linux-kernel - [PATCH] mfd: syscon: Use of_io_request_and

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Date:   Mon, 20 Mar 2023 16:23:19 +0100
From:   Loic Poulain <loic.poulain@...aro.org>
To:     lee@...nel.org, arnd@...db.de
Cc:     linux-kernel@...r.kernel.org,
        Loic Poulain <loic.poulain@...aro.org>
Subject: [PATCH] mfd: syscon: Use of_io_request_and_map() for IO mapping

Use of_io_request_and_map() instead of of_iomap() so that the
region is reserved and protected, i.e reported in /proc/iomem
and not accessible from user side (CONFIG_IO_STRICT_DEVMEM).

Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
---
 drivers/mfd/syscon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index bdb2ce7ff03b..7e6d4edda118 100644
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -60,7 +60,7 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_clk)
 		goto err_map;
 	}
 
-	base = of_iomap(np, 0);
+	base = of_io_request_and_map(np, 0, NULL);
 	if (!base) {
 		ret = -ENOMEM;
 		goto err_map;
-- 
2.34.1