linux-kernel - [PATCH 3/3] i2c: rcar: Fix Wvoid-pointer-to-enum-cast warning

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Message-ID: <20251126182257.157439-6-krzysztof.kozlowski@oss.qualcomm.com>
Date: Wed, 26 Nov 2025 19:23:00 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
To: Andi Shyti <andi.shyti@...nel.org>, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
        Bill Wendling <morbo@...gle.com>,
        Justin Stitt <justinstitt@...gle.com>, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, llvm@...ts.linux.dev
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
Subject: [PATCH 3/3] i2c: rcar: Fix Wvoid-pointer-to-enum-cast warning

'i2c_types' is an enum, thus cast of pointer on 64-bit compile test with
clang and W=1 causes:

  i2c-rcar.c:1144:18: error: cast to smaller integer type 'enum rcar_i2c_type' from 'const void *' [-Werror,-Wvoid-pointer-to-enum-cast]

One of the discussions in 2023 on LKML suggested warning is not suitable
for kernel.  Nothing changed in this regard since that time, so assume
the warning will stay and we want to have warnings-free builds.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@....qualcomm.com>
---
 drivers/i2c/busses/i2c-rcar.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index d51884ab99f4..5ce8f8e4856f 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -1141,7 +1141,7 @@ static int rcar_i2c_probe(struct platform_device *pdev)
 	if (IS_ERR(priv->io))
 		return PTR_ERR(priv->io);
 
-	priv->devtype = (enum rcar_i2c_type)of_device_get_match_data(dev);
+	priv->devtype = (kernel_ulong_t)of_device_get_match_data(dev);
 	init_waitqueue_head(&priv->wait);
 
 	adap = &priv->adap;
-- 
2.48.1