From: Anand Gadiyar Date: Mon, 10 Jan 2011 14:42:15 +0000 (+0000) Subject: arm: omap4: pandaboard: turn on PHY reference clock at init X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1740d483ba4d79f9fa6984dccd7152b6b208f1bf;p=linux-beck.git arm: omap4: pandaboard: turn on PHY reference clock at init The SMSC 3320 USB PHY on the OMAP4 Pandaboard needs a 19.2 MHz reference clock. This clock is provided from the OMAP4's fref_clk3 pad. Recent changes to clock44xx_data.c made the clock framework aware of the existence of these fref_clk[i] lines. If the option CONFIG_OMAP_RESET_CLOCKS is enabled in the kernel, then the clock framework will turn these clocks off during bootup. Explicitly request and keep this clock enabled at init for the Pandaboard, so that the PHY receives this clock at all times. Reported-by: Ming Lei Signed-off-by: Anand Gadiyar Cc: Benoit Cousson Reviewed-by: Paul Walmsley Signed-off-by: Tony Lindgren --- diff --git a/arch/arm/mach-omap2/board-omap4panda.c b/arch/arm/mach-omap2/board-omap4panda.c index b43e3ff9adec..613bdd89bcfa 100644 --- a/arch/arm/mach-omap2/board-omap4panda.c +++ b/arch/arm/mach-omap2/board-omap4panda.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -95,7 +96,16 @@ static const struct ehci_hcd_omap_platform_data ehci_pdata __initconst = { static void __init omap4_ehci_init(void) { int ret; + struct clk *phy_ref_clk; + /* FREF_CLK3 provides the 19.2 MHz reference clock to the PHY */ + phy_ref_clk = clk_get(NULL, "auxclk3_ck"); + if (IS_ERR(phy_ref_clk)) { + pr_err("Cannot request auxclk3\n"); + goto error1; + } + clk_set_rate(phy_ref_clk, 19200000); + clk_enable(phy_ref_clk); /* disable the power to the usb hub prior to init */ ret = gpio_request(GPIO_HUB_POWER, "hub_power");