[PATCH 0/8] mips: econet: Add clk/reset and PCIe support

[PATCH 0/8] mips: econet: Add clk/reset and PCIe support

[Caleb James DeLisle]

Add clock/reset and PCIe support to EcoNet EN751221 and related SoCs.
This builds on the Airoha EN7523 clock driver and the Mediatek PCIe driver.

Patch 6 is upstreaming of Ahmed Naseef's work on EcoNet PCIe, which was
developed to support the EN7528, but which works equally on the EN751221.

There is also a workaround in patch 7 to gracefully handle PCI hardware
which does not advertize a bridge window and instead always reads zero.

Caleb James DeLisle (8):
  dt-bindings: clock, reset: Add econet EN751221 bindings
  clk: airoha: Add econet EN751221 clock/reset support to en7523-scu
  dt-bindings: phy: Document PCIe PHY in EcoNet EN751221 and EN7528
  phy: econet: Add PCIe PHY driver for EcoNet EN751221 and EN7528 SoCs.
  dt-bindings: PCI: mediatek: Add support for EcoNet EN7528
  PCI: mediatek: Add support for EcoNet EN7528 SoC
  PCI: Skip bridge window reads when window is not supported
  mips: dts: Add PCIe to EcoNet EN751221

 .../bindings/clock/airoha,en7523-scu.yaml     |  19 +-
 .../mips/econet,en751221-chip-scu.yaml        |  41 +++
 .../bindings/pci/mediatek-pcie.yaml           |   1 +
 .../phy/econet,en751221-pcie-phy.yaml         |  57 +++++
 MAINTAINERS                                   |  10 +
 arch/mips/boot/dts/econet/en751221.dtsi       | 114 +++++++++
 .../econet/en751221_smartfiber_xp8421-b.dts   |  21 ++
 arch/mips/econet/Kconfig                      |   2 +
 drivers/clk/Kconfig                           |   6 +-
 drivers/clk/clk-en7523.c                      | 236 +++++++++++++++++-
 drivers/pci/controller/Kconfig                |   2 +-
 drivers/pci/controller/pcie-mediatek.c        | 107 ++++++++
 drivers/pci/probe.c                           |   6 +
 drivers/phy/Kconfig                           |  12 +
 drivers/phy/Makefile                          |   1 +
 drivers/phy/phy-econet-pcie.c                 | 180 +++++++++++++
 .../dt-bindings/clock/econet,en751221-scu.h   |  15 ++
 .../dt-bindings/reset/econet,en751221-scu.h   |  49 ++++
 18 files changed, 869 insertions(+), 10 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml
 create mode 100644 Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml
 create mode 100644 drivers/phy/phy-econet-pcie.c
 create mode 100644 include/dt-bindings/clock/econet,en751221-scu.h
 create mode 100644 include/dt-bindings/reset/econet,en751221-scu.h


base-commit: 3fa5e5702a82d259897bd7e209469bc06368bf31
-- 
2.39.5


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[PATCH 1/8] dt-bindings: clock, reset: Add econet EN751221 bindings

[Caleb James DeLisle]

Add clock and reset bindings for EN751221 as well as
a "chip-scu" which is an additional regmap that is used
by the clock driver as well as others. This split of the
SCU across two register areas is the same as the Airoha
AN758x family.

Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
---
 .../bindings/clock/airoha,en7523-scu.yaml     | 19 ++++++-
 .../mips/econet,en751221-chip-scu.yaml        | 41 ++++++++++++++++
 MAINTAINERS                                   |  3 ++
 .../dt-bindings/clock/econet,en751221-scu.h   | 15 ++++++
 .../dt-bindings/reset/econet,en751221-scu.h   | 49 +++++++++++++++++++
 5 files changed, 126 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml
 create mode 100644 include/dt-bindings/clock/econet,en751221-scu.h
 create mode 100644 include/dt-bindings/reset/econet,en751221-scu.h

diff --git a/Documentation/devicetree/bindings/clock/airoha,en7523-scu.yaml b/Documentation/devicetree/bindings/clock/airoha,en7523-scu.yaml
index a8471367175b..e60e54273393 100644
--- a/Documentation/devicetree/bindings/clock/airoha,en7523-scu.yaml
+++ b/Documentation/devicetree/bindings/clock/airoha,en7523-scu.yaml
@@ -32,6 +32,7 @@ properties:
       - enum:
           - airoha,en7523-scu
           - airoha,en7581-scu
+          - econet,en751221-scu
 
   reg:
     items:
@@ -67,7 +68,10 @@ allOf:
   - if:
       properties:
         compatible:
-          const: airoha,en7581-scu
+          items:
+            - enum:
+                - airoha,en7581-scu
+                - econet,en751221-scu
     then:
       properties:
         reg:
@@ -98,3 +102,16 @@ examples:
               #reset-cells = <1>;
       };
     };
+
+  - |
+    soc {
+      #address-cells = <1>;
+      #size-cells = <1>;
+
+      scuclk2: clock-controller@1fb00000 {
+        compatible = "econet,en751221-scu";
+        reg = <0x1fb00000 0x970>;
+        #clock-cells = <1>;
+        #reset-cells = <1>;
+      };
+    };
diff --git a/Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml b/Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml
new file mode 100644
index 000000000000..7c7c8cf8d2a5
--- /dev/null
+++ b/Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mips/econet,en751221-chip-scu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: EcoNet Chip SCU Controller for EN751221 SoC
+
+maintainers:
+  - Caleb James DeLisle <cjd@cjdns.fr>
+
+description:
+  The EcoNet chip-scu block provides a configuration interface for clock,
+  io-muxing and other functionalities used by multiple controllers (e.g. clock,
+  pinctrl, ecc) on EN751221 SoC.
+
+properties:
+  compatible:
+    items:
+      - const: econet,en751221-chip-scu
+      - const: syscon
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+      #address-cells = <1>;
+      #size-cells = <1>;
+      syscon@1fa20000 {
+        compatible = "econet,en751221-chip-scu", "syscon";
+        reg = <0x1fa20000 0x388>;
+      };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 14899f1de77e..56cf73ce91b8 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9113,12 +9113,15 @@ M:	Caleb James DeLisle <cjd@cjdns.fr>
 L:	linux-mips@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/interrupt-controller/econet,en751221-intc.yaml
+F:	Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml
 F:	Documentation/devicetree/bindings/mips/econet.yaml
 F:	Documentation/devicetree/bindings/timer/econet,en751221-timer.yaml
 F:	arch/mips/boot/dts/econet/
 F:	arch/mips/econet/
 F:	drivers/clocksource/timer-econet-en751221.c
 F:	drivers/irqchip/irq-econet-en751221.c
+F:	include/dt-bindings/clock/econet,en751221-scu.h
+F:	include/dt-bindings/reset/econet,en751221-scu.h
 
 ECRYPT FILE SYSTEM
 M:	Tyler Hicks <code@tyhicks.com>
diff --git a/include/dt-bindings/clock/econet,en751221-scu.h b/include/dt-bindings/clock/econet,en751221-scu.h
new file mode 100644
index 000000000000..34179b8fe2f9
--- /dev/null
+++ b/include/dt-bindings/clock/econet,en751221-scu.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+
+#ifndef _DT_BINDINGS_CLOCK_ECONET_EN751221_SCU_H_
+#define _DT_BINDINGS_CLOCK_ECONET_EN751221_SCU_H_
+
+#define EN751221_CLK_PCIE	0
+#define EN751221_CLK_SPI	1
+#define EN751221_CLK_BUS	2
+#define EN751221_CLK_CPU	3
+#define EN751221_CLK_HPT	4
+#define EN751221_CLK_GSW	5
+
+#define EN751221_MAX_CLKS	6
+
+#endif /* _DT_BINDINGS_CLOCK_ECONET_EN751221_SCU_H_ */
diff --git a/include/dt-bindings/reset/econet,en751221-scu.h b/include/dt-bindings/reset/econet,en751221-scu.h
new file mode 100644
index 000000000000..bad499d4d50a
--- /dev/null
+++ b/include/dt-bindings/reset/econet,en751221-scu.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+
+#ifndef __DT_BINDINGS_RESET_CONTROLLER_ECONET_EN751221_H_
+#define __DT_BINDINGS_RESET_CONTROLLER_ECONET_EN751221_H_
+
+#define EN751221_XPON_PHY_RST		 0
+#define EN751221_PCM1_ZSI_ISI_RST	 1
+#define EN751221_FE_QDMA1_RST		 2
+#define EN751221_FE_QDMA2_RST		 3
+#define EN751221_FE_UNZIP_RST		 4
+#define EN751221_PCM2_RST		 5
+#define EN751221_PTM_MAC_RST		 6
+#define EN751221_CRYPTO_RST		 7
+#define EN751221_SAR_RST		 8
+#define EN751221_TIMER_RST		 9
+#define EN751221_INTC_RST		10
+#define EN751221_BONDING_RST		11
+#define EN751221_PCM1_RST		12
+#define EN751221_UART_RST		13
+#define EN751221_GPIO_RST		14
+#define EN751221_GDMA_RST		15
+#define EN751221_I2C_MASTER_RST		16
+#define EN751221_PCM2_ZSI_ISI_RST	17
+#define EN751221_SFC_RST		18
+#define EN751221_UART2_RST		19
+#define EN751221_GDMP_RST		20
+#define EN751221_FE_RST			21
+#define EN751221_USB_HOST_P0_RST	22
+#define EN751221_GSW_RST		23
+#define EN751221_SFC2_PCM_RST		24
+#define EN751221_PCIE0_RST		25
+#define EN751221_PCIE1_RST		26
+#define EN751221_CPU_TIMER_RST		27
+#define EN751221_PCIE_HB_RST		28
+#define EN751221_SIMIF_RST		29
+#define EN751221_XPON_MAC_RST		30
+#define EN751221_GFAST_RST		31
+#define EN751221_CPU_TIMER2_RST		32
+#define EN751221_UART3_RST		33
+#define EN751221_UART4_RST		34
+#define EN751221_UART5_RST		35
+#define EN751221_I2C2_RST		36
+#define EN751221_XSI_MAC_RST		37
+#define EN751221_XSI_PHY_RST		38
+#define EN751221_DMT_RST		39
+#define EN751221_USB_PHY_P0_RST		40
+#define EN751221_USB_PHY_P1_RST		41
+
+#endif /* __DT_BINDINGS_RESET_CONTROLLER_ECONET_EN751221_H_ */
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Re: [PATCH 1/8] dt-bindings: clock, reset: Add econet EN751221 bindings

[Krzysztof Kozlowski]

On Tue, Mar 03, 2026 at 07:09:41PM +0000, Caleb James DeLisle wrote:
> Add clock and reset bindings for EN751221 as well as
> a "chip-scu" which is an additional regmap that is used
> by the clock driver as well as others. This split of the
> SCU across two register areas is the same as the Airoha
> AN758x family.

