linux-kernel - [PATCH 1/1] ARM: imx53: Add binding to disable USB 60Mhz clock

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Date:   Fri, 16 Sep 2016 12:53:33 +0200
From:   Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>,
        Peter Chen <Peter.Chen@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org (open list:CHIPIDEA USB HIGH SPEED DUAL ROLE
        CONTROLLER), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 1/1] ARM: imx53: Add binding to disable USB 60Mhz clock

This binding allow to disable the internal 60Mhz clock for USB host2 and
host3.

Signed-off-by: Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>
---
 drivers/usb/chipidea/ci_hdrc_imx.c |  2 ++
 drivers/usb/chipidea/ci_hdrc_imx.h |  1 +
 drivers/usb/chipidea/usbmisc_imx.c | 17 +++++++++++++++++
 3 files changed, 20 insertions(+)

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index 96c0e33..89a9d98 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -147,6 +147,8 @@ static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
 	if (of_find_property(np, "external-vbus-divider", NULL))
 		data->evdo = 1;
 
+	if (of_find_property(np, "disable-int60ck", NULL))
+		data->disable_int60ck = 1;
 
 	if (of_usb_get_phy_mode(np) == USBPHY_INTERFACE_MODE_ULPI)
 		data->ulpi = 1;
diff --git a/drivers/usb/chipidea/ci_hdrc_imx.h b/drivers/usb/chipidea/ci_hdrc_imx.h
index d666c9f..43bafae 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.h
+++ b/drivers/usb/chipidea/ci_hdrc_imx.h
@@ -20,6 +20,7 @@ struct imx_usbmisc_data {
 	unsigned int oc_polarity:1; /* over current polarity if oc enabled */
 	unsigned int evdo:1; /* set external vbus divider option */
 	unsigned int ulpi:1; /* connected to an ULPI phy */
+	unsigned int disable_int60ck:1; /* disable 60 MHZ clock */
 };
 
 int imx_usbmisc_init(struct imx_usbmisc_data *);
diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 5472900..bffc667 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -53,6 +53,9 @@
 #define MX53_USB_CTRL_1_H3_XCVR_CLK_SEL_ULPI BIT(6)
 #define MX53_USB_UH2_CTRL_OFFSET	0x14
 #define MX53_USB_UH3_CTRL_OFFSET	0x18
+#define MX53_USB_CLKONOFF_CTRL_OFFSET	0x24
+#define MX53_USB_CLKONOFF_CTRL_H2_INT60CKOFF BIT(21)
+#define MX53_USB_CLKONOFF_CTRL_H3_INT60CKOFF BIT(22)
 #define MX53_BM_OVER_CUR_DIS_H1		BIT(5)
 #define MX53_BM_OVER_CUR_DIS_OTG	BIT(8)
 #define MX53_BM_OVER_CUR_DIS_UHx	BIT(30)
@@ -242,6 +245,13 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
 					| MX53_USB_UHx_CTRL_ULPI_INT_EN;
 				writel(val, reg);
 			}
+			if (data->disable_int60ck) {
+				reg = usbmisc->base +
+					MX53_USB_CLKONOFF_CTRL_OFFSET;
+				val = readl(reg)
+					| MX53_USB_CLKONOFF_CTRL_H2_INT60CKOFF;
+				writel(val, reg);
+			}
 			if (data->disable_oc) {
 				reg = usbmisc->base + MX53_USB_UH2_CTRL_OFFSET;
 				val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
@@ -264,6 +274,13 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
 					| MX53_USB_UHx_CTRL_ULPI_INT_EN;
 				writel(val, reg);
 			}
+			if (data->disable_int60ck) {
+				reg = usbmisc->base +
+					MX53_USB_CLKONOFF_CTRL_OFFSET;
+				val = readl(reg)
+					| MX53_USB_CLKONOFF_CTRL_H3_INT60CKOFF;
+				writel(val, reg);
+			}
 			if (data->disable_oc) {
 				reg = usbmisc->base + MX53_USB_UH3_CTRL_OFFSET;
 				val = readl(reg) | MX53_BM_OVER_CUR_DIS_UHx;
-- 
2.1.4