On Thu, May 24, 2018 at 03:19:07PM +0100, Gilad Ben-Yossef wrote:
> Use managed clock handling, differentiate between no clock (possibly OK)
> and clock init failure (never OK) and correctly handle clock detection
> being deferred.
>
> Suggested-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
> Signed-off-by: Gilad Ben-Yossef <gilad@xxxxxxxxxxxxx>
Reviewed-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
> ---
> drivers/crypto/ccree/cc_driver.c | 20 +++++++++++++++++++-
> 1 file changed, 19 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/crypto/ccree/cc_driver.c b/drivers/crypto/ccree/cc_driver.c
> index 6f93ce7..b266657 100644
> --- a/drivers/crypto/ccree/cc_driver.c
> +++ b/drivers/crypto/ccree/cc_driver.c
> @@ -190,6 +190,7 @@ static int init_cc_resources(struct platform_device *plat_dev)
> u64 dma_mask;
> const struct cc_hw_data *hw_rev;
> const struct of_device_id *dev_id;
> + struct clk *clk;
> int rc = 0;
>
> new_drvdata = devm_kzalloc(dev, sizeof(*new_drvdata), GFP_KERNEL);
> @@ -219,7 +220,24 @@ static int init_cc_resources(struct platform_device *plat_dev)
> platform_set_drvdata(plat_dev, new_drvdata);
> new_drvdata->plat_dev = plat_dev;
>
> - new_drvdata->clk = of_clk_get(np, 0);
> + clk = devm_clk_get(dev, NULL);
> + if (IS_ERR(clk))
> + switch (PTR_ERR(clk)) {
> + /* Clock is optional so this might be fine */
> + case -ENOENT:
> + break;
> +
> + /* Clock not available, let's try again soon */
> + case -EPROBE_DEFER:
> + return -EPROBE_DEFER;
> +
> + default:
> + dev_err(dev, "Error getting clock: %ld\n",
> + PTR_ERR(clk));
> + return PTR_ERR(clk);
> + }
> + new_drvdata->clk = clk;
> +
> new_drvdata->coherent = of_dma_is_coherent(np);
>
> /* Get device resources */
> --
> 2.7.4
>
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