_ddr01_0",
+ * they are both controlled by register CLKDIVREG27;
+ * "clk_div_ddr01_1" is the name of Clock divider 1 control of DDR01, and
+ * "clk_gate_ddr01_div1" is the gate clock in front of the "clk_div_ddr01_1",
+ * they are both controlled by register CLKDIVREG28;
+ * While for register value of mux selection, use Clock Select for DDR01’s clock
+ * as example, see CLKSELREG0, bit[2].
+ * 1: Select in_dpll0_clk as clock source, correspondng to the parent input
+ *    source from "clk_div_ddr01_0".
+ * 0: Select in_fpll_clk as clock source, corresponding to the parent input
+ *    source from "clk_div_ddr01_1".
+ * So we need a table to define the array of register values corresponding to
+ * the parent index and tell CCF about this when registering mux clock.
+ */
+static const u32 sg2042_mux_table[] = {1, 0};
+
+static const char *const clk_mux_ddr01_p[] = {
+			"clk_div_ddr01_0", "clk_div_ddr01_1"};
+static const char *const clk_mux_ddr23_p[] = {
+			"clk_div_ddr23_0", "clk_div_ddr23_1"};
+static const char *const clk_mux_rp_cpu_normal_p[] = {
+			"clk_div_rp_cpu_normal_0", "clk_div_rp_cpu_normal_1"};
+static const char *const clk_mux_axi_ddr_p[] = {
+			"clk_div_axi_ddr_0", "clk_div_axi_ddr_1"};
+
+static struct sg2042_mux_clock sg2042_mux_clks[] = {
+	SG2042_MUX(MUX_CLK_DDR01, "clk_mux_ddr01", clk_mux_ddr01_p,
+		CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT | CLK_MUX_READ_ONLY,
+		R_CLKSELREG0, 2, 1),
+	SG2042_MUX(MUX_CLK_DDR23, "clk_mux_ddr23", clk_mux_ddr23_p,
+		CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT | CLK_MUX_READ_ONLY,
+		R_CLKSELREG0, 3, 1),
+	SG2042_MUX(MUX_CLK_RP_CPU_NORMAL, "clk_mux_rp_cpu_normal", clk_mux_rp_cpu_normal_p,
+		CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT,
+		R_CLKSELREG0, 0, 1),
+	SG2042_MUX(MUX_CLK_AXI_DDR, "clk_mux_axi_ddr", clk_mux_axi_ddr_p,
+		CLK_SET_RATE_PARENT | CLK_SET_RATE_NO_REPARENT,
+		R_CLKSELREG0, 1, 1),
+};
+
+DEFINE_SPINLOCK(sg2042_clk_lock);
+
+static int sg2042_clk_register_plls(struct sg2042_clk_data *clk_data,
+				   struct sg2042_pll_clock pll_clks[],
+				   int num_pll_clks)
+{
+	struct clk_hw *hw;
+	struct sg2042_pll_clock *pll;
+	int i, ret = 0;
+
+	for (i = 0; i < num_pll_clks; i++) {
+		pll = &(pll_clks[i]);
+		/* assign these for ops usage during registration */
+		pll->map = clk_data->syscon;
+		pll->lock = &sg2042_clk_lock;
+
+		hw = &pll->hw;
+		ret = clk_hw_register(NULL, hw);
+		if (ret) {
+			pr_err("failed to register clock %s\n", pll->name);
+			break;
+		}
+
+		dbg_info("registered [%d : %s]\n", pll->id, pll->name);
+		clk_data->onecell_data.hws[pll->id] = hw;
+	}
+
+	/* leave unregister to outside if failed */
+	return ret;
+}
+
+static int sg2042_clk_register_divs(struct sg2042_clk_data *clk_data,
+				   struct sg2042_divider_clock div_clks[],
+				   int num_div_clks)
+{
+	struct clk_hw *hw;
+	struct sg2042_divider_clock *div;
+	int i, val, ret = 0;
+
+	for (i = 0; i < num_div_clks; i++) {
+		div = &(div_clks[i]);
+
+		if (div->div_flags & CLK_DIVIDER_HIWORD_MASK) {
+			if (div->width + div->shift > 16) {
+				pr_warn("divider value exceeds LOWORD field\n");
+				ret = -EINVAL;
+				break;
+			}
+		}
+
+		div->reg = clk_data->iobase + div->offset_ctrl;
+		div->lock = &sg2042_clk_lock;
+
+		hw = &div->hw;
+		ret = clk_hw_register(NULL, hw);
+		if (ret) {
+			pr_err("failed to register clock %s\n", div->name);
+			break;
+		}
+
+		dbg_info("registered [%d : %s]\n", div->id, div->name);
+		clk_data->onecell_data.hws[div->id] = hw;
+
+		if (div->initial_val >= 0) {
+			regmap_read(clk_data->syscon, div->offset_ctrl, &val);
+
+			/*
+			 * set a default divider factor,
+			 * clk driver should not select divider clock as the
+			 * clock source, before set the divider by right process
+			 * (assert div, set div factor, de assert div).
+			 */
+			if (div->initial_val > 0)
+				val |= (div->initial_val << 16 | 1 << 3);
+			else {
+				/*
+				 * the div register is config to use divider
+				 * factor, don't change divider
+				 */
+				if (!(val >> 3 & 0x1))
+					val |= 1 << 16;
+			}
+
+			regmap_write(clk_data->syscon, div->offset_ctrl, val);
+		}
+	}
+
+	/* leave unregister to outside if failed */
+	return ret;
+}
+
+static int sg2042_clk_register_gates(struct sg2042_clk_data *clk_data,
+				    const struct sg2042_gate_clock gate_clks[],
+				    int num_gate_clks)
+{
+	struct clk_hw *hw;
+	const struct sg2042_gate_clock *gate;
+	int i, ret = 0;
+
+	for (i = 0; i < num_gate_clks; i++) {
+		gate = &(gate_clks[i]);
+		hw = clk_hw_register_gate(
+			NULL,
+			gate->name,
+			gate->parent_name,
+			gate->flags,
+			clk_data->iobase + gate->offset_enable,
+			gate->bit_idx,
+			0,
+			&sg2042_clk_lock);
+		if (IS_ERR(hw)) {
+			pr_err("failed to register clock %s\n", gate->name);
+			ret = PTR_ERR(hw);
+			break;
+		}
+
+		dbg_info("registered [%d : %s]\n", gate->id, gate->name);
+		clk_data->onecell_data.hws[gate->id] = hw;
+	}
+
+	/* leave unregister to outside if failed */
+	return ret;
+}
+
+static int sg2042_mux_notifier_cb(struct notifier_block *nb,
+				unsigned long event, void *data)
+{
+	int ret = 0;
+	struct clk_notifier_data *ndata = data;
+	struct clk_hw *hw = __clk_get_hw(ndata->clk);
+	const struct clk_ops *ops = &clk_mux_ops;
+	struct sg2042_mux_clock *mux = to_sg2042_mux_nb(nb);
+
+	/* To switch to fpll before changing rate and restore after that */
+	if (event == PRE_RATE_CHANGE) {
+		mux->original_index = ops->get_parent(hw);
+		dbg_info("%s: trying to switch parent from %d to 1\n",
+			clk_hw_get_name(hw), mux->original_index);
+		/*
+		 * "1" is the array index of the second parent input source of
