rockchip: clk: rk3399: add clk_enable function and support USB HOST0/1

The generic ehci-driver (ehci-generic.c) will try to enable the clocks
listed in the DTSI. If this fails (e.g. due to clk_enable not being
implemented in a driver and -ENOSYS being returned by the clk-uclass),
the driver will bail our and print an error message.

This implements a minimal clk_enable for the RK3399 and supports the
clocks mandatory for the EHCI controllers; as these are enabled by
default we simply return success.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/clk/rockchip/clk_rk3399.c b/drivers/clk/rockchip/clk_rk3399.c
index 723280672410a470ecb45b0026cf21c641a33cc7..168c9ddba3363427bcb5f571f446a2a4270a04fd 100644 (file)
--- a/drivers/clk/rockchip/clk_rk3399.c
+++ b/drivers/clk/rockchip/clk_rk3399.c
@@ -950,9 +950,24 @@ static ulong rk3399_clk_set_rate(struct clk *clk, ulong rate)
        return ret;
 }
 
+static int rk3399_clk_enable(struct clk *clk)
+{
+       switch (clk->id) {
+       case HCLK_HOST0:
+       case HCLK_HOST0_ARB:
+       case HCLK_HOST1:
+       case HCLK_HOST1_ARB:
+               return 0;
+       }
+
+       debug("%s: unsupported clk %ld\n", __func__, clk->id);
+       return -ENOENT;
+}
+
 static struct clk_ops rk3399_clk_ops = {
        .get_rate = rk3399_clk_get_rate,
        .set_rate = rk3399_clk_set_rate,
+       .enable = rk3399_clk_enable,
 };
 
 static int rk3399_clk_probe(struct udevice *dev)