linux-kernel - Re: [PATCH v4 1/5] dt-bindings: phy: Document Samsung UFS PHY bindings

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Date:   Sat, 4 Apr 2020 19:54:16 -0600
From:   Rob Herring <robh@...nel.org>
To:     Alim Akhtar <alim.akhtar@...sung.com>
Cc:     devicetree@...r.kernel.org, linux-scsi@...r.kernel.org,
        krzk@...nel.org, avri.altman@....com, martin.petersen@...cle.com,
        kwmad.kim@...sung.com, stanley.chu@...iatek.com,
        cang@...eaurora.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/5] dt-bindings: phy: Document Samsung UFS PHY
 bindings

On Fri, Mar 27, 2020 at 10:36:34PM +0530, Alim Akhtar wrote:
> This patch documents Samsung UFS PHY device tree bindings
> 
> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
> ---
>  .../bindings/phy/samsung,ufs-phy.yaml         | 67 +++++++++++++++++++
>  1 file changed, 67 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/samsung,ufs-phy.yaml
> 
> diff --git a/Documentation/devicetree/bindings/phy/samsung,ufs-phy.yaml b/Documentation/devicetree/bindings/phy/samsung,ufs-phy.yaml
> new file mode 100644
> index 000000000000..41ba481ecc76
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/samsung,ufs-phy.yaml
> @@ -0,0 +1,67 @@
> +# SPDX-License-Identifier: (GPL-2.0)

Dual license new bindings:

(GPL-2.0-only OR BSD-2-Clause)

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/phy/samsung,ufs-phy.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung SoC series UFS PHY Device Tree Bindings
> +
> +maintainers:
> +  - Alim Akhtar <alim.akhtar@...sung.com>
> +
> +properties:
> +  "#phy-cells":
> +    const: 0
> +
> +  compatible:
> +    enum:
> +      - samsung,exynos7-ufs-phy
> +
> +  reg:
> +    maxItems: 1
> +    description: PHY base register address
> +
> +  reg-names:
> +    items:
> +      - const: phy-pma
> +
> +  clocks:
> +    items:
> +      - description: PLL reference clock
> +      - description: Referencec clock parrent
> +
> +  clock-names:
> +    items:
> +      - const: ref_clk_parent
> +      - const: ref_clk

Doesn't match what 'clocks' says.

Also, why do you need the parent in DT? Just use clk_get_parent(). DT 
should reflect actual h/w clock connections (not what the driver 
happens to need). Also, there's the assigned-clocks binding.

> +
> +  samsung,pmu-syscon:
> +    $ref: '/schemas/types.yaml#/definitions/phandle'
> +    description: phandle for PMU system controller interface, used to
> +                 control pmu registers for power isolation

We have a binding for power domains. Use that for power isolation.

> +
> +required:
> +  - "#phy-cells"
> +  - compatible
> +  - reg
> +  - reg-names
> +  - clocks
> +  - clock-names
> +  - samsung,pmu-syscon
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/exynos7-clk.h>
> +
> +    ufs_phy: ufs-phy@...71800 {
> +        compatible = "samsung,exynos7-ufs-phy";
> +        reg = <0x15571800 0x240>;
> +        reg-names = "phy-pma";
> +        samsung,pmu-syscon = <&pmu_system_controller>;
> +        #phy-cells = <0>;
> +        clocks = <&clock_fsys1 MOUT_FSYS1_PHYCLK_SEL1>,
> +                 <&clock_top1 CLK_SCLK_PHY_FSYS1_26M>;
> +        clock-names = "ref_clk_parent",
> +                      "ref_clk";
> +    };
> +...
> 
> base-commit: fb33c6510d5595144d585aa194d377cf74d31911
> -- 
> 2.17.1
>