[PATCH 5/9] thermal/drivers/mediatek/lvts_thermal: add MT8186 support

[Nicolas Pitre <nico@fluxnic.net>]

From: Nicolas Pitre <npitre@baylibre.com>

Various values extracted from the vendor's kernel driver.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
---
 .../thermal/mediatek,lvts-thermal.yaml        |  2 +
 arch/arm64/boot/dts/mediatek/mt8186.dtsi      | 20 ++++++
 drivers/thermal/mediatek/lvts_thermal.c       | 67 +++++++++++++++++++
 .../thermal/mediatek,lvts-thermal.h           | 10 +++
 4 files changed, 99 insertions(+)

diff --git a/Documentation/devicetree/bindings/thermal/mediatek,lvts-thermal.yaml b/Documentation/devicetree/bindings/thermal/mediatek,lvts-thermal.yaml
index e6665af52e..4173bae530 100644
--- a/Documentation/devicetree/bindings/thermal/mediatek,lvts-thermal.yaml
+++ b/Documentation/devicetree/bindings/thermal/mediatek,lvts-thermal.yaml
@@ -19,6 +19,7 @@ properties:
   compatible:
     enum:
       - mediatek,mt7988-lvts-ap
+      - mediatek,mt8186-lvts
       - mediatek,mt8192-lvts-ap
       - mediatek,mt8192-lvts-mcu
       - mediatek,mt8195-lvts-ap
@@ -75,6 +76,7 @@ allOf:
         compatible:
           contains:
             enum:
+              - mediatek,mt8186-lvts
               - mediatek,mt8195-lvts-ap
               - mediatek,mt8195-lvts-mcu
     then:
diff --git a/arch/arm64/boot/dts/mediatek/mt8186.dtsi b/arch/arm64/boot/dts/mediatek/mt8186.dtsi
index df0c04f2ba..8fc563dce6 100644
--- a/arch/arm64/boot/dts/mediatek/mt8186.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8186.dtsi
@@ -1355,6 +1355,18 @@ spi0: spi@1100a000 {
 			status = "disabled";
 		};
 
+		lvts: lvts@1100b000 {
+			compatible = "mediatek,mt8186-lvts";
+			#thermal-sensor-cells = <1>;
+			reg = <0 0x1100b000 0 0x1000>;
+			interrupts = <GIC_SPI 99 IRQ_TYPE_LEVEL_HIGH 0>;
+			clocks = <&infracfg_ao CLK_INFRA_AO_THERM>;
+			clock-names = "lvts_clk";
+			resets = <&infracfg_ao MT8186_INFRA_THERMAL_CTRL_RST>;
+			nvmem-cells = <&lvts_e_data1 &lvts_e_data2>;
+			nvmem-cell-names = "e_data1","e_data2";
+		};
+
 		pwm0: pwm@1100e000 {
 			compatible = "mediatek,mt8186-disp-pwm", "mediatek,mt8183-disp-pwm";
 			reg = <0 0x1100e000 0 0x1000>;
@@ -1668,6 +1680,14 @@ efuse: efuse@11cb0000 {
 			#address-cells = <1>;
 			#size-cells = <1>;
 
+			lvts_e_data1: data1 {
+				reg = <0x1cc 0x14>;
+			};
+
+			lvts_e_data2: data1-1 {
+				reg = <0x2f8 0x14>;
+			};
+
 			gpu_speedbin: gpu-speedbin@59c {
 				reg = <0x59c 0x4>;
 				bits = <0 3>;
diff --git a/drivers/thermal/mediatek/lvts_thermal.c b/drivers/thermal/mediatek/lvts_thermal.c
index ed1888fb24..e923d22c17 100644
--- a/drivers/thermal/mediatek/lvts_thermal.c
+++ b/drivers/thermal/mediatek/lvts_thermal.c
@@ -80,6 +80,8 @@
 #define LVTS_SENSOR_MAX				4
 #define LVTS_GOLDEN_TEMP_MAX		62
 #define LVTS_GOLDEN_TEMP_DEFAULT	50
+#define LVTS_COEFF_A_MT8186			-204650
+#define LVTS_COEFF_B_MT8186			204650
 #define LVTS_COEFF_A_MT8195			-250460
 #define LVTS_COEFF_B_MT8195			250460
 #define LVTS_COEFF_A_MT7988			-204650
@@ -92,6 +94,7 @@
 #define LVTS_MSR_READ_WAIT_US		(LVTS_MSR_READ_TIMEOUT_US / 2)
 
 #define LVTS_HW_SHUTDOWN_MT7988		105000
+#define LVTS_HW_SHUTDOWN_MT8186		105000
 #define LVTS_HW_SHUTDOWN_MT8192		105000
 #define LVTS_HW_SHUTDOWN_MT8195		105000
 
