[PATCH v1 2/2] arm: mach-k3: am62: Fixup thermal zone critical points

[Francesco Dolcini]

From: Joao Paulo Goncalves <joao.goncalves at toradex.com>

Read the max temperature for the SoC temperature grade from the hardware
and change 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: Joao Paulo Goncalves <joao.goncalves at toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini at toradex.com>
---
 arch/arm/mach-k3/am625_fdt.c | 37 ++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/arch/arm/mach-k3/am625_fdt.c b/arch/arm/mach-k3/am625_fdt.c
index 970dd3447dec..3c46d1028fd0 100644
--- a/arch/arm/mach-k3/am625_fdt.c
+++ b/arch/arm/mach-k3/am625_fdt.c
@@ -38,11 +38,48 @@ static void fdt_fixup_pru_node_am625(void *blob, int has_pru)
 		fdt_del_node_path(blob, "/bus at f0000/pruss at 30040000");
 }
 
+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_am625(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_nodes_am625(blob, k3_get_core_nr());
 	fdt_fixup_gpu_nodes_am625(blob, k3_has_gpu());
 	fdt_fixup_pru_node_am625(blob, k3_has_pru());
+	fdt_fixup_thermal_zone_nodes_am625(blob, k3_get_max_temp());
 
 	return 0;
 }
-- 
2.39.2