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arm: omap4: pandaboard: turn on PHY reference clock at init

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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 <tom.leiming@gmail.com>
Signed-off-by: Anand Gadiyar <gadiyar@ti.com>
Cc: Benoit Cousson <b-cousson@ti.com>
Reviewed-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Anand Gadiyar 2011-01-10 14:42:15 +00:00 committed by Tony Lindgren
parent 56a6a19dff
commit 1740d483ba
1 changed files with 10 additions and 0 deletions
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10
arch/arm/mach-omap2/board-omap4panda.c
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@ -19,6 +19,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/leds.h>
#include <linux/gpio.h>
@ -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");