From fb8e1e8dbc47e7aff7624b47adaa0a84d2983802 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Wed, 18 Jan 2023 08:09:18 +0100
Subject: [PATCH 18/29] usb: fotg210: Move clock handling to core

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@linaro.org>
Link: https://lore.kernel.org/r/20230103-gemini-fotg210-usb-v2-4-100388af9810@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
--- 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
 	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")) {
--- 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_de
 	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 @@ fail_create_hcd:
 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);
--- 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>
 
@@ -1147,9 +1146,6 @@ int fotg210_udc_remove(struct platform_d
 	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;
@@ -1177,34 +1173,17 @@ int fotg210_udc_probe(struct platform_de
 	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");
 	}
 
@@ -1303,11 +1282,8 @@ err_map:
 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;
 }
--- 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;
 
--- 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;
 };