[PATCH 4/7] usb: fotg210: Move clock handling to core

[Linus Walleij]

Grab the optional silicon block clock, prepare and enable it in
the core before proceeding to prepare the host or peripheral
driver. This saves duplicate code and also uses the simple
devm_clk_get_optional_enabled() to do everything we really
want to do.

Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
 drivers/usb/fotg210/fotg210-core.c |  5 +++++
 drivers/usb/fotg210/fotg210-hcd.c  | 33 ++-------------------------------
 drivers/usb/fotg210/fotg210-udc.c  | 30 +++---------------------------
 drivers/usb/fotg210/fotg210-udc.h  |  1 -
 drivers/usb/fotg210/fotg210.h      |  1 +
 5 files changed, 11 insertions(+), 59 deletions(-)

diff --git a/drivers/usb/fotg210/fotg210-core.c b/drivers/usb/fotg210/fotg210-core.c
index 4593120c02de..58d84747fb30 100644
--- a/drivers/usb/fotg210/fotg210-core.c
+++ b/drivers/usb/fotg210/fotg210-core.c
@@ -6,6 +6,7 @@
  * driver.
  */
 #include <linux/bitops.h>
+#include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/mfd/syscon.h>
 #include <linux/module.h>
@@ -109,6 +110,10 @@ static int fotg210_probe(struct platform_device *pdev)
 	if (!fotg->base)
 		return -ENOMEM;
 
+	fotg->pclk = devm_clk_get_optional_enabled(dev, "PCLK");
+	if (IS_ERR(fotg->pclk))
+		return PTR_ERR(fotg->pclk);
+
 	mode = usb_get_dr_mode(dev);
 
 	if (of_device_is_compatible(dev->of_node, "cortina,gemini-usb")) {
diff --git a/drivers/usb/fotg210/fotg210-hcd.c b/drivers/usb/fotg210/fotg210-hcd.c
index 15ba5b1618e1..7bd1e8f3080d 100644
--- a/drivers/usb/fotg210/fotg210-hcd.c
+++ b/drivers/usb/fotg210/fotg210-hcd.c
@@ -33,7 +33,6 @@
 #include <linux/platform_device.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
-#include <linux/clk.h>
 
 #include <asm/byteorder.h>
 #include <asm/irq.h>
@@ -5594,44 +5593,22 @@ int fotg210_hcd_probe(struct platform_device *pdev, struct fotg210 *fotg)
 	fotg210->fotg = fotg;
 	fotg210->caps = hcd->regs;
 
-	/* It's OK not to supply this clock */
-	fotg210->pclk = clk_get(dev, "PCLK");
-	if (!IS_ERR(fotg210->pclk)) {
-		retval = clk_prepare_enable(fotg210->pclk);
-		if (retval) {
-			dev_err(dev, "failed to enable PCLK\n");
-			goto failed_put_hcd;
-		}
-	} else if (PTR_ERR(fotg210->pclk) == -EPROBE_DEFER) {
-		/*
-		 * Percolate deferrals, for anything else,
-		 * just live without the clocking.
-		 */
-		retval = PTR_ERR(fotg210->pclk);
-		goto failed_dis_clk;
-	}
-
 	retval = fotg210_setup(hcd);
 	if (retval)
-		goto failed_dis_clk;
+		goto failed_put_hcd;
 
 	fotg210_init(fotg210);
 
 	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
 	if (retval) {
 		dev_err(dev, "failed to add hcd with err %d\n", retval);
-		goto failed_dis_clk;
+		goto failed_put_hcd;
 	}
 	device_wakeup_enable(hcd->self.controller);
 	platform_set_drvdata(pdev, hcd);
 
 	return retval;
 
