rockchip: rk3588-nanopc-t6: Add support for NanoPC-T6 LTS

Update defconfig to enable features included in pending upstream DT and
implement board_fit_config_name_match() to load correct DT for LTS and
non-LTS version of the NanoPC-T6.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/dts/rk3588-nanopc-t6-u-boot.dtsi

@@ -11,6 +11,11 @@
 	bootph-some-ram;
 };
 
+&saradc {
+	bootph-pre-ram;
+	vdd-microvolts = <1800000>;
+};
+
 &sfc {
 	flash@0 {
 		bootph-pre-ram;

board/friendlyelec/nanopc-t6-rk3588/Makefile

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0+
+
+obj-y += nanopc-t6-rk3588.o

board/friendlyelec/nanopc-t6-rk3588/nanopc-t6-rk3588.c

@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <adc.h>
+#include <env.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+
+#define HW_ID_CHANNEL	5
+
+struct board_model {
+	unsigned int low;
+	unsigned int high;
+	const char *fdtfile;
+};
+
+static const struct board_model board_models[] = {
+	{  348,  528, "rockchip/rk3588-nanopc-t6.dtb" },
+	{ 1957, 2137, "rockchip/rk3588-nanopc-t6-lts.dtb" },
+};
+
+static const struct board_model *get_board_model(void)
+{
+	unsigned int val;
+	int i, ret;
+
+	ret = adc_channel_single_shot("adc@fec10000", HW_ID_CHANNEL, &val);
+	if (ret)
+		return NULL;
+
+	for (i = 0; i < ARRAY_SIZE(board_models); i++) {
+		unsigned int min = board_models[i].low;
+		unsigned int max = board_models[i].high;
+
+		if (min <= val && val <= max)
+			return &board_models[i];
+	}
+
+	return NULL;
+}
+
+int rk_board_late_init(void)
+{
+	const struct board_model *model = get_board_model();
+
+	if (model)
+		env_set("fdtfile", model->fdtfile);
+
+	return 0;
+}
+
+int board_fit_config_name_match(const char *name)
+{
+	const struct board_model *model = get_board_model();
+
+	if (model && !strcmp(name, model->fdtfile))
+		return 0;
+
+	return -EINVAL;
+}

configs/nanopc-t6-rk3588_defconfig

@@ -32,6 +32,7 @@ CONFIG_SPL_PAD_TO=0x7f8000
 CONFIG_SPL_SPI_LOAD=y
 CONFIG_SYS_SPI_U_BOOT_OFFS=0x60000
 CONFIG_SPL_ATF=y
+CONFIG_CMD_ADC=y
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_GPT=y
 CONFIG_CMD_I2C=y
@@ -43,13 +44,20 @@ CONFIG_CMD_REGULATOR=y
 # CONFIG_SPL_DOS_PARTITION is not set
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_OF_LIVE=y
+CONFIG_OF_LIST="rockchip/rk3588-nanopc-t6 rockchip/rk3588-nanopc-t6-lts"
 CONFIG_OF_SPL_REMOVE_PROPS="clock-names interrupt-parent assigned-clocks assigned-clock-rates assigned-clock-parents"
+CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_SPL_DM_SEQ_ALIAS=y
 CONFIG_SPL_REGMAP=y
 CONFIG_SPL_SYSCON=y
+CONFIG_SPL_ADC=y
+CONFIG_BUTTON=y
+CONFIG_BUTTON_ADC=y
 CONFIG_SPL_CLK=y
 CONFIG_ROCKCHIP_GPIO=y
 CONFIG_SYS_I2C_ROCKCHIP=y
+CONFIG_LED=y
+CONFIG_LED_GPIO=y
 CONFIG_MISC=y
 CONFIG_SUPPORT_EMMC_RPMB=y
 CONFIG_MMC_DW=y
@@ -69,12 +77,16 @@ CONFIG_PHY_ROCKCHIP_INNO_USB2=y
 CONFIG_PHY_ROCKCHIP_NANENG_COMBOPHY=y
 CONFIG_PHY_ROCKCHIP_USBDP=y
 CONFIG_SPL_PINCTRL=y
+CONFIG_DM_PMIC=y
+CONFIG_PMIC_RK8XX=y
+CONFIG_REGULATOR_RK8XX=y
 CONFIG_PWM_ROCKCHIP=y
 CONFIG_SPL_RAM=y
 CONFIG_BAUDRATE=1500000
 CONFIG_DEBUG_UART_SHIFT=2
 CONFIG_SYS_NS16550_MEM32=y
 CONFIG_ROCKCHIP_SFC=y
+CONFIG_ROCKCHIP_SPI=y
 CONFIG_SYSRESET=y
 CONFIG_USB=y
 CONFIG_USB_XHCI_HCD=y