crypto: img-hash - Add suspend resume hooks for img hash

Current img hash claims sys and periph gate clocks
and this can be gated in system suspend scenarios.

Add support for Device pm ops for img hash to gate
the clocks claimed by img hash.

Signed-off-by: Govindraj Raja <Govindraj.Raja@imgtec.com>
Reviewed-by: Will Thomas <will.thomas@imgtec.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/img-hash.c b/drivers/crypto/img-hash.c
index f8abbe3bc51c26c9157ef70ce5153927aef2fe64..2622c0174232b9504fd29e5dfc7b29765e56fdab 100644 (file)
--- a/drivers/crypto/img-hash.c
+++ b/drivers/crypto/img-hash.c
@@ -1016,11 +1016,38 @@ static int img_hash_remove(struct platform_device *pdev)
        return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int img_hash_suspend(struct device *dev)
+{
+       struct img_hash_dev *hdev = dev_get_drvdata(dev);
+
+       clk_disable_unprepare(hdev->hash_clk);
+       clk_disable_unprepare(hdev->sys_clk);
+
+       return 0;
+}
+
+static int img_hash_resume(struct device *dev)
+{
+       struct img_hash_dev *hdev = dev_get_drvdata(dev);
+
+       clk_prepare_enable(hdev->hash_clk);
+       clk_prepare_enable(hdev->sys_clk);
+
+       return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops img_hash_pm_ops = {
+       SET_SYSTEM_SLEEP_PM_OPS(img_hash_suspend, img_hash_resume)
+};
+
 static struct platform_driver img_hash_driver = {
        .probe          = img_hash_probe,
        .remove         = img_hash_remove,
        .driver         = {
                .name   = "img-hash-accelerator",
+               .pm     = &img_hash_pm_ops,
                .of_match_table = of_match_ptr(img_hash_match),
        }
 };