linux-hardening - Re: [PATCH 4/6] arm64: dts: qcom: sm6125-xiaomi-ginkgo: Fix reserved gpio ranges

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Message-ID: <20260113141342.11057-1-nathbappai@gmail.com>
Date: Tue, 13 Jan 2026 14:13:36 +0000
From: Biswapriyo Nath <nathbappai@...il.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Cc: Biswapriyo Nath <nathbappai@...il.com>,
	barnabas.czeman@...nlining.org,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Gabriel Gonzales <semfault@...root.org>,
	Kees Cook <kees@...nel.org>,
	Tony Luck <tony.luck@...el.com>,
	"Guilherme G. Piccoli" <gpiccoli@...lia.com>,
	linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	phone-devel@...r.kernel.org,
	~postmarketos/upstreaming@...ts.sr.ht,
	linux@...nlining.org
Subject: Re: [PATCH 4/6] arm64: dts: qcom: sm6125-xiaomi-ginkgo: Fix reserved gpio ranges

On Tue, 13 Jan 2026 10:45:02 +0100 Konrad Dybcio <konrad.dybcio@....qualcomm.com> wrote:

> I was referring to the NFC eSE (embedded Secure Element) which usually
> has a separate connection to the SoC

Yes, gpio 0-4 are connected to NFC eSE and gpio 30-34 are for
fingerprint scanner. Here is the list of reserved gpio and their
functions according to the device's schematic.

0 - ESE_SPI_MISO
1 - ESE_SPI_MOSI
2 - ESE_SPI_SCLK
3 - ESE_SPI_CS_N

30 - FP_SPI_MISO
31 - FP_SPI_MOSI
32 - FP_SPI_SCLK
33 - FP_SPI_CS_N

Though Redmi Note 8 does not have NFC, kernel crashes if 0-4 gpios
are not reserved.

Tested-by: Biswapriyo Nath <nathbappai@...il.com>

Thanks.