USB3503 chip supports 8 values of reference clock. The value is
specified by REF_SEL[1:0] pins and INT_N line. This patch add support
for getting 'refclk' clock, enabling it and setting INT_N line according
to the value of the gathered clock. If no clock has been specified,
driver defaults to the old behaviour (assuming that clock has been
specified by REF_SEL pins from primary reference clock frequencies
table).
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/usb/misc/usb3503.c | 28 ++++++++++++++++++++++++++--
1 file changed, 26 insertions(+), 2 deletions(-)
Hello,
This extension to USB3503 driver is needed to add support for OdroidU3
board, which uses 24MHz reference clock, sourced directly from CLKOUT
line from Exynos4412 SoC.
Best regards
Marek Szyprowski
Samsung R&D Institute Poland
diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c
index a31641e18d19..52cb7549b775 100644
--- a/drivers/usb/misc/usb3503.c
+++ b/drivers/usb/misc/usb3503.c
@@ -18,6 +18,7 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <linux/clk.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/delay.h>
@@ -57,10 +58,12 @@ struct usb3503 {
enum usb3503_mode mode;
struct regmap *regmap;
struct device *dev;
+ struct clk *clk;
u8 port_off_mask;
int gpio_intn;
int gpio_reset;
int gpio_connect;
+ bool secondary_ref_clk;
};
static int usb3503_reset(struct usb3503 *hub, int state)
@@ -186,6 +189,25 @@ static int usb3503_probe(struct usb3503 *hub)
} else if (np) {
hub->port_off_mask = 0;
+ hub->clk = devm_clk_get(dev, "refclk");
+ if (!IS_ERR(hub->clk)) {
+ unsigned long rate;
+
+ clk_prepare_enable(hub->clk);
+ rate = clk_get_rate(hub->clk);
+
+ if (rate == 38400000 || rate == 26000000 ||
+ rate == 19200000 || rate == 12000000)
+ hub->secondary_ref_clk = 0;
+ else if (rate == 24000000 || rate == 27000000 ||
+ rate == 25000000 || rate == 50000000)
+ hub->secondary_ref_clk = 1;
+ else
+ dev_err(dev,
+ "unsupported reference clock rate (%d)\n",
+ rate);
+ }
+
property = of_get_property(np, "disabled-ports", &len);
if (property && (len / sizeof(u32)) > 0) {
int i;
@@ -213,8 +235,10 @@ static int usb3503_probe(struct usb3503 *hub)
dev_err(dev, "Ports disabled with no control interface\n");
if (gpio_is_valid(hub->gpio_intn)) {
- err = devm_gpio_request_one(dev, hub->gpio_intn,
- GPIOF_OUT_INIT_HIGH, "usb3503 intn");
+ int val = hub->secondary_ref_clk ? GPIOF_OUT_INIT_LOW :
+ GPIOF_OUT_INIT_HIGH;
+ err = devm_gpio_request_one(dev, hub->gpio_intn, val,
+ "usb3503 intn");
if (err) {
dev_err(dev,
"unable to request GPIO %d as connect pin (%d)\n",
--
1.9.2
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