[U-Boot] [RFC PATCH] rockchip: tinker: Add automatic board discovery

[Michael Trimarchi <michael@amarulasolutions.com>]

Add a way to detect board id and pcb id.

Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
---
 arch/arm/dts/rk3288-tinker.dtsi              | 33 ++++++++
 board/rockchip/tinker_rk3288/tinker-rk3288.c | 83 ++++++++++++++++++++
 2 files changed, 116 insertions(+)

diff --git a/arch/arm/dts/rk3288-tinker.dtsi b/arch/arm/dts/rk3288-tinker.dtsi
index 2f816af47f..67a0374050 100644
--- a/arch/arm/dts/rk3288-tinker.dtsi
+++ b/arch/arm/dts/rk3288-tinker.dtsi
@@ -53,6 +53,21 @@
 		#clock-cells = <0>;
 	};
 
+	board_info: board-info {
+		tinker,pcbid0 = <&gpio2 8 GPIO_ACTIVE_HIGH>;
+		tinker,pcbid1 = <&gpio2 9 GPIO_ACTIVE_HIGH>;
+		tinker,pcbid2 = <&gpio2 10 GPIO_ACTIVE_HIGH>;
+		tinker,pid0 = <&gpio2 1 GPIO_ACTIVE_HIGH>;
+		tinker,pid1 = <&gpio2 2 GPIO_ACTIVE_HIGH>;
+		tinker,pid2 = <&gpio2 3 GPIO_ACTIVE_HIGH>;
+	};
+
+	board_control: board-control {
+		tinker,sdp = <&gpio6 5 GPIO_ACTIVE_HIGH>;
+		tinker,usblimit = <&gpio6 6 GPIO_ACTIVE_HIGH>;
+		tinker,maskemmc = <&gpio6 7 GPIO_ACTIVE_HIGH>;
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";
 		autorepeat;
@@ -461,6 +476,10 @@
 };
 
 &pinctrl {
+	/* Pins that are not explicitely used by any devices */
+	pinctrl-names = "default";
+	pinctrl-0 = <&tinker_pin_hog>;
+
 	pcfg_pull_none_drv_8ma: pcfg-pull-none-drv-8ma {
 		drive-strength = <8>;
 	};
@@ -482,6 +501,20 @@
 		};
 	};
 
+	hog {
+		tinker_pin_hog: tinker-pin-hog {
+			rockchip,pins = <2 RK_PA1 RK_FUNC_GPIO &pcfg_pull_up>, /* project id 0 */
+					<2 RK_PA2 RK_FUNC_GPIO &pcfg_pull_up>, /* project id 1 */
+					<2 RK_PA3 RK_FUNC_GPIO &pcfg_pull_up>, /* project id 2 */
+					<2 RK_PB0 RK_FUNC_GPIO &pcfg_pull_none>, /* pcb id 0 */
+					<2 RK_PB1 RK_FUNC_GPIO &pcfg_pull_none>, /* pcb id 1 */
+					<2 RK_PB2 RK_FUNC_GPIO &pcfg_pull_none>, /* pcb id 2 */
+					<6 RK_PA5 RK_FUNC_GPIO &pcfg_pull_none>, /* sdp detect */
+					<6 RK_PA6 RK_FUNC_GPIO &pcfg_pull_up>, /* current limit */
+					<6 RK_PA7 RK_FUNC_GPIO &pcfg_pull_none>; /* emmc mask */
+		};
+	};
+
 	eth_phy {
 		eth_phy_pwr: eth-phy-pwr {
 			rockchip,pins = <0 6 RK_FUNC_GPIO &pcfg_pull_none>;
diff --git a/board/rockchip/tinker_rk3288/tinker-rk3288.c b/board/rockchip/tinker_rk3288/tinker-rk3288.c
index 7a0c3c997d..7c65521f55 100644
--- a/board/rockchip/tinker_rk3288/tinker-rk3288.c
+++ b/board/rockchip/tinker_rk3288/tinker-rk3288.c
@@ -5,12 +5,26 @@
 
