linux-kernel - [PATCH 0/3] pinctrl: single: bit-per-mux DT flexibility, probe robustness, and consistent pinconf offsets

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Message-ID: <20251222-upstream_pinctrl_single-v1-0-e4aaa4eeb936@aspeedtech.com>
Date: Mon, 22 Dec 2025 20:04:25 +0800
From: Billy Tsai <billy_tsai@...eedtech.com>
To: Tony Lindgren <tony@...mide.com>, Haojian Zhuang
	<haojian.zhuang@...aro.org>, Linus Walleij <linusw@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-omap@...r.kernel.org>,
	<linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<andrew@...econstruct.com.au>, <BMC-SW@...eedtech.com>, Billy Tsai
	<billy_tsai@...eedtech.com>
Subject: [PATCH 0/3] pinctrl: single: bit-per-mux DT flexibility, probe
 robustness, and consistent pinconf offsets

This series updates pinctrl-single to behave more predictably on
bit-per-mux platforms by making its DT interface more flexible, its probe
path more tolerant of pre-reserved resources, and its pin configuration
register addressing consistent with pinmux.
It extends the driver to accept a per-pin <pin_index func_sel> style
description for bit-per-mux users while keeping the existing
pinctrl-single,bits binding as the preferred input when available. It also
relaxes probe failure when the I/O memory region cannot be reserved
exclusively, allowing initialization to proceed with a warning on systems
where that region is already reserved. Finally, it aligns pinconf register
offset computation with the pinmux logic so that both muxing and pin
configuration access the same register offsets, avoiding incorrect pinconf
operations on bit-per-mux configurations.

Signed-off-by: Billy Tsai <billy_tsai@...eedtech.com>
---
Billy Tsai (3):
      pinctrl: single: add per-pin binding support for bit-per-mux
      pinctrl: single: Allow probe to continue if mem region busy
      pinctrl: single: unify pinconf offset mapping with pinmux

 drivers/pinctrl/pinctrl-single.c | 150 ++++++++++++++++++++++++++++-----------
 1 file changed, 110 insertions(+), 40 deletions(-)
---
base-commit: dd9b004b7ff3289fb7bae35130c0a5c0537266af
change-id: 20251222-upstream_pinctrl_single-99e8df1fe2b9

Best regards,
-- 
Billy Tsai <billy_tsai@...eedtech.com>