linux-kernel - Re: [PATCH 7/7] dt-bindings: pinctrl: qcom: correct gpio-ranges in examples

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Message-ID: <Y9qT3vNTcuT+njIR@gerhold.net>
Date:   Wed, 1 Feb 2023 17:31:26 +0100
From:   Stephan Gerhold <stephan@...hold.net>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Richard Acayan <mailingradian@...il.com>,
        Vinod Koul <vkoul@...nel.org>,
        krishna Lanka <quic_vamslank@...cinc.com>,
        Iskren Chernev <me@...ren.info>,
        Martin Botka <martin.botka@...ainline.org>,
        Abel Vesa <abel.vesa@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] dt-bindings: pinctrl: qcom: correct gpio-ranges in
 examples

On Wed, Feb 01, 2023 at 05:07:40PM +0100, Stephan Gerhold wrote:
> On Wed, Feb 01, 2023 at 04:30:19PM +0100, Krzysztof Kozlowski wrote:
> > Correct the number of GPIOs in gpio-ranges to match reality.
> > 
> > Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> AFAICT the current gpio-ranges do match the number of GPIOs (ngpios) in
> the pinctrl drivers for all/most of the platforms you update below. It
> looks like the special UFS_RESET pins are also exported as GPIOs in
> addition to the real GPIOs. I'm not sure if this is intended or a
> mistake.
> 

It looks like this is on purpose:

---
>From 53a5372ce326116f3e3d3f1d701113b2542509f4 Mon Sep 17 00:00:00 2001
From: Bjorn Andersson <bjorn.andersson@...aro.org>
Date: Tue, 4 Jun 2019 00:19:59 -0700
Subject: [PATCH] pinctrl: qcom: sdm845: Expose ufs_reset as gpio

The ufs_reset pin is expected to be wired to the reset pin of the
primary UFS memory but is pretty much just a general purpose output pinr

Reorder the pins and expose it as gpio 150, so that the UFS driver can
toggle it.
---

And it's used in sdm845-mtp.dts:

&ufs_mem_hc {
	reset-gpios = <&tlmm 150 GPIO_ACTIVE_LOW>;
};

So I think this patch (together with the DT ones you sent) should be
dropped because it would prevent using the UFS_RESET as GPIO since it's
no longer included in gpio-ranges.

Thanks,
Stephan