+		 * mux. For SG2042, it's fpll for all mux clocks.
+		 * "0" is the array index of the frist parent input source of
+		 * mux, For SG2042, it's mpll.
+		 * FIXME, any good idea to avoid magic number?
+		 */
+		if (mux->original_index == 0)
+			ret = ops->set_parent(hw, 1);
+	} else if (event == POST_RATE_CHANGE) {
+		dbg_info("%s: switch parent from %d to %d\n",
+			clk_hw_get_name(hw),
+			ops->get_parent(hw),
+			mux->original_index);
+		ret = ops->set_parent(hw, mux->original_index);
+	}
+
+	return notifier_from_errno(ret);
+}
+
+static int sg2042_clk_register_muxs(struct sg2042_clk_data *clk_data,
+				   struct sg2042_mux_clock mux_clks[],
+				   int num_mux_clks)
+{
+	struct clk_hw *hw;
+	struct sg2042_mux_clock *mux;
+	int i, ret = 0;
+
+	for (i = 0; i < num_mux_clks; i++) {
+		mux = &(mux_clks[i]);
+
+		hw = clk_hw_register_mux_table(
+			NULL,
+			mux->name,
+			mux->parent_names,
+			mux->num_parents,
+			mux->flags,
+			clk_data->iobase + mux->offset_select,
+			mux->shift,
+			BIT(mux->width) - 1,
+			0,
+			sg2042_mux_table,
+			&sg2042_clk_lock);
+		if (IS_ERR(hw)) {
+			pr_err("failed to register clock %s\n", mux->name);
+			ret = PTR_ERR(hw);
+			break;
+		}
+
+		dbg_info("registered [%d : %s]\n", mux->id, mux->name);
+		clk_data->onecell_data.hws[mux->id] = hw;
+
+		/*
+		 * FIXME: Theoretically, we should set parent for the
+		 * mux, but seems hardware has done this for us with
+		 * default value, so we don't set parent again here.
+		 */
+
+		if (!(mux->flags & CLK_MUX_READ_ONLY)) {
+			mux->clk_nb.notifier_call = sg2042_mux_notifier_cb;
+			ret = clk_notifier_register(hw->clk, &(mux->clk_nb));
+			if (ret) {
+				pr_err("failed to register clock notifier for %s\n",
+					mux->name);
+				goto error_cleanup;
+			}
+		}
+	}
+
+	return 0;
+
+error_cleanup:
+	/* unregister notifier and release the memory allocated */
+	for (i = 0; i < num_mux_clks; i++) {
+		mux = &(mux_clks[i]);
+
+		hw = clk_data->onecell_data.hws[mux->id];
+
+		if (hw != NULL)
+			clk_notifier_unregister(hw->clk, &(mux->clk_nb));
+	}
+
+	/* leave clk unregister to outside if failed */
+	return ret;
+}
+
+static int __init sg2042_clk_init_clk_data(
+	struct device_node *node,
+	int num_clks,
+	struct sg2042_clk_data **pp_clk_data)
+{
+	int ret = 0;
+	struct sg2042_clk_data *clk_data = NULL;
+	struct device_node *np_syscon;
+
+	np_syscon = of_get_parent(node);
+	if (!np_syscon) {
+		pr_err("failed to get syscon node\n");
+		ret = -EINVAL;
+		goto error_out;
+	}
+
+	clk_data = kzalloc(struct_size(clk_data, onecell_data.hws, num_clks), GFP_KERNEL);
+	if (!clk_data) {
+		ret = -ENOMEM;
+		goto error_out;
+	}
+
+	clk_data->syscon = device_node_to_regmap(np_syscon);
+	if (IS_ERR_OR_NULL(clk_data->syscon)) {
+		pr_err("cannot get regmap(syscon) %ld\n", PTR_ERR(clk_data->syscon));
+		ret = -ENODEV;
+		goto cleanup;
+	}
+	clk_data->iobase = of_iomap(np_syscon, 0);
+	clk_data->onecell_data.num = num_clks;
+
+	*pp_clk_data = clk_data;
+	return ret;
+
+cleanup:
+	kfree(clk_data);
+
+error_out:
+	return ret;
+}
+
+static void __init sg2042_clk_init(struct device_node *node)
+{
+	struct sg2042_clk_data *clk_data = NULL;
+	int i, ret = 0;
+	int num_clks = 0;
+
+	num_clks = ARRAY_SIZE(sg2042_pll_clks) +
+		   ARRAY_SIZE(sg2042_div_clks) +
+		   ARRAY_SIZE(sg2042_gate_clks) +
+		   ARRAY_SIZE(sg2042_mux_clks);
+	if (num_clks == 0) {
+		ret = -EINVAL;
+		goto error_out;
+	}
+
+	ret = sg2042_clk_init_clk_data(node, num_clks, &clk_data);
+	if (ret < 0)
+		goto error_out;
+
+	ret = sg2042_clk_register_plls(clk_data, sg2042_pll_clks,
+				ARRAY_SIZE(sg2042_pll_clks));
+	if (ret)
+		goto cleanup;
+
+	ret = sg2042_clk_register_divs(clk_data, sg2042_div_clks,
+				ARRAY_SIZE(sg2042_div_clks));
+	if (ret)
+		goto cleanup;
+
+	ret = sg2042_clk_register_gates(clk_data, sg2042_gate_clks,
+				ARRAY_SIZE(sg2042_gate_clks));
+	if (ret)
+		goto cleanup;
+
+	ret = sg2042_clk_register_muxs(clk_data, sg2042_mux_clks,
+				ARRAY_SIZE(sg2042_mux_clks));
+	if (ret)
+		goto cleanup;
+
+	for (i = 0; i < num_clks; i++)
+		dbg_info("provider [%d]: %s\n", i, clk_hw_get_name(clk_data->onecell_data.hws[i]));
+	ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, &clk_data->onecell_data);
+	if (ret)
+		goto cleanup;
+
+	return;
+
+cleanup:
+	for (i = 0; i < num_clks; i++) {
+		if (clk_data->onecell_data.hws[i] != NULL)
+			clk_hw_unregister(clk_data->onecell_data.hws[i]);
+	}
+	kfree(clk_data);
+
+error_out:
+	pr_err("%s failed error number %d\n", __func__, ret);
+}
+
+CLK_OF_DECLARE(sg2042_clk, "sophgo,sg2042-clkgen", sg2042_clk_init);
diff --git a/drivers/clk/sophgo/clk-sophgo-sg2042.h b/drivers/clk/sophgo/clk-sophgo-sg2042.h
new file mode 100644
index 000000000000..ca1c8b9a937a
--- /dev/null
+++ b/drivers/clk/sophgo/clk-sophgo-sg2042.h
@@ -0,0 +1,222 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __CLK_SOPHGO_SG2042_H
+#define __CLK_SOPHGO_SG2042_H
+
+#include <linux/regmap.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+
+#define R_PLL_STAT		0xC0
+#define R_PLL_CLKEN_CONTROL	0xC4
+#define R_MPLL_CONTROL		0xE8
+#define R_FPLL_CONTROL		0xF4
+#define R_DPLL0_CONTROL		0xF8
+#define R_DPLL1_CONTROL		0xFC
+
+#define R_CLKENREG0		0x2000
+#define R_CLKENREG1		0x2004
+#define R_CLKSELREG0		0x2020
+#define R_CLKDIVREG0		0x2040
+#define R_CLKDIVREG1		0x2044
+#define R_CLKDIVREG2		0x2048
+#define R_CLKDIVREG3		0x204C
+#define R_CLKDIVREG4		0x2050
+#define R_CLKDIVREG5		0x2054
+#define R_CLKDIVREG6		0x2058
+#define R_CLKDIVREG7		0x205C
+#define R_CLKDIVREG8		0x2060
+#define R_CLKDIVREG9		0x2064
+#define R_CLKDIVREG10		0x2068
+#define R_CLKDIVREG11		0x206C
+#define R_CLKDIVREG12		0x2070
+#define R_CLKDIVREG13		0x2074
