[03/12] phy: ti-pipe3: cleanup clock handling

Commit Message

Roger Quadros March 3, 2014, 3:07 p.m. UTC

As this driver is no longer USB specific, use generic clock names.
- Fix PLL_SD_SHIFT from 9 to 10
- As optclk and wkupclk may not be always required, don't bail out
if they aren't available.
- Don't separate prepare/unprepare clock from enable/disable. This
ensures optimal power savings.

Signed-off-by: Roger Quadros <[e-mail]>
---
 drivers/phy/phy-ti-pipe3.c | 57 ++++++++++++++++++++++------------------------
 1 file changed, 27 insertions(+), 30 deletions(-)

Comments

Kishon Vijay Abraham I March 4, 2014, 9:29 a.m. UTC | #1

Hi,

On Monday 03 March 2014 08:37 PM, Roger Quadros wrote:
> As this driver is no longer USB specific, use generic clock names.
> - Fix PLL_SD_SHIFT from 9 to 10
> - As optclk and wkupclk may not be always required, don't bail out
> if they aren't available.

I think here too we face the same problem as for PHY. What if a 
particular platform needs a clock but is not available. I don't want 
this to be blocking though.

Thanks
Kishon

Roger Quadros March 4, 2014, 9:33 a.m. UTC | #2

On 03/04/2014 11:29 AM, Kishon Vijay Abraham I wrote:
> Hi,
> 
> On Monday 03 March 2014 08:37 PM, Roger Quadros wrote:
>> As this driver is no longer USB specific, use generic clock names.
>> - Fix PLL_SD_SHIFT from 9 to 10
>> - As optclk and wkupclk may not be always required, don't bail out
>> if they aren't available.
> 
> I think here too we face the same problem as for PHY. What if a particular platform needs a clock but is not available. I don't want this to be blocking though.

Since we know for sure what clocks the different TI PHYs need, we could do the checks based on compatible id and always fail on clock error.

cheers,
-roger

Patch

diff --git a/drivers/phy/phy-ti-pipe3.c b/drivers/phy/phy-ti-pipe3.c
index 54859fc..3662e28 100644
--- a/drivers/phy/phy-ti-pipe3.c
+++ b/drivers/phy/phy-ti-pipe3.c
@@ -45,7 +45,7 @@ 
 #define	PLL_SELFREQDCO_MASK	0x0000000E
 #define	PLL_SELFREQDCO_SHIFT	0x1
 #define	PLL_SD_MASK		0x0003FC00
-#define	PLL_SD_SHIFT		0x9
+#define	PLL_SD_SHIFT		10
 #define	SET_PLL_GO		0x1
 #define	PLL_TICOPWDN		0x10000
 #define	PLL_LOCK		0x2
@@ -270,23 +270,17 @@  static int ti_pipe3_probe(struct platform_device *pdev)
 
 	phy->dev		= &pdev->dev;
 
-	phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
-	if (IS_ERR(phy->wkupclk)) {
-		dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
-		return PTR_ERR(phy->wkupclk);
-	}
-	clk_prepare(phy->wkupclk);
+	phy->wkupclk = devm_clk_get(phy->dev, "wkupclk");
+	if (IS_ERR(phy->wkupclk))
+		dev_dbg(&pdev->dev, "unable to get wkupclk\n");
 
-	phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
-	if (IS_ERR(phy->optclk)) {
-		dev_err(&pdev->dev, "unable to get usb_otg_ss_refclk960m\n");
-		return PTR_ERR(phy->optclk);
-	}
-	clk_prepare(phy->optclk);
+	phy->optclk = devm_clk_get(phy->dev, "optclk");
+	if (IS_ERR(phy->optclk))
+		dev_dbg(&pdev->dev, "unable to get optclk\n");
 
-	phy->sys_clk = devm_clk_get(phy->dev, "sys_clkin");
+	phy->sys_clk = devm_clk_get(phy->dev, "sysclk");
 	if (IS_ERR(phy->sys_clk)) {
-		pr_err("%s: unable to get sys_clkin\n", __func__);
+		dev_err(&pdev->dev, "unable to get sysclk\n");
 		return -EINVAL;
 	}
 
@@ -326,10 +320,6 @@  static int ti_pipe3_probe(struct platform_device *pdev)
 
 static int ti_pipe3_remove(struct platform_device *pdev)
 {
-	struct ti_pipe3 *phy = platform_get_drvdata(pdev);
-
-	clk_unprepare(phy->wkupclk);
-	clk_unprepare(phy->optclk);
 	if (!pm_runtime_suspended(&pdev->dev))
 		pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
@@ -343,8 +333,10 @@  static int ti_pipe3_runtime_suspend(struct device *dev)
 {
 	struct ti_pipe3	*phy = dev_get_drvdata(dev);
 
-	clk_disable(phy->wkupclk);
-	clk_disable(phy->optclk);
+	if (!IS_ERR(phy->wkupclk))
+		clk_disable_unprepare(phy->wkupclk);
+	if (!IS_ERR(phy->optclk))
+		clk_disable_unprepare(phy->optclk);
 
 	return 0;
 }
@@ -354,22 +346,27 @@  static int ti_pipe3_runtime_resume(struct device *dev)
 	u32 ret = 0;
 	struct ti_pipe3	*phy = dev_get_drvdata(dev);
 
-	ret = clk_enable(phy->optclk);
-	if (ret) {
-		dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
-		goto err1;
+	if (!IS_ERR(phy->optclk)) {
+		ret = clk_prepare_enable(phy->optclk);
+		if (ret) {
+			dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
+			goto err1;
+		}
 	}
 
-	ret = clk_enable(phy->wkupclk);
-	if (ret) {
-		dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
-		goto err2;
+	if (!IS_ERR(phy->wkupclk)) {
+		ret = clk_prepare_enable(phy->wkupclk);
+		if (ret) {
+			dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
+			goto err2;
+		}
 	}
 
 	return 0;
 
 err2:
-	clk_disable(phy->optclk);
+	if (!IS_ERR(phy->optclk))
+		clk_disable_unprepare(phy->optclk);
 
 err1:
 	return ret;