Please wrap commit message according to Linux coding style / submission
process (neither too early nor over the limit):
https://elixir.bootlin.com/linux/v6.4-rc1/source/Documentation/process/submitting-patches.rst#L597

A nit, subject: drop second/last, redundant "bindings". The
"dt-bindings" prefix is already stating that these are bindings.
See also:
https://elixir.bootlin.com/linux/v6.17-rc3/source/Documentation/devicetree/bindings/submitting-patches.rst#L18

> 
> Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
> ---
>  .../bindings/clock/airoha,en7523-scu.yaml     | 19 ++++++-
>  .../mips/econet,en751221-chip-scu.yaml        | 41 ++++++++++++++++
>  MAINTAINERS                                   |  3 ++
>  .../dt-bindings/clock/econet,en751221-scu.h   | 15 ++++++
>  .../dt-bindings/reset/econet,en751221-scu.h   | 49 +++++++++++++++++++
>  5 files changed, 126 insertions(+), 1 deletion(-)
>  create mode 100644 Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml
>  create mode 100644 include/dt-bindings/clock/econet,en751221-scu.h
>  create mode 100644 include/dt-bindings/reset/econet,en751221-scu.h
> 
> diff --git a/Documentation/devicetree/bindings/clock/airoha,en7523-scu.yaml b/Documentation/devicetree/bindings/clock/airoha,en7523-scu.yaml
> index a8471367175b..e60e54273393 100644
> --- a/Documentation/devicetree/bindings/clock/airoha,en7523-scu.yaml
> +++ b/Documentation/devicetree/bindings/clock/airoha,en7523-scu.yaml
> @@ -32,6 +32,7 @@ properties:
>        - enum:
>            - airoha,en7523-scu
>            - airoha,en7581-scu
> +          - econet,en751221-scu
>  
>    reg:
>      items:
> @@ -67,7 +68,10 @@ allOf:
>    - if:
>        properties:
>          compatible:
> -          const: airoha,en7581-scu
> +          items:

Drop items, it's just enum

> +            - enum:
> +                - airoha,en7581-scu
> +                - econet,en751221-scu
>      then:
>        properties:
>          reg:
> @@ -98,3 +102,16 @@ examples:
>                #reset-cells = <1>;
>        };
>      };
> +
> +  - |
> +    soc {
> +      #address-cells = <1>;
> +      #size-cells = <1>;

No need for new example, especially without any differences. You already
have there two.

> +
> +      scuclk2: clock-controller@1fb00000 {
> +        compatible = "econet,en751221-scu";
> +        reg = <0x1fb00000 0x970>;
> +        #clock-cells = <1>;
> +        #reset-cells = <1>;
> +      };
> +    };
> diff --git a/Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml b/Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml
> new file mode 100644
> index 000000000000..7c7c8cf8d2a5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml
> @@ -0,0 +1,41 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mips/econet,en751221-chip-scu.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: EcoNet Chip SCU Controller for EN751221 SoC
> +
> +maintainers:
> +  - Caleb James DeLisle <cjd@cjdns.fr>
> +
> +description:
> +  The EcoNet chip-scu block provides a configuration interface for clock,
> +  io-muxing and other functionalities used by multiple controllers (e.g. clock,
> +  pinctrl, ecc) on EN751221 SoC.
> +
> +properties:
> +  compatible:
> +    items:
> +      - const: econet,en751221-chip-scu
> +      - const: syscon

And it does not fit existing syscon bindings file, because ... ?

> +
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    soc {
> +      #address-cells = <1>;
> +      #size-cells = <1>;
> +      syscon@1fa20000 {
> +        compatible = "econet,en751221-chip-scu", "syscon";
> +        reg = <0x1fa20000 0x388>;
> +      };
> +    };

...

> +
> +#define EN751221_MAX_CLKS	6

Drop, not a binding.

> +
> +#endif /* _DT_BINDINGS_CLOCK_ECONET_EN751221_SCU_H_ */
> diff --git a/include/dt-bindings/reset/econet,en751221-scu.h b/include/dt-bindings/reset/econet,en751221-scu.h
> new file mode 100644

Best regards,
Krzysztof


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Re: [PATCH 1/8] dt-bindings: clock, reset: Add econet EN751221 bindings

[Caleb James DeLisle]

On 04/03/2026 09:39, Krzysztof Kozlowski wrote:
> On Tue, Mar 03, 2026 at 07:09:41PM +0000, Caleb James DeLisle wrote:
>> Add clock and reset bindings for EN751221 as well as
>> a "chip-scu" which is an additional regmap that is used
>> by the clock driver as well as others. This split of the
>> SCU across two register areas is the same as the Airoha
>> AN758x family.
> Please wrap commit message according to Linux coding style / submission
> process (neither too early nor over the limit):
> https://elixir.bootlin.com/linux/v6.4-rc1/source/Documentation/process/submitting-patches.rst#L597
OK
> A nit, subject: drop second/last, redundant "bindings". The
> "dt-bindings" prefix is already stating that these are bindings.
> See also:
> https://elixir.bootlin.com/linux/v6.17-rc3/source/Documentation/devicetree/bindings/submitting-patches.rst#L18
OK
>> Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
>> ---
>>   .../bindings/clock/airoha,en7523-scu.yaml     | 19 ++++++-
>>   .../mips/econet,en751221-chip-scu.yaml        | 41 ++++++++++++++++
>>   MAINTAINERS                                   |  3 ++
>>   .../dt-bindings/clock/econet,en751221-scu.h   | 15 ++++++
>>   .../dt-bindings/reset/econet,en751221-scu.h   | 49 +++++++++++++++++++
>>   5 files changed, 126 insertions(+), 1 deletion(-)
>>   create mode 100644 Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml
>>   create mode 100644 include/dt-bindings/clock/econet,en751221-scu.h
>>   create mode 100644 include/dt-bindings/reset/econet,en751221-scu.h
>>
>> diff --git a/Documentation/devicetree/bindings/clock/airoha,en7523-scu.yaml b/Documentation/devicetree/bindings/clock/airoha,en7523-scu.yaml
>> index a8471367175b..e60e54273393 100644
>> --- a/Documentation/devicetree/bindings/clock/airoha,en7523-scu.yaml
>> +++ b/Documentation/devicetree/bindings/clock/airoha,en7523-scu.yaml
>> @@ -32,6 +32,7 @@ properties:
>>         - enum:
>>             - airoha,en7523-scu
>>             - airoha,en7581-scu
>> +          - econet,en751221-scu
>>   
>>     reg:
>>       items:
>> @@ -67,7 +68,10 @@ allOf:
>>     - if:
>>         properties:
>>           compatible:
>> -          const: airoha,en7581-scu
>> +          items:
> Drop items, it's just enum
>
>> +            - enum:
>> +                - airoha,en7581-scu
>> +                - econet,en751221-scu
>>       then:
>>         properties:
>>           reg:
>> @@ -98,3 +102,16 @@ examples:
>>                 #reset-cells = <1>;
>>         };
>>       };
>> +
>> +  - |
>> +    soc {
>> +      #address-cells = <1>;
>> +      #size-cells = <1>;
> No need for new example, especially without any differences. You already
> have there two.
OK
>> +
>> +      scuclk2: clock-controller@1fb00000 {
>> +        compatible = "econet,en751221-scu";
>> +        reg = <0x1fb00000 0x970>;
>> +        #clock-cells = <1>;
>> +        #reset-cells = <1>;
>> +      };
>> +    };
>> diff --git a/Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml b/Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml
>> new file mode 100644
>> index 000000000000..7c7c8cf8d2a5
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mips/econet,en751221-chip-scu.yaml
>> @@ -0,0 +1,41 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/mips/econet,en751221-chip-scu.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: EcoNet Chip SCU Controller for EN751221 SoC
>> +
>> +maintainers:
>> +  - Caleb James DeLisle <cjd@cjdns.fr>
>> +
>> +description:
>> +  The EcoNet chip-scu block provides a configuration interface for clock,
>> +  io-muxing and other functionalities used by multiple controllers (e.g. clock,
>> +  pinctrl, ecc) on EN751221 SoC.
>> +
>> +properties:
>> +  compatible:
>> +    items:
>> +      - const: econet,en751221-chip-scu
>> +      - const: syscon
> And it does not fit existing syscon bindings file, because ... ?


If you're asking why it needs to be named "econet,en751221-chip-scu" and 
not just "syscon", it's because the actual clock/scu searches for it by 
compatible. This is patterned after "airoha,en7581-chip-scu" ( 
https://lore.kernel.org/20241023-en7581-pinctrl-v9-1-afb0cbcab0ec@kernel.org 
).

I could drop this file and use "airoha,en7581-chip-scu" in the DT and 
clk driver, but I do not think it is identical to the actual EN7581 chip 
scu.

I could also drop the file and add "econet,en751221-chip-scu" as a 
compatible to airoha,en7581-chip-scu.yaml, but that file lives in /arm 
and this is a MIPS.

I chose this route because it seemed least hackish, but I would defer to 
your judgement on the matter.

>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    soc {
>> +      #address-cells = <1>;
>> +      #size-cells = <1>;
>> +      syscon@1fa20000 {
>> +        compatible = "econet,en751221-chip-scu", "syscon";
>> +        reg = <0x1fa20000 0x388>;
>> +      };
>> +    };
> ...
>
>> +
>> +#define EN751221_MAX_CLKS	6
> Drop, not a binding.
OK
>
>> +
>> +#endif /* _DT_BINDINGS_CLOCK_ECONET_EN751221_SCU_H_ */
>> diff --git a/include/dt-bindings/reset/econet,en751221-scu.h b/include/dt-bindings/reset/econet,en751221-scu.h
>> new file mode 100644


Thank you kindly for the prompt review.

Caleb


> Best regards,
> Krzysztof
>
>

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Re: [PATCH 1/8] dt-bindings: clock, reset: Add econet EN751221 bindings

[Krzysztof Kozlowski]

On 04/03/2026 10:09, Caleb James DeLisle wrote:
>>> +
>>> +description:
>>> +  The EcoNet chip-scu block provides a configuration interface for clock,
>>> +  io-muxing and other functionalities used by multiple controllers (e.g. clock,
>>> +  pinctrl, ecc) on EN751221 SoC.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    items:
>>> +      - const: econet,en751221-chip-scu
>>> +      - const: syscon
>> And it does not fit existing syscon bindings file, because ... ?
> 
> 
> If you're asking why it needs to be named "econet,en751221-chip-scu" and 

No, I am asking why you cannot put it with other syscon bindings - git
grep syscon? What is missing here (we expect complete binding for given
hardware)?