+#define R_CLKDIVREG14		0x2078
+#define R_CLKDIVREG15		0x207C
+#define R_CLKDIVREG16		0x2080
+#define R_CLKDIVREG17		0x2084
+#define R_CLKDIVREG18		0x2088
+#define R_CLKDIVREG19		0x208C
+#define R_CLKDIVREG20		0x2090
+#define R_CLKDIVREG21		0x2094
+#define R_CLKDIVREG22		0x2098
+#define R_CLKDIVREG23		0x209C
+#define R_CLKDIVREG24		0x20A0
+#define R_CLKDIVREG25		0x20A4
+#define R_CLKDIVREG26		0x20A8
+#define R_CLKDIVREG27		0x20AC
+#define R_CLKDIVREG28		0x20B0
+#define R_CLKDIVREG29		0x20B4
+#define R_CLKDIVREG30		0x20B8
+
+#define R_RP_RXU_CLK_ENABLE	0x0368
+#define R_MP0_STATUS_REG	0x0380
+#define R_MP0_CONTROL_REG	0x0384
+#define R_MP1_STATUS_REG	0x0388
+#define R_MP1_CONTROL_REG	0x038C
+#define R_MP2_STATUS_REG	0x0390
+#define R_MP2_CONTROL_REG	0x0394
+#define R_MP3_STATUS_REG	0x0398
+#define R_MP3_CONTROL_REG	0x039C
+#define R_MP4_STATUS_REG	0x03A0
+#define R_MP4_CONTROL_REG	0x03A4
+#define R_MP5_STATUS_REG	0x03A8
+#define R_MP5_CONTROL_REG	0x03AC
+#define R_MP6_STATUS_REG	0x03B0
+#define R_MP6_CONTROL_REG	0x03B4
+#define R_MP7_STATUS_REG	0x03B8
+#define R_MP7_CONTROL_REG	0x03BC
+#define R_MP8_STATUS_REG	0x03C0
+#define R_MP8_CONTROL_REG	0x03C4
+#define R_MP9_STATUS_REG	0x03C8
+#define R_MP9_CONTROL_REG	0x03CC
+#define R_MP10_STATUS_REG	0x03D0
+#define R_MP10_CONTROL_REG	0x03D4
+#define R_MP11_STATUS_REG	0x03D8
+#define R_MP11_CONTROL_REG	0x03DC
+#define R_MP12_STATUS_REG	0x03E0
+#define R_MP12_CONTROL_REG	0x03E4
+#define R_MP13_STATUS_REG	0x03E8
+#define R_MP13_CONTROL_REG	0x03EC
+#define R_MP14_STATUS_REG	0x03F0
+#define R_MP14_CONTROL_REG	0x03F4
+#define R_MP15_STATUS_REG	0x03F8
+#define R_MP15_CONTROL_REG	0x03FC
+
+/*
+ * clock common data
+ * @iobase & @syscon: point to the same address (top of syscon), the reason
+ *  we use two different type of pointer just due to pll uses regmap while
+ *  others use iomem.
+ * @lock: clock register access lock
+ * @onecell_data: used for adding provider
+ */
+struct sg2042_clk_data {
+	void __iomem *iobase;
+	struct regmap *syscon;
+	struct clk_hw_onecell_data onecell_data;
+};
+
+/*
+ * PLL clock
+ * @id:				used to map clk_onecell_data
+ * @name:			used for print even when clk registration failed
+ * @map:			used for regmap read/write, regmap is more useful
+ *				then iomem address when we have multiple offsets
+ *				for different registers
+ * @lock:			spinlock to protect register access
+ * @offset_status:		offset of pll status registers
+ * @offset_enable:		offset of pll enable registers
+ * @offset_ctrl:		offset of pll control registers
+ * @shift_status_lock:		shift of XXX_LOCK in pll status register
+ * @shift_status_updating:	shift of UPDATING_XXX in pll status register
+ * @shift_enable:		shift of XXX_CLK_EN in pll enable register
+ */
+struct sg2042_pll_clock {
+	struct clk_hw	hw;
+
+	/* private data */
+	unsigned int id;
+	const char *name;
+
+	struct regmap *map;
+	spinlock_t *lock;
+
+	u32 offset_status;
+	u32 offset_enable;
+	u32 offset_ctrl;
+	u8 shift_status_lock;
+	u8 shift_status_updating;
+	u8 shift_enable;
+};
+
+#define to_sg2042_pll_clk(_hw) container_of(_hw, struct sg2042_pll_clock, hw)
+
+/*
+ * Divider clock
+ * @id:			used to map clk_onecell_data
+ * @name:		used for print even when clk registration failed
+ * @reg:		used for readl/writel.
+ * @lock:		spinlock to protect register access
+ * @offset_ctrl:	offset of divider control registers
+ * @shift:		shift of "Clock Divider Factor" in divider control register
+ * @width:		width of "Clock Divider Factor" in divider control register
+ * @div_flags:		private flags for this clock, not for framework-specific
+ * @initial_val:	initial value of the divider, a value < 0 means ignoring
+ *			setting of initial value.
+ * @table:		the div table that the divider supports
+ */
+struct sg2042_divider_clock {
+	struct clk_hw	hw;
+
+	/* private data */
+	unsigned int id;
+	const char *name;
+
+	void __iomem *reg;
+	spinlock_t *lock;
+
+	unsigned long offset_ctrl;
+	u8 shift;
+	u8 width;
+	u8 div_flags;
+	s32 initial_val;
+	struct clk_div_table *table;
+};
+
+#define to_sg2042_clk_divider(_hw)	\
+	container_of(_hw, struct sg2042_divider_clock, hw)
+
+/*
+ * Gate clock
+ * @id:			used to map clk_onecell_data
+ * @name:		string of this clock name
+ * @parent_name:	string of parent clock name
+ * @flags:		framework-specific flags for this clock
+ * @offset_enable:	offset of gate enable registers
+ * @bit_idx:		which bit in the register controls gating of this clock
+ */
+struct sg2042_gate_clock {
+	unsigned int id;
+	const char *name;
+	const char *parent_name;
+	unsigned long flags;
+	unsigned long offset_enable;
+	u8 bit_idx;
+};
+
+/*
+ * Gate clock
+ * @id:			used to map clk_onecell_data
+ * @name:		string of this clock name
+ * @parent_name:	string array of parents' clock name
+ * @flags:		framework-specific flags for this clock
+ * @offset_select:	offset of mux selection registers
+ * @shift:		shift of "Clock Select" in mux selection register
+ * @width:		width of "Clock Select" in mux selection register
+ * @clk_nb:		used for notification
+ * @original_index:	set by notifier callback
+ */
+struct sg2042_mux_clock {
+	unsigned int id;
+	const char *name;
+	const char * const *parent_names;
+	u8 num_parents;
+	unsigned long flags;
+	unsigned long offset_select;
+	u8 shift;
+	u8 width;
+	struct notifier_block clk_nb;
+	u8 original_index;
+};
+
+#define to_sg2042_mux_nb(_nb) container_of(_nb, struct sg2042_mux_clock, clk_nb)
+
+#ifdef DEBUG
+	#define dbg_info(format, arg...) \
+		pr_info("--> %s: "format"", __func__, ## arg)
+#else
+	#define dbg_info(format, arg...)
+#endif
+
+#endif /* __CLK_SOPHGO_SG2042_H */
-- 
2.25.1

