linux-kernel - [PATCH 2/3] pinctrl: single: Allow probe to continue if mem region busy

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Message-ID: <20251222-upstream_pinctrl_single-v1-2-e4aaa4eeb936@aspeedtech.com>
Date: Mon, 22 Dec 2025 20:04:27 +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 2/3] pinctrl: single: Allow probe to continue if mem region
 busy

Skip exclusive memory region reservation failure during probe and
continue initialization with a warning. This enables support for
systems where the memory region may already be reserved, improving
probe robustness.

Signed-off-by: Billy Tsai <billy_tsai@...eedtech.com>
---
 drivers/pinctrl/pinctrl-single.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index 757c22cc09f3..e65ae737b4c5 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -1910,13 +1910,13 @@ static int pcs_probe(struct platform_device *pdev)
 
 	pcs->res = devm_request_mem_region(pcs->dev, res->start,
 			resource_size(res), DRIVER_NAME);
-	if (!pcs->res) {
-		dev_err(pcs->dev, "could not get mem_region\n");
-		return -EBUSY;
-	}
+	if (!pcs->res)
+		dev_warn(pcs->dev, "mem_region busy, continuing without reservation\n");
+	else
+		res = pcs->res;
 
-	pcs->size = resource_size(pcs->res);
-	pcs->base = devm_ioremap(pcs->dev, pcs->res->start, pcs->size);
+	pcs->size = resource_size(res);
+	pcs->base = devm_ioremap(pcs->dev, res->start, pcs->size);
 	if (!pcs->base) {
 		dev_err(pcs->dev, "could not ioremap\n");
 		return -ENODEV;

-- 
2.34.1