board: asus: grouper: implement multi-DTB support

Use board revision detection mechanism to choose correct DTB.
Adjust documentation and build setup accordingly.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

board/asus/grouper/MAINTAINERS

@@ -2,6 +2,6 @@ GROUPER BOARD
 M:	Svyatoslav Ryhel <clamor95@gmail.com>
 S:	Maintained
 F:	board/asus/grouper/
-F:	configs/grouper_common_defconfig
-F:	doc/board/asus/grouper_common.rst
+F:	configs/grouper_defconfig
+F:	doc/board/asus/grouper.rst
 F:	include/configs/grouper.h

board/asus/grouper/Makefile

@@ -7,5 +7,6 @@
 #  Svyatoslav Ryhel <clamor95@gmail.com>
 
 obj-$(CONFIG_SPL_BUILD) += grouper-spl.o
+obj-$(CONFIG_MULTI_DTB_FIT) += board-info.o
 
 obj-y += grouper.o

board/asus/grouper/board-info.c

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  (C) Copyright 2024
+ *  Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#include <env.h>
+#include <spl_gpio.h>
+
+#include <asm/gpio.h>
+#include <asm/arch/pinmux.h>
+
+/*
+ *	PMIC_ID is GMI_CS2_N_PK3
+ *	MODEM_ID is GMI_CS4_N_PK2
+ *
+ *		Extended Project ID
+ *	====================================
+ *	MODEM_ID  PMIC_ID	project name
+ *	0	  0		grouper-E1565
+ *	0	  1		grouper-PM269
+ *	1	  0		tilapia
+ */
+enum project_rev {
+	E1565, PM269, TILAPIA, COUNT,
+};
+
+static const char * const project_id_to_fdt[] = {
+	[E1565] = "tegra30-asus-nexus7-grouper-E1565",
+	[PM269] = "tegra30-asus-nexus7-grouper-PM269",
+	[TILAPIA] = "tegra30-asus-nexus7-tilapia-E1565",
+};
+
+static int id_gpio_get_value(u32 pingrp, u32 pin)
+{
+	/* Configure pinmux */
+	pinmux_set_func(pingrp, PMUX_FUNC_GMI);
+	pinmux_set_pullupdown(pingrp, PMUX_PULL_DOWN);
+	pinmux_tristate_enable(pingrp);
+	pinmux_set_io(pingrp, PMUX_PIN_INPUT);
+
+	/*
+	 * Since this function may be called
+	 * during DM reload we should use SPL
+	 * GPIO functions which do not depend
+	 * on DM.
+	 */
+	spl_gpio_input(NULL, pin);
+	return spl_gpio_get_value(NULL, pin);
+}
+
+static int get_project_id(void)
+{
+	u32 pmic_id, modem_id, proj_id;
+
+	modem_id = id_gpio_get_value(PMUX_PINGRP_GMI_CS4_N_PK2,
+				     TEGRA_GPIO(K, 2));
+	pmic_id = id_gpio_get_value(PMUX_PINGRP_GMI_CS2_N_PK3,
+				    TEGRA_GPIO(K, 3));
+
+	proj_id = (modem_id << 1 | pmic_id) & COUNT;
+
+	log_debug("[GROUPER]: project id %d (%s)\n", proj_id,
+		  project_id_to_fdt[proj_id]);
+
+	return proj_id;
+}
+
+int board_fit_config_name_match(const char *name)
+{
+	if (!strcmp(name, project_id_to_fdt[get_project_id()]))
+		return 0;
+
+	return -1;
+}
+
+void nvidia_board_late_init(void)
+{
+	char dt_path[64] = { 0 };
+
+	snprintf(dt_path, sizeof(dt_path), "%s.dtb",
+		 project_id_to_fdt[get_project_id()]);
+	env_set("fdtfile", dt_path);
+}

board/asus/grouper/configs/grouper_E1565.config

-CONFIG_DEFAULT_DEVICE_TREE="tegra30-asus-nexus7-grouper-E1565"
-CONFIG_CMD_POWEROFF=y
-# CONFIG_MAX77663_GPIO is not set
-CONFIG_DM_PMIC_MAX77663=y
-CONFIG_DM_REGULATOR_MAX77663=y
-CONFIG_SYSRESET_MAX77663=y