Re: [PATCH v2 3/4] clk: sophgo: Add SG2042 clock generator driver

[Krzysztof Kozlowski]

On 27/11/2023 02:15, Chen Wang wrote:
> From: Chen Wang <unicorn_wang@outlook.com>
> 
> Add a driver for the SOPHGO SG2042 clock generator.
> 
> Signed-off-by: Chen Wang <unicorn_wang@outlook.com>

...

> +static void __init sg2042_clk_init(struct device_node *node)
> +{
> +	struct sg2042_clk_data *clk_data = NULL;
> +	int i, ret = 0;
> +	int num_clks = 0;
> +
> +	num_clks = ARRAY_SIZE(sg2042_pll_clks) +
> +		   ARRAY_SIZE(sg2042_div_clks) +
> +		   ARRAY_SIZE(sg2042_gate_clks) +
> +		   ARRAY_SIZE(sg2042_mux_clks);
> +	if (num_clks == 0) {
> +		ret = -EINVAL;
> +		goto error_out;
> +	}
> +
> +	ret = sg2042_clk_init_clk_data(node, num_clks, &clk_data);
> +	if (ret < 0)
> +		goto error_out;
> +
> +	ret = sg2042_clk_register_plls(clk_data, sg2042_pll_clks,
> +				ARRAY_SIZE(sg2042_pll_clks));
> +	if (ret)
> +		goto cleanup;
> +
> +	ret = sg2042_clk_register_divs(clk_data, sg2042_div_clks,
> +				ARRAY_SIZE(sg2042_div_clks));
> +	if (ret)
> +		goto cleanup;
> +
> +	ret = sg2042_clk_register_gates(clk_data, sg2042_gate_clks,
> +				ARRAY_SIZE(sg2042_gate_clks));
> +	if (ret)
> +		goto cleanup;
> +
> +	ret = sg2042_clk_register_muxs(clk_data, sg2042_mux_clks,
> +				ARRAY_SIZE(sg2042_mux_clks));
> +	if (ret)
> +		goto cleanup;
> +
> +	for (i = 0; i < num_clks; i++)
> +		dbg_info("provider [%d]: %s\n", i, clk_hw_get_name(clk_data->onecell_data.hws[i]));
> +	ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, &clk_data->onecell_data);
> +	if (ret)
> +		goto cleanup;
> +
> +	return;
> +
> +cleanup:
> +	for (i = 0; i < num_clks; i++) {
> +		if (clk_data->onecell_data.hws[i] != NULL)
> +			clk_hw_unregister(clk_data->onecell_data.hws[i]);
> +	}
> +	kfree(clk_data);
> +
> +error_out:
> +	pr_err("%s failed error number %d\n", __func__, ret);
> +}
> +
> +CLK_OF_DECLARE(sg2042_clk, "sophgo,sg2042-clkgen", sg2042_clk_init);

No, this should be platform device. It's a child of another device, so
you cannot use other way of init ordering.

> diff --git a/drivers/clk/sophgo/clk-sophgo-sg2042.h b/drivers/clk/sophgo/clk-sophgo-sg2042.h
> new file mode 100644
> index 000000000000..ca1c8b9a937a
> --- /dev/null


...

> +#define to_sg2042_mux_nb(_nb) container_of(_nb, struct sg2042_mux_clock, clk_nb)
> +
> +#ifdef DEBUG
> +	#define dbg_info(format, arg...) \
> +		pr_info("--> %s: "format"", __func__, ## arg)
> +#else
> +	#define dbg_info(format, arg...)
> +#endif

Drop custom debug prints.

> +
> +#endif /* __CLK_SOPHGO_SG2042_H */

Best regards,
Krzysztof

Re: [PATCH v2 3/4] clk: sophgo: Add SG2042 clock generator driver

[Chen Wang]

On 2023/11/27 15:12, Krzysztof Kozlowski wrote:
> On 27/11/2023 02:15, Chen Wang wrote:
>> From: Chen Wang <unicorn_wang@outlook.com>
>>
>> Add a driver for the SOPHGO SG2042 clock generator.
>>
>> Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
> ...
>
>> +static void __init sg2042_clk_init(struct device_node *node)
>> +{
>> +	struct sg2042_clk_data *clk_data = NULL;
>> +	int i, ret = 0;
>> +	int num_clks = 0;
>> +
>> +	num_clks = ARRAY_SIZE(sg2042_pll_clks) +
>> +		   ARRAY_SIZE(sg2042_div_clks) +
>> +		   ARRAY_SIZE(sg2042_gate_clks) +
>> +		   ARRAY_SIZE(sg2042_mux_clks);
>> +	if (num_clks == 0) {
>> +		ret = -EINVAL;
>> +		goto error_out;
>> +	}
>> +
>> +	ret = sg2042_clk_init_clk_data(node, num_clks, &clk_data);
>> +	if (ret < 0)
>> +		goto error_out;
>> +
>> +	ret = sg2042_clk_register_plls(clk_data, sg2042_pll_clks,
>> +				ARRAY_SIZE(sg2042_pll_clks));
>> +	if (ret)
>> +		goto cleanup;
>> +
>> +	ret = sg2042_clk_register_divs(clk_data, sg2042_div_clks,
>> +				ARRAY_SIZE(sg2042_div_clks));
>> +	if (ret)
>> +		goto cleanup;
>> +
>> +	ret = sg2042_clk_register_gates(clk_data, sg2042_gate_clks,
>> +				ARRAY_SIZE(sg2042_gate_clks));
>> +	if (ret)
>> +		goto cleanup;
>> +
>> +	ret = sg2042_clk_register_muxs(clk_data, sg2042_mux_clks,
>> +				ARRAY_SIZE(sg2042_mux_clks));
>> +	if (ret)
>> +		goto cleanup;
>> +
>> +	for (i = 0; i < num_clks; i++)
>> +		dbg_info("provider [%d]: %s\n", i, clk_hw_get_name(clk_data->onecell_data.hws[i]));
>> +	ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, &clk_data->onecell_data);
>> +	if (ret)
>> +		goto cleanup;
>> +
>> +	return;
>> +
>> +cleanup:
>> +	for (i = 0; i < num_clks; i++) {
>> +		if (clk_data->onecell_data.hws[i] != NULL)
>> +			clk_hw_unregister(clk_data->onecell_data.hws[i]);
>> +	}
>> +	kfree(clk_data);
>> +
>> +error_out:
>> +	pr_err("%s failed error number %d\n", __func__, ret);
>> +}
>> +
>> +CLK_OF_DECLARE(sg2042_clk, "sophgo,sg2042-clkgen", sg2042_clk_init);
> No, this should be platform device. It's a child of another device, so
> you cannot use other way of init ordering.

hi, Krzysztof,

Thanks for your review.

I don't quite understand your opinion. Do you mean CLK_OF_DECLARE is 
only used for platform device so it can not be use here? But I think 
this driver is still for platform device though I move the clock 
controller node as a child of the system contoller node. System 
controller node is just a block of registers which are used to control 
some other platform devices ,such as clock controller, reset controller 
and pin controller for this SoC.

And I also see other similar code in kernel, for example: 
drivers/clk/clk-k210.c.

And I'm confused by your input "so you cannot use other way of init 
ordering." Do you mean "so you CAN use other way of init ordering"? 
What's the other way of init ordering do you mean?

Thanks,

Chen

Re: [PATCH v2 3/4] clk: sophgo: Add SG2042 clock generator driver

[Krzysztof Kozlowski]

On 27/11/2023 09:07, Chen Wang wrote:
> 
> On 2023/11/27 15:12, Krzysztof Kozlowski wrote:
>> On 27/11/2023 02:15, Chen Wang wrote:
>>> From: Chen Wang <unicorn_wang@outlook.com>
>>>
>>> Add a driver for the SOPHGO SG2042 clock generator.
>>>
>>> Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
>> ...
>>
>>> +static void __init sg2042_clk_init(struct device_node *node)
>>> +{
>>> +	struct sg2042_clk_data *clk_data = NULL;
>>> +	int i, ret = 0;
>>> +	int num_clks = 0;
>>> +
>>> +	num_clks = ARRAY_SIZE(sg2042_pll_clks) +
>>> +		   ARRAY_SIZE(sg2042_div_clks) +
>>> +		   ARRAY_SIZE(sg2042_gate_clks) +
>>> +		   ARRAY_SIZE(sg2042_mux_clks);
>>> +	if (num_clks == 0) {
>>> +		ret = -EINVAL;
>>> +		goto error_out;
>>> +	}
>>> +
>>> +	ret = sg2042_clk_init_clk_data(node, num_clks, &clk_data);
>>> +	if (ret < 0)
>>> +		goto error_out;
>>> +
>>> +	ret = sg2042_clk_register_plls(clk_data, sg2042_pll_clks,
>>> +				ARRAY_SIZE(sg2042_pll_clks));
>>> +	if (ret)
>>> +		goto cleanup;
>>> +
>>> +	ret = sg2042_clk_register_divs(clk_data, sg2042_div_clks,
>>> +				ARRAY_SIZE(sg2042_div_clks));
>>> +	if (ret)
>>> +		goto cleanup;
>>> +
>>> +	ret = sg2042_clk_register_gates(clk_data, sg2042_gate_clks,
>>> +				ARRAY_SIZE(sg2042_gate_clks));
>>> +	if (ret)
>>> +		goto cleanup;
>>> +
>>> +	ret = sg2042_clk_register_muxs(clk_data, sg2042_mux_clks,
>>> +				ARRAY_SIZE(sg2042_mux_clks));
>>> +	if (ret)
>>> +		goto cleanup;
>>> +
>>> +	for (i = 0; i < num_clks; i++)
>>> +		dbg_info("provider [%d]: %s\n", i, clk_hw_get_name(clk_data->onecell_data.hws[i]));
>>> +	ret = of_clk_add_hw_provider(node, of_clk_hw_onecell_get, &clk_data->onecell_data);
>>> +	if (ret)
>>> +		goto cleanup;
>>> +
>>> +	return;
>>> +
>>> +cleanup:
>>> +	for (i = 0; i < num_clks; i++) {
>>> +		if (clk_data->onecell_data.hws[i] != NULL)
>>> +			clk_hw_unregister(clk_data->onecell_data.hws[i]);
>>> +	}
>>> +	kfree(clk_data);
>>> +
>>> +error_out:
>>> +	pr_err("%s failed error number %d\n", __func__, ret);
>>> +}
>>> +
>>> +CLK_OF_DECLARE(sg2042_clk, "sophgo,sg2042-clkgen", sg2042_clk_init);
>> No, this should be platform device. It's a child of another device, so
>> you cannot use other way of init ordering.
> 
> hi, Krzysztof,
> 
> Thanks for your review.
> 
> I don't quite understand your opinion. Do you mean CLK_OF_DECLARE is 
> only used for platform device so it can not be use here? But I think 

