usb: host: fotg2: add silicon clock handling

When used in a system with software-controlled silicon clocks,
the FOTG210 needs to grab, prepare and enable the clock.

This is needed on for example the Cortina Gemini, where the
platform will by default gate off the clock unless the
peripheral (in this case the USB driver) grabs and enables
the clock.

If there is no clock available on the platform, we live
without it. Make sure to percolate probe deferrals.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 32 insertions, 4 deletions

diff --git a/drivers/usb/host/fotg210-hcd.c b/drivers/usb/host/fotg210-hcd.c
index e64eb47770c8..058ff82ea789 100644
--- a/drivers/usb/host/fotg210-hcd.c
+++ b/drivers/usb/host/fotg210-hcd.c
@@ -31,6 +31,7 @@
 #include <linux/uaccess.h>
 #include <linux/platform_device.h>
 #include <linux/io.h>
+#include <linux/clk.h>
 
 #include <asm/byteorder.h>
 #include <asm/irq.h>
@@ -5596,7 +5597,7 @@ static int fotg210_hcd_probe(struct platform_device *pdev)
         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
         if (IS_ERR(hcd->regs)) {
                 retval = PTR_ERR(hcd->regs);
-                goto failed;
+                goto failed_put_hcd;
         }
 
         hcd->rsrc_start = res->start;
@@ -5606,22 +5607,42 @@ static int fotg210_hcd_probe(struct platform_device *pdev)
 
         fotg210->caps = hcd->regs;
 
+        /* It's OK not to supply this clock */
+        fotg210->pclk = clk_get(dev, "PCLK");
+        if (!IS_ERR(fotg210->pclk)) {
+                retval = clk_prepare_enable(fotg210->pclk);
+                if (retval) {
+                        dev_err(dev, "failed to enable PCLK\n");
+                        goto failed_put_hcd;
+                }
+        } else if (PTR_ERR(fotg210->pclk) == -EPROBE_DEFER) {
+                /*
+                 * Percolate deferrals, for anything else,
+                 * just live without the clocking.
+                 */
+                retval = PTR_ERR(fotg210->pclk);
+                goto failed_dis_clk;
+        }
+
         retval = fotg210_setup(hcd);
         if (retval)
-                goto failed;
+                goto failed_dis_clk;
 
         fotg210_init(fotg210);
 
         retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
         if (retval) {
                 dev_err(dev, "failed to add hcd with err %d\n", retval);
-                goto failed;
+                goto failed_dis_clk;
         }
         device_wakeup_enable(hcd->self.controller);
 
         return retval;
 
-failed:
+failed_dis_clk:
+        if (!IS_ERR(fotg210->pclk))
+                clk_disable_unprepare(fotg210->pclk);
+failed_put_hcd:
         usb_put_hcd(hcd);
 fail_create_hcd:
         dev_err(dev, "init %s fail, %d\n", dev_name(dev), retval);
@@ -5637,6 +5658,10 @@ static int fotg210_hcd_remove(struct platform_device *pdev)
 {
         struct device *dev = &pdev->dev;
         struct usb_hcd *hcd = dev_get_drvdata(dev);
+        struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
+
+        if (!IS_ERR(fotg210->pclk))
+                clk_disable_unprepare(fotg210->pclk);
 
         if (!hcd)
                 return 0;
diff --git a/drivers/usb/host/fotg210.h b/drivers/usb/host/fotg210.h
index 7fcd785c7bc8..28f6467c0cbf 100644
--- a/drivers/usb/host/fotg210.h
+++ b/drivers/usb/host/fotg210.h
@@ -182,6 +182,9 @@ struct fotg210_hcd {			/* one per controller */
 #       define COUNT(x)
 #endif
 
+        /* silicon clock */
+        struct clk              *pclk;
+
         /* debug files */
         struct dentry           *debug_dir;
 };