[PATCH 0/2] thermal: loongson2: Add support for Loongson-2K0300 SoC

[PATCH 0/2] thermal: loongson2: Add support for Loongson-2K0300 SoC

[Binbin Zhou]

Hi all:

This patch series adds thermal zone support for the Loongson-2K0300 SoC.

The Loongson-2K0300's thermal sensor is generally compatible with the
existing Loongson-2K series, but it features several key differences:
1. It has an independent CPU ID register for reading chip version
information.
2. The raw temperature output field has been extended from 8 bits to 11
bits.
3. The temperature calculation formula has been updated to incorporate a
correction factor based on the version information.

To ensure robustness on older hardware revisions, a fallback mechanism
is included: if the calculated temperature falls outside the valid range
(-55 TO 125),  the driver falls back to a simpler calculation and prints
a warning.

The patches have been validated on the Loongson-2K0300 development board.

Thanks.
Binbin

Binbin Zhou (2):
  dt-bindings: thermal: loongson,ls2k-thermal: Add compatible for
    Loongson-2K0300
  thermal/drivers/loongson2: Add thermal driver support for
    Loongson-2K0300

 .../thermal/loongson,ls2k-thermal.yaml        | 68 +++++++++++----
 drivers/thermal/loongson2_thermal.c           | 83 +++++++++++++++++--
 2 files changed, 127 insertions(+), 24 deletions(-)


base-commit: 795f1b1a91ae13ebc012a364075e42f486a1cafe
-- 
2.52.0

[PATCH 1/2] dt-bindings: thermal: loongson,ls2k-thermal: Add compatible for Loongson-2K0300

[Binbin Zhou]

Add a new compatible string `loongson,ls2k0300-thermal` for the thermal
sensor found on the Loongson-2K0300 SoC.

The hardware differs from the existing SoCs in its register layout: it
requires two register regions (one for the thermal sensor control and
another for the CPU ID).

Update the binding to describe this new requirement.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
---
 .../thermal/loongson,ls2k-thermal.yaml        | 68 ++++++++++++++-----
 1 file changed, 50 insertions(+), 18 deletions(-)

diff --git a/Documentation/devicetree/bindings/thermal/loongson,ls2k-thermal.yaml b/Documentation/devicetree/bindings/thermal/loongson,ls2k-thermal.yaml
index 79e691b08341..b5cbfd201105 100644
--- a/Documentation/devicetree/bindings/thermal/loongson,ls2k-thermal.yaml
+++ b/Documentation/devicetree/bindings/thermal/loongson,ls2k-thermal.yaml
@@ -10,13 +10,11 @@ maintainers:
   - zhanghongchen <zhanghongchen@loongson.cn>
   - Yinbo Zhu <zhuyinbo@loongson.cn>
 
-allOf:
-  - $ref: /schemas/thermal/thermal-sensor.yaml#
-
 properties:
   compatible:
     oneOf:
       - enum:
+          - loongson,ls2k0300-thermal
           - loongson,ls2k1000-thermal
           - loongson,ls2k2000-thermal
       - items:
@@ -39,23 +37,46 @@ required:
   - reg
   - interrupts
 
-if:
-  properties:
-    compatible:
-      contains:
-        enum:
-          - loongson,ls2k2000-thermal
+allOf:
+  - $ref: /schemas/thermal/thermal-sensor.yaml#
 
-then:
-  properties:
-    reg:
-      minItems: 2
-      maxItems: 2
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - loongson,ls2k0300-thermal
+    then:
+      properties:
+        reg:
+          items:
+            - description: Thermal base register region
+            - description: CPU ID register region
 
-else:
-  properties:
-    reg:
-      maxItems: 1
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - loongson,ls2k1000-thermal
+    then:
+      properties:
+        reg:
+          items:
+            - description: Thermal base register region
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - loongson,ls2k2000-thermal
+    then:
+      properties:
+        reg:
+          items:
+            - description: Thermal base register region
+            - description: Thermal data output register region
 
 unevaluatedProperties: false
 
@@ -69,3 +90,14 @@ examples:
         interrupts = <7 IRQ_TYPE_LEVEL_LOW>;
         #thermal-sensor-cells = <1>;
     };
+
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    thermal-sensor@16001500 {
+       compatible = "loongson,ls2k0300-thermal";
+       reg = <0x16001500 0x30>,
+             <0x16003ff0 0x8>;
+       interrupt-parent = <&liointc1>;
+       interrupts = <20 IRQ_TYPE_LEVEL_HIGH>;
+       #thermal-sensor-cells = <1>;
+    };
-- 
2.52.0

