linux-kernel - Re: [PATCH v2 2/5] dt-bindings: phy: Add STM32MP25 COMBOPHY bindings

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Message-ID: <20240818160424.GA156214-robh@kernel.org>
Date: Sun, 18 Aug 2024 10:04:24 -0600
From: Rob Herring <robh@...nel.org>
To: Christian Bruel <christian.bruel@...s.st.com>
Cc: vkoul@...nel.org, kishon@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, mcoquelin.stm32@...il.com,
	alexandre.torgue@...s.st.com, p.zabel@...gutronix.de,
	linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	fabrice.gasnier@...s.st.com
Subject: Re: [PATCH v2 2/5] dt-bindings: phy: Add STM32MP25 COMBOPHY bindings

On Fri, Aug 16, 2024 at 03:20:54PM +0200, Christian Bruel wrote:
> Document the bindings for STM32 COMBOPHY interface, used to support
> the PCIe and USB3 stm32mp25 drivers.
> Following entries can be used to tune caracterisation parameters
>  - st,output-micro-ohms and st,output-vswing-microvolt bindings entries
> to tune the impedance and voltage swing using discrete simulation results
>  - st,rx-equalizer register to set the internal rx equalizer filter value.
> 
> Signed-off-by: Christian Bruel <christian.bruel@...s.st.com>
> ---
>  .../bindings/phy/st,stm32-combophy.yaml       | 144 ++++++++++++++++++
>  1 file changed, 144 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/st,stm32-combophy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/st,stm32-combophy.yaml b/Documentation/devicetree/bindings/phy/st,stm32-combophy.yaml
> new file mode 100644
> index 000000000000..c33a843b83a3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/st,stm32-combophy.yaml
> @@ -0,0 +1,144 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/st,stm32-combophy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: STMicroelectronics STM32MP25 USB3/PCIe COMBOPHY
> +
> +maintainers:
> +  - Christian Bruel <christian.bruel@...s.st.com>
> +
> +description:
> +  Single lane PHY shared (exclusive) between the USB3 and PCIe controllers.
> +  Supports 5Gbit/s for USB3 and PCIe gen2 or 2.5Gbit/s for PCIe gen1.
> +
> +properties:
> +  compatible:
> +    const: st,stm32mp25-combophy
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#phy-cells":
> +    const: 1
> +    description: |
> +      The cells contain the following arguments.
> +
> +      - description: The PHY type
> +          enum:
> +            - PHY_TYPE_USB3
> +            - PHY_TYPE_PCIE
> +
> +  clocks:
> +    minItems: 2
> +    items:
> +      - description: apb Bus clock mandatory to access registers.
> +      - description: ker Internal RCC reference clock for USB3 or PCIe
> +      - description: pad Optional on board clock input for PCIe only. Typically an
> +                     external 100Mhz oscillator wired on dedicated CLKIN pad. Used as reference
> +                     clock input instead of the ker
> +
> +  clock-names:
> +    minItems: 2
> +    items:
> +      - const: apb
> +      - const: ker
> +      - const: pad
> +
> +  resets:
> +    maxItems: 1
> +
> +  reset-names:
> +    const: phy
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  wakeup-source: true
> +
> +  interrupts:
> +    maxItems: 1
> +    description: interrupt used for wakeup
> +
> +  access-controllers:
> +    minItems: 1
> +    maxItems: 2
> +
> +  st,syscfg:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: Phandle to the SYSCON entry required for configuring PCIe
> +      or USB3.
> +
> +  st,ssc-on:
> +    type: boolean
> +    description:
> +      A boolean property whose presence indicates that the SSC for common clock
> +      needs to be set.
> +
> +  st,rx-equalizer:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    minimum: 0
> +    maximum: 7
> +    default: 2
> +    description:
> +      A 3 bit value to tune the RX fixed equalizer setting for optimal eye compliance
> +
> +  st,output-micro-ohms:
> +    minimum: 3999000
> +    maximum: 6090000
> +    default: 4968000
> +    description:
> +      A value property to tune the Single Ended Output Impedance, simulations results
> +      at 25C for a VDDP=0.8V. The hardware accepts discrete values in this range.
> +
> +  st,output-vswing-microvolt:
> +    minimum: 442000
> +    maximum: 803000
> +    default: 803000
> +    description:
> +      A value property in microvolt to tune the Single Ended Output Voltage Swing to change the
> +      Vlo, Vhi for a VDDP = 0.8V. The hardware accepts discrete values in this range.
> +
> +required:
> +  - compatible
> +  - reg
> +  - st,syscfg
> +  - '#phy-cells'
> +  - resets
> +  - reset-names
> +  - clocks
> +  - clock-names
> +
> +allOf:
> +  - if:
> +      required:
> +        - wakeup-source
> +    then:
> +      anyOf:
> +        - required: [interrupts]
> +        - required: [interrupts-extended]

Drop this if/then. We should have this somewhere common as it applies to 
all.

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>