No, I meant you mix init ordering: you depend now on syscon earlier
initcall than CLK_OF_DECLARE. Do you remember which one is first? If
anything changes here, your driver is broken. There is no dependency, no
probe deferral.

> this driver is still for platform device though I move the clock 
> controller node as a child of the system contoller node. System 
> controller node is just a block of registers which are used to control 
> some other platform devices ,such as clock controller, reset controller 
> and pin controller for this SoC.
> 
> And I also see other similar code in kernel, for example: 
> drivers/clk/clk-k210.c.
> 
> And I'm confused by your input "so you cannot use other way of init 
> ordering." Do you mean "so you CAN use other way of init ordering"? 

No, I meant you cannot. If you want to use syscon, then your driver
should be a proper driver. Therefore add a driver.

> What's the other way of init ordering do you mean?

The one coming not from initcalls but driver model.

Best regards,
Krzysztof

Re: [PATCH v2 3/4] clk: sophgo: Add SG2042 clock generator driver

[Chen Wang]

On 2023/11/27 17:16, Krzysztof Kozlowski wrote:
> On 27/11/2023 09:07, Chen Wang wrote:
>> On 2023/11/27 15:12, Krzysztof Kozlowski wrote:
>>> On 27/11/2023 02:15, Chen Wang wrote:
>>>> From: Chen Wang <unicorn_wang@outlook.com>
>>>>
>>>> Add a driver for the SOPHGO SG2042 clock generator.
>>>>
>>>> Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
>>> ...
>>>
>>> +}
>>> +
>>> +CLK_OF_DECLARE(sg2042_clk, "sophgo,sg2042-clkgen", sg2042_clk_init);
>>> No, this should be platform device. It's a child of another device, so
>>> you cannot use other way of init ordering.
>> hi, Krzysztof,
>>
>> Thanks for your review.
>>
>> I don't quite understand your opinion. Do you mean CLK_OF_DECLARE is
>> only used for platform device so it can not be use here? But I think
> No, I meant you mix init ordering: you depend now on syscon earlier
> initcall than CLK_OF_DECLARE. Do you remember which one is first? If
> anything changes here, your driver is broken. There is no dependency, no
> probe deferral.

hi, Krzysztof,

I found that the initcall method cannot be used for the clock controller 
of sg2042. We need to initialize the clock earlier because there are two 
dw-apb-timers in sg2042 (Sorry, I have not added them in the current DTS 
of sg2042, will be submitted later). The initialization of these timers 
(timer_probe()) depends on the initialization of the clock controller. 
If we use the initcall mechanism, it will be too late for the timer. So 
it seems better to use CLK_OF_DECLARE provided by CCF.

I have a question here that I would like to discuss. The design of 
sg2042 is like this, according to the design of memorymap in its TRM:

070:3001:0000 ~ 070:3001:0FFF SYS_CTRL 4K
070:3001:1000 ~ 070:3001:1FFF PINMUX 4K
070:3001:2000 ~ 070:3001:2FFF CLOCK 4K
070:3001:3000 ~ 070:3001:3FFF RESET 4K

But also as per hw design (I don't know why and I don't like it also :( 
), some of the PLL/GATE CLOCK control registers are defined in the scope 
of SYS_CTRL, and others are defined in the scope of CLOCK. That's why in 
the current code, I define the syscon node corresponding to SYS_CTRL. 
The purpose is just to get the regmap of syscon for the clock controller 
through the device tree (through device_node_to_regmap()), so that the 
syscon defined in SYS_CTRL can be accessed through the regmap from 
clock. The clock controller driver itself does not rely on other 
operations of syscon.

So based on the above analysis, is it still necessary for us to define 
the clock controller as a child node of syscon? In the version v1 of 
this patch, I actually did not define the clock controller as a child 
node of syscon, but only accessed syscon through the phandle method. [1]

After more read of the TRM, I believe this situation only exists for 
clock. That is to say, there will be only one child node of clook under 
syscon. From a hardware design perspective, CLOCK and SYS_CTRL are two 
different blocks. So I think it is better to restore the original 
method, that is, restore clock and syscon to nodes of the same level, 
and let clock use phandle to access syscon.

What do you think or do you have any good suggestions?

Link: 
https://lore.kernel.org/linux-riscv/20231114-timid-habitat-a06e52e59c9c@squawk/#t 
[1]

Thanks

Chen

>
>> this driver is still for platform device though I move the clock
>> controller node as a child of the system contoller node. System
>> controller node is just a block of registers which are used to control
>> some other platform devices ,such as clock controller, reset controller
>> and pin controller for this SoC.
>>
>> And I also see other similar code in kernel, for example:
>> drivers/clk/clk-k210.c.
>>
>> And I'm confused by your input "so you cannot use other way of init
>> ordering." Do you mean "so you CAN use other way of init ordering"?
> No, I meant you cannot. If you want to use syscon, then your driver
> should be a proper driver. Therefore add a driver.
>
>> What's the other way of init ordering do you mean?
> The one coming not from initcalls but driver model.
>
> Best regards,
> Krzysztof
>

Re: [PATCH v2 3/4] clk: sophgo: Add SG2042 clock generator driver

[Krzysztof Kozlowski]

On 30/11/2023 07:37, Chen Wang wrote:
> 
> On 2023/11/27 17:16, Krzysztof Kozlowski wrote:
>> On 27/11/2023 09:07, Chen Wang wrote:
>>> On 2023/11/27 15:12, Krzysztof Kozlowski wrote:
>>>> On 27/11/2023 02:15, Chen Wang wrote:
>>>>> From: Chen Wang <unicorn_wang@outlook.com>
>>>>>
>>>>> Add a driver for the SOPHGO SG2042 clock generator.
>>>>>
>>>>> Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
>>>> ...
>>>>
>>>> +}
>>>> +
>>>> +CLK_OF_DECLARE(sg2042_clk, "sophgo,sg2042-clkgen", sg2042_clk_init);
>>>> No, this should be platform device. It's a child of another device, so
>>>> you cannot use other way of init ordering.
>>> hi, Krzysztof,
>>>
>>> Thanks for your review.
>>>
>>> I don't quite understand your opinion. Do you mean CLK_OF_DECLARE is
>>> only used for platform device so it can not be use here? But I think
>> No, I meant you mix init ordering: you depend now on syscon earlier
>> initcall than CLK_OF_DECLARE. Do you remember which one is first? If
>> anything changes here, your driver is broken. There is no dependency, no
>> probe deferral.
> 
> hi, Krzysztof,
> 
> I found that the initcall method cannot be used for the clock controller 
> of sg2042. We need to initialize the clock earlier because there are two 
> dw-apb-timers in sg2042 (Sorry, I have not added them in the current DTS 
> of sg2042, will be submitted later). The initialization of these timers 
> (timer_probe()) depends on the initialization of the clock controller. 
> If we use the initcall mechanism, it will be too late for the timer. So 
> it seems better to use CLK_OF_DECLARE provided by CCF.