Re: [PATCH 1/2] dt-bindings: thermal: loongson,ls2k-thermal: Add compatible for Loongson-2K0300

[Conor Dooley]

[-- Attachment #1: Type: text/plain, Size: 3601 bytes --]

On Fri, Jul 10, 2026 at 04:24:59PM +0800, Binbin Zhou wrote:
> Add a new compatible string `loongson,ls2k0300-thermal` for the thermal
> sensor found on the Loongson-2K0300 SoC.
> 
> The hardware differs from the existing SoCs in its register layout: it
> requires two register regions (one for the thermal sensor control and
> another for the CPU ID).
> 
> Update the binding to describe this new requirement.
> 
> Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
> ---
>  .../thermal/loongson,ls2k-thermal.yaml        | 68 ++++++++++++++-----
>  1 file changed, 50 insertions(+), 18 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/thermal/loongson,ls2k-thermal.yaml b/Documentation/devicetree/bindings/thermal/loongson,ls2k-thermal.yaml
> index 79e691b08341..b5cbfd201105 100644
> --- a/Documentation/devicetree/bindings/thermal/loongson,ls2k-thermal.yaml
> +++ b/Documentation/devicetree/bindings/thermal/loongson,ls2k-thermal.yaml
> @@ -10,13 +10,11 @@ maintainers:
>    - zhanghongchen <zhanghongchen@loongson.cn>
>    - Yinbo Zhu <zhuyinbo@loongson.cn>
>  
> -allOf:
> -  - $ref: /schemas/thermal/thermal-sensor.yaml#
> -
>  properties:
>    compatible:
>      oneOf:
>        - enum:
> +          - loongson,ls2k0300-thermal
>            - loongson,ls2k1000-thermal
>            - loongson,ls2k2000-thermal
>        - items:
> @@ -39,23 +37,46 @@ required:
>    - reg
>    - interrupts
>  
> -if:
> -  properties:
> -    compatible:
> -      contains:
> -        enum:
> -          - loongson,ls2k2000-thermal
> +allOf:
> +  - $ref: /schemas/thermal/thermal-sensor.yaml#
>  
> -then:
> -  properties:
> -    reg:
> -      minItems: 2
> -      maxItems: 2
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - loongson,ls2k0300-thermal
> +    then:
> +      properties:
> +        reg:
> +          items:
> +            - description: Thermal base register region
> +            - description: CPU ID register region
>  
> -else:
> -  properties:
> -    reg:
> -      maxItems: 1
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - loongson,ls2k1000-thermal
> +    then:
> +      properties:
> +        reg:
> +          items:
> +            - description: Thermal base register region
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - loongson,ls2k2000-thermal
> +    then:
> +      properties:
> +        reg:
> +          items:
> +            - description: Thermal base register region
> +            - description: Thermal data output register region
>  
>  unevaluatedProperties: false
>  
> @@ -69,3 +90,14 @@ examples:
>          interrupts = <7 IRQ_TYPE_LEVEL_LOW>;
>          #thermal-sensor-cells = <1>;
>      };
> +
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    thermal-sensor@16001500 {
> +       compatible = "loongson,ls2k0300-thermal";
> +       reg = <0x16001500 0x30>,
> +             <0x16003ff0 0x8>;

Quite frankly, the address and size of this look like the second
register region here is actually a few bytes in a syscon that is being
misrepresented.
What lies at the addresses immediately before and after 0x16003ff0?


Thanks,
Conor.

