[U-Boot] [PATCH v5 09/11] usb: host: ohci-generic: add CLOCK support

[patrice.chotard]

From: Patrice Chotard <patrice.chot...@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.chot...@st.com>
Reviewed-by: Simon Glass <s...@chromium.org>
---
v5:     _ none

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 f85738f..3488a81 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 *)devfdt_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

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