@@ -1377,6 +1380,62 @@ static int lvts_resume(struct device *dev)
 	return 0;
 }
 
+/*
+ * The MT8186 calibration data is stored as packed 3-byte little-endian
+ * values using a weird layout that makes sense only when viewed as a 32-bit
+ * hexadecimal word dump. Let's suppose SxBy where x = sensor number and
+ * y = byte number where the LSB is y=0. We then have:
+ *
+ *   [S0B2-S0B1-S0B0-S1B2] [S1B1-S1B0-S2B2-S2B1] [S2B0-S3B2-S3B1-S3B0]
+ *
+ * However, when considering a byte stream, those appear as follows:
+ *
+ *   [S1B2] [S0B0[ [S0B1] [S0B2] [S2B1] [S2B2] [S1B0] [S1B1] [S3B0] [S3B1] [S3B2] [S2B0]
+ *
+ * Hence the rather confusing offsets provided below.
+ */
+static const struct lvts_ctrl_data mt8186_lvts_data_ctrl[] = {
+	{
+		.lvts_sensor = {
+			{ .dt_id = MT8186_TS1_0,
+			  .cal_offsets = { 5, 6, 7 } },
+			{ .dt_id = MT8186_TS1_1,
+			  .cal_offsets = { 10, 11, 4 } },
+			{ .dt_id = MT8186_TS1_2,
+			  .cal_offsets = { 15, 8, 9 } },
+			{ .dt_id = MT8186_TS1_3,
+			  .cal_offsets = { 12, 13, 14 } }
+		},
+		.num_lvts_sensor = 4,
+		.offset = 0x0,
+		.hw_tshut_temp = LVTS_HW_SHUTDOWN_MT8186,
+	},
+	{
+		.lvts_sensor = {
+			{ .dt_id = MT8186_TS2_0,
+			  .cal_offsets = { 22, 23, 16 } },
+			{ .dt_id = MT8186_TS2_1,
+			  .cal_offsets = { 27, 20, 21 } }
+		},
+		.num_lvts_sensor = 2,
+		.offset = 0x100,
+		.hw_tshut_temp = LVTS_HW_SHUTDOWN_MT8186,
+	},
+	{
+		.lvts_sensor = {
+			{ .dt_id = MT8186_TS3_0,
+			  .cal_offsets = { 29, 30, 31 } },
+			{ .dt_id = MT8186_TS3_1,
+			  .cal_offsets = { 34, 35, 28 } },
+			{ .dt_id = MT8186_TS3_2,
+			  .cal_offsets = { 39, 32, 33 } }
+		},
+		.num_lvts_sensor = 3,
+		.offset = 0x200,
+		.hw_tshut_temp = LVTS_HW_SHUTDOWN_MT8186,
+	}
+};
+
 static const struct lvts_ctrl_data mt8192_lvts_mcu_data_ctrl[] = {
 	{
 		.lvts_sensor = {
@@ -1565,6 +1624,13 @@ static const struct lvts_data mt7988_lvts_ap_data = {
 	.temp_offset	= LVTS_COEFF_B_MT7988,
 };
 
+static const struct lvts_data mt8186_lvts_data = {
+	.lvts_ctrl	= mt8186_lvts_data_ctrl,
+	.num_lvts_ctrl	= ARRAY_SIZE(mt8186_lvts_data_ctrl),
+	.temp_factor	= LVTS_COEFF_A_MT8186,
+	.temp_offset	= LVTS_COEFF_B_MT8186,
+};
+
 static const struct lvts_data mt8192_lvts_mcu_data = {
 	.lvts_ctrl	= mt8192_lvts_mcu_data_ctrl,
 	.num_lvts_ctrl	= ARRAY_SIZE(mt8192_lvts_mcu_data_ctrl),
@@ -1591,6 +1657,7 @@ static const struct lvts_data mt8195_lvts_ap_data = {
 
 static const struct of_device_id lvts_of_match[] = {
 	{ .compatible = "mediatek,mt7988-lvts-ap", .data = &mt7988_lvts_ap_data },
+	{ .compatible = "mediatek,mt8186-lvts", .data = &mt8186_lvts_data },
 	{ .compatible = "mediatek,mt8192-lvts-mcu", .data = &mt8192_lvts_mcu_data },
 	{ .compatible = "mediatek,mt8192-lvts-ap", .data = &mt8192_lvts_ap_data },
 	{ .compatible = "mediatek,mt8195-lvts-mcu", .data = &mt8195_lvts_mcu_data },
diff --git a/include/dt-bindings/thermal/mediatek,lvts-thermal.h b/include/dt-bindings/thermal/mediatek,lvts-thermal.h
index 997e2f5512..3197ca6087 100644
--- a/include/dt-bindings/thermal/mediatek,lvts-thermal.h
+++ b/include/dt-bindings/thermal/mediatek,lvts-thermal.h
@@ -16,6 +16,16 @@
 #define MT7988_ETHWARP_0	6
 #define MT7988_ETHWARP_1	7
 
+#define MT8186_TS1_0		0
+#define MT8186_TS1_1		1
+#define MT8186_TS1_2		2
+#define MT8186_TS1_3		3
+#define MT8186_TS2_0		4
+#define MT8186_TS2_1		5
+#define MT8186_TS3_0		6
+#define MT8186_TS3_1		7
+#define MT8186_TS3_2		8
+
 #define MT8195_MCU_BIG_CPU0     0
 #define MT8195_MCU_BIG_CPU1     1
 #define MT8195_MCU_BIG_CPU2     2
-- 
2.42.0