Re: [PATCH v2 1/2] ASoC: meson: aiu: fix function pointer type mismatch

Hi,

On Tue, Feb 13, 2024 at 10:58:03PM +0100, Jerome Brunet wrote:

clang-16 warns about casting functions to incompatible types, as is done here to call clk_disable_unprepare:

sound/soc/meson/aiu.c:243:12: error: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict] 243 | (void(*)(void *))clk_disable_unprepare,

The pattern of getting, enabling and setting a disable callback for a clock can be replaced with devm_clk_get_enabled(), which also fixes this warning.

Fixes: 6ae9ca9ce986 ("ASoC: meson: aiu: add i2s and spdif support") Reported-by: Arnd Bergmann arnd@arndb.de Signed-off-by: Jerome Brunet jbrunet@baylibre.com

Silences the warning and makes the code more readable without adding any new helpers. Awesome!

Reviewed-by: Justin Stitt justinstitt@google.com

---

sound/soc/meson/aiu.c | 19 ++++--------------- sound/soc/meson/aiu.h | 1 - 2 files changed, 4 insertions(+), 16 deletions(-)

diff --git a/sound/soc/meson/aiu.c b/sound/soc/meson/aiu.c index 7109b81cc3d0..5d1419ed7a62 100644 --- a/sound/soc/meson/aiu.c +++ b/sound/soc/meson/aiu.c @@ -212,11 +212,12 @@ static const char * const aiu_spdif_ids[] = { static int aiu_clk_get(struct device *dev) { struct aiu *aiu = dev_get_drvdata(dev);

• struct clk *pclk; int ret;

• aiu->pclk = devm_clk_get(dev, "pclk");
• if (IS_ERR(aiu->pclk))

• return dev_err_probe(dev, PTR_ERR(aiu->pclk), "Can't get the aiu pclk\n");
  

• pclk = devm_clk_get_enabled(dev, "pclk");

• if (IS_ERR(pclk))

• return dev_err_probe(dev, PTR_ERR(pclk), "Can't get the aiu pclk\n");
  
  

  aiu->spdif_mclk = devm_clk_get(dev, "spdif_mclk"); if (IS_ERR(aiu->spdif_mclk))

@@ -233,18 +234,6 @@ static int aiu_clk_get(struct device *dev) if (ret) return dev_err_probe(dev, ret, "Can't get the spdif clocks\n");

• ret = clk_prepare_enable(aiu->pclk);
• if (ret) {

• dev_err(dev, "peripheral clock enable failed\n");
  

• return ret;
  

• }
• ret = devm_add_action_or_reset(dev,

• 		       (void(*)(void *))clk_disable_unprepare,
  

• 		       aiu->pclk);
  

• if (ret)

• dev_err(dev, "failed to add reset action on pclk");
  

• return ret;

}

diff --git a/sound/soc/meson/aiu.h b/sound/soc/meson/aiu.h index 393b6c2307e4..0f94c8bf6081 100644 --- a/sound/soc/meson/aiu.h +++ b/sound/soc/meson/aiu.h @@ -33,7 +33,6 @@ struct aiu_platform_data { };

struct aiu {

• struct clk *pclk; struct clk *spdif_mclk; struct aiu_interface i2s; struct aiu_interface spdif;

-- 2.43.0

Thanks Justin