linux-kernel - [PATCH 06/12] usb: gadget: at91

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Message-Id: <1421252524-24452-7-git-send-email-alexandre.belloni@free-electrons.com>
Date:	Wed, 14 Jan 2015 17:21:58 +0100
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Felipe Balbi <balbi@...com>
Cc:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Arnd Bergmann <arnd@...db.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Subject: [PATCH 06/12] usb: gadget: at91_udc: Drop uclk clock

From: Boris Brezillon <boris.brezillon@...e-electrons.com>

Now that at91 system clocks forward set_rate request to their parent we
can remove the uclk clock and directly call clk_set_rate on fclk.

Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
---
 drivers/usb/gadget/udc/at91_udc.c | 27 +++------------------------
 drivers/usb/gadget/udc/at91_udc.h |  2 +-
 2 files changed, 4 insertions(+), 25 deletions(-)

diff --git a/drivers/usb/gadget/udc/at91_udc.c b/drivers/usb/gadget/udc/at91_udc.c
index 9ff2f7e5c6a7..d33f2994b7c4 100644
--- a/drivers/usb/gadget/udc/at91_udc.c
+++ b/drivers/usb/gadget/udc/at91_udc.c
@@ -895,8 +895,6 @@ static void clk_on(struct at91_udc *udc)
 		return;
 	udc->clocked = 1;
 
-	if (IS_ENABLED(CONFIG_COMMON_CLK))
-		clk_enable(udc->uclk);
 	clk_enable(udc->iclk);
 	clk_enable(udc->fclk);
 }
@@ -909,8 +907,6 @@ static void clk_off(struct at91_udc *udc)
 	udc->gadget.speed = USB_SPEED_UNKNOWN;
 	clk_disable(udc->fclk);
 	clk_disable(udc->iclk);
-	if (IS_ENABLED(CONFIG_COMMON_CLK))
-		clk_disable(udc->uclk);
 }
 
 /*
@@ -1781,25 +1777,17 @@ static int at91udc_probe(struct platform_device *pdev)
 	/* get interface and function clocks */
 	udc->iclk = clk_get(dev, "pclk");
 	udc->fclk = clk_get(dev, "hclk");
-	if (IS_ENABLED(CONFIG_COMMON_CLK))
-		udc->uclk = clk_get(dev, "usb_clk");
-	if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk) ||
-	    (IS_ENABLED(CONFIG_COMMON_CLK) && IS_ERR(udc->uclk))) {
+	if (IS_ERR(udc->iclk) || IS_ERR(udc->fclk)) {
 		DBG("clocks missing\n");
 		retval = -ENODEV;
 		goto fail1;
 	}
 
 	/* don't do anything until we have both gadget driver and VBUS */
-	if (IS_ENABLED(CONFIG_COMMON_CLK)) {
-		clk_set_rate(udc->uclk, 48000000);
-		retval = clk_prepare(udc->uclk);
-		if (retval)
-			goto fail1;
-	}
+	clk_set_rate(udc->fclk, 48000000);
 	retval = clk_prepare(udc->fclk);
 	if (retval)
-		goto fail1a;
+		goto fail1;
 
 	retval = clk_prepare_enable(udc->iclk);
 	if (retval)
@@ -1873,12 +1861,7 @@ fail1c:
 	clk_unprepare(udc->iclk);
 fail1b:
 	clk_unprepare(udc->fclk);
-fail1a:
-	if (IS_ENABLED(CONFIG_COMMON_CLK))
-		clk_unprepare(udc->uclk);
 fail1:
-	if (IS_ENABLED(CONFIG_COMMON_CLK) && !IS_ERR(udc->uclk))
-		clk_put(udc->uclk);
 	if (!IS_ERR(udc->fclk))
 		clk_put(udc->fclk);
 	if (!IS_ERR(udc->iclk))
@@ -1924,15 +1907,11 @@ static int __exit at91udc_remove(struct platform_device *pdev)
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	release_mem_region(res->start, resource_size(res));
 
-	if (IS_ENABLED(CONFIG_COMMON_CLK))
-		clk_unprepare(udc->uclk);
 	clk_unprepare(udc->fclk);
 	clk_unprepare(udc->iclk);
 
 	clk_put(udc->iclk);
 	clk_put(udc->fclk);
-	if (IS_ENABLED(CONFIG_COMMON_CLK))
-		clk_put(udc->uclk);
 
 	return 0;
 }
diff --git a/drivers/usb/gadget/udc/at91_udc.h b/drivers/usb/gadget/udc/at91_udc.h
index 017524663381..e647d1c2ada4 100644
--- a/drivers/usb/gadget/udc/at91_udc.h
+++ b/drivers/usb/gadget/udc/at91_udc.h
@@ -126,7 +126,7 @@ struct at91_udc {
 	unsigned			active_suspend:1;
 	u8				addr;
 	struct at91_udc_data		board;
-	struct clk			*iclk, *fclk, *uclk;
+	struct clk			*iclk, *fclk;
 	struct platform_device		*pdev;
 	struct proc_dir_entry		*pde;
 	void __iomem			*udp_baseaddr;
-- 
2.1.0

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