linux-kernel - Re: [PATCH 07/34] Input: stmpe-ts - mark OF related data as maybe unused

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Date: Wed, 3 Apr 2024 15:17:21 +0200
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Arnd Bergmann <arnd@...nel.org>
Cc: linux-kernel@...r.kernel.org, 
	Dmitry Torokhov <dmitry.torokhov@...il.com>, Maxime Coquelin <mcoquelin.stm32@...il.com>, 
	Alexandre Torgue <alexandre.torgue@...s.st.com>, Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
	Arnd Bergmann <arnd@...db.de>, linux-input@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 07/34] Input: stmpe-ts - mark OF related data as maybe
 unused

Hello,

On Wed, Apr 03, 2024 at 10:06:25AM +0200, Arnd Bergmann wrote:
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> 
> When compile tested with W=1 on x86_64 with driver as built-in:
> 
>   stmpe-ts.c:371:34: error: unused variable 'stmpe_ts_ids' [-Werror,-Wunused-const-variable]
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/input/touchscreen/stmpe-ts.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/touchscreen/stmpe-ts.c b/drivers/input/touchscreen/stmpe-ts.c
> index b204fdb2d22c..022b3e94266d 100644
> --- a/drivers/input/touchscreen/stmpe-ts.c
> +++ b/drivers/input/touchscreen/stmpe-ts.c
> @@ -366,7 +366,7 @@ static struct platform_driver stmpe_ts_driver = {
>  };
>  module_platform_driver(stmpe_ts_driver);
>  
> -static const struct of_device_id stmpe_ts_ids[] = {
> +static const struct of_device_id stmpe_ts_ids[] __maybe_unused = {
>  	{ .compatible = "st,stmpe-ts", },
>  	{ },
>  };

I'd suggest the following instead:

diff --git a/drivers/input/touchscreen/stmpe-ts.c b/drivers/input/touchscreen/stmpe-ts.c
index b204fdb2d22c..e1afebc641ec 100644
--- a/drivers/input/touchscreen/stmpe-ts.c
+++ b/drivers/input/touchscreen/stmpe-ts.c
@@ -357,21 +357,22 @@ static void stmpe_ts_remove(struct platform_device *pdev)
 	stmpe_disable(ts->stmpe, STMPE_BLOCK_TOUCHSCREEN);
 }
 
-static struct platform_driver stmpe_ts_driver = {
-	.driver = {
-		.name = STMPE_TS_NAME,
-	},
-	.probe = stmpe_input_probe,
-	.remove_new = stmpe_ts_remove,
-};
-module_platform_driver(stmpe_ts_driver);
-
 static const struct of_device_id stmpe_ts_ids[] = {
 	{ .compatible = "st,stmpe-ts", },
 	{ },
 };
 MODULE_DEVICE_TABLE(of, stmpe_ts_ids);
 
+static struct platform_driver stmpe_ts_driver = {
+	.driver = {
+		.name = STMPE_TS_NAME,
+		.of_match_table = stmpe_ts_ids,
+	},
+	.probe = stmpe_input_probe,
+	.remove_new = stmpe_ts_remove,
+};
+module_platform_driver(stmpe_ts_driver);
+
 MODULE_AUTHOR("Luotao Fu <l.fu@...gutronix.de>");
 MODULE_DESCRIPTION("STMPEXXX touchscreen driver");
 MODULE_LICENSE("GPL");

I wonder if with the status quo binding via dt works at all with
stmpe_ts_driver.driver.of_match_table unset?!

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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