[PATCH 3/4] arm: imx8mq: Add USB clock init function

Ye Li
2021-02-21T16:26:23Z

Add clock function to setup relevant clocks for USB3.0 controllers and
PHYs on i.MX8MQ

Signed-off-by: Ye Li <ye.li@nxp.com>
---
arch/arm/include/asm/arch-imx8m/clock.h | 1 +
arch/arm/mach-imx/imx8m/clock_imx8mq.c | 22 ++++++++++++++++++++++
2 files changed, 23 insertions(+)

diff --git a/arch/arm/include/asm/arch-imx8m/clock.h b/arch/arm/include/asm/arch-imx8m/clock.h
index c545eb8..e806552 100644
--- a/arch/arm/include/asm/arch-imx8m/clock.h
+++ b/arch/arm/include/asm/arch-imx8m/clock.h
@@ -257,6 +257,7 @@ u32 imx_get_uartclk(void);
int clock_init(void);
void init_clk_usdhc(u32 index);
void init_uart_clk(u32 index);
+void init_usb_clk(void);
void init_wdog_clk(void);
unsigned int mxc_get_clock(enum mxc_clock clk);
int clock_enable(enum clk_ccgr_index index, bool enable);
diff --git a/arch/arm/mach-imx/imx8m/clock_imx8mq.c b/arch/arm/mach-imx/imx8m/clock_imx8mq.c
index 759ec6d..cccd645 100644
--- a/arch/arm/mach-imx/imx8m/clock_imx8mq.c
+++ b/arch/arm/mach-imx/imx8m/clock_imx8mq.c
@@ -393,6 +393,28 @@ void init_wdog_clk(void)
clock_enable(CCGR_WDOG3, 1);
}

+void init_usb_clk(void)
+{
+ if (!is_usb_boot()) {
+ clock_enable(CCGR_USB_CTRL1, 0);
+ clock_enable(CCGR_USB_CTRL2, 0);
+ clock_enable(CCGR_USB_PHY1, 0);
+ clock_enable(CCGR_USB_PHY2, 0);
+ /* 500MHz */
+ clock_set_target_val(USB_BUS_CLK_ROOT, CLK_ROOT_ON |
+ CLK_ROOT_SOURCE_SEL(1));
+ /* 100MHz */
+ clock_set_target_val(USB_CORE_REF_CLK_ROOT, CLK_ROOT_ON |
+ CLK_ROOT_SOURCE_SEL(1));
+ /* 100MHz */
+ clock_set_target_val(USB_PHY_REF_CLK_ROOT, CLK_ROOT_ON |
+ CLK_ROOT_SOURCE_SEL(1));
+ clock_enable(CCGR_USB_CTRL1, 1);
+ clock_enable(CCGR_USB_CTRL2, 1);
+ clock_enable(CCGR_USB_PHY1, 1);
+ clock_enable(CCGR_USB_PHY2, 1);
+ }
+}

void init_nand_clk(void)
{
--
2.7.4