-failed_dis_clk:
-	if (!IS_ERR(fotg210->pclk)) {
-		clk_disable_unprepare(fotg210->pclk);
-		clk_put(fotg210->pclk);
-	}
 failed_put_hcd:
 	usb_put_hcd(hcd);
 fail_create_hcd:
@@ -5647,12 +5624,6 @@ int fotg210_hcd_probe(struct platform_device *pdev, struct fotg210 *fotg)
 int fotg210_hcd_remove(struct platform_device *pdev)
 {
 	struct usb_hcd *hcd = platform_get_drvdata(pdev);
-	struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
-
-	if (!IS_ERR(fotg210->pclk)) {
-		clk_disable_unprepare(fotg210->pclk);
-		clk_put(fotg210->pclk);
-	}
 
 	usb_remove_hcd(hcd);
 	usb_put_hcd(hcd);
diff --git a/drivers/usb/fotg210/fotg210-udc.c b/drivers/usb/fotg210/fotg210-udc.c
index 034193592a36..6a4b94d26951 100644
--- a/drivers/usb/fotg210/fotg210-udc.c
+++ b/drivers/usb/fotg210/fotg210-udc.c
@@ -15,7 +15,6 @@
 #include <linux/platform_device.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
-#include <linux/clk.h>
 #include <linux/usb/otg.h>
 #include <linux/usb/phy.h>
 
@@ -1134,9 +1133,6 @@ int fotg210_udc_remove(struct platform_device *pdev)
 	for (i = 0; i < FOTG210_MAX_NUM_EP; i++)
 		kfree(fotg210->ep[i]);
 
-	if (!IS_ERR(fotg210->pclk))
-		clk_disable_unprepare(fotg210->pclk);
-
 	kfree(fotg210);
 
 	return 0;
@@ -1164,34 +1160,17 @@ int fotg210_udc_probe(struct platform_device *pdev, struct fotg210 *fotg)
 	fotg210->dev = dev;
 	fotg210->fotg = fotg;
 
-	/* It's OK not to supply this clock */
-	fotg210->pclk = devm_clk_get(dev, "PCLK");
-	if (!IS_ERR(fotg210->pclk)) {
-		ret = clk_prepare_enable(fotg210->pclk);
-		if (ret) {
-			dev_err(dev, "failed to enable PCLK\n");
-			goto err;
-		}
-	} else if (PTR_ERR(fotg210->pclk) == -EPROBE_DEFER) {
-		/*
-		 * Percolate deferrals, for anything else,
-		 * just live without the clocking.
-		 */
-		ret = -EPROBE_DEFER;
-		goto err;
-	}
-
 	fotg210->phy = devm_usb_get_phy_by_phandle(dev, "usb-phy", 0);
 	if (IS_ERR(fotg210->phy)) {
 		ret = PTR_ERR(fotg210->phy);
 		if (ret == -EPROBE_DEFER)
-			goto err_pclk;
+			goto err_free;
 		dev_info(dev, "no PHY found\n");
 		fotg210->phy = NULL;
 	} else {
 		ret = usb_phy_init(fotg210->phy);
 		if (ret)
-			goto err_pclk;
+			goto err_free;
 		dev_info(dev, "found and initialized PHY\n");
 	}
 
@@ -1286,11 +1265,8 @@ int fotg210_udc_probe(struct platform_device *pdev, struct fotg210 *fotg)
 err_alloc:
 	for (i = 0; i < FOTG210_MAX_NUM_EP; i++)
 		kfree(fotg210->ep[i]);
-err_pclk:
-	if (!IS_ERR(fotg210->pclk))
-		clk_disable_unprepare(fotg210->pclk);
 
-err:
+err_free:
 	kfree(fotg210);
 	return ret;
 }
diff --git a/drivers/usb/fotg210/fotg210-udc.h b/drivers/usb/fotg210/fotg210-udc.h
index 20335a38a410..22b72caf498c 100644
--- a/drivers/usb/fotg210/fotg210-udc.h
+++ b/drivers/usb/fotg210/fotg210-udc.h
@@ -231,7 +231,6 @@ struct fotg210_ep {
 struct fotg210_udc {
 	spinlock_t		lock; /* protect the struct */
 	void __iomem		*reg;
-	struct clk		*pclk;
 
 	unsigned long		irq_trigger;
 
diff --git a/drivers/usb/fotg210/fotg210.h b/drivers/usb/fotg210/fotg210.h
index 50436cc16538..4d0d4ae1a957 100644
--- a/drivers/usb/fotg210/fotg210.h
+++ b/drivers/usb/fotg210/fotg210.h
@@ -12,6 +12,7 @@ struct fotg210 {
 	struct device *dev;
 	struct resource *res;
 	void __iomem *base;
+	struct clk *pclk;
 	struct regmap *map;
 	enum gemini_port port;
 };

-- 
2.38.1