[PATCH v2 2/5] crypto: ccree: better clock handling

[Gilad Ben-Yossef]

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 <ge...@linux-m68k.org>
Signed-off-by: Gilad Ben-Yossef <gi...@benyossef.com>
---
 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