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Krzysztof

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Re: [PATCH 1/8] dt-bindings: clock, reset: Add econet EN751221 bindings

[Caleb James DeLisle]

On 04/03/2026 10:46, Krzysztof Kozlowski wrote:
> On 04/03/2026 10:09, Caleb James DeLisle wrote:
>>>> +
>>>> +description:
>>>> +  The EcoNet chip-scu block provides a configuration interface for clock,
>>>> +  io-muxing and other functionalities used by multiple controllers (e.g. clock,
>>>> +  pinctrl, ecc) on EN751221 SoC.
>>>> +
>>>> +properties:
>>>> +  compatible:
>>>> +    items:
>>>> +      - const: econet,en751221-chip-scu
>>>> +      - const: syscon
>>> And it does not fit existing syscon bindings file, because ... ?
>>
>> If you're asking why it needs to be named "econet,en751221-chip-scu" and
> No, I am asking why you cannot put it with other syscon bindings - git
> grep syscon? What is missing here (we expect complete binding for given
> hardware)?

Ahh so mfd/bindings/syscon.yaml, that looks fine to me. Two reasons I 
didn't do that: 1. didn't know it existed, 2. Assumed 
arm/airoha,en7581-chip-scu.yaml was done The Best Way Possible. I'll be 
happy to re-send using syscon.yaml

Thanks,

Caleb

>
>
> Best regards,
> Krzysztof

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[PATCH 2/8] clk: airoha: Add econet EN751221 clock/reset support to en7523-scu

[Caleb James DeLisle]

EcoNet EN751221 clock/reset driver is significantly similar to the
EN7523 / EN7581, however the EN751221 does not have a neat batch of clock
divider registers so there are fewer known clocks, and the frequency of
each clock is derived differently. This clock driver will probably work
correctly on EN751627, EN7528, and EN7580.

Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
---
 drivers/clk/Kconfig      |   6 +-
 drivers/clk/clk-en7523.c | 236 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 234 insertions(+), 8 deletions(-)

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 3d803b4cf5c1..47df6073a72b 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -218,13 +218,13 @@ config COMMON_CLK_CS2000_CP
 	  If you say yes here you get support for the CS2000 clock multiplier.
 
 config COMMON_CLK_EN7523
-	bool "Clock driver for Airoha EN7523 SoC system clocks"
+	bool "Clock driver for Airoha/EcoNet SoC system clocks"
 	depends on OF
-	depends on ARCH_AIROHA || COMPILE_TEST
+	depends on ARCH_AIROHA || ECONET || COMPILE_TEST
 	default ARCH_AIROHA
 	help
 	  This driver provides the fixed clocks and gates present on Airoha
-	  ARM silicon.
+	  and EcoNet silicon.
 
 config COMMON_CLK_EP93XX
 	tristate "Clock driver for Cirrus Logic ep93xx SoC"
diff --git a/drivers/clk/clk-en7523.c b/drivers/clk/clk-en7523.c
index 08cc8e5acf43..b31e6d3c91a2 100644
--- a/drivers/clk/clk-en7523.c
+++ b/drivers/clk/clk-en7523.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 
+#include <linux/bitfield.h>
 #include <linux/delay.h>
 #include <linux/clk-provider.h>
 #include <linux/io.h>
@@ -11,6 +12,8 @@
 #include <dt-bindings/clock/en7523-clk.h>
 #include <dt-bindings/reset/airoha,en7523-reset.h>
 #include <dt-bindings/reset/airoha,en7581-reset.h>
+#include <dt-bindings/clock/econet,en751221-scu.h>
+#include <dt-bindings/reset/econet,en751221-scu.h>
 
 #define RST_NR_PER_BANK			32
 
@@ -33,15 +36,47 @@
 #define   REG_RESET_CONTROL_PCIEHB	BIT(29)
 #define   REG_RESET_CONTROL_PCIE1	BIT(27)
 #define   REG_RESET_CONTROL_PCIE2	BIT(26)
+#define REG_HIR				0x064
+#define   REG_HIR_MASK			GENMASK(31, 16)
 /* EN7581 */
 #define REG_NP_SCU_PCIC			0x88
 #define REG_NP_SCU_SSTR			0x9c
 #define REG_PCIE_XSI0_SEL_MASK		GENMASK(14, 13)
 #define REG_PCIE_XSI1_SEL_MASK		GENMASK(12, 11)
 #define REG_CRYPTO_CLKSRC2		0x20c
+/* EN751221 */
+#define EN751221_REG_SPI_DIV		0x0cc
+#define EN751221_REG_SPI_DIV_MASK	GENMASK(31, 8)
+#define EN751221_SPI_BASE		500000000
+#define EN751221_SPI_BASE_EN7526C	400000000
+#define EN751221_REG_BUS		0x284
+#define EN751221_REG_BUS_MASK		GENMASK(21, 12)
+#define EN751221_REG_SSR3		0x094
+#define EN751221_REG_SSR3_GSW_MASK	GENMASK(9, 8)
 
 #define REG_RST_CTRL2			0x830
 #define REG_RST_CTRL1			0x834
+#define EN751221_REG_RST_DMT		0x84
+#define EN751221_REG_RST_USB		0xec
+
+enum en_hir {
+	HIR_UNKNOWN	= -1,
+	HIR_TC3169	= 0,
+	HIR_TC3182	= 1,
+	HIR_RT65168	= 2,
+	HIR_RT63165	= 3,
+	HIR_RT63365	= 4,
+	HIR_MT751020	= 5,
+	HIR_MT7505	= 6,
+	HIR_EN751221	= 7,
+	HIR_EN7526C	= 8,
+	HIR_EN751627	= 9,
+	HIR_EN7580	= 10,
+	HIR_EN7528	= 11,
+	HIR_EN7523	= 12,
+	HIR_EN7581	= 13,
+	HIR_MAX		= 14,
+};
 
 struct en_clk_desc {
 	int id;
@@ -93,6 +128,8 @@ static const u32 bus7581_base[] = { 600000000, 540000000 };
 static const u32 npu7581_base[] = { 800000000, 750000000, 720000000, 600000000 };
 static const u32 crypto_base[] = { 540000000, 480000000 };
 static const u32 emmc7581_base[] = { 200000000, 150000000 };
+/* EN751221 */
+static const u32 gsw751221_base[] = { 500000000, 250000000, 400000000, 200000000 };
 
 static const struct en_clk_desc en7523_base_clks[] = {
 	{
@@ -300,6 +337,13 @@ static const u16 en7581_rst_ofs[] = {
 	REG_RST_CTRL1,
 };
 
+static const u16 en751221_rst_ofs[] = {
+	REG_RST_CTRL2,
+	REG_RST_CTRL1,
+	EN751221_REG_RST_DMT,
+	EN751221_REG_RST_USB,
+};
+
 static const u16 en7523_rst_map[] = {
 	/* RST_CTRL2 */
 	[EN7523_XPON_PHY_RST]		= 0,
@@ -405,8 +449,61 @@ static const u16 en7581_rst_map[] = {
 	[EN7581_XPON_MAC_RST]		= RST_NR_PER_BANK + 31,
 };
 
+static const u16 en751221_rst_map[] = {
+	/* RST_CTRL2 */
+	[EN751221_XPON_PHY_RST]		= 0,
+	[EN751221_GFAST_RST]		= 1,
+	[EN751221_CPU_TIMER2_RST]	= 2,
+	[EN751221_UART3_RST]		= 3,
+	[EN751221_UART4_RST]		= 4,
+	[EN751221_UART5_RST]		= 5,
+	[EN751221_I2C2_RST]		= 6,
+	[EN751221_XSI_MAC_RST]		= 7,
+	[EN751221_XSI_PHY_RST]		= 8,
+
+	/* RST_CTRL1 */
+	[EN751221_PCM1_ZSI_ISI_RST]	= RST_NR_PER_BANK + 0,
+	[EN751221_FE_QDMA1_RST]		= RST_NR_PER_BANK + 1,
+	[EN751221_FE_QDMA2_RST]		= RST_NR_PER_BANK + 2,
+	[EN751221_FE_UNZIP_RST]		= RST_NR_PER_BANK + 3,
+	[EN751221_PCM2_RST]		= RST_NR_PER_BANK + 4,
+	[EN751221_PTM_MAC_RST]		= RST_NR_PER_BANK + 5,
+	[EN751221_CRYPTO_RST]		= RST_NR_PER_BANK + 6,
+	[EN751221_SAR_RST]		= RST_NR_PER_BANK + 7,
+	[EN751221_TIMER_RST]		= RST_NR_PER_BANK + 8,
+	[EN751221_INTC_RST]		= RST_NR_PER_BANK + 9,
+	[EN751221_BONDING_RST]		= RST_NR_PER_BANK + 10,
+	[EN751221_PCM1_RST]		= RST_NR_PER_BANK + 11,
+	[EN751221_UART_RST]		= RST_NR_PER_BANK + 12,
+	[EN751221_GPIO_RST]		= RST_NR_PER_BANK + 13,
+	[EN751221_GDMA_RST]		= RST_NR_PER_BANK + 14,
+	[EN751221_I2C_MASTER_RST]	= RST_NR_PER_BANK + 16,
+	[EN751221_PCM2_ZSI_ISI_RST]	= RST_NR_PER_BANK + 17,
+	[EN751221_SFC_RST]		= RST_NR_PER_BANK + 18,
+	[EN751221_UART2_RST]		= RST_NR_PER_BANK + 19,
+	[EN751221_GDMP_RST]		= RST_NR_PER_BANK + 20,
+	[EN751221_FE_RST]		= RST_NR_PER_BANK + 21,
+	[EN751221_USB_HOST_P0_RST]	= RST_NR_PER_BANK + 22,
+	[EN751221_GSW_RST]		= RST_NR_PER_BANK + 23,
+	[EN751221_SFC2_PCM_RST]		= RST_NR_PER_BANK + 25,
+	[EN751221_PCIE0_RST]		= RST_NR_PER_BANK + 26,
+	[EN751221_PCIE1_RST]		= RST_NR_PER_BANK + 27,
+	[EN751221_CPU_TIMER_RST]	= RST_NR_PER_BANK + 28,
+	[EN751221_PCIE_HB_RST]		= RST_NR_PER_BANK + 29,
+	[EN751221_SIMIF_RST]		= RST_NR_PER_BANK + 30,
+	[EN751221_XPON_MAC_RST]		= RST_NR_PER_BANK + 31,
+
+	/* RST_DMT */
+	[EN751221_DMT_RST]		= 2 * RST_NR_PER_BANK + 0,
+
+	/* RST_USB */
+	[EN751221_USB_PHY_P0_RST]	= 3 * RST_NR_PER_BANK + 6,
+	[EN751221_USB_PHY_P1_RST]	= 3 * RST_NR_PER_BANK + 7,
+};
+
 static int en7581_reset_register(struct device *dev, void __iomem *base,
-				 const u16 *rst_map, int nr_resets);
+				 const u16 *rst_map, int nr_resets,
+				 const u16 *rst_reg_ofs);
 
 static u32 en7523_get_base_rate(const struct en_clk_desc *desc, u32 val)
 {
@@ -604,7 +701,8 @@ static int en7523_clk_hw_init(struct platform_device *pdev,
 	en7523_register_clocks(&pdev->dev, clk_data, base, np_base);
 
 	return en7581_reset_register(&pdev->dev, np_base, en7523_rst_map,
-				     ARRAY_SIZE(en7523_rst_map));
+				     ARRAY_SIZE(en7523_rst_map),
+				     en7581_rst_ofs);
 }
 
 static void en7581_register_clocks(struct device *dev, struct clk_hw_onecell_data *clk_data,
@@ -705,7 +803,8 @@ static const struct reset_control_ops en7581_reset_ops = {
 };
 
 static int en7581_reset_register(struct device *dev, void __iomem *base,
-				 const u16 *rst_map, int nr_resets)
+				 const u16 *rst_map, int nr_resets,
+				 const u16 *rst_reg_ofs)
 {
 	struct en_rst_data *rst_data;
 
