linux-kernel - Re: [PATCH v3 2/3] dt-bindings: msm: dsi: document phy-type property for 7nm dsi phy

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Date:   Tue, 8 Jun 2021 23:47:02 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jonathan Marek <jonathan@...ek.ca>
Cc:     freedreno@...ts.freedesktop.org, Rob Clark <robdclark@...il.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        Anurag Kumar Vulisha <anurag.kumar.vulisha@...inx.com>,
        Swapnil Jakhade <sjakhade@...ence.com>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <dri-devel@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] dt-bindings: msm: dsi: document phy-type property
 for 7nm dsi phy

Hi Jonathan,

Thank you for the patch.

On Tue, Jun 08, 2021 at 03:53:28PM -0400, Jonathan Marek wrote:
> Document a new phy-type property which will be used to determine whether
> the phy should operate in D-PHY or C-PHY mode.
> 
> Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
> ---
>  .../devicetree/bindings/display/msm/dsi-phy-7nm.yaml          | 4 ++++
>  include/dt-bindings/phy/phy.h                                 | 2 ++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/msm/dsi-phy-7nm.yaml b/Documentation/devicetree/bindings/display/msm/dsi-phy-7nm.yaml
> index bf16b1c65e10..d447b517ea19 100644
> --- a/Documentation/devicetree/bindings/display/msm/dsi-phy-7nm.yaml
> +++ b/Documentation/devicetree/bindings/display/msm/dsi-phy-7nm.yaml
> @@ -34,6 +34,10 @@ properties:
>      description: |
>        Connected to VDD_A_DSI_PLL_0P9 pin (or VDDA_DSI{0,1}_PLL_0P9 for sm8150)
>  
> +  phy-type:
> +    description: |
> +      D-PHY (default) or C-PHY mode: PHY_TYPE_DSI_DPHY or PHY_TYPE_DSI_CPHY
> +
>  required:
>    - compatible
>    - reg
> diff --git a/include/dt-bindings/phy/phy.h b/include/dt-bindings/phy/phy.h
> index 887a31b250a8..b978dac16bb8 100644
> --- a/include/dt-bindings/phy/phy.h
> +++ b/include/dt-bindings/phy/phy.h
> @@ -20,5 +20,7 @@
>  #define PHY_TYPE_XPCS		7
>  #define PHY_TYPE_SGMII		8
>  #define PHY_TYPE_QSGMII		9
> +#define PHY_TYPE_DSI_DPHY	10
> +#define PHY_TYPE_DSI_CPHY	11

The MIPI D-PHY and C-PHY apply to both DSI and CSI. I'd name this
PHY_TYPE_DPHY and PHY_TYPE_CPHY, or possibly, PHY_TYPE_MIPI_DPHY and
PHY_TYPE_MIPI_CPHY, without a DSI prefix. With this addressed and the DT
bindings updated accordingly,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

(You may be asked to split this in two patches though, not sure)

>  #endif /* _DT_BINDINGS_PHY */

-- 
Regards,

Laurent Pinchart