Sure, that's fine, but don't use syscon in such case.

> 
> I have a question here that I would like to discuss. The design of 
> sg2042 is like this, according to the design of memorymap in its TRM:
> 
> 070:3001:0000 ~ 070:3001:0FFF SYS_CTRL 4K
> 070:3001:1000 ~ 070:3001:1FFF PINMUX 4K
> 070:3001:2000 ~ 070:3001:2FFF CLOCK 4K
> 070:3001:3000 ~ 070:3001:3FFF RESET 4K
> 
> But also as per hw design (I don't know why and I don't like it also :( 
> ), some of the PLL/GATE CLOCK control registers are defined in the scope 
> of SYS_CTRL, and others are defined in the scope of CLOCK. That's why in 
> the current code, I define the syscon node corresponding to SYS_CTRL. 
> The purpose is just to get the regmap of syscon for the clock controller 
> through the device tree (through device_node_to_regmap()), so that the 
> syscon defined in SYS_CTRL can be accessed through the regmap from 
> clock. The clock controller driver itself does not rely on other 
> operations of syscon.
> 
> So based on the above analysis, is it still necessary for us to define 
> the clock controller as a child node of syscon? In the version v1 of 
> this patch, I actually did not define the clock controller as a child 
> node of syscon, but only accessed syscon through the phandle method. [1]

I have impression you ask me if your solution is ok, but I already
pointed the problem. Address the problem - how do you enforce ordering
of syscon and CLK_OF_DECLARE? What initcalls are both?

> 
> After more read of the TRM, I believe this situation only exists for 
> clock. That is to say, there will be only one child node of clook under 
> syscon. From a hardware design perspective, CLOCK and SYS_CTRL are two 
> different blocks. So I think it is better to restore the original 
> method, that is, restore clock and syscon to nodes of the same level, 
> and let clock use phandle to access syscon.
> 
> What do you think or do you have any good suggestions?


Best regards,
Krzysztof

Re: [PATCH v2 3/4] clk: sophgo: Add SG2042 clock generator driver

[Chen Wang]

On 2023/11/30 16:01, Krzysztof Kozlowski wrote:
> On 30/11/2023 07:37, Chen Wang wrote:
>> On 2023/11/27 17:16, Krzysztof Kozlowski wrote:
>>> On 27/11/2023 09:07, Chen Wang wrote:
>>>> On 2023/11/27 15:12, Krzysztof Kozlowski wrote:
>>>>> On 27/11/2023 02:15, Chen Wang wrote:
>>>>>> From: Chen Wang <unicorn_wang@outlook.com>
>>>>>>
>>>>>> Add a driver for the SOPHGO SG2042 clock generator.
>>>>>>
>>>>>> Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
>>>>> ...
>>>>>
>>>>> +}
>>>>> +
>>>>> +CLK_OF_DECLARE(sg2042_clk, "sophgo,sg2042-clkgen", sg2042_clk_init);
>>>>> No, this should be platform device. It's a child of another device, so
>>>>> you cannot use other way of init ordering.
>>>> hi, Krzysztof,
>>>>
>>>> Thanks for your review.
>>>>
>>>> I don't quite understand your opinion. Do you mean CLK_OF_DECLARE is
>>>> only used for platform device so it can not be use here? But I think
>>> No, I meant you mix init ordering: you depend now on syscon earlier
>>> initcall than CLK_OF_DECLARE. Do you remember which one is first? If
>>> anything changes here, your driver is broken. There is no dependency, no
>>> probe deferral.
>> hi, Krzysztof,
>>
>> I found that the initcall method cannot be used for the clock controller
>> of sg2042. We need to initialize the clock earlier because there are two
>> dw-apb-timers in sg2042 (Sorry, I have not added them in the current DTS
>> of sg2042, will be submitted later). The initialization of these timers
>> (timer_probe()) depends on the initialization of the clock controller.
>> If we use the initcall mechanism, it will be too late for the timer. So
>> it seems better to use CLK_OF_DECLARE provided by CCF.
> Sure, that's fine, but don't use syscon in such case.
Yes, syscon is inappropriate. As per suggestion from Conor in anther 
email, I will define a sg2042 specific sysctl to handle this.
>
>> I have a question here that I would like to discuss. The design of
>> sg2042 is like this, according to the design of memorymap in its TRM:
>>
>> 070:3001:0000 ~ 070:3001:0FFF SYS_CTRL 4K
>> 070:3001:1000 ~ 070:3001:1FFF PINMUX 4K
>> 070:3001:2000 ~ 070:3001:2FFF CLOCK 4K
>> 070:3001:3000 ~ 070:3001:3FFF RESET 4K
>>
>> But also as per hw design (I don't know why and I don't like it also :(
>> ), some of the PLL/GATE CLOCK control registers are defined in the scope
>> of SYS_CTRL, and others are defined in the scope of CLOCK. That's why in
>> the current code, I define the syscon node corresponding to SYS_CTRL.
>> The purpose is just to get the regmap of syscon for the clock controller
>> through the device tree (through device_node_to_regmap()), so that the
>> syscon defined in SYS_CTRL can be accessed through the regmap from
>> clock. The clock controller driver itself does not rely on other
>> operations of syscon.
>>
>> So based on the above analysis, is it still necessary for us to define
>> the clock controller as a child node of syscon? In the version v1 of
>> this patch, I actually did not define the clock controller as a child
>> node of syscon, but only accessed syscon through the phandle method. [1]
> I have impression you ask me if your solution is ok, but I already
> pointed the problem. Address the problem - how do you enforce ordering
> of syscon and CLK_OF_DECLARE? What initcalls are both?
>
>> After more read of the TRM, I believe this situation only exists for
>> clock. That is to say, there will be only one child node of clook under
>> syscon. From a hardware design perspective, CLOCK and SYS_CTRL are two
>> different blocks. So I think it is better to restore the original
>> method, that is, restore clock and syscon to nodes of the same level,
>> and let clock use phandle to access syscon.
>>
>> What do you think or do you have any good suggestions?
>
> Best regards,
> Krzysztof
>

Re: [PATCH v2 3/4] clk: sophgo: Add SG2042 clock generator driver

[Conor Dooley]

[-- Attachment #1: Type: text/plain, Size: 5558 bytes --]

On Thu, Nov 30, 2023 at 02:37:53PM +0800, Chen Wang wrote:
> 
> On 2023/11/27 17:16, Krzysztof Kozlowski wrote:
> > On 27/11/2023 09:07, Chen Wang wrote:
> > > On 2023/11/27 15:12, Krzysztof Kozlowski wrote:
> > > > On 27/11/2023 02:15, Chen Wang wrote:
> > > > > From: Chen Wang <unicorn_wang@outlook.com>
> > > > > 
> > > > > Add a driver for the SOPHGO SG2042 clock generator.
> > > > > 
> > > > > Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
> > > > ...
> > > > 
> > > > +}
> > > > +
> > > > +CLK_OF_DECLARE(sg2042_clk, "sophgo,sg2042-clkgen", sg2042_clk_init);
> > > > No, this should be platform device. It's a child of another device, so
> > > > you cannot use other way of init ordering.
> > > hi, Krzysztof,
> > > 
> > > Thanks for your review.
> > > 
> > > I don't quite understand your opinion. Do you mean CLK_OF_DECLARE is
> > > only used for platform device so it can not be use here? But I think
> > No, I meant you mix init ordering: you depend now on syscon earlier
> > initcall than CLK_OF_DECLARE. Do you remember which one is first? If
> > anything changes here, your driver is broken. There is no dependency, no
> > probe deferral.
> 
> hi, Krzysztof,
> 
> I found that the initcall method cannot be used for the clock controller of
> sg2042. We need to initialize the clock earlier because there are two
> dw-apb-timers in sg2042 (Sorry, I have not added them in the current DTS of
> sg2042, will be submitted later). The initialization of these timers
> (timer_probe()) depends on the initialization of the clock controller. If we
> use the initcall mechanism, it will be too late for the timer. So it seems
> better to use CLK_OF_DECLARE provided by CCF.
> 
> I have a question here that I would like to discuss. The design of sg2042 is
> like this, according to the design of memorymap in its TRM:
> 
> 070:3001:0000 ~ 070:3001:0FFF SYS_CTRL 4K
> 070:3001:1000 ~ 070:3001:1FFF PINMUX 4K
> 070:3001:2000 ~ 070:3001:2FFF CLOCK 4K
> 070:3001:3000 ~ 070:3001:3FFF RESET 4K
> 
> But also as per hw design (I don't know why and I don't like it also :( ),
> some of the PLL/GATE CLOCK control registers are defined in the scope of
> SYS_CTRL, and others are defined in the scope of CLOCK. That's why in the
> current code, I define the syscon node corresponding to SYS_CTRL. The
> purpose is just to get the regmap of syscon for the clock controller through
> the device tree (through device_node_to_regmap()), so that the syscon
> defined in SYS_CTRL can be accessed through the regmap from clock. The clock
> controller driver itself does not rely on other operations of syscon.
> 
> So based on the above analysis, is it still necessary for us to define the
> clock controller as a child node of syscon? In the version v1 of this patch,
> I actually did not define the clock controller as a child node of syscon,
> but only accessed syscon through the phandle method. [1]