@@ -713,7 +812,7 @@ static int en7581_reset_register(struct device *dev, void __iomem *base,
 	if (!rst_data)
 		return -ENOMEM;
 
-	rst_data->bank_ofs = en7581_rst_ofs;
+	rst_data->bank_ofs = rst_reg_ofs;
 	rst_data->idx_map = rst_map;
 	rst_data->base = base;
 
@@ -752,7 +851,123 @@ static int en7581_clk_hw_init(struct platform_device *pdev,
 	writel(val | 3, base + REG_NP_SCU_PCIC);
 
 	return en7581_reset_register(&pdev->dev, base, en7581_rst_map,
-				     ARRAY_SIZE(en7581_rst_map));
+				     ARRAY_SIZE(en7581_rst_map),
+				     en7581_rst_ofs);
+}
+
+static enum en_hir get_hw_id(void __iomem *np_base)
+{
+	u32 val = FIELD_GET(REG_HIR_MASK, readl(np_base + REG_HIR));
+
+	if (val < HIR_MAX)
+		return (enum en_hir) val;
+
+	return HIR_UNKNOWN;
+}
+
+static void en751221_try_register_clk(struct device *dev, int key,
+				      struct clk_hw_onecell_data *clk_data,
+				      const char *name, u32 rate)
+{
+	struct clk_hw *hw;
+
+	hw = clk_hw_register_fixed_rate(dev, name, NULL, 0, rate);
+	if (IS_ERR(hw))
+		pr_err("Failed to register clk %s: %pe\n", name, hw);
+	else
+		clk_data->hws[key] = hw;
+}
+
+static void en751221_register_clocks(struct device *dev,
+				     struct clk_hw_onecell_data *clk_data,
+				     struct regmap *map, void __iomem *np_base)
+{
+	enum en_hir hid = get_hw_id(np_base);
+	struct clk_hw *hw;
+	u32 rate;
+	u32 div;
+	int err;
+
+	/* PCI */
+	hw = en7523_register_pcie_clk(dev, np_base);
+	clk_data->hws[EN751221_CLK_PCIE] = hw;
+
+	/* SPI */
+	rate = EN751221_SPI_BASE;
+	if (hid == HIR_EN7526C)
+		rate = EN751221_SPI_BASE_EN7526C;
+
+	err = regmap_read(map, EN751221_REG_SPI_DIV, &div);
+	if (err) {
+		pr_err("Failed reading fixed clk div %s: %d\n",
+		       "spi", err);
+	} else {
+		div = FIELD_GET(EN751221_REG_SPI_DIV_MASK, div) * 2;
+		if (!div)
+			div = 40;
+
+		en751221_try_register_clk(dev, EN751221_CLK_SPI, clk_data,
+					  "spi", rate / div);
+	}
+
+	/* BUS */
+	rate = FIELD_GET(EN751221_REG_BUS_MASK,
+			 readl(np_base + EN751221_REG_BUS));
+	rate *= 1000000;
+	en751221_try_register_clk(dev, EN751221_CLK_BUS, clk_data, "bus",
+				  rate);
+
+	/* CPU */
+	en751221_try_register_clk(dev, EN751221_CLK_CPU, clk_data, "cpu",
+				  rate * 4);
+
+	/* HPT */
+	switch (hid) {
+	case HIR_EN751221:
+	case HIR_EN751627:
+	case HIR_EN7526C:
+	case HIR_EN7580:
+	case HIR_EN7528:
+		rate = 200000000;
+		break;
+	case HIR_MT7505:
+		rate = 100000000;
+		break;
+	case HIR_MT751020:
+		rate = 800000000 / 3;
+		break;
+	default:
+		rate = 250000000;
+	}
+	en751221_try_register_clk(dev, EN751221_CLK_HPT, clk_data, "hpt",
+				  rate);
+
+	/* GSW */
+	rate = FIELD_GET(EN751221_REG_SSR3_GSW_MASK,
+			 readl(np_base + EN751221_REG_SSR3));
+	en751221_try_register_clk(dev, EN751221_CLK_GSW, clk_data, "gsw",
+				  gsw751221_base[rate]);
+}
+
+static int en751221_clk_hw_init(struct platform_device *pdev,
+				struct clk_hw_onecell_data *clk_data)
+{
+	struct regmap *map;
+	void __iomem *base;
+
+	map = syscon_regmap_lookup_by_compatible("econet,en751221-chip-scu");
+	if (IS_ERR(map))
+		return PTR_ERR(map);
+
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	en751221_register_clocks(&pdev->dev, clk_data, map, base);
+
+	return en7581_reset_register(&pdev->dev, base, en751221_rst_map,
+				     ARRAY_SIZE(en751221_rst_map),
+				     en751221_rst_ofs);
 }
 
 static int en7523_clk_probe(struct platform_device *pdev)
@@ -799,9 +1014,20 @@ static const struct en_clk_soc_data en7581_data = {
 	.hw_init = en7581_clk_hw_init,
 };
 
+static const struct en_clk_soc_data en751221_data = {
+	.num_clocks = EN751221_MAX_CLKS,
+	.pcie_ops = {
+		.is_enabled = en7523_pci_is_enabled,
+		.prepare = en7523_pci_prepare,
+		.unprepare = en7523_pci_unprepare,
+	},
+	.hw_init = en751221_clk_hw_init,
+};
+
 static const struct of_device_id of_match_clk_en7523[] = {
 	{ .compatible = "airoha,en7523-scu", .data = &en7523_data },
 	{ .compatible = "airoha,en7581-scu", .data = &en7581_data },
+	{ .compatible = "econet,en751221-scu", .data = &en751221_data },
 	{ /* sentinel */ }
 };
 
-- 
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[PATCH 3/8] dt-bindings: phy: Document PCIe PHY in EcoNet EN751221 and EN7528

[Caleb James DeLisle]

EN751221 and EN7528 SoCs have two PCIe slots, and each one has a
PHY which behaves slightly differently because one slot is Gen1/Gen2
while the other is Gen1 only.

Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
---
 .../phy/econet,en751221-pcie-phy.yaml         | 57 +++++++++++++++++++
 MAINTAINERS                                   |  6 ++
 2 files changed, 63 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml

diff --git a/Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml b/Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml
new file mode 100644
index 000000000000..8e1d3c791c6e
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/econet,en751221-pcie-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: EcoNet PCI-Express PHY for EcoNet EN751221 and EN7528
+
+maintainers:
+  - Caleb James DeLisle <cjd@cjdns.fr>
+
+description:
+  The PCIe PHY supports physical layer functionality for PCIe Gen1 and
+  Gen1/Gen2 ports. On these SoCs, port 0 is a Gen1-only port while
+  port 1 is Gen1/Gen2 capable.
+
+properties:
+  compatible:
+    enum:
+      - econet,en751221-pcie-phy0
+      - econet,en751221-pcie-phy1
+      - econet,en7528-pcie-phy0
+      - econet,en7528-pcie-phy1
+
+  reg:
+    maxItems: 1
+
+  "#phy-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - '#phy-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/phy/phy.h>
+    soc {
+      #address-cells = <1>;
+      #size-cells = <1>;
+
+      pcie_phy0: pcie-phy@1faf2000 {
+        compatible = "econet,en7528-pcie-phy0";
+        reg = <0x1faf2000 0x1000>;
+        #phy-cells = <0>;
+      };
+
+      pcie_phy1: pcie-phy@1fac0000 {
+        compatible = "econet,en7528-pcie-phy1";
+        reg = <0x1fac0000 0x1000>;
+        #phy-cells = <0>;
+      };
+    };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 56cf73ce91b8..ae053b1f174f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9123,6 +9123,12 @@ F:	drivers/irqchip/irq-econet-en751221.c
 F:	include/dt-bindings/clock/econet,en751221-scu.h
 F:	include/dt-bindings/reset/econet,en751221-scu.h
 
+ECONET PCIE PHY DRIVER
+M:	Caleb James DeLisle <cjd@cjdns.fr>
+L:	linux-mips@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml
+
 ECRYPT FILE SYSTEM
 M:	Tyler Hicks <code@tyhicks.com>
 L:	ecryptfs@vger.kernel.org
-- 
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Re: [PATCH 3/8] dt-bindings: phy: Document PCIe PHY in EcoNet EN751221 and EN7528

[Krzysztof Kozlowski]

On Tue, Mar 03, 2026 at 07:09:43PM +0000, Caleb James DeLisle wrote:
> EN751221 and EN7528 SoCs have two PCIe slots, and each one has a
> PHY which behaves slightly differently because one slot is Gen1/Gen2
> while the other is Gen1 only.
> 
> Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
> ---
>  .../phy/econet,en751221-pcie-phy.yaml         | 57 +++++++++++++++++++

Why are you mixing multiple subsystems in the same patchset? That's
like three or four different ones. Don't, just make it difficult to
apply pieces and understand the dependencies.

>  MAINTAINERS                                   |  6 ++
>  2 files changed, 63 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml b/Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml
> new file mode 100644
> index 000000000000..8e1d3c791c6e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml
> @@ -0,0 +1,57 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/econet,en751221-pcie-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: EcoNet PCI-Express PHY for EcoNet EN751221 and EN7528
> +
> +maintainers:
> +  - Caleb James DeLisle <cjd@cjdns.fr>
> +
> +description:
> +  The PCIe PHY supports physical layer functionality for PCIe Gen1 and
> +  Gen1/Gen2 ports. On these SoCs, port 0 is a Gen1-only port while
> +  port 1 is Gen1/Gen2 capable.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - econet,en751221-pcie-phy0
> +      - econet,en751221-pcie-phy1

What is the difference between phy0 and phy1? This must be explicitly
explained in the description.

