[U-Boot] [PATCH v4 09/11] usb: host: ohci-generic: add CLOCK support

[patrice.chotard at st.com <patrice.chotard@st.com>]

From: Patrice Chotard <patrice.chotard@st.com>

use array to save enabled clocks reference in order to
disabled them in case of error during probe() or during
driver removal.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
---

v4:     _ use generic_phy_valid() before generic_phy_exit() call

v3:	_ extract in this patch the CLOCK support add-on from previous patch 5
	_ keep enabled clocks reference in list in order to 
	  disable clocks in error path or in .remove callback

v2:	_ add error path management
	_ add .remove callback

 drivers/usb/host/ohci-generic.c | 53 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 51 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/ohci-generic.c b/drivers/usb/host/ohci-generic.c
index f3307f4..404fc98 100644
--- a/drivers/usb/host/ohci-generic.c
+++ b/drivers/usb/host/ohci-generic.c
@@ -5,6 +5,7 @@
  */
 
 #include <common.h>
+#include <clk.h>
 #include <dm.h>
 #include "ohci.h"
 
@@ -14,18 +15,66 @@
 
 struct generic_ohci {
 	ohci_t ohci;
+	struct clk *clocks;
+	int clock_count;
 };
 
 static int ohci_usb_probe(struct udevice *dev)
 {
 	struct ohci_regs *regs = (struct ohci_regs *)dev_get_addr(dev);
+	struct generic_ohci *priv = dev_get_priv(dev);
+	int i, err, ret, clock_nb;
 
-	return ohci_register(dev, regs);
+	err = 0;
+	priv->clock_count = 0;
+	clock_nb = clk_count(dev);
+
+	if (clock_nb) {
+		priv->clocks = devm_kmalloc(dev, sizeof(struct clk) * clock_nb,
+					    GFP_KERNEL);
+		if (!priv->clocks) {
+			error("Can't allocate resource\n");
+			return -ENOMEM;
+		}
+
+		for (i = 0; i < clock_nb; i++) {
+			err = clk_get_by_index(dev, i, &priv->clocks[i]);
+			if (err < 0)
+				break;
+
+			priv->clock_count++;
+
+			if (clk_enable(&priv->clocks[i])) {
+				error("failed to enable clock %d\n", i);
+				clk_free(&priv->clocks[i]);
+				goto clk_err;
+			}
+			clk_free(&priv->clocks[i]);
+		}
+	}
+
+	err = ohci_register(dev, regs);
+	if (!err)
+		return err;
+
+clk_err:
+	ret = clk_disable_all(priv->clocks, priv->clock_count);
+	if (ret)
+		return ret;
+
+	return err;
 }
 
 static int ohci_usb_remove(struct udevice *dev)
 {
-	return ohci_deregister(dev);
+	struct generic_ohci *priv = dev_get_priv(dev);
+	int ret;
+
+	ret = ohci_deregister(dev);
+	if (ret)
+		return ret;
+
+	return clk_disable_all(priv->clocks, priv->clock_count);
 }
 
 static const struct udevice_id ohci_usb_ids[] = {
-- 
1.9.1