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: <quqkqv4eer7tmubvsqkbuwammqaa5qqxojedsh42ryax3laah7@v7khc2cq4eti>
Date: Mon, 22 Jan 2024 16:15:47 +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 15:59:37, AngeloGioacchino Del Regno wrote:
> Il 22/01/24 14:49, Marijn Suijten ha scritto:
> > 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?)
> > 
> 
> I meant to add it to both, sorry.
> 
> In any case, take the typo'ed example as a simplification of your first version :-)

Okay, I'll resend a version that creates a new pinctrl node and applies it to both cases.

Unfortunately I can no longer test and confirm that it makes a difference
to have the card-detect IRQ always biased, even while the SDHCI controller
is "asleep" or off, so I'll trust your word for it.  If I remember correctly
downstream turns it off as well?

- Marijn