rockchip: clk: rk3399: handle clk_enable requests for GMAC

Since commit ba1f96672522 ("net: designware: add clock support"), the
designware GMAC driver enables all referenced clocks. While this is a
no-op for the RK3399 during boot-up (reset behaviour has all the clock
gates open anyway), we still need to handle the clock-ids passed in
the enable op of the clock-driver and return a success.

This change extends the enable-op of the rk3399 clk driver to signal
success to the caller when the clocks for the GMAC are enabled.

References: commit ba1f96672522 ("net: designware: add clock support")
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/clk/rockchip/clk_rk3399.c b/drivers/clk/rockchip/clk_rk3399.c
index 42926ba323..8822d3a9a8 100644
--- a/drivers/clk/rockchip/clk_rk3399.c
+++ b/drivers/clk/rockchip/clk_rk3399.c
@@ -997,6 +997,16 @@ static int rk3399_clk_enable(struct clk *clk)
 	case HCLK_HOST1:
 	case HCLK_HOST1_ARB:
 		return 0;
+
+	case SCLK_MAC:
+	case SCLK_MAC_RX:
+	case SCLK_MAC_TX:
+	case SCLK_MACREF:
+	case SCLK_MACREF_OUT:
+	case ACLK_GMAC:
+	case PCLK_GMAC:
+		/* Required to successfully probe the Designware GMAC driver */
+		return 0;
 	}
 
 	debug("%s: unsupported clk %ld\n", __func__, clk->id);