linux-kernel - Re: [PATCH 1/4] arm64: dts: qcom: sc8280xp: rename i2c5 to i2c21

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Message-ID: <Y5iYAAdkJVfLrITf@hovoldconsulting.com>
Date:   Tue, 13 Dec 2022 16:19:28 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Shazad Hussain <quic_shazhuss@...cinc.com>
Cc:     Brian Masney <bmasney@...hat.com>, andersson@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, konrad.dybcio@...aro.org,
        robh+dt@...nel.org, johan+linaro@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, ahalaney@...hat.com,
        echanude@...hat.com
Subject: Re: [PATCH 1/4] arm64: dts: qcom: sc8280xp: rename i2c5 to i2c21

On Tue, Dec 13, 2022 at 08:34:56PM +0530, Shazad Hussain wrote:
> 
> 
> On 12/13/2022 8:24 PM, Johan Hovold wrote:
> > On Mon, Dec 12, 2022 at 01:23:11PM -0500, Brian Masney wrote:
> >> According to the downstream 5.4 kernel sources for the sa8540p,
> >> i2c@...000 is labeled i2c bus 21, not 5. The interrupts and clocks
> >> also match. Let's go ahead and correct the name that's used in the
> >> three files where this is listed.
> >>
> >> Signed-off-by: Brian Masney <bmasney@...hat.com>
> >> Fixes: 152d1faf1e2f3 ("arm64: dts: qcom: add SC8280XP platform")
> >> Fixes: ccd3517faf183 ("arm64: dts: qcom: sc8280xp: Add reference device")
> >> Fixes: 32c231385ed43 ("arm64: dts: qcom: sc8280xp: add Lenovo Thinkpad X13s devicetree")
> > 
> >> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> >> index 109c9d2b684d..875cc91324ce 100644
> >> --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> >> +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
> >> @@ -827,7 +827,7 @@ qup2_uart17: serial@...000 {
> >>   				status = "disabled";
> >>   			};
> >>   
> >> -			qup2_i2c5: i2c@...000 {
> >> +			qup2_i2c21: i2c@...000 {
> > 
> > Note that the node is labelled qup2_i2c5 and not qup_i2c5.
> > 
> > That is, the QUP nodes are labelled using two indices, and specifically
> > 
> > 	qup2_i2c5
> > 
> > would be another name for
> > 
> > 	qup_i2c21
> > 
> > if we'd been using such a flat naming scheme (there are 8 engines per
> > QUP).
> > 
> > So there's nothing wrong with how these nodes are currently named, but
> > mixing the two scheme as you are suggesting would not be correct.
> 
> Wondering we might need to change qup2_uart17 to qup2_uart1 then ?

Right, I just noticed that too.

Johan