[PATCH 3/4] arm: mach-k3: am62p: fixup thermal cooling device by cpu number

[João Paulo Gonçalves]

From: João Paulo Gonçalves <joao.goncalves at toradex.com>

TI AM62Px devices support CPU throttling based on thermal alerts.
However, the device tree assumes a 4-core configuration. Since the AM62P
also supports 2-core configurations, add a fixup to dynamically adjust
the cooling-device nodes within thermal zones based on the actual number
of CPU cores available.

Signed-off-by: João Paulo Gonçalves <joao.goncalves at toradex.com>
---
 arch/arm/mach-k3/am62px/am62p5_fdt.c | 37 ++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/arch/arm/mach-k3/am62px/am62p5_fdt.c b/arch/arm/mach-k3/am62px/am62p5_fdt.c
index 4d8061354c84c0f429d2ad0447bcdc2aea4d1004..4a5ff594df66878368777cd7aa79b3adf0a094e1 100644
--- a/arch/arm/mach-k3/am62px/am62p5_fdt.c
+++ b/arch/arm/mach-k3/am62px/am62p5_fdt.c
@@ -6,6 +6,7 @@
 #include <asm/arch/k3-common-fdt.h>
 #include <asm/hardware.h>
 #include <fdt_support.h>
+#include <fdtdec.h>
 
 static void fdt_fixup_cores_wdt_nodes_am62p(void *blob, int core_nr)
 {
@@ -49,12 +50,48 @@ static void fdt_fixup_cpu_freq_nodes_am62p(void *blob, int max_freq)
 	}
 }
 
+static void fdt_fixup_thermal_cooling_device_cpus_am62p(void *blob, int core_nr)
+{
+	static const char * const thermal_path[] = {
+		"/thermal-zones/main0-thermal/cooling-maps/map0",
+		"/thermal-zones/main1-thermal/cooling-maps/map0",
+		"/thermal-zones/main2-thermal/cooling-maps/map0"
+	};
+
+	int node, cnt, i, ret;
+	u32 cooling_dev[12];
+
+	for (i = 0; i < ARRAY_SIZE(thermal_path); i++) {
+		int new_count = core_nr * 3;  /* Each CPU has 3 entries */
+		int j;
+
+		node = fdt_path_offset(blob, thermal_path[i]);
+		if (node < 0)
+			continue;
+
+		cnt = fdtdec_get_int_array_count(blob, node, "cooling-device",
+						 cooling_dev, ARRAY_SIZE(cooling_dev));
+		if (cnt < 0)
+			continue;
+
+		for (j = 0; j < new_count; j++)
+			cooling_dev[j] = cpu_to_fdt32(cooling_dev[j]);
+
+		ret = fdt_setprop(blob, node, "cooling-device", cooling_dev,
+				  new_count * sizeof(u32));
+		if (ret < 0)
+			printf("Error %s, cooling-device setprop failed %d\n",
+			       thermal_path[i], ret);
+	}
+}
+
 int ft_system_setup(void *blob, struct bd_info *bd)
 {
 	fdt_fixup_cores_wdt_nodes_am62p(blob, k3_get_core_nr());
 	fdt_fixup_video_codec_nodes_am62p(blob, k3_has_video_codec());
 	fdt_fixup_canfd_nodes_am62p(blob, k3_has_canfd());
 	fdt_fixup_thermal_critical_trips_k3(blob, k3_get_max_temp());
+	fdt_fixup_thermal_cooling_device_cpus_am62p(blob, k3_get_core_nr());
 	fdt_fixup_cpu_freq_nodes_am62p(blob, k3_get_a53_max_frequency());
 	fdt_fixup_reserved(blob, "tfa", CONFIG_K3_ATF_LOAD_ADDR, 0x80000);
 	fdt_fixup_reserved(blob, "optee", CONFIG_K3_OPTEE_LOAD_ADDR, 0x1800000);

-- 
2.43.0