From e1dcf7e7a3b5c0e76171ba0b7145af12693adcc4 Mon Sep 17 00:00:00 2001
From: Vincent Chen <vincent.chen@sifive.com>
Date: Wed, 3 May 2023 07:46:41 +0000
Subject: [PATCH 3/3] board: sifive: spl: Set remote thermal of TMP451 to 85
 deg C for the unmatched board

For TMP451 on the unmatched board, the default value of the remote
thermal threshold is 108 deg C. This commit initilizes it to 85 deg C at SPL.
---
 board/sifive/unmatched/spl.c       | 29 +++++++++++++++++++++++++++++
 configs/sifive_unmatched_defconfig |  3 +++
 drivers/misc/Kconfig               | 14 ++++++++++++++
 include/configs/sifive-unmatched.h |  4 ++++
 4 files changed, 50 insertions(+)

diff --git a/board/sifive/unmatched/spl.c b/board/sifive/unmatched/spl.c
index f3a661a8..05ba5916 100644
--- a/board/sifive/unmatched/spl.c
+++ b/board/sifive/unmatched/spl.c
@@ -10,6 +10,8 @@
 #include <spl.h>
 #include <misc.h>
 #include <log.h>
+#include <config.h>
+#include <i2c.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <asm/gpio.h>
@@ -26,6 +28,27 @@
 #define MODE_SELECT_SD		0xb
 #define MODE_SELECT_MASK	GENMASK(3, 0)
 
+#define TMP451_REMOTE_THERM_LIMIT_REG_OFFSET	0x19
+#define TMP451_REMOTE_THERM_LIMIT_INIT_VALUE	0x55
+
+static inline int init_tmp451_remote_therm_limit(void)
+{
+	struct udevice *dev;
+	unsigned char r_therm_limit = TMP451_REMOTE_THERM_LIMIT_INIT_VALUE;
+	int ret;
+
+	ret = i2c_get_chip_for_busnum(CONFIG_SYS_TMP451_BUS_NUM,
+				      CONFIG_SYS_I2C_TMP451_ADDR,
+				      CONFIG_SYS_I2C_TMP451_ADDR_LEN,
+				      &dev);
+
+	if (!ret)
+		ret = dm_i2c_write(dev, TMP451_REMOTE_THERM_LIMIT_REG_OFFSET,
+				   &r_therm_limit,
+				   sizeof(unsigned char));
+	return ret;
+}
+
 static inline int spl_reset_device_by_gpio(const char *label, int pin, int low_width)
 {
 	int ret;
@@ -92,6 +115,12 @@ int spl_board_init_f(void)
 
 	pwm_device_init();
 
+	ret = init_tmp451_remote_therm_limit();
+	if (ret) {
+		debug("TMP451 remote THERM limit init failed: %d\n", ret);
+		goto end;
+	}
+
 	ret = spl_gemgxl_init();
 	if (ret) {
 		debug("Gigabit ethernet PHY (VSC8541) init failed: %d\n", ret);
diff --git a/configs/sifive_unmatched_defconfig b/configs/sifive_unmatched_defconfig
index 74cdb4ea..e843378c 100644
--- a/configs/sifive_unmatched_defconfig
+++ b/configs/sifive_unmatched_defconfig
@@ -68,3 +68,6 @@ CONFIG_SYSRESET=y
 CONFIG_SYSRESET_SBI=y
 CONFIG_CMD_POWEROFF=y
 CONFIG_SYSRESET_CMD_POWEROFF=y
+CONFIG_SYS_TMP451_BUS_NUM=0
+CONFIG_SYS_I2C_TMP451_ADDR=0x4c
+CONFIG_SYS_I2C_TMP451_ADDR_LEN=1
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index b5707a15..8ea6f014 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -552,6 +552,20 @@ config SYS_I2C_EEPROM_ADDR
 
 if I2C_EEPROM
 
+config SYS_TMP451_BUS_NUM
+	int "Bus number of TMP451 device"
+	default 0
+
+config SYS_I2C_TMP451_ADDR
+	hex "Chip address of the TMP451 device"
+	default 0
+
+config SYS_I2C_TMP451_ADDR_LEN
+	int "Length in bytes of the TMP451 memory array address"
+	default 1
+	help
+	  Note: This is NOT the chip address length!
+
 config SYS_I2C_EEPROM_ADDR_OVERFLOW
 	hex "EEPROM Address Overflow"
 	default 0x0
diff --git a/include/configs/sifive-unmatched.h b/include/configs/sifive-unmatched.h
index 74150b7d..6a8eb1e6 100644
--- a/include/configs/sifive-unmatched.h
+++ b/include/configs/sifive-unmatched.h
@@ -13,6 +13,10 @@
 
 #define CFG_SYS_SDRAM_BASE		0x80000000
 
+#define CONFIG_SYS_TMP451_BUS_NUM	0
+#define CONFIG_SYS_I2C_TMP451_ADDR	0x4c
+#define CONFIG_SYS_I2C_TMP451_ADDR_LEN	0x1
+
 /* Environment options */
 
 #define BOOT_TARGET_DEVICES(func) \
-- 
2.40.1