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 06:39:32 -0500
From:   Rob Herring <robh@...nel.org>
To:     "Ramuthevar, Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
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

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.

Rob