linux-kernel - Re: [PATCH v2 2/4] media: dt-bindings: Add OmniVision OV08X40

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Message-ID: <95d7d695-89d2-4c1d-99f6-4f9a687f7d13@linaro.org>
Date: Tue, 1 Oct 2024 14:47:43 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: Jason Chen <jason.z.chen@...el.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Sergey Senozhatsky <senozhatsky@...omium.org>,
 Hans Verkuil <hverkuil-cisco@...all.nl>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, linux-media@...r.kernel.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v2 2/4] media: dt-bindings: Add OmniVision OV08X40

On 01/10/2024 14:22, Sakari Ailus wrote:
>> +  assigned-clocks: true
>> +  assigned-clock-parents: true
>> +  assigned-clock-rates: true
> As much as I'd like to see these mandatory, there seem to be cases where
> they can't be used. Therefore I'd leave them in the example only.
> 
> If that turns out to be the only change to do, I can also handle that while
> applying.

So I took Documentation/devicetree/bindings/media/i2c/ovti,ov9282.yaml 
as the reference for this.

Without listing "assigned-clock*" in the required: field I believe the 
dts checkers will not require those.

So instead of saying
assigned-clocks:
     maxItems: 1

we write
assigned-clocks: true

omit from "required:" and get the desired effect.

For example this passes the checker for me.

&cci1_i2c1 {
         camera@36 {
                 compatible = "ovti,ov08x40";
                 reg = <0x36>;

                 reset-gpios = <&tlmm 237 GPIO_ACTIVE_LOW>;
                 pinctrl-names = "default";
                 pinctrl-0 = <&cam_rgb_default>;

                 clocks = <&camcc CAM_CC_MCLK4_CLK>;
                 assigned-clocks = <&camcc CAM_CC_MCLK4_CLK>;
                 assigned-clock-rates = <19200000>;

                 orientation = <0>; /* front facing */

                 avdd-supply = <&vreg_l7b_2p8>;
                 dvdd-supply = <&vreg_l7b_2p8>;
                 dovdd-supply = <&vreg_l3m_1p8>;

                 port {
                         ov08x40_ep: endpoint {
                                 clock-lanes = <0>;
                                 data-lanes = <1 2 3 4>;
                                 link-frequencies = /bits/ 64 <400000000>;
                                 remote-endpoint = <&csiphy4_ep>;
                         };
                 };
         };
};

Eh.. at least that's how I think this works.

Krzysztof/Rob ?

---
bod