In that version of the code, clkgen, your DTS, looked like:
+	clkgen: clock-controller {
+		compatible = "sophgo,sg2042-clkgen";
+		#clock-cells = <1>;
+		system-ctrl = <&sys_ctrl>;
+		clocks = <&cgi>;
+		assigned-clocks = \

+		assigned-clock-rates = \

+	};

It had no register regions of its own, just what it got from the sys
ctrl block, which is why I said that. The syscon block looked like:

+		sys_ctrl: syscon@7030010000 {
+			compatible = "sophgo,sg2042-syscon", "syscon";
+			reg = <0x70 0x30010000 0x0 0x8000>;
+		};

which given the register map does not seem like an accurate reflection
of the size of this region. The "0x8000" should be "0x1000".
> 
> After more read of the TRM, I believe this situation only exists for clock.
> That is to say, there will be only one child node of clook under syscon.
> From a hardware design perspective, CLOCK and SYS_CTRL are two different
> blocks. So I think it is better to restore the original method, that is,
> restore clock and syscon to nodes of the same level, and let clock use
> phandle to access syscon.

This sounds two me like there are two different devices. One the "CLOCK"
region at 070:3001:2000 that should be documented as being
"sophgo,sg2042-clkgen" or similar and the second being the "SYS_CTRL" at
070:3001:0000 that is called something like "sophgo,sg2042-sysctrl".
Having more than one clock controller is not a problem and sounds like a
more accurate description of the hardware.

> 
> What do you think or do you have any good suggestions?
> 
> Link: https://lore.kernel.org/linux-riscv/20231114-timid-habitat-a06e52e59c9c@squawk/#t
> [1]
> 
> Thanks
> 
> Chen
> 
> > 
> > > this driver is still for platform device though I move the clock
> > > controller node as a child of the system contoller node. System
> > > controller node is just a block of registers which are used to control
> > > some other platform devices ,such as clock controller, reset controller
> > > and pin controller for this SoC.
> > > 
> > > And I also see other similar code in kernel, for example:
> > > drivers/clk/clk-k210.c.
> > > 
> > > And I'm confused by your input "so you cannot use other way of init
> > > ordering." Do you mean "so you CAN use other way of init ordering"?
> > No, I meant you cannot. If you want to use syscon, then your driver
> > should be a proper driver. Therefore add a driver.
> > 
> > > What's the other way of init ordering do you mean?
> > The one coming not from initcalls but driver model.
> > 
> > Best regards,
> > Krzysztof
> > 

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Re: [PATCH v2 3/4] clk: sophgo: Add SG2042 clock generator driver

[Chen Wang]

On 2023/11/30 16:12, Conor Dooley wrote:
> On Thu, Nov 30, 2023 at 02:37:53PM +0800, Chen Wang wrote:
>> On 2023/11/27 17:16, Krzysztof Kozlowski wrote:
>>> On 27/11/2023 09:07, Chen Wang wrote:
>>>> On 2023/11/27 15:12, Krzysztof Kozlowski wrote:
>>>>> On 27/11/2023 02:15, Chen Wang wrote:
>>>>>> From: Chen Wang <unicorn_wang@outlook.com>
>>>>>>
>>>>>> Add a driver for the SOPHGO SG2042 clock generator.
>>>>>>
>>>>>> Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
>>>>> ...
>>>>>
>>>>> +}
>>>>> +
>>>>> +CLK_OF_DECLARE(sg2042_clk, "sophgo,sg2042-clkgen", sg2042_clk_init);
>>>>> No, this should be platform device. It's a child of another device, so
>>>>> you cannot use other way of init ordering.
>>>> hi, Krzysztof,
>>>>
>>>> Thanks for your review.
>>>>
>>>> I don't quite understand your opinion. Do you mean CLK_OF_DECLARE is
>>>> only used for platform device so it can not be use here? But I think
>>> No, I meant you mix init ordering: you depend now on syscon earlier
>>> initcall than CLK_OF_DECLARE. Do you remember which one is first? If
>>> anything changes here, your driver is broken. There is no dependency, no
>>> probe deferral.
>> hi, Krzysztof,
>>
>> I found that the initcall method cannot be used for the clock controller of
>> sg2042. We need to initialize the clock earlier because there are two
>> dw-apb-timers in sg2042 (Sorry, I have not added them in the current DTS of
>> sg2042, will be submitted later). The initialization of these timers
>> (timer_probe()) depends on the initialization of the clock controller. If we
>> use the initcall mechanism, it will be too late for the timer. So it seems
>> better to use CLK_OF_DECLARE provided by CCF.
>>
>> I have a question here that I would like to discuss. The design of sg2042 is
>> like this, according to the design of memorymap in its TRM:
>>
>> 070:3001:0000 ~ 070:3001:0FFF SYS_CTRL 4K
>> 070:3001:1000 ~ 070:3001:1FFF PINMUX 4K
>> 070:3001:2000 ~ 070:3001:2FFF CLOCK 4K
>> 070:3001:3000 ~ 070:3001:3FFF RESET 4K
>>
>> But also as per hw design (I don't know why and I don't like it also :( ),
>> some of the PLL/GATE CLOCK control registers are defined in the scope of
>> SYS_CTRL, and others are defined in the scope of CLOCK. That's why in the
>> current code, I define the syscon node corresponding to SYS_CTRL. The
>> purpose is just to get the regmap of syscon for the clock controller through
>> the device tree (through device_node_to_regmap()), so that the syscon
>> defined in SYS_CTRL can be accessed through the regmap from clock. The clock
>> controller driver itself does not rely on other operations of syscon.
>>
>> So based on the above analysis, is it still necessary for us to define the
>> clock controller as a child node of syscon? In the version v1 of this patch,
>> I actually did not define the clock controller as a child node of syscon,
>> but only accessed syscon through the phandle method. [1]
> In that version of the code, clkgen, your DTS, looked like:
> +	clkgen: clock-controller {
> +		compatible = "sophgo,sg2042-clkgen";
> +		#clock-cells = <1>;
> +		system-ctrl = <&sys_ctrl>;
> +		clocks = <&cgi>;
> +		assigned-clocks = \
>
> +		assigned-clock-rates = \
>
> +	};
>
> It had no register regions of its own, just what it got from the sys
> ctrl block, which is why I said that. The syscon block looked like:
>
> +		sys_ctrl: syscon@7030010000 {
> +			compatible = "sophgo,sg2042-syscon", "syscon";
> +			reg = <0x70 0x30010000 0x0 0x8000>;
> +		};
>
> which given the register map does not seem like an accurate reflection
> of the size of this region. The "0x8000" should be "0x1000".

Thanks for your carefully checking.

