[U-Boot] [PATCH] usb: add clock support for generic EHCI

[Masahiro Yamada]

This driver is designed so generic that clock should also be handled
in a generic way.

Like the one in Linux (drivers/usb/host/ehci-platform.c), get and
enable clock(s) via Device Tree if present.

Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
---

This patch depends on new features that are still under review:

http://patchwork.ozlabs.org/patch/566809/
http://patchwork.ozlabs.org/patch/566812/

Please hold this one until they go in.


 drivers/usb/host/ehci-generic.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/usb/host/ehci-generic.c b/drivers/usb/host/ehci-generic.c
index 1292caa..44bf70b 100644
--- a/drivers/usb/host/ehci-generic.c
+++ b/drivers/usb/host/ehci-generic.c
@@ -5,9 +5,12 @@
  */
 
 #include <common.h>
+#include <clk.h>
 #include <dm.h>
 #include "ehci.h"
 
+#define EHCI_MAX_CLKS 3
+
 /*
  * Even though here we don't explicitly use "struct ehci_ctrl"
  * ehci_register() expects it to be the first thing that resides in
@@ -15,12 +18,24 @@
  */
 struct generic_ehci {
 	struct ehci_ctrl ctrl;
+	struct udevice *clk_devs[EHCI_MAX_CLKS];
+	int clk_ids[EHCI_MAX_CLKS];
 };
 
 static int ehci_usb_probe(struct udevice *dev)
 {
+	struct generic_ehci *priv = dev_get_priv(dev);
 	struct ehci_hccr *hccr = (struct ehci_hccr *)dev_get_addr(dev);
 	struct ehci_hcor *hcor;
+	int i;
+
+	for (i = 0; i < EHCI_MAX_CLKS; i++) {
+		priv->clk_ids[i] = fdt_clk_get(dev, i, &priv->clk_devs[i]);
+		if (priv->clk_ids[i] < 0)
+			break;
+		if (clk_enable(priv->clk_devs[i], priv->clk_ids[i]))
+			printf("failed to enable clock %d\n", priv->clk_ids[i]);
+	}
 
 	hcor = (struct ehci_hcor *)((uintptr_t)hccr +
 				    HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
-- 
1.9.1