linux-kernel - [PATCH] pinctrl: intel: Document Tiger Lake reuse on some Alder Lake platforms

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Message-ID: <20250428235610.11324-1-ariel@simulevski.at>
Date: Tue, 29 Apr 2025 01:56:10 +0200
From: Ariel Simulevski <ariel@...ulevski.at>
To: andy@...nel.org
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Ariel Simulevski <ariel@...ulevski.at>
Subject: [PATCH] pinctrl: intel: Document Tiger Lake reuse on some Alder Lake platforms

Some Alder Lake systems, such as those using the PixArt I2C touchpad (PIXA3848),
reuse GPIO IP blocks similar to Tiger Lake. As a result, enabling
CONFIG_PINCTRL_TIGERLAKE may be required for proper I2C device detection.

Document this in the Kconfig help text to assist users encountering this issue.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=220056
Signed-off-by: Ariel Simulevski <ariel@...ulevski.at>
---
 drivers/pinctrl/intel/Kconfig | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pinctrl/intel/Kconfig b/drivers/pinctrl/intel/Kconfig
index 248c2e558ff3..b8e1436b04f7 100644
--- a/drivers/pinctrl/intel/Kconfig
+++ b/drivers/pinctrl/intel/Kconfig
@@ -54,6 +54,11 @@ config PINCTRL_ALDERLAKE
 	  This pinctrl driver provides an interface that allows configuring
 	  of Intel Alder Lake PCH pins and using them as GPIOs.
 
+	  Note: On some Alder Lake platforms, including systems with
+	  the PixArt I2C touchpad (PIXA3848), the hardware reuses
+	  Tiger Lake style GPIO blocks. For proper device detection,
+	  enabling CONFIG_PINCTRL_TIGERLAKE may be necessary.
+
 config PINCTRL_BROXTON
 	tristate "Intel Broxton pinctrl and GPIO driver"
 	select PINCTRL_INTEL
-- 
2.49.0