> +       interrupt-parent = <&liointc1>;
> +       interrupts = <20 IRQ_TYPE_LEVEL_HIGH>;
> +       #thermal-sensor-cells = <1>;
> +    };
> -- 
> 2.52.0
> 

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Re: [PATCH 1/2] dt-bindings: thermal: loongson,ls2k-thermal: Add compatible for Loongson-2K0300

[Conor Dooley]

[-- Attachment #1: Type: text/plain, Size: 4068 bytes --]

On Fri, Jul 10, 2026 at 05:21:22PM +0100, Conor Dooley wrote:
> On Fri, Jul 10, 2026 at 04:24:59PM +0800, Binbin Zhou wrote:
> > Add a new compatible string `loongson,ls2k0300-thermal` for the thermal
> > sensor found on the Loongson-2K0300 SoC.
> > 
> > The hardware differs from the existing SoCs in its register layout: it
> > requires two register regions (one for the thermal sensor control and
> > another for the CPU ID).
> > 
> > Update the binding to describe this new requirement.
> > 
> > Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
> > ---
> >  .../thermal/loongson,ls2k-thermal.yaml        | 68 ++++++++++++++-----
> >  1 file changed, 50 insertions(+), 18 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/thermal/loongson,ls2k-thermal.yaml b/Documentation/devicetree/bindings/thermal/loongson,ls2k-thermal.yaml
> > index 79e691b08341..b5cbfd201105 100644
> > --- a/Documentation/devicetree/bindings/thermal/loongson,ls2k-thermal.yaml
> > +++ b/Documentation/devicetree/bindings/thermal/loongson,ls2k-thermal.yaml
> > @@ -10,13 +10,11 @@ maintainers:
> >    - zhanghongchen <zhanghongchen@loongson.cn>
> >    - Yinbo Zhu <zhuyinbo@loongson.cn>
> >  
> > -allOf:
> > -  - $ref: /schemas/thermal/thermal-sensor.yaml#
> > -
> >  properties:
> >    compatible:
> >      oneOf:
> >        - enum:
> > +          - loongson,ls2k0300-thermal
> >            - loongson,ls2k1000-thermal
> >            - loongson,ls2k2000-thermal
> >        - items:
> > @@ -39,23 +37,46 @@ required:
> >    - reg
> >    - interrupts
> >  
> > -if:
> > -  properties:
> > -    compatible:
> > -      contains:
> > -        enum:
> > -          - loongson,ls2k2000-thermal
> > +allOf:
> > +  - $ref: /schemas/thermal/thermal-sensor.yaml#
> >  
> > -then:
> > -  properties:
> > -    reg:
> > -      minItems: 2
> > -      maxItems: 2
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            enum:
> > +              - loongson,ls2k0300-thermal
> > +    then:
> > +      properties:
> > +        reg:
> > +          items:
> > +            - description: Thermal base register region
> > +            - description: CPU ID register region
> >  
> > -else:
> > -  properties:
> > -    reg:
> > -      maxItems: 1
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            enum:
> > +              - loongson,ls2k1000-thermal
> > +    then:
> > +      properties:
> > +        reg:
> > +          items:
> > +            - description: Thermal base register region
> > +
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            enum:
> > +              - loongson,ls2k2000-thermal
> > +    then:
> > +      properties:
> > +        reg:
> > +          items:
> > +            - description: Thermal base register region
> > +            - description: Thermal data output register region
> >  
> >  unevaluatedProperties: false
> >  
> > @@ -69,3 +90,14 @@ examples:
> >          interrupts = <7 IRQ_TYPE_LEVEL_LOW>;
> >          #thermal-sensor-cells = <1>;
> >      };
> > +
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/irq.h>
> > +    thermal-sensor@16001500 {
> > +       compatible = "loongson,ls2k0300-thermal";
> > +       reg = <0x16001500 0x30>,
> > +             <0x16003ff0 0x8>;
> 
> Quite frankly, the address and size of this look like the second
> register region here is actually a few bytes in a syscon that is being
> misrepresented.
> What lies at the addresses immediately before and after 0x16003ff0?

Hmm, I just realised that the new device is the 0300, making this second
reg property the "cpuid" region. That makes this doubly suspect looking.

