linux-kernel - Re: [PATCH 09/13] pinctrl: qcom: spmi-gpio: drop broken pm8008 support

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Date: Wed, 8 May 2024 15:06:41 -0700
From: Stephen Boyd <swboyd@...omium.org>
To: Bjorn Andersson <andersson@...nel.org>, Johan Hovold <johan+linaro@...nel.org>, 
	Lee Jones <lee@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, 
	Mark Brown <broonie@...nel.org>
Cc: Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Liam Girdwood <lgirdwood@...il.com>, Das Srinagesh <quic_gurus@...cinc.com>, 
	Satya Priya <quic_c_skakit@...cinc.com>, linux-arm-msm@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-gpio@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 09/13] pinctrl: qcom: spmi-gpio: drop broken pm8008 support

Quoting Johan Hovold (2024-05-06 08:08:26)
> The SPMI GPIO driver assumes that the parent device is an SPMI device
> and accesses random data when backcasting the parent struct device
> pointer for non-SPMI devices.
>
> Fortunately this does not seem to cause any issues currently when the
> parent device is an I2C client like the PM8008, but this could change if
> the structures are reorganised (e.g. using structure randomisation).
>
> Notably the interrupt implementation is also broken for non-SPMI devices.
>
> Also note that the two GPIO pins on PM8008 are used for interrupts and
> reset so their practical use should be limited.
>
> Drop the broken GPIO support for PM8008 for now.
>
> Fixes: ea119e5a482a ("pinctrl: qcom-pmic-gpio: Add support for pm8008")
> Cc: stable@...r.kernel.org      # 5.13
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>