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[4/6] crypto: img-hash - Add suspend resume hooks for img hash

Message ID 1468229616-3888-5-git-send-email-will.thomas@imgtec.com (mailing list archive)
State Changes Requested
Delegated to: Herbert Xu
Headers show

Commit Message

Will Thomas July 11, 2016, 9:33 a.m. UTC 
From: Govindraj Raja <Govindraj.Raja@imgtec.com>

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>
---
 drivers/crypto/img-hash.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
diff mbox

Patch

diff --git a/drivers/crypto/img-hash.c b/drivers/crypto/img-hash.c
index fbed47a..ed4408a 100644
--- 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),
 	}
 };