linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: sm8650-mtp: add gpio74 as reserved gpio

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Date: Thu, 11 Jan 2024 20:39:55 +0200
From: Georgi Djakov <quic_c_gdjako@...cinc.com>
To: Neil Armstrong <neil.armstrong@...aro.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring
	<robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Georgi Djakov <djakov@...nel.org>
Subject: Re: [PATCH 2/2] arm64: dts: qcom: sm8650-mtp: add gpio74 as reserved
 gpio

On 1/11/2024 6:58 PM, Neil Armstrong wrote:
> The TLMM gpio74 is also used to communicate with the secure NFC
> on-board module, some variants of the SM8650-MTP board requires
> this GPIO to be dedicated to the secure firmware and set reserved
> in order to successfully initialize the TLMM GPIOs from HLOS (Linux).
> On the other boards this GPIO is unused so it's still safe to mark
> the GPIO as reserved.
> 
> Fixes: 6fbdb3c1fac7 ("arm64: dts: qcom: sm8650: add initial SM8650 MTP dts")
> Reported-by: Georgi Djakov <djakov@...nel.org>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>

The SM8650-MTP board boots successfully with this patch. Thanks Neil!

Tested-by: Georgi Djakov <quic_c_gdjako@...cinc.com>

> ---
>  arch/arm64/boot/dts/qcom/sm8650-mtp.dts | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sm8650-mtp.dts b/arch/arm64/boot/dts/qcom/sm8650-mtp.dts
> index 9d916edb1c73..be133a3d5cbe 100644
> --- a/arch/arm64/boot/dts/qcom/sm8650-mtp.dts
> +++ b/arch/arm64/boot/dts/qcom/sm8650-mtp.dts
> @@ -622,7 +622,7 @@ right_spkr: speaker@0,1 {
>  
>  &tlmm {
>  	/* Reserved I/Os for NFC */
> -	gpio-reserved-ranges = <32 8>;
> +	gpio-reserved-ranges = <32 8>, <74 1>;
>  
>  	disp0_reset_n_active: disp0-reset-n-active-state {
>  		pins = "gpio133";
>