From: Maurus Cuelenaere <mcuelenaere@xxxxxxxxx>
The PLL that drives the USB clock supports 3 input clocks: 12, 24 and 48Mhz.
This patch adds support to the USB driver for setting the correct register bit
according to the given clock.
This depends on the following patch:
[PATCH] ARM: S3C64XX: Add USB external clock definition
Signed-off-by: Maurus Cuelenaere <mcuelenaere@xxxxxxxxx>
Signed-off-by: Ben Dooks <ben-linux@xxxxxxxxx>
---
drivers/usb/gadget/s3c-hsotg.c | 19 +++++++++++++++++++
1 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index 26193ec..6a303ce 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -23,6 +23,7 @@
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>
+#include <linux/clk.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
@@ -2753,6 +2754,7 @@ static void __devinit s3c_hsotg_initep(struct s3c_hsotg *hsotg,
*/
static void s3c_hsotg_otgreset(struct s3c_hsotg *hsotg)
{
+ struct clk *xusbxti;
u32 osc;
writel(0, S3C_PHYPWR);
@@ -2760,6 +2762,23 @@ static void s3c_hsotg_otgreset(struct s3c_hsotg *hsotg)
osc = hsotg->plat->is_osc ? S3C_PHYCLK_EXT_OSC : 0;
+ xusbxti = clk_get(hsotg->dev, "xusbxti");
+ if (xusbxti && !IS_ERR(xusbxti)) {
+ switch (clk_get_rate(xusbxti)) {
+ case 12000000:
+ osc |= S3C_PHYCLK_CLKSEL_12M;
+ break;
+ case 24000000:
+ osc |= S3C_PHYCLK_CLKSEL_24M;
+ break;
+ default:
+ case 48000000:
+ /* default reference clock */
+ break;
+ }
+ clk_put(xusbxti);
+ }
+
writel(osc | 0x10, S3C_PHYCLK);
/* issue a full set of resets to the otg and core */
--
1.7.0.4
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