linux-kernel - Re: Re: [PATCH v2 6/6] arm64: dts: qcom: msm8956-loire: Add SD Card Detect to SDC2 pin states

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Message-ID: <iatieesr52v5au4kkovw3gc34tn3snt454grq7le66oar6x7t4@4jfwxgxov36v>
Date: Mon, 22 Jan 2024 14:49:01 +0100
From: Marijn Suijten <marijn.suijten@...ainline.org>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Bjorn Andersson <andersson@...nel.org>, 
	Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Conor Dooley <conor+dt@...nel.org>, ~postmarketos/upstreaming@...ts.sr.ht, 
	Luca Weiss <luca@...tu.xyz>, Adam Skladowski <a39.skl@...il.com>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Martin Botka <martin.botka@...ainline.org>, 
	Jami Kettunen <jami.kettunen@...ainline.org>, linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH v2 6/6] arm64: dts: qcom: msm8956-loire: Add SD Card
 Detect to SDC2 pin states

On 2024-01-22 12:48:27, AngeloGioacchino Del Regno wrote:
> Il 21/01/24 23:33, Marijn Suijten ha scritto:
> > In addition to the SDC2 pins, set the SD Card Detect pin in a sane state
> > to be used as an interrupt when an SD Card is slotted in or removed.
> > 
> > Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> > ---
> >   arch/arm64/boot/dts/qcom/msm8956-sony-xperia-loire.dtsi | 17 +++++++++++++++++
> >   1 file changed, 17 insertions(+)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/msm8956-sony-xperia-loire.dtsi b/arch/arm64/boot/dts/qcom/msm8956-sony-xperia-loire.dtsi
> > index b0b83edd3627..75412e37334c 100644
> > --- a/arch/arm64/boot/dts/qcom/msm8956-sony-xperia-loire.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/msm8956-sony-xperia-loire.dtsi
> > @@ -264,10 +264,27 @@ &sdhc_1 {
> >   	status = "okay";
> >   };
> >   
> > +&sdc2_off_state {
> > +	sd-cd-pins {
> > +		pins = "gpio100";
> > +		function = "gpio";
> > +		drive-strength = <2>;
> > +		bias-disable;
> > +	};
> 
> Are you sure that you really don't want card detect during system suspend?

Does it make a difference if the rest of pinctrl and the SDHCI controller are
also turned off?

> You could simply add a sdc2-cd-pins out of sdc2_{on,off}_state and add use it for
> both default and sleep.

This sounds close to what Konrad suggested by using a new block wit its own
label rather than extending the existing state.

> pinctrl-0 = <&sdc2_on_state>, <&sdc2_card_det_n>;
> pinctrl-1 = <&sdc2_off_state>;

You said both, but it's not in pinctrl-1 here?  (And might unselect bias-pull-up
implicitly instead of explicitly selecting bias-disable via an off node?)

- Marijn

> Cheers,
> Angelo
> 
> > +};
> > +
> >   &sdc2_on_state {
> >   	clk-pins {
> >   		drive-strength = <10>;
> >   	};
> > +
> > +	sd-cd-pins {
> > +		pins = "gpio100";
> > +		function = "gpio";
> > +		drive-strength = <2>;
> > +		input-enable;
> > +		bias-pull-up;
> > +	};
> >   };
> >   
> >   &sdhc_2 {
> > 
> 
>