If phy1 means "port 1" (although first sentence disagrees, because it
says that THE SAME phy supports two ports), then the names aren't -gen1
and -gen2? Or what are other differences?

> +      - econet,en7528-pcie-phy0
> +      - econet,en7528-pcie-phy1
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#phy-cells":
> +    const: 0
> +
> +required:
> +  - compatible
> +  - reg
> +  - '#phy-cells'

Use consisent quotes.

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/phy/phy.h>

Where do you use it here?

> +    soc {
> +      #address-cells = <1>;
> +      #size-cells = <1>;
> +
> +      pcie_phy0: pcie-phy@1faf2000 {

Drop unused label.

> +        compatible = "econet,en7528-pcie-phy0";
> +        reg = <0x1faf2000 0x1000>;
> +        #phy-cells = <0>;
> +      };
> +
> +      pcie_phy1: pcie-phy@1fac0000 {
> +        compatible = "econet,en7528-pcie-phy1";

Drop node, same as previous one.

Best regards,
Krzysztof


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Re: [PATCH 3/8] dt-bindings: phy: Document PCIe PHY in EcoNet EN751221 and EN7528

[Caleb James DeLisle]

On 04/03/2026 09:44, Krzysztof Kozlowski wrote:
> On Tue, Mar 03, 2026 at 07:09:43PM +0000, Caleb James DeLisle wrote:
>> EN751221 and EN7528 SoCs have two PCIe slots, and each one has a
>> PHY which behaves slightly differently because one slot is Gen1/Gen2
>> while the other is Gen1 only.
>>
>> Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
>> ---
>>   .../phy/econet,en751221-pcie-phy.yaml         | 57 +++++++++++++++++++
> Why are you mixing multiple subsystems in the same patchset? That's
> like three or four different ones. Don't, just make it difficult to
> apply pieces and understand the dependencies.


Please pardon my ignorance, I was under the impression that a patch 
should be specific to a subsystem but a patchset should accomplish a 
goal and avoid introducing unused code. In this case the goal is PCIe 
support. If you prefer it, I can resend as a PHY patchset and a CLK 
patchset, and then after those are merged, send the PCIe patchset to use 
them.


>
>>   MAINTAINERS                                   |  6 ++
>>   2 files changed, 63 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml b/Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml
>> new file mode 100644
>> index 000000000000..8e1d3c791c6e
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml
>> @@ -0,0 +1,57 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/phy/econet,en751221-pcie-phy.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: EcoNet PCI-Express PHY for EcoNet EN751221 and EN7528
>> +
>> +maintainers:
>> +  - Caleb James DeLisle <cjd@cjdns.fr>
>> +
>> +description:
>> +  The PCIe PHY supports physical layer functionality for PCIe Gen1 and
>> +  Gen1/Gen2 ports. On these SoCs, port 0 is a Gen1-only port while
>> +  port 1 is Gen1/Gen2 capable.
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - econet,en751221-pcie-phy0
>> +      - econet,en751221-pcie-phy1
> What is the difference between phy0 and phy1? This must be explicitly
> explained in the description.
>
> If phy1 means "port 1" (although first sentence disagrees, because it
> says that THE SAME phy supports two ports), then the names aren't -gen1
> and -gen2? Or what are other differences?


In practice, port0 is gen1 only and port1 is gen1/2. But I suppose it 
makes sense to specify them as gen1 and gen2, so that fact is documented 
in the DT.


>
>> +      - econet,en7528-pcie-phy0
>> +      - econet,en7528-pcie-phy1
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  "#phy-cells":
>> +    const: 0
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - '#phy-cells'
> Use consisent quotes.

OK

>
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/phy/phy.h>
> Where do you use it here?
Whoops, I think I daydreamed that it was needed for "#phy-cells", will 
drop.
>
>> +    soc {
>> +      #address-cells = <1>;
>> +      #size-cells = <1>;
>> +
>> +      pcie_phy0: pcie-phy@1faf2000 {
> Drop unused label.
OK
>
>> +        compatible = "econet,en7528-pcie-phy0";
>> +        reg = <0x1faf2000 0x1000>;
>> +        #phy-cells = <0>;
>> +      };
>> +
>> +      pcie_phy1: pcie-phy@1fac0000 {
>> +        compatible = "econet,en7528-pcie-phy1";
> Drop node, same as previous one.

OK


Thanks for the review.

Caleb


>
> Best regards,
> Krzysztof
>

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[PATCH 4/8] phy: econet: Add PCIe PHY driver for EcoNet EN751221 and EN7528 SoCs.

[Caleb James DeLisle]

Introduce support for EcoNet PCIe PHY controllers found in EN751221
and EN7528 SoCs, these SoCs are not identical but are similar, each
having one Gen1 port, and one Gen1/Gen2 port.

Co-developed-by: Ahmed Naseef <naseefkm@gmail.com>
Signed-off-by: Ahmed Naseef <naseefkm@gmail.com>
[cjd@cjdns.fr: add EN751221 support and refactor for clarity]
Co-developed-by: Caleb James DeLisle <cjd@cjdns.fr>
Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
---
 MAINTAINERS                   |   1 +
 drivers/phy/Kconfig           |  12 +++
 drivers/phy/Makefile          |   1 +
 drivers/phy/phy-econet-pcie.c | 180 ++++++++++++++++++++++++++++++++++
 4 files changed, 194 insertions(+)
 create mode 100644 drivers/phy/phy-econet-pcie.c

diff --git a/MAINTAINERS b/MAINTAINERS
index ae053b1f174f..5d4544590069 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9128,6 +9128,7 @@ M:	Caleb James DeLisle <cjd@cjdns.fr>
 L:	linux-mips@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/phy/econet,en751221-pcie-phy.yaml
+F:	drivers/phy/phy-econet-pcie.c
 
 ECRYPT FILE SYSTEM
 M:	Tyler Hicks <code@tyhicks.com>
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 02467dfd4fb0..60efc37f6eb0 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -123,6 +123,18 @@ config PHY_AIROHA_PCIE
 	  This driver create the basic PHY instance and provides initialize
 	  callback for PCIe GEN3 port.
 
+config PHY_ECONET_PCIE
+	tristate "EcoNet PCIe-PHY Driver"
+	depends on ECONET || COMPILE_TEST
+	depends on OF
+	select GENERIC_PHY
+	select REGMAP_MMIO
+	help
+	  Say Y here to add support for EcoNet PCIe PHY driver.
+	  This driver create the basic PHY instance and provides initialize
+	  callback for PCIe GEN1 and GEN2 ports. This PHY is found on
+	  EcoNet SoCs including EN751221 and EN7528.
+
 config PHY_NXP_PTN3222
 	tristate "NXP PTN3222 1-port eUSB2 to USB2 redriver"
 	depends on I2C
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index a648c2e02a83..a77f182ee8f3 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_PHY_PISTACHIO_USB)		+= phy-pistachio-usb.o
 obj-$(CONFIG_PHY_SNPS_EUSB2)		+= phy-snps-eusb2.o
 obj-$(CONFIG_USB_LGM_PHY)		+= phy-lgm-usb.o
 obj-$(CONFIG_PHY_AIROHA_PCIE)		+= phy-airoha-pcie.o
+obj-$(CONFIG_PHY_ECONET_PCIE)		+= phy-econet-pcie.o
 obj-$(CONFIG_PHY_NXP_PTN3222)		+= phy-nxp-ptn3222.o
 obj-$(CONFIG_PHY_SPACEMIT_K1_PCIE)	+= phy-spacemit-k1-pcie.o
 obj-$(CONFIG_GENERIC_PHY)		+= allwinner/	\
diff --git a/drivers/phy/phy-econet-pcie.c b/drivers/phy/phy-econet-pcie.c
new file mode 100644
index 000000000000..f9d6d061f54a
--- /dev/null
+++ b/drivers/phy/phy-econet-pcie.c
@@ -0,0 +1,180 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Author: Caleb James DeLisle <cjd@cjdns.fr>
+ *	   Ahmed Naseef <naseefkm@gmail.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+/* Rx detection timing for EN751221: 16*8 clock cycles  */
+#define EN751221_RXDET_VAL		16
+
+/* Rx detection timing when in power mode 3 */
+#define EN75_RXDET_P3_REG		0xa28
+#define EN75_RXDET_P3_MASK		GENMASK(17, 9)
+
+/* Rx detection timing when in power mode 2 */
+#define EN75_RXDET_P2_REG		0xa2c
+#define EN75_RXDET_P2_MASK		GENMASK(8, 0)
+
+/* Rx impedance */
+#define EN75_RX_IMPEDANCE_REG		0xb2c
+#define EN75_RX_IMPEDANCE_MASK		GENMASK(13, 12)
+enum en75_rx_impedance {
+	EN75_RX_IMPEDANCE_100_OHM	= 0,
+	EN75_RX_IMPEDANCE_95_OHM	= 1,
+	EN75_RX_IMPEDANCE_90_OHM	= 2,
+};
+
+/* PLL Invert clock */
+#define EN75_PLL_PH_INV_REG		0x4a0
+#define EN75_PLL_PH_INV_MASK		BIT(5)
+
+struct en75_phy_op {
+	u32 reg;
+	u32 mask;
+	u32 val;
+};
+
+struct en7528_pcie_phy {
+	struct regmap *regmap;
+	const struct en75_phy_op *data;
+};
+
+/* Port 0 PHY: set LCDDS_CLK_PH_INV for PLL operation */
+static const struct en75_phy_op en7528_phy_port0[] = {
+	{
+		.reg = EN75_PLL_PH_INV_REG,
+		.mask = EN75_PLL_PH_INV_MASK,
+		.val = 1,
+	},
+	{ /* sentinel */ }
+};
+
+/* EN7528 Port 1 PHY: Rx impedance tuning, target R -5 Ohm */
+static const struct en75_phy_op en7528_phy_port1[] = {
+	{
+		.reg = EN75_RX_IMPEDANCE_REG,
+		.mask = EN75_RX_IMPEDANCE_MASK,
+		.val = EN75_RX_IMPEDANCE_95_OHM,
+	},
+	{ /* sentinel */ }
+};
+
+/* EN751221 Port 1 PHY, set RX detect to 16*8 clock cycles */
+static const struct en75_phy_op en751221_phy_port1[] = {
+	{
+		.reg = EN75_RXDET_P3_REG,
+		.mask = EN75_RXDET_P3_MASK,
+		.val = EN751221_RXDET_VAL,
+	},
+	{
+		.reg = EN75_RXDET_P2_REG,
+		.mask = EN75_RXDET_P2_MASK,
+		.val = EN751221_RXDET_VAL,
+	},
+	{ /* sentinel */ }
+};
+
+static int en75_pcie_phy_init(struct phy *phy)
+{
+	struct en7528_pcie_phy *ephy = phy_get_drvdata(phy);
+	const struct en75_phy_op *data = ephy->data;
+	int i, ret;
+	u32 val;
+
+	for (i = 0; data[i].mask || data[i].val; i++) {
+		if (i)
+			usleep_range(1000, 2000);
+
+		val = field_prep(data[i].mask, data[i].val);
+
+		ret = regmap_update_bits(ephy->regmap, data[i].reg,
+					 data[i].mask, val);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static const struct phy_ops en75_pcie_phy_ops = {
+	.init	= en75_pcie_phy_init,
+	.owner	= THIS_MODULE,
+};
+
+static int en75_pcie_phy_probe(struct platform_device *pdev)
+{
+	struct regmap_config regmap_config = {
+		.reg_bits = 32,
+		.val_bits = 32,
+		.reg_stride = 4,
+	};
+	struct device *dev = &pdev->dev;
+	const struct en75_phy_op *data;
+	struct phy_provider *provider;
+	struct en7528_pcie_phy *ephy;
+	void __iomem *base;
+	struct phy *phy;
+	int i;
+
+	data = of_device_get_match_data(dev);
+	if (!data)
+		return -EINVAL;
+
+	ephy = devm_kzalloc(dev, sizeof(*ephy), GFP_KERNEL);
+	if (!ephy)
+		return -ENOMEM;
+
+	ephy->data = data;
+
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	/* Set max_register to highest used register */
+	for (i = 0; data[i].mask || data[i].val; i++)
+		if (data[i].reg > regmap_config.max_register)
+			regmap_config.max_register = data[i].reg;
+
+	ephy->regmap = devm_regmap_init_mmio(dev, base, &regmap_config);
+	if (IS_ERR(ephy->regmap))
+		return PTR_ERR(ephy->regmap);
+
+	phy = devm_phy_create(dev, dev->of_node, &en75_pcie_phy_ops);
+	if (IS_ERR(phy))
+		return PTR_ERR(phy);
+
+	phy_set_drvdata(phy, ephy);
+
+	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+	return PTR_ERR_OR_ZERO(provider);
+}
+
+static const struct of_device_id en75_pcie_phy_ids[] = {
+	{ .compatible = "econet,en7528-pcie-phy0", .data = en7528_phy_port0 },
+	{ .compatible = "econet,en7528-pcie-phy1", .data = en7528_phy_port1 },
+	{ .compatible = "econet,en751221-pcie-phy0", .data = en7528_phy_port0 },
+	{ .compatible = "econet,en751221-pcie-phy1", .data = en751221_phy_port1 },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, en75_pcie_phy_ids);
+
+static struct platform_driver en75_pcie_phy_driver = {
+	.probe = en75_pcie_phy_probe,
+	.driver = {
+		.name = "econet-pcie-phy",
+		.of_match_table = en75_pcie_phy_ids,
+	},
+};
+module_platform_driver(en75_pcie_phy_driver);
+
+MODULE_AUTHOR("Caleb James DeLisle <cjd@cjdns.fr>");
+MODULE_DESCRIPTION("EcoNet PCIe PHY driver");
+MODULE_LICENSE("GPL");
-- 
2.39.5


