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From:   Sumit Semwal <sumit.semwal@linaro.org>
Date:   Tue, 21 Jul 2020 17:46:20 +0530
Message-ID: <CAO_48GFREVQ8q=thFw4gJp0wu1MYHkxHi3sxDr8ejRyyY-6_0Q@mail.gmail.com>
Subject: Re: [PATCH 1/2] dt-bindings: display: panel: Add bindings for Tianma
 nt36672a panel
To:     Rob Herring <robh@kernel.org>
Cc:     Thierry Reding <thierry.reding@gmail.com>,
        Sam Ravnborg <sam@ravnborg.org>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>,
        Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
        "David S . Miller" <davem@davemloft.net>,
        LKML <linux-kernel@vger.kernel.org>,
        DRI mailing list <dri-devel@lists.freedesktop.org>,
        devicetree@vger.kernel.org
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Sender: linux-kernel-owner@vger.kernel.org
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Hello Rob,

Thanks for the review!
On Tue, 21 Jul 2020 at 09:03, Rob Herring <robh@kernel.org> wrote:
>
> On Thu, Jul 16, 2020 at 09:08:57PM +0530, Sumit Semwal wrote:
> > The nt36672a panel from Tianma is a FHD+ panel with a resolution of 1080x2246
> > and 6.18 inches size. It is found in some of the Poco F1 phones.
> >
> > Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
> > ---
> >  .../display/panel/tianma,nt36672a.yaml        | 110 ++++++++++++++++++
> >  1 file changed, 110 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/display/panel/tianma,nt36672a.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/display/panel/tianma,nt36672a.yaml b/Documentation/devicetree/bindings/display/panel/tianma,nt36672a.yaml
> > new file mode 100644
> > index 000000000000..3c583ca926ee
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/panel/tianma,nt36672a.yaml
> > @@ -0,0 +1,110 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/display/panel/tianma,nt36672a.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Tianma model NT36672A DSI Panel display driver
> > +
> > +maintainers:
> > +  - Sumit Semwal <sumit.semwal@linaro.org>
> > +
> > +description: |
> > +  The nt36672a panel from Tianma is a FHD+ LCD display panel with a resolution
> > +  of 1080x2246. It is a video mode DSI panel.
> > +
> > +allOf:
> > +  - $ref: panel-common.yaml#
> > +
> > +properties:
> > +  compatible:
> > +    const: tianma,nt36672a
> > +
> > +  reg:
> > +    description: DSI virtual channel of the peripheral
> > +
> > +  reset-gpios:
> > +    description: phandle of gpio for reset line - This should be 8mA, gpio
> > +      can be configured using mux, pinctrl, pinctrl-names (active high)
> > +
> > +  vddio-supply:
> > +    description: phandle of the regulator that provides the supply voltage
> > +      Power IC supply
> > +
> > +  vddpos-supply:
> > +    description: phandle of the positive boost supply regulator
> > +
> > +  vddneg-supply:
> > +    description: phandle of the negative boost supply regulator
> > +
> > +  pinctrl-names:
> > +    description: Pinctrl for panel active and suspend
> > +
> > +  pinctrl-0:
> > +    description: Active pinctrls
> > +
> > +  pinctrl-1:
> > +    description: Suspend pinctrls
>
> I think the pinctrl should go in the DSI controller node, not the
> display unless it is settings for 'reset-gpios'.
Yes, from the downstream code, this seems to be for reset-gpios.

>
> > +
> > +  ports:
> > +    type: object
> > +    properties:
> > +      port@0:
> > +        type: object
> > +        description: DSI input port driven by master DSI
> > +        properties:
> > +          reg:
> > +            const: 0
> > +
> > +        required:
> > +          - reg
>
> For a single port, you can do just 'port' (without ports node).
Thanks; will update in next version.
>
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - vddi0-supply
> > +  - vddpos-supply
> > +  - vddneg-supply
> > +  - reset-gpios
> > +  - pinctrl-names
> > +  - pinctrl-0
> > +  - pinctrl-1
> > +  - ports
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > +  - |+
> > +    #include <dt-bindings/gpio/gpio.h>
> > +    dsi0 {
>
> dsi {
>
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +
> > +      panel@0 {
> > +        compatible = "tianma,nt36672a";
> > +        reg = <0>;
> > +        vddi0-supply = <&vreg_l14a_1p88>;
> > +        vddpos-supply = <&lab>;
> > +        vddneg-supply = <&ibb>;
> > +
> > +        reset-gpios = <&tlmm 6 GPIO_ACTIVE_HIGH>;
> > +
> > +        pinctrl-names = "panel_active", "panel_suspend";
> > +        pinctrl-0 = <&sde_dsi_active>;
> > +        pinctrl-1 = <&sde_dsi_suspend>;
> > +
> > +        ports {
> > +          #address-cells = <1>;
> > +          #size-cells = <0>;
> > +
> > +          port@0 {
> > +            reg = <0>;
> > +            tianma_nt36672a_in_0: endpoint {
> > +              remote-endpoint = <&dsi0_out>;
> > +            };
> > +          };
> > +        };
> > +      };
> > +    };
> > +
> > +...
> > --
> > 2.27.0
> >

Best,
Sumit.