[PATCH 2/3] arm: mach-k3: am62a: Fixup thermal zone critical points

[Aparna Patra]

Read the max temperature for the SoC temperature grade from the hardware
and modify the critical trip nodes on each thermal zone of FDT at
runtime so they are correct with the hardware value for its grade.

Signed-off-by: Aparna Patra <a-patra at ti.com>
---
 arch/arm/mach-k3/am62ax/am62a7_fdt.c          | 37 +++++++++++++++++++
 .../arm/mach-k3/include/mach/am62a_hardware.h | 18 +++++++++
 2 files changed, 55 insertions(+)

diff --git a/arch/arm/mach-k3/am62ax/am62a7_fdt.c b/arch/arm/mach-k3/am62ax/am62a7_fdt.c
index 56fd658202..40833ca392 100644
--- a/arch/arm/mach-k3/am62ax/am62a7_fdt.c
+++ b/arch/arm/mach-k3/am62ax/am62a7_fdt.c
@@ -45,12 +45,49 @@ static void fdt_fixup_canfd_nodes_am62a(void *blob, bool has_canfd)
 		fdt_del_node_path(blob, "/bus at f0000/can at 20701000");
 }
 
+static int fdt_fixup_trips_node(void *blob, int zoneoffset, int maxc)
+{
+	int node, trip;
+
+	node = fdt_subnode_offset(blob, zoneoffset, "trips");
+	if (node < 0)
+		return -1;
+
+	fdt_for_each_subnode(trip, blob, node) {
+		const char *type = fdt_getprop(blob, trip, "type", NULL);
+
+		if (!type || (strncmp(type, "critical", 8) != 0))
+			continue;
+
+		if (fdt_setprop_u32(blob, trip, "temperature", 1000 * maxc) < 0)
+			return -1;
+	}
+
+	return 0;
+}
+
+static void fdt_fixup_thermal_zone_nodes_am62a(void *blob, int maxc)
+{
+	int node, zone;
+
+	node = fdt_path_offset(blob, "/thermal-zones");
+	if (node < 0)
+		return;
+
+	fdt_for_each_subnode(zone, blob, node) {
+		if (fdt_fixup_trips_node(blob, zone, maxc) < 0)
+			printf("Failed to set temperature in %s critical trips\n",
+			       fdt_get_name(blob, zone, NULL));
+	}
+}
+
 int ft_system_setup(void *blob, struct bd_info *bd)
 {
 	fdt_fixup_cores_wdt_nodes_am62a(blob, k3_get_core_nr());
 	fdt_fixup_dss_nodes_am62a(blob, k3_has_dss());
 	fdt_fixup_video_codec_nodes_am62a(blob, k3_has_video_codec());
 	fdt_fixup_canfd_nodes_am62a(blob, k3_has_canfd());
+	fdt_fixup_thermal_zone_nodes_am62a(blob, k3_get_max_temp());
 	fdt_fixup_reserved(blob, "tfa", CONFIG_K3_ATF_LOAD_ADDR, 0x80000);
 	fdt_fixup_reserved(blob, "optee", CONFIG_K3_OPTEE_LOAD_ADDR, 0x1800000);
 
diff --git a/arch/arm/mach-k3/include/mach/am62a_hardware.h b/arch/arm/mach-k3/include/mach/am62a_hardware.h
index ab281129d7..0ec04a72f5 100644
--- a/arch/arm/mach-k3/include/mach/am62a_hardware.h
+++ b/arch/arm/mach-k3/include/mach/am62a_hardware.h
@@ -28,8 +28,14 @@
 #define JTAG_DEV_VIDEO_CODEC_SHIFT			14
 #define JTAG_DEV_DSS_MASK			GENMASK(16, 13)
 #define JTAG_DEV_DSS_SHIFT			13
+#define JTAG_DEV_TEMP_MASK			GENMASK(5, 3)
+#define JTAG_DEV_TEMP_SHIFT			3
 
 #define JTAG_DEV_HAS_DSS_VALUE			0xD
+#define JTAG_DEV_TEMP_AUTOMOTIVE        0x5
+
+#define JTAG_DEV_TEMP_EXTENDED_VALUE    105
+#define JTAG_DEV_TEMP_AUTOMOTIVE_VALUE  125
 
 #define CTRLMMR_MAIN_DEVSTAT			(WKUP_CTRL_MMR0_BASE + 0x30)
 #define MAIN_DEVSTAT_PRIMARY_BOOTMODE_MASK	GENMASK(6, 3)
@@ -126,6 +132,18 @@ static inline int k3_has_canfd(void)
 	return (dev_id & JTAG_DEV_CANFD_MASK) >> JTAG_DEV_CANFD_SHIFT;
 }
 
+static inline int k3_get_max_temp(void)
+{
+	u32 dev_id = readl(CTRLMMR_WKUP_JTAG_DEVICE_ID);
+
+	u32 dev_temp = (dev_id & JTAG_DEV_TEMP_MASK) >> JTAG_DEV_TEMP_SHIFT;
+
+	if (dev_temp == JTAG_DEV_TEMP_AUTOMOTIVE)
+		return JTAG_DEV_TEMP_AUTOMOTIVE_VALUE;
+	else
+		return JTAG_DEV_TEMP_EXTENDED_VALUE;
+}
+
 #if defined(CONFIG_SYS_K3_SPL_ATF) && !defined(__ASSEMBLY__)
 
 static const u32 put_device_ids[] = {};
-- 
2.34.1