The history is when I was working on v1, the description in TRM was:

070:3001:0000 ~ 070:3001:7FFF SYS_CTRL 32K

Now the TRM is updated and the SYS_CTRL is divided into 4 parts.

>> After more read of the TRM, I believe this situation only exists for clock.
>> That is to say, there will be only one child node of clook under syscon.
>>  From a hardware design perspective, CLOCK and SYS_CTRL are two different
>> blocks. So I think it is better to restore the original method, that is,
>> restore clock and syscon to nodes of the same level, and let clock use
>> phandle to access syscon.
> This sounds two me like there are two different devices. One the "CLOCK"
> region at 070:3001:2000 that should be documented as being
> "sophgo,sg2042-clkgen" or similar and the second being the "SYS_CTRL" at
> 070:3001:0000 that is called something like "sophgo,sg2042-sysctrl".
> Having more than one clock controller is not a problem and sounds like a
> more accurate description of the hardware.

Yes, I agree a new "sg2042-sysctrl" is better and "syscon" should not be 
used as per input from Krzysztof.

Actually in the TRM, the "SYS_CTRL" is described as a block composed of 
many registers for different misc functions, and controlling of clocks 
are just part of it. The hw designer scatter clock registers into 
differnet area of registers and make people confused.

>
>> What do you think or do you have any good suggestions?
>>
>> Link: https://lore.kernel.org/linux-riscv/20231114-timid-habitat-a06e52e59c9c@squawk/#t
>> [1]
>>
>> Thanks
>>
>> Chen
>>
>>>> this driver is still for platform device though I move the clock
>>>> controller node as a child of the system contoller node. System
>>>> controller node is just a block of registers which are used to control
>>>> some other platform devices ,such as clock controller, reset controller
>>>> and pin controller for this SoC.
>>>>
>>>> And I also see other similar code in kernel, for example:
>>>> drivers/clk/clk-k210.c.
>>>>
>>>> And I'm confused by your input "so you cannot use other way of init
>>>> ordering." Do you mean "so you CAN use other way of init ordering"?
>>> No, I meant you cannot. If you want to use syscon, then your driver
>>> should be a proper driver. Therefore add a driver.
>>>
>>>> What's the other way of init ordering do you mean?
>>> The one coming not from initcalls but driver model.
>>>
>>> Best regards,
>>> Krzysztof
>>>

[PATCH v2 4/4] riscv: dts: add clock generator for Sophgo SG2042 SoC

[Chen Wang]

From: Chen Wang <unicorn_wang@outlook.com>

Add clock generator node to device tree for SG2042, and enable clock for
uart.

Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
---
 .../boot/dts/sophgo/sg2042-milkv-pioneer.dts  |  4 +
 arch/riscv/boot/dts/sophgo/sg2042.dtsi        | 77 +++++++++++++++++++
 2 files changed, 81 insertions(+)

diff --git a/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts b/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
index 49b4b9c2c101..0b3b3b2b0c64 100644
--- a/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
+++ b/arch/riscv/boot/dts/sophgo/sg2042-milkv-pioneer.dts
@@ -14,6 +14,10 @@ chosen {
 	};
 };
 
+&cgi {
+	clock-frequency = <25000000>;
+};
+
 &uart0 {
 	status = "okay";
 };
diff --git a/arch/riscv/boot/dts/sophgo/sg2042.dtsi b/arch/riscv/boot/dts/sophgo/sg2042.dtsi
index 93256540d078..c5849a0e74d0 100644
--- a/arch/riscv/boot/dts/sophgo/sg2042.dtsi
+++ b/arch/riscv/boot/dts/sophgo/sg2042.dtsi
@@ -5,6 +5,7 @@
 
 /dts-v1/;
 #include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/clock/sophgo-sg2042-clk.h>
 
 #include "sg2042-cpus.dtsi"
 
@@ -18,6 +19,12 @@ aliases {
 		serial0 = &uart0;
 	};
 
+	cgi: oscillator {
+		compatible = "fixed-clock";
+		clock-output-names = "cgi";
+		#clock-cells = <0>;
+	};
+
 	soc: soc {
 		compatible = "simple-bus";
 		#address-cells = <2>;
@@ -311,12 +318,82 @@ intc: interrupt-controller@7090000000 {
 			riscv,ndev = <224>;
 		};
 
+		sys_ctrl: syscon@7030010000 {
+			compatible = "sophgo,sg2042-syscon", "syscon";
+			reg = <0x70 0x30010000 0x0 0x8000>;
+
+			clkgen: clock-controller {
+				compatible = "sophgo,sg2042-clkgen";
+				#clock-cells = <1>;
+				clocks = <&cgi>;
+				assigned-clocks = \
+					<&clkgen DIV_CLK_FPLL_RP_CPU_NORMAL_1>,
+					<&clkgen DIV_CLK_FPLL_50M_A53>,
+					<&clkgen DIV_CLK_FPLL_TOP_RP_CMN_DIV2>,
+					<&clkgen DIV_CLK_FPLL_UART_500M>,
+					<&clkgen DIV_CLK_FPLL_AHB_LPC>,
+					<&clkgen DIV_CLK_FPLL_EFUSE>,
+					<&clkgen DIV_CLK_FPLL_TX_ETH0>,
+					<&clkgen DIV_CLK_FPLL_PTP_REF_I_ETH0>,
+					<&clkgen DIV_CLK_FPLL_REF_ETH0>,
+					<&clkgen DIV_CLK_FPLL_EMMC>,
+					<&clkgen DIV_CLK_FPLL_SD>,
+					<&clkgen DIV_CLK_FPLL_TOP_AXI0>,
+					<&clkgen DIV_CLK_FPLL_TOP_AXI_HSPERI>,
+					<&clkgen DIV_CLK_FPLL_AXI_DDR_1>,
+					<&clkgen DIV_CLK_FPLL_DIV_TIMER1>,
+					<&clkgen DIV_CLK_FPLL_DIV_TIMER2>,
+					<&clkgen DIV_CLK_FPLL_DIV_TIMER3>,
+					<&clkgen DIV_CLK_FPLL_DIV_TIMER4>,
+					<&clkgen DIV_CLK_FPLL_DIV_TIMER5>,
+					<&clkgen DIV_CLK_FPLL_DIV_TIMER6>,
+					<&clkgen DIV_CLK_FPLL_DIV_TIMER7>,
+					<&clkgen DIV_CLK_FPLL_DIV_TIMER8>,
+					<&clkgen DIV_CLK_FPLL_100K_EMMC>,
+					<&clkgen DIV_CLK_FPLL_100K_SD>,
+					<&clkgen DIV_CLK_FPLL_GPIO_DB>,
+					<&clkgen DIV_CLK_MPLL_RP_CPU_NORMAL_0>,
+					<&clkgen DIV_CLK_MPLL_AXI_DDR_0>;
+				assigned-clock-rates = \
+					<2000000000>,
+					<50000000>,
+					<1000000000>,
+					<500000000>,
+					<200000000>,
+					<25000000>,
+					<125000000>,
+					<50000000>,
+					<25000000>,
+					<100000000>,
+					<100000000>,
+					<100000000>,
+					<250000000>,
+					<1000000000>,
+					<50000000>,
+					<50000000>,
+					<50000000>,
+					<50000000>,
+					<50000000>,
+					<50000000>,
+					<50000000>,
+					<50000000>,
+					<100000>,
+					<100000>,
+					<100000>,
+					<2000000000>,
+					<1000000000>;
+			};
+		};
+
 		uart0: serial@7040000000 {
 			compatible = "snps,dw-apb-uart";
 			reg = <0x00000070 0x40000000 0x00000000 0x00001000>;
 			interrupt-parent = <&intc>;
 			interrupts = <112 IRQ_TYPE_LEVEL_HIGH>;
 			clock-frequency = <500000000>;
+			clocks = <&clkgen GATE_CLK_UART_500M>,
+				 <&clkgen GATE_CLK_APB_UART>;
+			clock-names = "baudclk", "apb_pclk";
 			reg-shift = <2>;
 			reg-io-width = <4>;
 			status = "disabled";
-- 
2.25.1