On Fri, 23 Aug 2024 12:16:02 +0200
Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx> wrote:
> Use devm_clk_get_enabled() to drop clock prepare/unprepare parts and
> make code simpler.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
LGTM.
Follow up suggestion inline.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
> ---
> drivers/memory/pl353-smc.c | 36 +++---------------------------------
> 1 file changed, 3 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/memory/pl353-smc.c b/drivers/memory/pl353-smc.c
> index c75b99e49970..994c7a792e34 100644
> --- a/drivers/memory/pl353-smc.c
> +++ b/drivers/memory/pl353-smc.c
> @@ -75,34 +75,21 @@ static int pl353_smc_probe(struct amba_device *adev, const struct amba_id *id)
> const struct of_device_id *match = NULL;
> struct pl353_smc_data *pl353_smc;
> struct device_node *child;
> - int err;
>
> pl353_smc = devm_kzalloc(&adev->dev, sizeof(*pl353_smc), GFP_KERNEL);
> if (!pl353_smc)
> return -ENOMEM;
>
> - pl353_smc->aclk = devm_clk_get(&adev->dev, "apb_pclk");
> + pl353_smc->aclk = devm_clk_get_enabled(&adev->dev, "apb_pclk");
> if (IS_ERR(pl353_smc->aclk))
> return dev_err_probe(&adev->dev, PTR_ERR(pl353_smc->aclk),
> "aclk clock not found.\n");
>
> - pl353_smc->memclk = devm_clk_get(&adev->dev, "memclk");
> + pl353_smc->memclk = devm_clk_get_enabled(&adev->dev, "memclk");
> if (IS_ERR(pl353_smc->memclk))
> return dev_err_probe(&adev->dev, PTR_ERR(pl353_smc->memclk),
> "memclk clock not found.\n");
>
> - err = clk_prepare_enable(pl353_smc->aclk);
> - if (err) {
> - dev_err(&adev->dev, "Unable to enable AXI clock.\n");
> - return err;
> - }
> -
> - err = clk_prepare_enable(pl353_smc->memclk);
> - if (err) {
> - dev_err(&adev->dev, "Unable to enable memory clock.\n");
> - goto disable_axi_clk;
> - }
> -
> amba_set_drvdata(adev, pl353_smc);
>
> /* Find compatible children. Only a single child is supported */
> @@ -115,30 +102,14 @@ static int pl353_smc_probe(struct amba_device *adev, const struct amba_id *id)
> break;
> }
> if (!match) {
With change below this becomes unconditional as we'll have already
returned in the loop for the good path.
Might as well use dev_err_probe() here as well to save a few lines.
> - err = -ENODEV;
> dev_err(&adev->dev, "no matching children\n");
> - goto disable_mem_clk;
> + return -ENODEV;
> }
>
> of_platform_device_create(child, NULL, &adev->dev);
> of_node_put(child);
An additional cleanup looks sensible here.
Push this last bit into the loop and use
for_each_available_child_of_node_scoped()
Assuming you don't already have a patch doing that :)
>
> return 0;
> -
> -disable_mem_clk:
> - clk_disable_unprepare(pl353_smc->memclk);
> -disable_axi_clk:
> - clk_disable_unprepare(pl353_smc->aclk);
> -
> - return err;
> -}
> -
> -static void pl353_smc_remove(struct amba_device *adev)
> -{
> - struct pl353_smc_data *pl353_smc = amba_get_drvdata(adev);
> -
> - clk_disable_unprepare(pl353_smc->memclk);
> - clk_disable_unprepare(pl353_smc->aclk);
> }
>
> static const struct amba_id pl353_ids[] = {
> @@ -157,7 +128,6 @@ static struct amba_driver pl353_smc_driver = {
> },
> .id_table = pl353_ids,
> .probe = pl353_smc_probe,
> - .remove = pl353_smc_remove,
> };
>
> module_amba_driver(pl353_smc_driver);
>
