linux-kernel - Re: [PATCH v1 1/2] dt-bindings: phy: intel-sdxc-phy: Add YAML schema for LGM SDXC PHY

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Date:   Wed, 28 Aug 2019 20:07:42 +0800
From:   "Ramuthevar, Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        cheol.yong.kim@...el.com, qi-ming.wu@...el.com,
        peter.harliman.liem@...el.com
Subject: Re: [PATCH v1 1/2] dt-bindings: phy: intel-sdxc-phy: Add YAML schema
 for LGM SDXC PHY

Hi  Rob,

Thank you for the review comments.

On 28/8/2019 7:39 PM, Rob Herring wrote:
> On Tue, Aug 27, 2019 at 10:47 PM Ramuthevar, Vadivel MuruganX
> <vadivel.muruganx.ramuthevar@...ux.intel.com> wrote:
>> Hi Rob,
>>
>> On 27/8/2019 8:39 PM, Rob Herring wrote:
>>> On Tue, Aug 27, 2019 at 3:27 AM Ramuthevar,Vadivel MuruganX
>>> <vadivel.muruganx.ramuthevar@...ux.intel.com> wrote:
>>>> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
>>>>
>>>> Add a YAML schema to use the host controller driver with the
>>>> SDXC PHY on Intel's Lightning Mountain SoC.
>>>>
>>>> Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
>>>> ---
>>>>    .../bindings/phy/intel,lgm-sdxc-phy.yaml           | 50 ++++++++++++++++++++++
>>>>    1 file changed, 50 insertions(+)
>>>>    create mode 100644 Documentation/devicetree/bindings/phy/intel,lgm-sdxc-phy.yaml
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/phy/intel,lgm-sdxc-phy.yaml b/Documentation/devicetree/bindings/phy/intel,lgm-sdxc-phy.yaml
>>>> new file mode 100644
>>>> index 000000000000..be05020880bf
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/phy/intel,lgm-sdxc-phy.yaml
>>>> @@ -0,0 +1,50 @@
>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/phy/intel,lgm-sdxc-phy.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: Intel Lightning Mountain(LGM) SDXC PHY Device Tree Bindings
>>>> +
>>>> +maintainers:
>>>> +  - Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
>>>> +
>>>> +description: Binding for SDXC PHY
>>>> +
>>>> +properties:
>>>> +  compatible:
>>>> +    const: intel,lgm-sdxc-phy
>>>> +
>>>> +  intel,syscon:
>>>> +    description: phandle to the sdxc through syscon
>>>> +    $ref: '/schemas/types.yaml#/definitions/phandle'
>>>> +
>>>> +  clocks:
>>>> +    maxItems: 1
>>>> +
>>>> +  clock-names:
>>>> +    maxItems: 1
>>>> +
>>>> +  "#phy-cells":
>>>> +    const: 0
>>>> +
>>>> +required:
>>>> +  - "#phy-cells"
>>>> +  - compatible
>>>> +  - intel,syscon
>>>> +  - clocks
>>>> +  - clock-names
>>>> +
>>>> +additionalProperties: false
>>>> +
>>>> +examples:
>>>> +  - |
>>>> +    sdxc_phy: sdxc_phy {
>>>> +        compatible = "intel,lgm-sdxc-phy";
>>>> +        intel,syscon = <&sysconf>;
>>> Rather than a phandle, can this be a child node of sysconf? You need a
>>> binding for sysconf first anyways.
>> intel,syscon is phandle, emmc_phy is not child node of sysconf, access
>> emmc_phy
>> register over sysconf so made as reference here.
> How do you access the emmc_phy registers? They are part of the sysconf
> address space or the sysconf provides some sort of indirect register
> access? In case of the former, then emmc_phy should be a child node.
> That's actually fairly common.

Agreed!, you are correct. I have created two files one for syscon and 
other one is for emmc-phy

Documentation/devicetree/bindings/phy/intel,syscon.yaml
Documentation/devicetree/bindings/phy/intel,lgm-sdxc-phy.yaml

As you said earlier mail, first syscon bindings to be there, sending the 
patch as well.

Regards
Vadivel
> Rob
>