linux-kernel - RE: [PATCH 1/3] dt-bindings: pwm: tegra: Add compatible string for Tegra234

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Date:   Fri, 9 Sep 2022 11:17:56 +0000
From:   Sandipan Patra <spatra@...dia.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Bibek Basu <bbasu@...dia.com>,
        Krishna Yarlagadda <kyarlagadda@...dia.com>
Subject: RE: [PATCH 1/3] dt-bindings: pwm: tegra: Add compatible string for
 Tegra234


> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: Thursday, September 8, 2022 5:44 PM
> To: Sandipan Patra <spatra@...dia.com>; thierry.reding@...il.com;
> Jonathan Hunter <jonathanh@...dia.com>; robh+dt@...nel.org;
> krzysztof.kozlowski+dt@...aro.org; devicetree@...r.kernel.org; linux-
> tegra@...r.kernel.org; linux-kernel@...r.kernel.org
> Cc: Bibek Basu <bbasu@...dia.com>; Krishna Yarlagadda
> <kyarlagadda@...dia.com>
> Subject: Re: [PATCH 1/3] dt-bindings: pwm: tegra: Add compatible string for
> Tegra234
> 
> External email: Use caution opening links or attachments
> 
> 
> On 07/09/2022 08:25, Sandipan Patra wrote:
> > Tegra234 has 8 different PWM controllers and each controller has only
> > one output. Add a device tree compatible string for Tegra234.
> >
> > Signed-off-by: Sandipan Patra <spatra@...dia.com>
> > ---
> >  Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git
> > a/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt
> > b/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt
> > index 74c41e34c3b6..331c1e66e8fa 100644
> > --- a/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt
> > +++ b/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt
> > @@ -9,7 +9,7 @@ Required properties:
> >    - "nvidia,tegra132-pwm", "nvidia,tegra20-pwm": for Tegra132
> >    - "nvidia,tegra210-pwm", "nvidia,tegra20-pwm": for Tegra210
> >    - "nvidia,tegra186-pwm": for Tegra186
> > -  - "nvidia,tegra194-pwm": for Tegra194
> > +  - "nvidia,tegra194-pwm": for Tegra194, Tegra234
> 
> The commit msg suggest it is different. Are you sure they are exactly the
> same? If not the same, but compatible, you should use fallback.

Tegra194 and Tegra234 are 2 different chips using exactly same pwm module and dt node.
This change is to convey that same compatible is used for Tegra234 as well.

Thanks & Regards,
Sandipan
> 
> Best regards,
> Krzysztof