On Sat, Dec 31, 2022 at 01:26:09PM +0100, Christophe JAILLET wrote:
> The devm_clk_get_enabled() helper:
> - calls devm_clk_get()
> - calls clk_prepare_enable() and registers what is needed in order to
> call clk_disable_unprepare() when needed, as a managed resource.
>
> This simplifies the code and avoids the need of a dedicated function used
> with devm_add_action_or_reset().
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
> Note that the order of operations is slightly modified by this patch. The
> "reg" clk is now prepare_enable()'ed before clk_get("wdtclk").
> ---
> drivers/watchdog/lpc18xx_wdt.c | 30 ++----------------------------
> 1 file changed, 2 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/watchdog/lpc18xx_wdt.c b/drivers/watchdog/lpc18xx_wdt.c
> index 60b6d74f267d..1b9b5f21a0df 100644
> --- a/drivers/watchdog/lpc18xx_wdt.c
> +++ b/drivers/watchdog/lpc18xx_wdt.c
> @@ -197,16 +197,10 @@ static const struct watchdog_ops lpc18xx_wdt_ops = {
> .restart = lpc18xx_wdt_restart,
> };
>
> -static void lpc18xx_clk_disable_unprepare(void *data)
> -{
> - clk_disable_unprepare(data);
> -}
> -
> static int lpc18xx_wdt_probe(struct platform_device *pdev)
> {
> struct lpc18xx_wdt_dev *lpc18xx_wdt;
> struct device *dev = &pdev->dev;
> - int ret;
>
> lpc18xx_wdt = devm_kzalloc(dev, sizeof(*lpc18xx_wdt), GFP_KERNEL);
> if (!lpc18xx_wdt)
> @@ -216,38 +210,18 @@ static int lpc18xx_wdt_probe(struct platform_device *pdev)
> if (IS_ERR(lpc18xx_wdt->base))
> return PTR_ERR(lpc18xx_wdt->base);
>
> - lpc18xx_wdt->reg_clk = devm_clk_get(dev, "reg");
> + lpc18xx_wdt->reg_clk = devm_clk_get_enabled(dev, "reg");
> if (IS_ERR(lpc18xx_wdt->reg_clk)) {
> dev_err(dev, "failed to get the reg clock\n");
> return PTR_ERR(lpc18xx_wdt->reg_clk);
> }
>
> - lpc18xx_wdt->wdt_clk = devm_clk_get(dev, "wdtclk");
> + lpc18xx_wdt->wdt_clk = devm_clk_get_enabled(dev, "wdtclk");
> if (IS_ERR(lpc18xx_wdt->wdt_clk)) {
> dev_err(dev, "failed to get the wdt clock\n");
> return PTR_ERR(lpc18xx_wdt->wdt_clk);
> }
>
> - ret = clk_prepare_enable(lpc18xx_wdt->reg_clk);
> - if (ret) {
> - dev_err(dev, "could not prepare or enable sys clock\n");
> - return ret;
> - }
> - ret = devm_add_action_or_reset(dev, lpc18xx_clk_disable_unprepare,
> - lpc18xx_wdt->reg_clk);
> - if (ret)
> - return ret;
> -
> - ret = clk_prepare_enable(lpc18xx_wdt->wdt_clk);
> - if (ret) {
> - dev_err(dev, "could not prepare or enable wdt clock\n");
> - return ret;
> - }
> - ret = devm_add_action_or_reset(dev, lpc18xx_clk_disable_unprepare,
> - lpc18xx_wdt->wdt_clk);
> - if (ret)
> - return ret;
> -
> /* We use the clock rate to calculate timeouts */
> lpc18xx_wdt->clk_rate = clk_get_rate(lpc18xx_wdt->wdt_clk);
> if (lpc18xx_wdt->clk_rate == 0) {
> --
> 2.34.1
>