> 
> 
> Thanks,
> Conor.
> 
> > +       interrupt-parent = <&liointc1>;
> > +       interrupts = <20 IRQ_TYPE_LEVEL_HIGH>;
> > +       #thermal-sensor-cells = <1>;
> > +    };
> > -- 
> > 2.52.0
> > 



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[PATCH 2/2] thermal/drivers/loongson2: Add thermal driver support for Loongson-2K0300

[Binbin Zhou]

The Loongson-2K0300 SoC uses a new thermal sensor that requires reading
a separate CPU ID register to obtain hardware version information. This
version info is used as a correction factor (fix_data) in the
temperature calculation formula.

Its thermal sensor requires the following hardware-specific handling:
 - Read chip ID register (offset 0x0 and 0x4) to get the compensation
   value (comp_val). The value is stored in either bits [31:20] of the
   ID0 register or bits [15:0] of the ID1 register, depending on the
   EXTERN_ID bit.

 - The compensation value is a signed 15-bit field; extract the value
   and apply sign accordingly.

Additionally, some early Loongson-2K0300 chips may have an old fuse that
yields invalid temperature readings outside the -55 to 125 range. In
such cases, the driver falls back to a simplified formula (raw * 569 -
394700) and logs a warning, ensuring the system can still function
without crashing.

Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
---
 drivers/thermal/loongson2_thermal.c | 83 ++++++++++++++++++++++++++---
 1 file changed, 77 insertions(+), 6 deletions(-)

diff --git a/drivers/thermal/loongson2_thermal.c b/drivers/thermal/loongson2_thermal.c
index ea4dd2fb1f47..a7eb87070aa9 100644
--- a/drivers/thermal/loongson2_thermal.c
+++ b/drivers/thermal/loongson2_thermal.c
@@ -2,9 +2,11 @@
 /*
  * Author: zhanghongchen <zhanghongchen@loongson.cn>
  *         Yinbo Zhu <zhuyinbo@loongson.cn>
- * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
+ *         Binbin Zhou <zhoubinbin@loongson.cn>
+ * Copyright (C) 2022-2026 Loongson Technology Corporation Limited
  */
 
+#include <linux/bitfield.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/minmax.h>
@@ -23,27 +25,44 @@
 #define LOONGSON2_THSENS_CTRL_LOW_REG	0x8
 #define LOONGSON2_THSENS_STATUS_REG	0x10
 #define LOONGSON2_THSENS_OUT_REG	0x14
+#define LOONGSON2_THSENS_CFG_REG	0x18
 
 #define LOONGSON2_THSENS_INT_LO		BIT(0)
 #define LOONGSON2_THSENS_INT_HIGH	BIT(1)
 #define LOONGSON2_THSENS_INT_EN		(LOONGSON2_THSENS_INT_LO | \
 					 LOONGSON2_THSENS_INT_HIGH)
 #define LOONGSON2_THSENS_OUT_MASK	0xFF
+#define LS2K0300_THSENS_OUT_MASK	GENMASK(10, 0)
+
+#define LS2K0300_CHIP_ID1		0x4
+#define LS2K0300_EXTERN_ID		BIT(4)
+#define LS2K0300_ID0_VAL_MASK		GENMASK(31, 20)
+#define LS2K0300_ID1_VAL_MASK		GENMASK(15, 0)
+
+#define LS2K0300_COMP_VAL_MASK		GENMASK(14, 0)
+#define LS2K0300_COMP_SIGN_BIT		BIT(15)
+
+#define LS2K0300_LOWEST_VALID_TEMP	(-55000)
+#define LS2K0300_HIGHEST_VALID_TEMP	(125000)
 
 /*
  * This flag is used to indicate the temperature reading
  * method of the Loongson-2K2000
  */
 #define LS2K2000_THSENS_OUT_FLAG	BIT(0)
+#define LS2K0300_CHIP_ID_FLAG		BIT(1)
 
 struct loongson2_thermal_chip_data {
 	unsigned int thermal_sensor_sel;
 	unsigned int flags;
+	const struct thermal_zone_device_ops *thermal_ops;
 };
 
 struct loongson2_thermal_data {
+	struct device *dev;
 	void __iomem *ctrl_reg;
 	void __iomem *temp_reg;
+	void __iomem *id_reg;
 	const struct loongson2_thermal_chip_data *chip_data;
 };
 
