rockchip: Use rockchip_get_clk() to obtain the SoC clock

The current code picks the first available clock. In U-Boot proper this is
the oscillator device, not the SoC clock device. As a result the HDMI display
does not work.

Fix this by calling rockchip_get_clk() instead.

Fixes: 135aa950 (clk: convert API to match reset/mailbox style)
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Anatolij Gustschin <agust@denx.de>

arch/arm/mach-rockchip/board.c

@@ -178,7 +178,7 @@ static int do_clock(cmd_tbl_t *cmdtp, int flag, int argc,
 	int ret, i;
 	struct udevice *dev;
 
-	ret = uclass_get_device(UCLASS_CLK, 0, &dev);
+	ret = rockchip_get_clk(&dev);
 	if (ret) {
 		printf("clk-uclass not found\n");
 		return 0;

arch/arm/mach-rockchip/rk3288-board-spl.c

@@ -187,7 +187,7 @@ void board_init_f(ulong dummy)
 	rockchip_timer_init();
 	configure_l2ctlr();
 
-	ret = uclass_get_device(UCLASS_CLK, 0, &dev);
+	ret = rockchip_get_clk(&dev);
 	if (ret) {
 		debug("CLK init failed: %d\n", ret);
 		return;

arch/arm/mach-rockchip/rk3288/sdram_rk3288.c

@@ -923,7 +923,7 @@ static int rk3288_dmc_probe(struct udevice *dev)
 	priv->chan[1].pctl = regmap_get_range(plat->map, 2);
 	priv->chan[1].publ = regmap_get_range(plat->map, 3);
 #endif
-	ret = uclass_get_device(UCLASS_CLK, 0, &dev_clk);
+	ret = rockchip_get_clk(&dev_clk);
 	if (ret)
 		return ret;
 	priv->ddr_clk.id = CLK_DDR;

drivers/clk/clk_rk3288.c

@@ -145,7 +145,7 @@ void *rockchip_get_cru(void)
 	struct udevice *dev;
 	int ret;
 
-	ret = uclass_get_device(UCLASS_CLK, 0, &dev);
+	ret = rockchip_get_clk(&dev);
 	if (ret)
 		return ERR_PTR(ret);
 

drivers/video/rockchip/rk_vop.c

@@ -238,7 +238,7 @@ int rk_display_init(struct udevice *dev, ulong fbbase,
 		return ret;
 	}
 
-	ret = uclass_get_device(UCLASS_CLK, 0, &dev_clk);
+	ret = rockchip_get_clk(&dev_clk);
 	if (!ret) {
 		clk.id = DCLK_VOP0 + remote_vop_id;
 		ret = clk_request(dev_clk, &clk);