linux-kernel - Re: [PATCH v2 1/5] dt-bindings: display/msm: Document MDSS on SA8775P

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Message-ID: <ZvVgmFUs2bwfEoWD@hu-bjorande-lv.qualcomm.com>
Date: Thu, 26 Sep 2024 06:24:40 -0700
From: Bjorn Andersson <quic_bjorande@...cinc.com>
To: Mahadevan <quic_mahap@...cinc.com>
CC: <robdclark@...il.com>, <quic_abhinavk@...cinc.com>,
        <dmitry.baryshkov@...aro.org>, <sean@...rly.run>,
        <marijn.suijten@...ainline.org>, <airlied@...il.com>,
        <daniel@...ll.ch>, <maarten.lankhorst@...ux.intel.com>,
        <mripard@...nel.org>, <tzimmermann@...e.de>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <swboyd@...omium.org>,
        <konrad.dybcio@...aro.org>, <danila@...xyga.com>,
        <bigfoot@...ssfun.cn>, <neil.armstrong@...aro.org>,
        <mailingradian@...il.com>, <quic_jesszhan@...cinc.com>,
        <andersson@...nel.org>, <linux-arm-msm@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <freedreno@...ts.freedesktop.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <quic_kalyant@...cinc.com>, <quic_jmadiset@...cinc.com>,
        <quic_vpolimer@...cinc.com>
Subject: Re: [PATCH v2 1/5] dt-bindings: display/msm: Document MDSS on SA8775P

On Thu, Sep 26, 2024 at 04:31:33PM +0530, Mahadevan wrote:
> Document the MDSS hardware found on the Qualcomm SA8775P platform.
> 
> Signed-off-by: Mahadevan <quic_mahap@...cinc.com>
> ---
> 
> [v2]
> - Use fake DISPCC nodes to avoid clock dependencies in dt-bindings. [Dmitry]
> - Update bindings by fixing dt_binding_check tool errors (update includes in example),
>   adding proper spacing and indentation in binding example, dropping unused labels,
>   dropping status disable, adding reset node. [Dmitry, Rob, Krzysztof]

No concerns with the changelog, but please adopt b4 (go/upstream has
instructions) for sending patches upstream.

> 
> ---
>  .../display/msm/qcom,sa8775p-mdss.yaml        | 239 ++++++++++++++++++
>  1 file changed, 239 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/msm/qcom,sa8775p-mdss.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/msm/qcom,sa8775p-mdss.yaml b/Documentation/devicetree/bindings/display/msm/qcom,sa8775p-mdss.yaml
> new file mode 100644
> index 000000000000..e610b66ffa9f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/msm/qcom,sa8775p-mdss.yaml
> @@ -0,0 +1,239 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/msm/qcom,sa8775p-mdss.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Technologies, Inc. SA87755P Display MDSS
> +
> +maintainers:
> +  - Mahadevan <quic_mahap@...cinc.com>

Please use Firstname Lastname, if possible

> +
> +description:
> +  SA8775P MSM Mobile Display Subsystem(MDSS), which encapsulates sub-blocks like
> +  DPU display controller, DP interfaces and EDP etc.
> +
> +$ref: /schemas/display/msm/mdss-common.yaml#
> +
[..]
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interconnect/qcom,icc.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/qcom,sa8775p-gcc.h>
> +    #include <dt-bindings/interconnect/qcom,sa8775p-rpmh.h>
> +    #include <dt-bindings/power/qcom,rpmhpd.h>
> +    #include <dt-bindings/power/qcom-rpmpd.h>
> +
> +    display-subsystem@...0000 {
> +        compatible = "qcom,sa8775p-mdss";
> +        reg = <0 0x0ae00000 0 0x1000>;

#address-cells and #size-cells are 1 in the example root node, so drop
the two 0 entries.

> +        reg-names = "mdss";
> +
> +        /* same path used twice */

What do you mean? All three paths below are unique.

> +        interconnects = <&mmss_noc MASTER_MDP0 0 &mc_virt SLAVE_EBI1 0>,
> +                        <&mmss_noc MASTER_MDP1 0 &mc_virt SLAVE_EBI1 0>,
> +                        <&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ACTIVE_ONLY
> +                        &config_noc SLAVE_DISPLAY_CFG QCOM_ICC_TAG_ACTIVE_ONLY>;
> +        interconnect-names = "mdp0-mem",
> +                             "mdp1-mem",
> +                             "cpu-cfg";
> +
> +

Regards,
Bjorn