[PATCH v2 3/5] media: staging: media: imx6-mipi-csi2: use devm_clk_bulk_get_all() to fetch clocks

[Frank Li]

Use devm_clk_bulk_get_all_enabled() helper to simplify clock handling.

Defer all clock prepare and enable to csi2_start(), which previous only
enable pix clock here.

Add clk_enable at log_status().

Do that safely because there are not register access before csi2_start().

Signed-off-by: Frank Li <Frank.Li at nxp.com>
---
changes in v2
- add clk_bulk_prepare_enable() get at csi2_log_status()
---
 drivers/staging/media/imx/imx6-mipi-csi2.c | 57 +++++++++---------------------
 1 file changed, 16 insertions(+), 41 deletions(-)

diff --git a/drivers/staging/media/imx/imx6-mipi-csi2.c b/drivers/staging/media/imx/imx6-mipi-csi2.c
index 4f740170d2bbf586ac0a58b5d25f8f8432e9e6a3..e1b4b7fb53131ce9515b9441d8fc420e85d3e993 100644
--- a/drivers/staging/media/imx/imx6-mipi-csi2.c
+++ b/drivers/staging/media/imx/imx6-mipi-csi2.c
@@ -39,9 +39,8 @@ struct csi2_dev {
 	struct v4l2_subdev sd;
 	struct v4l2_async_notifier notifier;
 	struct media_pad pad[CSI2_NUM_PADS];
-	struct clk *dphy_clk;
-	struct clk *pllref_clk;
-	struct clk *pix_clk; /* what is this? */
+	struct clk_bulk_data *clks;
+	int num_clks;
 	void __iomem *base;
 
 	struct v4l2_subdev *remote;
@@ -343,7 +342,7 @@ static int csi2_start(struct csi2_dev *csi2)
 	unsigned int lanes;
 	int ret;
 
-	ret = clk_prepare_enable(csi2->pix_clk);
+	ret = clk_bulk_prepare_enable(csi2->num_clks, csi2->clks);
 	if (ret)
 		return ret;
 
@@ -390,7 +389,7 @@ static int csi2_start(struct csi2_dev *csi2)
 err_assert_reset:
 	csi2_enable(csi2, false);
 err_disable_clk:
-	clk_disable_unprepare(csi2->pix_clk);
+	clk_bulk_disable_unprepare(csi2->num_clks, csi2->clks);
 	return ret;
 }
 
@@ -401,7 +400,7 @@ static void csi2_stop(struct csi2_dev *csi2)
 	v4l2_subdev_call(csi2->src_sd, video, post_streamoff);
 
 	csi2_enable(csi2, false);
-	clk_disable_unprepare(csi2->pix_clk);
+	clk_bulk_disable_unprepare(csi2->num_clks, csi2->clks);
 }
 
 /*
@@ -570,6 +569,11 @@ static int csi2_registered(struct v4l2_subdev *sd)
 static int csi2_log_status(struct v4l2_subdev *sd)
 {
 	struct csi2_dev *csi2 = sd_to_dev(sd);
+	int ret;
+
+	ret = clk_bulk_prepare_enable(csi2->num_clks, csi2->clks);
+	if (ret)
+		return ret;
 
 	v4l2_info(sd, "-----MIPI CSI status-----\n");
 	v4l2_info(sd, "VERSION: 0x%x\n",
@@ -601,6 +605,8 @@ static int csi2_log_status(struct v4l2_subdev *sd)
 	v4l2_info(sd, "PHY_TST_CTRL1: 0x%x\n",
 		  readl(csi2->base + CSI2_PHY_TST_CTRL1));
 
+	clk_bulk_disable_unprepare(csi2->num_clks, csi2->clks);
+
 	return 0;
 }
 
@@ -749,24 +755,6 @@ static int csi2_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	csi2->pllref_clk = devm_clk_get(&pdev->dev, "ref");
-	if (IS_ERR(csi2->pllref_clk)) {
-		v4l2_err(&csi2->sd, "failed to get pll reference clock\n");
-		return PTR_ERR(csi2->pllref_clk);
-	}
-
-	csi2->dphy_clk = devm_clk_get(&pdev->dev, "dphy");
-	if (IS_ERR(csi2->dphy_clk)) {
-		v4l2_err(&csi2->sd, "failed to get dphy clock\n");
-		return PTR_ERR(csi2->dphy_clk);
-	}
-
-	csi2->pix_clk = devm_clk_get(&pdev->dev, "pix");
-	if (IS_ERR(csi2->pix_clk)) {
-		v4l2_err(&csi2->sd, "failed to get pixel clock\n");
-		return PTR_ERR(csi2->pix_clk);
-	}
-
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		v4l2_err(&csi2->sd, "failed to get platform resources\n");
@@ -781,20 +769,12 @@ static int csi2_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	ret = clk_prepare_enable(csi2->pllref_clk);
-	if (ret) {
-		v4l2_err(&csi2->sd, "failed to enable pllref_clk\n");
-		return ret;
-	}
-
-	ret = clk_prepare_enable(csi2->dphy_clk);
-	if (ret) {
-		v4l2_err(&csi2->sd, "failed to enable dphy_clk\n");
-		goto pllref_off;
-	}
-
 	platform_set_drvdata(pdev, &csi2->sd);
 
+	csi2->num_clks = devm_clk_bulk_get_all(&pdev->dev, &csi2->clks);
+	if (csi2->num_clks < 0)
+		return dev_err_probe(&pdev->dev, csi2->num_clks, "Failed to get clocks\n");
+
 	ret = csi2_async_register(csi2);
 	if (ret)
 		goto clean_notifier;
@@ -804,9 +784,6 @@ static int csi2_probe(struct platform_device *pdev)
 clean_notifier:
 	v4l2_async_nf_unregister(&csi2->notifier);
 	v4l2_async_nf_cleanup(&csi2->notifier);
-	clk_disable_unprepare(csi2->dphy_clk);
-pllref_off:
-	clk_disable_unprepare(csi2->pllref_clk);
 	return ret;
 }
 
@@ -818,8 +795,6 @@ static void csi2_remove(struct platform_device *pdev)
 	v4l2_async_nf_unregister(&csi2->notifier);
 	v4l2_async_nf_cleanup(&csi2->notifier);
 	v4l2_async_unregister_subdev(sd);
-	clk_disable_unprepare(csi2->dphy_clk);
-	clk_disable_unprepare(csi2->pllref_clk);
 	media_entity_cleanup(&sd->entity);
 }
 

-- 
2.34.1