linux-kernel - Re: [PATCH 4/4] ARM: dts: qcom: msm8974: Add device tree for Samsung Galaxy S5 China

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Message-ID: <9b1c28415b5e3a5d94d167612fc0b7e0f9d0a767.camel@rong.moe>
Date: Mon, 22 Jan 2024 22:51:35 +0800
From: Rong Zhang <i@...g.moe>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, Bjorn Andersson
 <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, Rob
 Herring <robh+dt@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>,  Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Icenowy Zheng <uwu@...nowy.me>
Subject: Re: [PATCH 4/4] ARM: dts: qcom: msm8974: Add device tree for
 Samsung Galaxy S5 China

On Mon, 2024-01-22 at 10:48 +0100, Krzysztof Kozlowski wrote:
> On 21/01/2024 16:39, Rong Zhang wrote:
> > This device has little difference compared to Samsung Galaxy S5 (klte),
> > so the device tree is based on qcom-msm8974pro-samsung-klte.dts. The
> > only difference is the gpio pins of i2c_led_gpio. With pins corrected,
> > the LEDs and WiFi are able to work properly.
> > 
> > Signed-off-by: Rong Zhang <i@...g.moe>
> 
> 
> > diff --git a/arch/arm/boot/dts/qcom/qcom-msm8974pro-samsung-kltechn.dts b/arch/arm/boot/dts/qcom/qcom-msm8974pro-samsung-kltechn.dts
> > new file mode 100644
> > index 000000000000..5a8d59ea4439
> > --- /dev/null
> > +++ b/arch/arm/boot/dts/qcom/qcom-msm8974pro-samsung-kltechn.dts
> > @@ -0,0 +1,16 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +#include "qcom-msm8974pro-samsung-klte.dts"
> > +
> > +/ {
> > +	model = "Samsung Galaxy S5 China";
> > +	compatible = "samsung,kltechn", "samsung,klte", "qcom,msm8974pro", "qcom,msm8974";
> 
> That's not what you said in the binding.
> 
> It does not look like you tested the DTS against bindings. Please run
> `make dtbs_check W=1` (see
> Documentation/devicetree/bindings/writing-schema.rst or
> https://www.linaro.org/blog/tips-and-tricks-for-validating-devicetree-sources-with-the-devicetree-schema/
> for instructions).

Oops, I've forgot to run dtbs_check again after my final decision of
adding "samsung,klte". Thanks for pointing it out.

I added it because I thought the difference between klte and kltechn is
so tiny and I've seen some other dts doing that.

I've glanced similar dts. To solve this, I think we could either:
1. keep the dt-binding in [PATCH 3/4], and delete "samsung,klte" here
2. rewrite dt-binding like crystalfontz,cfa100{36,37,49,55,56,57,58}:

diff --git a/Documentation/devicetree/bindings/arm/qcom.yaml b/Documentation/devicetree/bindings/arm/qcom.yaml
index 2bd29a2399ad..4979ccae2b64 100644
--- a/Documentation/devicetree/bindings/arm/qcom.yaml
+++ b/Documentation/devicetree/bindings/arm/qcom.yaml
@@ -223,11 +223,17 @@ properties:
               - fairphone,fp2
               - oneplus,bacon
               - samsung,klte
-              - samsung,kltechn
               - sony,xperia-castor
           - const: qcom,msm8974pro
           - const: qcom,msm8974
 
+      - items:
+          - enum:
+              - samsung,kltechn
+          - const: samsung,klte
+          - const: qcom,msm8974pro
+          - const: qcom,msm8974
+
       - items:
           - const: qcom,msm8916-mtp
           - const: qcom,msm8916-mtp/1

My preference is (2.) since other variants of klte may be added in the
future. I would like to hear your preferences.

Thanks,
Rong


> Best regards,
> Krzysztof
>