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[PATCH 5/8] dt-bindings: PCI: mediatek: Add support for EcoNet EN7528

[Caleb James DeLisle]

Introduce EcoNet EN7528 SoC compatible in MediaTek PCIe controller
binding.

EcoNet PCIe controller has the same configuration model as
Mediatek v2 but is initiallized more similarly to an MT7621
PCIe.

Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
---
 Documentation/devicetree/bindings/pci/mediatek-pcie.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/pci/mediatek-pcie.yaml b/Documentation/devicetree/bindings/pci/mediatek-pcie.yaml
index 0b8c78ec4f91..57cbfbff7a31 100644
--- a/Documentation/devicetree/bindings/pci/mediatek-pcie.yaml
+++ b/Documentation/devicetree/bindings/pci/mediatek-pcie.yaml
@@ -14,6 +14,7 @@ properties:
     oneOf:
       - enum:
           - airoha,an7583-pcie
+          - econet,en7528-pcie
           - mediatek,mt2712-pcie
           - mediatek,mt7622-pcie
           - mediatek,mt7629-pcie
-- 
2.39.5


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[PATCH 6/8] PCI: mediatek: Add support for EcoNet EN7528 SoC

[Caleb James DeLisle]

Add support for the PCIe present on the EcoNet EN7528 (and EN751221) SoCs.

These SoCs have a mix of Gen1 and Gen2 capable ports, but the Gen2 ports
require re-training after startup.

Signed-off-by: Ahmed Naseef <naseefkm@gmail.com>
[cjd@cjdns.fr: Trivial change, reorder of_device_id alphabetical]
Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
---
 drivers/pci/controller/Kconfig         |   2 +-
 drivers/pci/controller/pcie-mediatek.c | 107 +++++++++++++++++++++++++
 2 files changed, 108 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index 5aaed8ac6e44..f6a5fcacb38d 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -209,7 +209,7 @@ config PCI_MVEBU
 
 config PCIE_MEDIATEK
 	tristate "MediaTek PCIe controller"
-	depends on ARCH_AIROHA || ARCH_MEDIATEK || COMPILE_TEST
+	depends on ARCH_AIROHA || ARCH_MEDIATEK || ECONET || COMPILE_TEST
 	depends on OF
 	depends on PCI_MSI
 	select IRQ_MSI_LIB
diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index 5defa5cc4c2b..742edd05ee2b 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -77,6 +77,7 @@
 
 #define PCIE_CONF_VEND_ID	0x100
 #define PCIE_CONF_DEVICE_ID	0x102
+#define PCIE_CONF_REV_CLASS	0x104
 #define PCIE_CONF_CLASS_ID	0x106
 
 #define PCIE_INT_MASK		0x420
@@ -89,6 +90,11 @@
 #define MSI_MASK		BIT(23)
 #define MTK_MSI_IRQS_NUM	32
 
+#define EN7528_HOST_MODE	0x00804201
+#define EN7528_LINKUP_REG	0x50
+#define EN7528_RC0_LINKUP	BIT(1)
+#define EN7528_RC1_LINKUP	BIT(2)
+
 #define PCIE_AHB_TRANS_BASE0_L	0x438
 #define PCIE_AHB_TRANS_BASE0_H	0x43c
 #define AHB2PCIE_SIZE(x)	((x) & GENMASK(4, 0))
@@ -753,6 +759,86 @@ static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
 	return 0;
 }
 
+static int mtk_pcie_startup_port_en7528(struct mtk_pcie_port *port)
+{
+	struct mtk_pcie *pcie = port->pcie;
+	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
+	struct resource *mem = NULL;
+	struct resource_entry *entry;
+	u32 val, link_mask;
+	int err;
+
+	entry = resource_list_first_type(&host->windows, IORESOURCE_MEM);
+	if (entry)
+		mem = entry->res;
+	if (!mem)
+		return -EINVAL;
+
+	if (!pcie->cfg) {
+		dev_err(pcie->dev, "EN7528: pciecfg syscon not available\n");
+		return -EINVAL;
+	}
+
+	/* Assert all reset signals */
+	writel(0, port->base + PCIE_RST_CTRL);
+
+	/*
+	 * Enable PCIe link down reset, if link status changed from link up to
+	 * link down, this will reset MAC control registers and configuration
+	 * space.
+	 */
+	writel(PCIE_LINKDOWN_RST_EN, port->base + PCIE_RST_CTRL);
+
+	/*
+	 * Described in PCIe CEM specification sections 2.2 (PERST# Signal) and
+	 * 2.2.1 (Initial Power-Up (G3 to S0)). The deassertion of PERST#
+	 * should be delayed 100ms (TPVPERL) for the power and clock to become
+	 * stable.
+	 */
+	msleep(100);
+
+	/* De-assert PHY, PE, PIPE, MAC and configuration reset */
+	val = readl(port->base + PCIE_RST_CTRL);
+	val |= PCIE_PHY_RSTB | PCIE_PERSTB | PCIE_PIPE_SRSTB |
+	       PCIE_MAC_SRSTB | PCIE_CRSTB;
+	writel(val, port->base + PCIE_RST_CTRL);
+
+	writel(PCIE_CLASS_CODE | PCIE_REVISION_ID,
+	       port->base + PCIE_CONF_REV_CLASS);
+	writel(EN7528_HOST_MODE, port->base);
+
+	link_mask = (port->slot == 0) ? EN7528_RC0_LINKUP : EN7528_RC1_LINKUP;
+
+	/* 100ms timeout value should be enough for Gen1/2 training */
+	err = regmap_read_poll_timeout(pcie->cfg, EN7528_LINKUP_REG, val,
+				       !!(val & link_mask), 20,
+				       100 * USEC_PER_MSEC);
+	if (err) {
+		dev_err(pcie->dev, "EN7528: port%d link timeout\n", port->slot);
+		return -ETIMEDOUT;
+	}
+
+	/* Set INTx mask */
+	val = readl(port->base + PCIE_INT_MASK);
+	val &= ~INTX_MASK;
+	writel(val, port->base + PCIE_INT_MASK);
+
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		mtk_pcie_enable_msi(port);
+
+	/* Set AHB to PCIe translation windows */
+	val = lower_32_bits(mem->start) |
+	      AHB2PCIE_SIZE(fls(resource_size(mem)));
+	writel(val, port->base + PCIE_AHB_TRANS_BASE0_L);
+
+	val = upper_32_bits(mem->start);
+	writel(val, port->base + PCIE_AHB_TRANS_BASE0_H);
+
+	writel(WIN_ENABLE, port->base + PCIE_AXI_WINDOW0);
+
+	return 0;
+}
+
 static void __iomem *mtk_pcie_map_bus(struct pci_bus *bus,
 				      unsigned int devfn, int where)
 {
@@ -1149,6 +1235,20 @@ static int mtk_pcie_probe(struct platform_device *pdev)
 	if (err)
 		goto put_resources;
 
+	/* Retrain Gen1 links to reach Gen2 where supported */
+	if (pcie->soc->startup == mtk_pcie_startup_port_en7528) {
+		struct pci_bus *bus = host->bus;
+		struct pci_dev *rc = NULL;
+
+		while ((rc = pci_get_class(PCI_CLASS_BRIDGE_PCI << 8, rc))) {
+			if (rc->bus != bus)
+				continue;
+			if (!pcie_retrain_link(rc, true))
+				dev_info(dev, "port%d link retrained\n",
+					 PCI_SLOT(rc->devfn));
+		}
+	}
+
 	return 0;
 
 put_resources:
@@ -1264,8 +1364,15 @@ static const struct mtk_pcie_soc mtk_pcie_soc_mt7629 = {
 	.quirks = MTK_PCIE_FIX_CLASS_ID | MTK_PCIE_FIX_DEVICE_ID,
 };
 
