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

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Message-ID: <48946c81-dad0-4e2d-9569-5fbac1675bb6@collabora.com>
Date: Mon, 22 Jan 2024 15:59:37 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Marijn Suijten <marijn.suijten@...ainline.org>
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: [PATCH v2 6/6] arm64: dts: qcom: msm8956-loire: Add SD Card
 Detect to SDC2 pin states

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 :-)


> - 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 {
>>>
>>
>>