 #include <common.h>
 #include <dm.h>
+#include <dm/device-internal.h>
+#include <asm/gpio.h>
+#include <dt-bindings/pinctrl/rockchip.h>
 #include <env.h>
 #include <i2c_eeprom.h>
 #include <netdev.h>
 #include <asm/arch-rockchip/bootrom.h>
 #include <asm/io.h>
 
+enum project_id {
+	tinker_board_s = 0,
+	tinker_board = 7,
+};
+
+enum pcb_id {
+	SR,
+	ER,
+	PR,
+};
+
 static int get_ethaddr_from_eeprom(u8 *addr)
 {
 	int ret;
@@ -23,10 +37,14 @@ static int get_ethaddr_from_eeprom(u8 *addr)
 	return i2c_eeprom_read(dev, 0, addr, 6);
 }
 
+int detect_board_init(void);
+
 int rk3288_board_late_init(void)
 {
 	u8 ethaddr[6];
 
+	detect_board_init();
+
 	if (get_ethaddr_from_eeprom(ethaddr))
 		return 0;
 
@@ -45,3 +63,68 @@ int mmc_get_env_dev(void)
 
 	return 1;
 }
+
+int detect_board_init(void)
+{
+	int ret = 0, i;
+	ofnode node;
+	struct udevice *gpio_dev2 = NULL;
+	struct udevice *gpio_dev6 = NULL;
+	struct gpio_desc pcbid[3];
+	struct gpio_desc pid[3];
+	enum project_id prjid;
+	char gpio_name[64];
+	enum pcb_id pcbversion;
+
+	debug("%s: detect boad\n", __func__);
+
+	if (uclass_get_device_by_name(UCLASS_GPIO, "gpio2 at ff790000", &gpio_dev2) ||
+	    uclass_get_device_by_name(UCLASS_GPIO, "gpio6 at ff7d0000", &gpio_dev6)) {
+		printf("Could not get GPIO device.\n");
+		return -EINVAL;
+	}
+
+	ret = device_probe(gpio_dev2);
+	if (ret)
+		pr_err("%s - probe failed: %d\n", gpio_dev2->name, ret);
+
+	ret = device_probe(gpio_dev6);
+	if (ret)
+		pr_err("%s - probe failed: %d\n", gpio_dev6->name, ret);
+
+	node = ofnode_path("/board-info");
+	if (!ofnode_valid(node)) {
+		pr_err("%s: no /board-info node?\n", __func__);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < 3; i++) {
+		snprintf(gpio_name, 64, "tinker,pid%d", i);
+		if (gpio_request_by_name_nodev(node, gpio_name, 0,
+					&pid[i], GPIOD_IS_IN)) {
+			printf("Failed to request %s\n", gpio_name);
+			continue;
+		}
+        }
+
+	for (i = 0; i < 3; i++) {
+		snprintf(gpio_name, 64, "tinker,pcbid%d", i);
+		if (gpio_request_by_name_nodev(node, gpio_name, 0,
+						&pcbid[i], GPIOD_IS_IN)) {
+			printf("Failed to request %s\n", gpio_name);
+			continue;
+		}
+        }
+
+	prjid = dm_gpio_get_value(&pid[0]) | \
+		dm_gpio_get_value(&pid[1]) << 1 | \
+		dm_gpio_get_value(&pid[2]) << 2;
+	pcbversion = dm_gpio_get_value(&pcbid[0]) | \
+		dm_gpio_get_value(&pcbid[1]) << 1 | \
+		dm_gpio_get_value(&pcbid[2]) << 2;
+
+	printf("Detect %s rev %d\n",
+		prjid == tinker_board ? "Tinker" : "Tinker S", pcbversion);
+
+	return ret;
+}
-- 
2.17.1