[Cc += Arnd, Andy who did similar changes in the past]
Hello,
On Wed, Jul 26, 2023 at 06:06:26PM +0800, Zhu Wang wrote:
> When building with W=1, the following warning occurs.
>
> drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c:48:17: warning: ‘anx781x_i2c_addresses’ defined but not used [-Wunused-const-variable=]
> static const u8 anx781x_i2c_addresses[] = {
> ^~~~~~~~~~~~~~~~~~~~~
> drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c:40:17: warning: ‘anx7808_i2c_addresses’ defined but not used [-Wunused-const-variable=]
> static const u8 anx7808_i2c_addresses[] = {
>
> The definition of above two data variables is included by the
> macro CONFIG_OF, so we also include the data variable
> definitions in the macro CONFIG_OF. And in addition the data
> variable anx78xx_match_table is included in the macro CONFIG_OF,
> so we add CONFIG_OF to the place where it is used.
>
> Fixes: 5d97408e0d70 ("drm/bridge: move ANA78xx driver to analogix subdirectory")
>
> Signed-off-by: Zhu Wang <wangzhu9@xxxxxxxxxx>
> ---
> drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
> index 06a3e3243e19..799b33cebdd5 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c
> @@ -37,6 +37,7 @@
>
> #define XTAL_CLK 270 /* 27M */
>
> +#if IS_ENABLED(CONFIG_OF)
> static const u8 anx7808_i2c_addresses[] = {
> [I2C_IDX_TX_P0] = 0x78,
> [I2C_IDX_TX_P1] = 0x7a,
> @@ -52,6 +53,7 @@ static const u8 anx781x_i2c_addresses[] = {
> [I2C_IDX_RX_P0] = 0x7e,
> [I2C_IDX_RX_P1] = 0x80,
> };
> +#endif
You can mark anx7808_i2c_addresses with __maybe_unused, then the #if
isn't needed.
> struct anx78xx_platform_data {
> struct regulator *dvdd10;
> @@ -1387,7 +1389,9 @@ MODULE_DEVICE_TABLE(of, anx78xx_match_table);
> static struct i2c_driver anx78xx_driver = {
> .driver = {
> .name = "anx7814",
> +#if IS_ENABLED(CONFIG_OF)
> .of_match_table = of_match_ptr(anx78xx_match_table),
> +#endif
If CONFIG_OF is disabled of_match_ptr(something) evaluates to NULL, so
you can drop the #if here.
Having said that the better fix is probably to just do
.of_match_table = anx78xx_match_table,
as systems using ACPI can benefit from the of_match_table, too.
See b89a9e9890d4 ("gpio: aggregator: Remove CONFIG_OF and of_match_ptr()
protections") for an example.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
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