+static const struct mtk_pcie_soc mtk_pcie_soc_en7528 = {
+	.ops = &mtk_pcie_ops_v2,
+	.startup = mtk_pcie_startup_port_en7528,
+	.setup_irq = mtk_pcie_setup_irq,
+};
+
 static const struct of_device_id mtk_pcie_ids[] = {
 	{ .compatible = "airoha,an7583-pcie", .data = &mtk_pcie_soc_an7583 },
+	{ .compatible = "econet,en7528-pcie", .data = &mtk_pcie_soc_en7528 },
 	{ .compatible = "mediatek,mt2701-pcie", .data = &mtk_pcie_soc_v1 },
 	{ .compatible = "mediatek,mt7623-pcie", .data = &mtk_pcie_soc_v1 },
 	{ .compatible = "mediatek,mt2712-pcie", .data = &mtk_pcie_soc_mt2712 },
-- 
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Re: [PATCH 6/8] PCI: mediatek: Add support for EcoNet EN7528 SoC

[kernel test robot]

Hi Caleb,

kernel test robot noticed the following build errors:

[auto build test ERROR on 3fa5e5702a82d259897bd7e209469bc06368bf31]

url:    https://github.com/intel-lab-lkp/linux/commits/Caleb-James-DeLisle/dt-bindings-clock-reset-Add-econet-EN751221-bindings/20260304-031451
base:   3fa5e5702a82d259897bd7e209469bc06368bf31
patch link:    https://lore.kernel.org/r/20260303190948.694783-7-cjd%40cjdns.fr
patch subject: [PATCH 6/8] PCI: mediatek: Add support for EcoNet EN7528 SoC
config: parisc-allmodconfig (https://download.01.org/0day-ci/archive/20260307/202603070131.ufbXMWzw-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260307/202603070131.ufbXMWzw-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603070131.ufbXMWzw-lkp@intel.com/

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "pcie_retrain_link" [drivers/pci/controller/pcie-mediatek.ko] undefined!

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[PATCH 7/8] PCI: Skip bridge window reads when window is not supported

[Caleb James DeLisle]

pci_read_bridge_io() and pci_read_bridge_mmio_pref() read bridge window
registers unconditionally. If the registers are hardwired to zero
(not implemented), both base and limit will be 0. Since (0 <= 0) is
true, a bogus window [mem 0x00000000-0x000fffff] or [io 0x0000-0x0fff]
gets created.

pci_read_bridge_windows() already detects unsupported windows by
testing register writability and sets io_window/pref_window flags
accordingly. Check these flags at the start of pci_read_bridge_io()
and pci_read_bridge_mmio_pref() to skip reading registers when the
window is not supported.

Suggested-by: Bjorn Helgaas <helgaas@kernel.org>
Signed-off-by: Ahmed Naseef <naseefkm@gmail.com>
Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
---
 drivers/pci/probe.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index bccc7a4bdd79..4eacb741b4ec 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -395,6 +395,9 @@ static void pci_read_bridge_io(struct pci_dev *dev, struct resource *res,
 	unsigned long io_mask, io_granularity, base, limit;
 	struct pci_bus_region region;
 
+	if (!dev->io_window)
+		return;
+
 	io_mask = PCI_IO_RANGE_MASK;
 	io_granularity = 0x1000;
 	if (dev->io_window_1k) {
@@ -465,6 +468,9 @@ static void pci_read_bridge_mmio_pref(struct pci_dev *dev, struct resource *res,
 	pci_bus_addr_t base, limit;
 	struct pci_bus_region region;
 
+	if (!dev->pref_window)
+		return;
+
 	pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
 	pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
 	base64 = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
-- 
2.39.5


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Re: [PATCH 7/8] PCI: Skip bridge window reads when window is not supported

[Bjorn Helgaas]

On Tue, Mar 03, 2026 at 07:09:47PM +0000, Caleb James DeLisle wrote:
> pci_read_bridge_io() and pci_read_bridge_mmio_pref() read bridge window
> registers unconditionally. If the registers are hardwired to zero
> (not implemented), both base and limit will be 0. Since (0 <= 0) is
> true, a bogus window [mem 0x00000000-0x000fffff] or [io 0x0000-0x0fff]
> gets created.
> 
> pci_read_bridge_windows() already detects unsupported windows by
> testing register writability and sets io_window/pref_window flags
> accordingly. Check these flags at the start of pci_read_bridge_io()
> and pci_read_bridge_mmio_pref() to skip reading registers when the
> window is not supported.
> 
> Suggested-by: Bjorn Helgaas <helgaas@kernel.org>

I think this refers to the conversation at:

  https://lore.kernel.org/r/20260113210259.GA715789@bhelgaas/

Can you include that URL for reference?

> Signed-off-by: Ahmed Naseef <naseefkm@gmail.com>
> Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

> ---
>  drivers/pci/probe.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index bccc7a4bdd79..4eacb741b4ec 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -395,6 +395,9 @@ static void pci_read_bridge_io(struct pci_dev *dev, struct resource *res,
>  	unsigned long io_mask, io_granularity, base, limit;
>  	struct pci_bus_region region;
>  
> +	if (!dev->io_window)
> +		return;
> +
>  	io_mask = PCI_IO_RANGE_MASK;
>  	io_granularity = 0x1000;
>  	if (dev->io_window_1k) {
> @@ -465,6 +468,9 @@ static void pci_read_bridge_mmio_pref(struct pci_dev *dev, struct resource *res,
>  	pci_bus_addr_t base, limit;
>  	struct pci_bus_region region;
>  
> +	if (!dev->pref_window)
> +		return;
> +
>  	pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
>  	pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
>  	base64 = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
> -- 
> 2.39.5
> 

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Re: [PATCH 7/8] PCI: Skip bridge window reads when window is not supported

[Caleb James DeLisle]

On 03/03/2026 22:23, Bjorn Helgaas wrote:
> On Tue, Mar 03, 2026 at 07:09:47PM +0000, Caleb James DeLisle wrote:
>> pci_read_bridge_io() and pci_read_bridge_mmio_pref() read bridge window
>> registers unconditionally. If the registers are hardwired to zero
>> (not implemented), both base and limit will be 0. Since (0 <= 0) is
>> true, a bogus window [mem 0x00000000-0x000fffff] or [io 0x0000-0x0fff]
>> gets created.
>>
>> pci_read_bridge_windows() already detects unsupported windows by
>> testing register writability and sets io_window/pref_window flags
>> accordingly. Check these flags at the start of pci_read_bridge_io()
>> and pci_read_bridge_mmio_pref() to skip reading registers when the
>> window is not supported.
>>
>> Suggested-by: Bjorn Helgaas <helgaas@kernel.org>
> I think this refers to the conversation at:
>
>    https://lore.kernel.org/r/20260113210259.GA715789@bhelgaas/
>
> Can you include that URL for reference?


Sure thing, I'll resend with a Link: (I guess that's the appropriate 
method) after a few days.

Thanks,

Caleb


>
>> Signed-off-by: Ahmed Naseef <naseefkm@gmail.com>
>> Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
> Acked-by: Bjorn Helgaas <bhelgaas@google.com>
>
>> ---
>>   drivers/pci/probe.c | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
>> index bccc7a4bdd79..4eacb741b4ec 100644
>> --- a/drivers/pci/probe.c
>> +++ b/drivers/pci/probe.c
>> @@ -395,6 +395,9 @@ static void pci_read_bridge_io(struct pci_dev *dev, struct resource *res,
>>   	unsigned long io_mask, io_granularity, base, limit;
>>   	struct pci_bus_region region;
>>   
>> +	if (!dev->io_window)
>> +		return;
>> +
>>   	io_mask = PCI_IO_RANGE_MASK;
>>   	io_granularity = 0x1000;
>>   	if (dev->io_window_1k) {
>> @@ -465,6 +468,9 @@ static void pci_read_bridge_mmio_pref(struct pci_dev *dev, struct resource *res,
>>   	pci_bus_addr_t base, limit;
>>   	struct pci_bus_region region;
>>   
>> +	if (!dev->pref_window)
>> +		return;
>> +
>>   	pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
>>   	pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
>>   	base64 = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
>> -- 
>> 2.39.5
>>

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Re: [PATCH 7/8] PCI: Skip bridge window reads when window is not supported

[Bjorn Helgaas]

On Tue, Mar 03, 2026 at 07:09:47PM +0000, Caleb James DeLisle wrote:
> pci_read_bridge_io() and pci_read_bridge_mmio_pref() read bridge window
> registers unconditionally. If the registers are hardwired to zero
> (not implemented), both base and limit will be 0. Since (0 <= 0) is
> true, a bogus window [mem 0x00000000-0x000fffff] or [io 0x0000-0x0fff]
> gets created.
> 
> pci_read_bridge_windows() already detects unsupported windows by
> testing register writability and sets io_window/pref_window flags
> accordingly. Check these flags at the start of pci_read_bridge_io()
> and pci_read_bridge_mmio_pref() to skip reading registers when the
> window is not supported.

BTW, I'm still interested in the details of how we got here.  It
shouldn't be too unusual to have a bridge without an I/O window or
maybe even without a prefetchable (64-bit) memory window.

> Suggested-by: Bjorn Helgaas <helgaas@kernel.org>
> Signed-off-by: Ahmed Naseef <naseefkm@gmail.com>
> Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
> ---
>  drivers/pci/probe.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index bccc7a4bdd79..4eacb741b4ec 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -395,6 +395,9 @@ static void pci_read_bridge_io(struct pci_dev *dev, struct resource *res,
>  	unsigned long io_mask, io_granularity, base, limit;
>  	struct pci_bus_region region;
>  
> +	if (!dev->io_window)
> +		return;
> +
>  	io_mask = PCI_IO_RANGE_MASK;
>  	io_granularity = 0x1000;
>  	if (dev->io_window_1k) {
> @@ -465,6 +468,9 @@ static void pci_read_bridge_mmio_pref(struct pci_dev *dev, struct resource *res,
>  	pci_bus_addr_t base, limit;
>  	struct pci_bus_region region;
>  
> +	if (!dev->pref_window)
> +		return;
> +
>  	pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
>  	pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
>  	base64 = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
> -- 
> 2.39.5
> 

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Re: [PATCH 7/8] PCI: Skip bridge window reads when window is not supported

[Ahmed Naseef]

On Tue, Mar 03, 2026 at 03:37:23PM -0600, Bjorn Helgaas wrote:
> On Tue, Mar 03, 2026 at 07:09:47PM +0000, Caleb James DeLisle wrote:
> > pci_read_bridge_io() and pci_read_bridge_mmio_pref() read bridge window
> > registers unconditionally. If the registers are hardwired to zero
> > (not implemented), both base and limit will be 0. Since (0 <= 0) is
> > true, a bogus window [mem 0x00000000-0x000fffff] or [io 0x0000-0x0fff]
> > gets created.
> > 
> > pci_read_bridge_windows() already detects unsupported windows by
> > testing register writability and sets io_window/pref_window flags
> > accordingly. Check these flags at the start of pci_read_bridge_io()
> > and pci_read_bridge_mmio_pref() to skip reading registers when the
> > window is not supported.
> 
> BTW, I'm still interested in the details of how we got here.  It
> shouldn't be too unusual to have a bridge without an I/O window or
> maybe even without a prefetchable (64-bit) memory window.
> 
Hi Bjorn,

I'm fairly new to the PCI subsystem, so please correct me if
any of my understanding below is wrong.

