clk: boston: Allow to get regmap from parent device

In upstream devicetree, clk_boston is a child of syscon node
and there is no "regmap" property for clk_boston node.

Try to check parent device first to look for syscon.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

diff --git a/drivers/clk/clk_boston.c b/drivers/clk/clk_boston.c
index 030ff7c..71e030f 100644 (file)
--- a/drivers/clk/clk_boston.c
+++ b/drivers/clk/clk_boston.c
@@ -58,17 +58,21 @@ const struct clk_ops clk_boston_ops = {
        .get_rate = clk_boston_get_rate,
 };
 
-static int clk_boston_of_to_plat(struct udevice *dev)
+static int clk_boston_probe(struct udevice *dev)
 {
        struct clk_boston *state = dev_get_plat(dev);
        struct udevice *syscon;
        int err;
 
-       err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
-                                          "regmap", &syscon);
-       if (err) {
-               pr_err("unable to find syscon device\n");
-               return err;
+       if (dev->parent && device_get_uclass_id(dev->parent) == UCLASS_SYSCON) {
+               syscon = dev->parent;
+       } else {
+               err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
+                                                  "regmap", &syscon);
+               if (err) {
+                       pr_err("unable to find syscon device\n");
+                       return err;
+               }
        }
 
        state->regmap = syscon_get_regmap(syscon);
@@ -91,7 +95,8 @@ U_BOOT_DRIVER(clk_boston) = {
        .name = "boston_clock",
        .id = UCLASS_CLK,
        .of_match = clk_boston_match,
-       .of_to_plat = clk_boston_of_to_plat,
+       .probe = clk_boston_probe,
        .plat_auto      = sizeof(struct clk_boston),
        .ops = &clk_boston_ops,
+       .flags = DM_FLAG_PRE_RELOC,
 };