board/asus/grouper/configs/grouper_PM269.config

-CONFIG_DEFAULT_DEVICE_TREE="tegra30-asus-nexus7-grouper-PM269"
-CONFIG_CMD_POWEROFF=y
-CONFIG_DM_PMIC_TPS65910=y
-# CONFIG_DM_REGULATOR_TPS65910 is not set
-CONFIG_DM_REGULATOR_TPS65911=y
-CONFIG_SYSRESET_TPS65910=y

board/asus/grouper/configs/tilapia.config

-CONFIG_DEFAULT_DEVICE_TREE="tegra30-asus-nexus7-tilapia-E1565"
-CONFIG_SYS_PROMPT="Tegra30 (Tilapia) # "
-CONFIG_CMD_POWEROFF=y
-# CONFIG_MAX77663_GPIO is not set
-CONFIG_DM_PMIC_MAX77663=y
-CONFIG_DM_REGULATOR_MAX77663=y
-CONFIG_SYSRESET_MAX77663=y

configs/grouper_common_defconfig → configs/grouper_defconfig

@@ -39,6 +39,7 @@ CONFIG_CMD_GPT=y
 CONFIG_CMD_GPT_RENAME=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
+CONFIG_CMD_POWEROFF=y
 CONFIG_CMD_USB=y
 CONFIG_CMD_USB_MASS_STORAGE=y
 CONFIG_CMD_UMS_ABORT_KEYED=y
@@ -48,6 +49,9 @@ CONFIG_CMD_REGULATOR=y
 CONFIG_CMD_EXT4_WRITE=y
 # CONFIG_SPL_DOS_PARTITION is not set
 # CONFIG_SPL_EFI_PARTITION is not set
+CONFIG_OF_LIST="tegra30-asus-nexus7-grouper-E1565 tegra30-asus-nexus7-grouper-PM269 tegra30-asus-nexus7-tilapia-E1565"
+CONFIG_DTB_RESELECT=y
+CONFIG_MULTI_DTB_FIT=y
 CONFIG_ENV_OVERWRITE=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_SYS_MMC_ENV_PART=2
@@ -62,10 +66,16 @@ CONFIG_GPIO_HOG=y
 CONFIG_SYS_I2C_TEGRA=y
 CONFIG_BUTTON_KEYBOARD=y
 CONFIG_DM_PMIC=y
+CONFIG_DM_PMIC_MAX77663=y
+CONFIG_DM_PMIC_TPS65910=y
 CONFIG_DM_REGULATOR=y
+CONFIG_DM_REGULATOR_MAX77663=y
 CONFIG_DM_REGULATOR_FIXED=y
+CONFIG_DM_REGULATOR_TPS65911=y
 CONFIG_PWM_TEGRA=y
 CONFIG_SYS_NS16550=y
+CONFIG_SYSRESET_MAX77663=y
+CONFIG_SYSRESET_TPS65910=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_EHCI_TEGRA=y

doc/board/asus/grouper_common.rst → doc/board/asus/grouper.rst

@@ -19,14 +19,14 @@ Quick Start
 Build U-Boot
 ------------
 
-Device support is implemented by applying config fragment to a generic board
-defconfig. Valid fragments are ``tilapia.config``, ``grouper_E1565.config``
-and ``grouper_PM269.config``.
+U-Boot features ability to detect grouper board revision on which it is
+loaded. Currently are supported both TI and MAXIM based WiFi-only models
+along with cellular one.
 
 .. code-block:: bash
 
     $ export CROSS_COMPILE=arm-linux-gnueabi-
-    $ make grouper_common_defconfig grouper_E1565.config # For maxim based grouper
+    $ make grouper_defconfig # For all grouper versions and tilapia
     $ make
 
 After the build succeeds, you will obtain the final ``u-boot-dtb-tegra.bin``

doc/board/asus/index.rst

@@ -6,6 +6,6 @@ ASUS
 .. toctree::
    :maxdepth: 2
 
-   grouper_common
+   grouper
    transformer_t20
    transformer_t30