Regarding the I/O window check: I only hit the issue with the
prefetchable window. The I/O window check was added per your
suggestion in our earlier discussion, since the same logic
applies. Neither downstream device (MT7603, MT7663) has I/O
BARs, so I haven't been able to test that path.

The EN7528 SoC's PCIe bridge does not implement the optional
prefetchable memory window , the registers are hardwired to
zero. The downstream device (MT7663 WiFi) has 64-bit
prefetchable BARs.

The problem is that pci_read_bridge_bases() reads these
registers without checking pref_window. With both base and
limit hardwired to zero, base(0) <= limit(0) evaluates true,
creating a bogus [mem 0x00000000-0x000fffff pref] window.
This makes the allocator believe the bridge has a prefetch
window and route the prefetchable BARs through it. But since
the hardware can't actually forward through this non-existent
window, the device becomes unreachable.

This patch skips the register read when pref_window is not
set, so no bogus resource is created, and the allocator
correctly falls back to the non-prefetchable MMIO window.

As to why this hasn't surfaced before , I'm not sure. It may
depend on whether pci_read_bridge_bases() gets called on a
given platform and whether the downstream devices have
prefetchable BARs. But I don't have enough experience with
other platforms to say for certain.

Reagrds,
Ahmed Naseef

> > Suggested-by: Bjorn Helgaas <helgaas@kernel.org>
> > Signed-off-by: Ahmed Naseef <naseefkm@gmail.com>
> > Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
> > ---
> >  drivers/pci/probe.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> > index bccc7a4bdd79..4eacb741b4ec 100644
> > --- a/drivers/pci/probe.c
> > +++ b/drivers/pci/probe.c
> > @@ -395,6 +395,9 @@ static void pci_read_bridge_io(struct pci_dev *dev, struct resource *res,
> >  	unsigned long io_mask, io_granularity, base, limit;
> >  	struct pci_bus_region region;
> >  
> > +	if (!dev->io_window)
> > +		return;
> > +
> >  	io_mask = PCI_IO_RANGE_MASK;
> >  	io_granularity = 0x1000;
> >  	if (dev->io_window_1k) {
> > @@ -465,6 +468,9 @@ static void pci_read_bridge_mmio_pref(struct pci_dev *dev, struct resource *res,
> >  	pci_bus_addr_t base, limit;
> >  	struct pci_bus_region region;
> >  
> > +	if (!dev->pref_window)
> > +		return;
> > +
> >  	pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
> >  	pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
> >  	base64 = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
> > -- 
> > 2.39.5
> > 

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[PATCH 8/8] mips: dts: Add PCIe to EcoNet EN751221

[Caleb James DeLisle]

Add PCIe based on EN7528 PCIe driver, also add two MT76 wifi devices
to SmartFiber XP8421-B.

Signed-off-by: Caleb James DeLisle <cjd@cjdns.fr>
---
 arch/mips/boot/dts/econet/en751221.dtsi       | 114 ++++++++++++++++++
 .../econet/en751221_smartfiber_xp8421-b.dts   |  21 ++++
 arch/mips/econet/Kconfig                      |   2 +
 3 files changed, 137 insertions(+)

diff --git a/arch/mips/boot/dts/econet/en751221.dtsi b/arch/mips/boot/dts/econet/en751221.dtsi
index 2abeef5b744a..5568486ad8b5 100644
--- a/arch/mips/boot/dts/econet/en751221.dtsi
+++ b/arch/mips/boot/dts/econet/en751221.dtsi
@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 /dts-v1/;
 
+#include <dt-bindings/clock/econet,en751221-scu.h>
+
 / {
 	compatible = "econet,en751221";
 	#address-cells = <1>;
@@ -30,6 +32,30 @@ cpuintc: interrupt-controller {
 		#interrupt-cells = <1>;
 	};
 
+	chip_scu: syscon@1fa20000 {
+		compatible = "econet,en751221-chip-scu", "syscon";
+		reg = <0x1fa20000 0x388>;
+	};
+
+	pcie_phy1: pcie-phy@1fac0000 {
+		compatible = "econet,en751221-pcie-phy1";
+		reg = <0x1fac0000 0x1000>;
+		#phy-cells = <0>;
+	};
+
+	pcie_phy0: pcie-phy@1faf2000 {
+		compatible = "econet,en751221-pcie-phy0";
+		reg = <0x1faf2000 0x1000>;
+		#phy-cells = <0>;
+	};
+
+	scuclk: clock-controller@1fb00000 {
+		compatible = "econet,en751221-scu", "syscon";
+		reg = <0x1fb00000 0x970>;
+		#clock-cells = <1>;
+		#reset-cells = <1>;
+	};
+
 	intc: interrupt-controller@1fb40000 {
 		compatible = "econet,en751221-intc";
 		reg = <0x1fb40000 0x100>;
@@ -41,6 +67,94 @@ intc: interrupt-controller@1fb40000 {
 		econet,shadow-interrupts = <7 2>, <8 3>, <13 12>, <30 29>;
 	};
 
+	pciecfg: pciecfg@1fb80000 {
+		compatible = "mediatek,generic-pciecfg", "syscon";
+		reg = <0x1fb80000 0x1000>;
+	};
+
+	pcie0: pcie@1fb81000 {
+		compatible = "econet,en7528-pcie";
+		device_type = "pci";
+		reg = <0x1fb81000 0x1000>;
+		reg-names = "port0";
+		linux,pci-domain = <0>;
+		#address-cells = <3>;
+		#size-cells = <2>;
+		interrupt-parent = <&intc>;
+		interrupts = <23>;
+		interrupt-names = "pcie_irq";
+		clocks = <&scuclk EN751221_CLK_PCIE>;
+		clock-names = "sys_ck0";
+		phys = <&pcie_phy0>;
+		phy-names = "pcie-phy0";
+		bus-range = <0x00 0xff>;
+		ranges = <0x01000000 0 0x00000000 0x1f600000 0 0x00008000>,
+			 <0x82000000 0 0x20000000 0x20000000 0 0x08000000>;
+		status = "disabled";
+
+		#interrupt-cells = <1>;
+		interrupt-map-mask = <0 0 0 7>;
+		interrupt-map = <0 0 0 1 &pcie_intc0 0>,
+				<0 0 0 2 &pcie_intc0 1>,
+				<0 0 0 3 &pcie_intc0 2>,
+				<0 0 0 4 &pcie_intc0 3>;
+
+		pcie_intc0: interrupt-controller {
+			interrupt-controller;
+			#address-cells = <0>;
+			#interrupt-cells = <1>;
+		};
+
+		slot0: pcie@0,0 {
+			reg = <0x0000 0 0 0 0>;
+			device_type = "pci";
+			#address-cells = <3>;
+			#size-cells = <2>;
+			ranges;
+		};
+	};
+
+	pcie1: pcie@1fb83000 {
+		compatible = "econet,en7528-pcie";
+		device_type = "pci";
+		reg = <0x1fb83000 0x1000>;
+		reg-names = "port1";
+		linux,pci-domain = <1>;
+		#address-cells = <3>;
+		#size-cells = <2>;
+		interrupt-parent = <&intc>;
+		interrupts = <24>;
+		interrupt-names = "pcie_irq";
+		clocks = <&scuclk EN751221_CLK_PCIE>;
+		clock-names = "sys_ck1";
+		phys = <&pcie_phy1>;
+		phy-names = "pcie-phy1";
+		bus-range = <0x00 0xff>;
+		ranges = <0x81000000 0 0x00000000 0x1f608000 0 0x00008000>,
+			 <0x82000000 0 0x28000000 0x28000000 0 0x08000000>;
+		status = "disabled";
+
+		#interrupt-cells = <1>;
+		interrupt-map-mask = <0 0 0 7>;
+		interrupt-map = <0 0 0 1 &pcie_intc1 0>,
+				<0 0 0 2 &pcie_intc1 1>,
+				<0 0 0 3 &pcie_intc1 2>,
+				<0 0 0 4 &pcie_intc1 3>;
+
+		pcie_intc1: interrupt-controller {
+			interrupt-controller;
+			#address-cells = <0>;
+			#interrupt-cells = <1>;
+		};
+
+		slot1: pcie@1,0 {
+			reg = <0x0800 0 0 0 0>;
+			#address-cells = <3>;
+			#size-cells = <2>;
+			ranges;
+		};
+	};
+
 	uart: serial@1fbf0000 {
 		compatible = "ns16550";
 		reg = <0x1fbf0000 0x30>;
diff --git a/arch/mips/boot/dts/econet/en751221_smartfiber_xp8421-b.dts b/arch/mips/boot/dts/econet/en751221_smartfiber_xp8421-b.dts
index 8223c5bce67f..c633bf73add6 100644
--- a/arch/mips/boot/dts/econet/en751221_smartfiber_xp8421-b.dts
+++ b/arch/mips/boot/dts/econet/en751221_smartfiber_xp8421-b.dts
@@ -17,3 +17,24 @@ chosen {
 		linux,usable-memory-range = <0x00020000 0x1bfe0000>;
 	};
 };
+
+&pcie0 {
+	status = "okay";
+};
+&slot0 {
+	wifi@0,0 {
+		/* MT7612E */
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+	};
+};
+&pcie1 {
+	status = "okay";
+};
+&slot1 {
+	wifi@0,0 {
+		/* MT7592 */
+		compatible = "mediatek,mt76";
+		reg = <0x0000 0 0 0 0>;
+	};
+};
diff --git a/arch/mips/econet/Kconfig b/arch/mips/econet/Kconfig
index fd69884cc9a8..b37b9d25d5a4 100644
--- a/arch/mips/econet/Kconfig
+++ b/arch/mips/econet/Kconfig
@@ -13,7 +13,9 @@ choice
 		bool "EN751221 family"
 		select COMMON_CLK
 		select ECONET_EN751221_INTC
+		select HAVE_PCI
 		select IRQ_MIPS_CPU
+		select PCI_DRIVERS_GENERIC
 		select SMP
 		select SMP_UP
 		select SYS_SUPPORTS_SMP
-- 
2.39.5


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