linux-kernel - [PATCH v6 2/2] usb: chipidea: imx: Disable internal 60Mhz clock with ULPI PHY

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Date:   Mon, 26 Sep 2016 13:14:20 +0200
From:   Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>
To:     Peter.Chen@....com
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>
Subject: [PATCH v6 2/2] usb: chipidea: imx: Disable internal 60Mhz clock with ULPI PHY

The internal 60Mhz clock for host2 and host3 are useless in ULPI
phy mode, so we disable it when configuring ULPI PHY node for
those host.

Signed-off-by: Fabien Lahoudere <fabien.lahoudere@...labora.co.uk>
---
 drivers/usb/chipidea/usbmisc_imx.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 11f51bd..e77a4ed 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)
@@ -239,6 +242,10 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
 			val = readl(reg) | MX53_USB_UHx_CTRL_WAKE_UP_EN
 				| MX53_USB_UHx_CTRL_ULPI_INT_EN;
 			writel(val, reg);
+			/* Disable internal 60Mhz clock */
+			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;
@@ -260,6 +267,10 @@ static int usbmisc_imx53_init(struct imx_usbmisc_data *data)
 			val = readl(reg) | MX53_USB_UHx_CTRL_WAKE_UP_EN
 				| MX53_USB_UHx_CTRL_ULPI_INT_EN;
 			writel(val, reg);
+			/* Disable internal 60Mhz clock */
+			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;
-- 
2.1.4