rockchip: rk3288: Allow setting up clocks in U-Boot proper

If U-Boot is chain-loaded from a previous boot loader we must set up the
clocks the way U-Boot wants them. Add code for this. It will do nothing if
SPL has already done the job.

Signed-off-by: Simon Glass <sjg@chromium.org>

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

@@ -309,3 +309,38 @@ U_BOOT_CMD(
 	"display information about clocks",
 	""
 );
+
+#define GRF_SOC_CON2 0xff77024c
+
+int board_early_init_f(void)
+{
+	struct udevice *pinctrl;
+	struct udevice *dev;
+	int ret;
+
+	/*
+	 * This init is done in SPL, but when chain-loading U-Boot SPL will
+	 * have been skipped. Allow the clock driver to check if it needs
+	 * setting up.
+	 */
+	ret = rockchip_get_clk(&dev);
+	if (ret) {
+		debug("CLK init failed: %d\n", ret);
+		return ret;
+	}
+	ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
+	if (ret) {
+		debug("%s: Cannot find pinctrl device\n", __func__);
+		return ret;
+	}
+
+	/* Enable debug UART */
+	ret = pinctrl_request_noflags(pinctrl, PERIPH_ID_UART_DBG);
+	if (ret) {
+		debug("%s: Failed to set up console UART\n", __func__);
+		return ret;
+	}
+	rk_setreg(GRF_SOC_CON2, 1 << 0);
+
+	return 0;
+}

configs/chromebook_jerry_defconfig

@@ -10,6 +10,7 @@ CONFIG_SPL_STACK_R_ADDR=0x80000
 CONFIG_DEFAULT_DEVICE_TREE="rk3288-veyron-jerry"
 CONFIG_SILENT_CONSOLE=y
 # CONFIG_DISPLAY_CPUINFO is not set
+CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN=0x2000
 # CONFIG_CMD_IMLS is not set