usb: dwc3: of-simple: allow glues without clocks

Instead of erroring out when we don't have clocks,
let's just avoid any calls to the clk API.

Tested-by: Steven J. Hill <Steven.Hill@cavium.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
index ce9a070..ed6bbb3 100644 (file)
--- a/drivers/usb/dwc3/dwc3-of-simple.c
+++ b/drivers/usb/dwc3/dwc3-of-simple.c
@@ -36,36 +36,25 @@ struct dwc3_of_simple {
        int                     num_clocks;
 };
 
-static int dwc3_of_simple_probe(struct platform_device *pdev)
+static int dwc3_of_simple_clk_init(struct dwc3_of_simple *simple, int count)
 {
-       struct dwc3_of_simple   *simple;
-       struct device           *dev = &pdev->dev;
+       struct device           *dev = simple->dev;
        struct device_node      *np = dev->of_node;
-
-       unsigned int            count;
-       int                     ret;
        int                     i;
 
-       simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
-       if (!simple)
-               return -ENOMEM;
+       simple->num_clocks = count;
 
-       count = of_clk_get_parent_count(np);
        if (!count)
-               return -ENOENT;
-
-       simple->num_clocks = count;
+               return 0;
 
        simple->clks = devm_kcalloc(dev, simple->num_clocks,
                        sizeof(struct clk *), GFP_KERNEL);
        if (!simple->clks)
                return -ENOMEM;
 
-       platform_set_drvdata(pdev, simple);
-       simple->dev = dev;
-
        for (i = 0; i < simple->num_clocks; i++) {
                struct clk      *clk;
+               int             ret;
 
                clk = of_clk_get(np, i);
                if (IS_ERR(clk)) {
@@ -88,6 +77,29 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
                simple->clks[i] = clk;
        }
 
+       return 0;
+}
+
+static int dwc3_of_simple_probe(struct platform_device *pdev)
+{
+       struct dwc3_of_simple   *simple;
+       struct device           *dev = &pdev->dev;
+       struct device_node      *np = dev->of_node;
+
+       int                     ret;
+       int                     i;
+
+       simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
+       if (!simple)
+               return -ENOMEM;
+
+       platform_set_drvdata(pdev, simple);
+       simple->dev = dev;
+
+       ret = dwc3_of_simple_clk_init(simple, of_clk_get_parent_count(np));
+       if (ret)
+               return ret;
+
        ret = of_platform_populate(np, NULL, NULL, dev);
        if (ret) {
                for (i = 0; i < simple->num_clocks; i++) {