[PATCH v6 3/4] rockchip: rk3399: Add ROC-PC-PLUS board detection

[Fabio Estevam <festevam@gmail.com>]

From: Fabio Estevam <festevam@nabladev.com>

The ROC-RK3399-PC has an MP8859 regulator on I2C7 at address 0x66,
while the ROC-RK3399-PC-PLUS does not. Probe for the regulator in SPL
and use the result to select the matching devicetree from the U-Boot
FIT. Fall back to the original board if the I2C bus cannot be probed.

Build both devicetrees from the existing roc-pc-rk3399_defconfig and
enable the XMC SPI NOR driver used by the Plus variant. Set fdtfile
from the selected U-Boot devicetree so the matching Linux devicetree
is used as well.

Signed-off-by: Fabio Estevam <festevam@nabladev.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
---
Changes since v5:
- Fixed inadvertent inversion of dm_i2c_probe().

 arch/arm/dts/rk3399-roc-pc-u-boot.dtsi      |  8 ++++
 board/firefly/roc-pc-rk3399/roc-pc-rk3399.c | 42 +++++++++++++++++++++
 configs/roc-pc-rk3399_defconfig             |  3 ++
 doc/board/rockchip/rockchip.rst             |  2 +-
 4 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi b/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
index a85e9549c83..e7e4a2c8907 100644
--- a/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
@@ -12,6 +12,14 @@
 	};
 };
 
+&i2c7 {
+	bootph-pre-ram;
+};
+
+&i2c7_xfer {
+	bootph-pre-ram;
+};
+
 &gpio4 {
 	bootph-pre-ram;
 };
diff --git a/board/firefly/roc-pc-rk3399/roc-pc-rk3399.c b/board/firefly/roc-pc-rk3399/roc-pc-rk3399.c
index 6937a27176f..8f54e526c19 100644
--- a/board/firefly/roc-pc-rk3399/roc-pc-rk3399.c
+++ b/board/firefly/roc-pc-rk3399/roc-pc-rk3399.c
@@ -5,14 +5,24 @@
 
 #include <dm.h>
 #include <env.h>
+#include <fdtdec.h>
+#include <i2c.h>
+#include <image.h>
 #include <log.h>
 #include <spl_gpio.h>
+#include <asm/global_data.h>
 #include <asm/io.h>
 
 #include <asm/arch-rockchip/cru.h>
 #include <asm/arch-rockchip/gpio.h>
 #include <asm/arch-rockchip/grf_rk3399.h>
 
+#define ROC_PC_MP8859_BUS	"i2c@ff160000"
+#define ROC_PC_MP8859_ADDR	0x66
+#define ROC_PC_PLUS_FDTFILE	"rockchip/rk3399-roc-pc-plus.dtb"
+
+DECLARE_GLOBAL_DATA_PTR;
+
 #ifdef CONFIG_XPL_BUILD
 
 #define PMUGRF_BASE	0xff320000
@@ -54,4 +64,36 @@ void led_setup(void)
 	spl_gpio_output(gpio0, GPIO(BANK_B, 5), 1);
 }
 
+static bool is_roc_pc_plus(void)
+{
+	struct udevice *bus, *dev;
+
+	if (!(CONFIG_IS_ENABLED(I2C) && CONFIG_IS_ENABLED(DM_I2C)))
+		return false;
+
+	if (uclass_get_device_by_name(UCLASS_I2C, ROC_PC_MP8859_BUS, &bus))
+		return false;
+
+	return dm_i2c_probe(bus, ROC_PC_MP8859_ADDR, 0, &dev);
+}
+
+int board_fit_config_name_match(const char *name)
+{
+	if (is_roc_pc_plus())
+		return strcmp(name, ROC_PC_PLUS_FDTFILE);
+
+	return strcmp(name, CONFIG_DEFAULT_FDT_FILE);
+}
+
 #endif
+
+int rk_board_late_init(void)
+{
+	if (!fdt_node_check_compatible(gd->fdt_blob, 0,
+				       "firefly,roc-rk3399-pc-plus"))
+		env_set("fdtfile", ROC_PC_PLUS_FDTFILE);
+	else
+		env_set("fdtfile", CONFIG_DEFAULT_FDT_FILE);
+
+	return 0;
+}
diff --git a/configs/roc-pc-rk3399_defconfig b/configs/roc-pc-rk3399_defconfig
index 1df5cb03adb..53182dc8251 100644
--- a/configs/roc-pc-rk3399_defconfig
+++ b/configs/roc-pc-rk3399_defconfig
@@ -26,6 +26,7 @@ CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_SPL_MAX_SIZE=0x40000
 # CONFIG_SPL_RAW_IMAGE_SUPPORT is not set
 CONFIG_SPL_ENV_SUPPORT=y
+CONFIG_SPL_I2C=y
 CONFIG_SPL_SPI_LOAD=y
 CONFIG_SYS_SPI_U_BOOT_OFFS=0xE0000
 CONFIG_SPL_ATF_NO_PLATFORM_PARAM=y
@@ -37,6 +38,7 @@ CONFIG_CMD_USB=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_TIME=y
 CONFIG_SPL_OF_CONTROL=y
+CONFIG_OF_LIST="rockchip/rk3399-roc-pc rockchip/rk3399-roc-pc-plus"
 CONFIG_OF_SPL_REMOVE_PROPS="clock-names interrupt-parent assigned-clocks assigned-clock-rates assigned-clock-parents"
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_ENV_RELOC_GD_ENV_ADDR=y
@@ -49,6 +51,7 @@ CONFIG_MMC_SDHCI_SDMA=y
 CONFIG_MMC_SDHCI_ROCKCHIP=y
 CONFIG_SPI_FLASH_SFDP_SUPPORT=y
 CONFIG_SPI_FLASH_WINBOND=y
+CONFIG_SPI_FLASH_XMC=y
 CONFIG_DM_ETH_PHY=y
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_GMAC_ROCKCHIP=y
diff --git a/doc/board/rockchip/rockchip.rst b/doc/board/rockchip/rockchip.rst
index de2df3046e2..d9c4b753949 100644
--- a/doc/board/rockchip/rockchip.rst
+++ b/doc/board/rockchip/rockchip.rst
@@ -81,7 +81,7 @@ List of mainline supported Rockchip boards:
      - 96boards RK3399 Ficus (ficus-rk3399)
      - 96boards Rock960 (rock960-rk3399)
      - Firefly-RK3399 (firefly_rk3399)
-     - Firefly ROC-RK3399-PC
+     - Firefly ROC-RK3399-PC/ROC-RK3399-PC-PLUS (roc-pc-rk3399)
      - FriendlyElec NanoPC-T4 (nanopc-t4-rk3399)
      - FriendlyElec NanoPi M4 (nanopi-m4-rk3399)
      - FriendlyElec NanoPi M4B (nanopi-m4b-rk3399)
-- 
2.43.0