@@ -71,6 +90,38 @@ static int loongson2_thermal_set(struct loongson2_thermal_data *data,
 	return 0;
 }
 
+static int loongson2_2k0300_get_temp(struct thermal_zone_device *tz, int *temp)
+{
+	struct loongson2_thermal_data *tdata = thermal_zone_device_priv(tz);
+	int calib_data, calib_offset, temp_mc, raw_adc;
+	u32 chip_id0, chip_id1;
+
+	raw_adc = FIELD_GET(LS2K0300_THSENS_OUT_MASK,
+			    readl(tdata->ctrl_reg + LOONGSON2_THSENS_OUT_REG));
+	chip_id0 = readl(tdata->id_reg);
+	chip_id1 = readl(tdata->id_reg + LS2K0300_CHIP_ID1);
+
+	if (chip_id0 & LS2K0300_EXTERN_ID)
+		calib_data = FIELD_GET(LS2K0300_ID1_VAL_MASK, chip_id1);
+	else
+		calib_data = FIELD_GET(LS2K0300_ID0_VAL_MASK, chip_id0);
+
+	calib_offset = FIELD_GET(LS2K0300_COMP_VAL_MASK, calib_data);
+	if (calib_data & LS2K0300_COMP_SIGN_BIT)
+		calib_offset = -calib_offset;
+
+	temp_mc = (raw_adc + calib_offset) * 570 - 394700;
+
+	/* For old fuse which can not read right thermal data */
+	if (temp_mc < LS2K0300_LOWEST_VALID_TEMP || temp_mc > LS2K0300_HIGHEST_VALID_TEMP) {
+		dev_warn_once(tdata->dev, "It's an old fuse, thermal %d is not right\n", temp_mc);
+		temp_mc = raw_adc * 569 - 394700;
+	}
+	*temp = temp_mc;
+
+	return 0;
+}
+
 static int loongson2_2k1000_get_temp(struct thermal_zone_device *tz, int *temp)
 {
 	int val;
@@ -112,6 +163,11 @@ static int loongson2_thermal_set_trips(struct thermal_zone_device *tz, int low,
 	return loongson2_thermal_set(data, low/MILLI, high/MILLI, true);
 }
 
+static const struct thermal_zone_device_ops loongson2_2k0300_of_thermal_ops = {
+	.get_temp = loongson2_2k0300_get_temp,
+	.set_trips = loongson2_thermal_set_trips,
+};
+
 static const struct thermal_zone_device_ops loongson2_2k1000_of_thermal_ops = {
 	.get_temp = loongson2_2k1000_get_temp,
 	.set_trips = loongson2_thermal_set_trips,
@@ -124,7 +180,6 @@ static const struct thermal_zone_device_ops loongson2_2k2000_of_thermal_ops = {
 
 static int loongson2_thermal_probe(struct platform_device *pdev)
 {
-	const struct thermal_zone_device_ops *thermal_ops;
 	struct device *dev = &pdev->dev;
 	struct loongson2_thermal_data *data;
 	struct thermal_zone_device *tzd;
@@ -134,6 +189,7 @@ static int loongson2_thermal_probe(struct platform_device *pdev)
 	if (!data)
 		return -ENOMEM;
 
+	data->dev = dev;
 	data->chip_data = device_get_match_data(dev);
 
 	data->ctrl_reg = devm_platform_ioremap_resource(pdev, 0);
@@ -145,10 +201,13 @@ static int loongson2_thermal_probe(struct platform_device *pdev)
 		data->temp_reg = devm_platform_ioremap_resource(pdev, 1);
 		if (IS_ERR(data->temp_reg))
 			return PTR_ERR(data->temp_reg);
+	}
 
-		thermal_ops = &loongson2_2k2000_of_thermal_ops;
-	} else {
-		thermal_ops = &loongson2_2k1000_of_thermal_ops;
+	/* The chip id register is needed for Loongson-2K0300 */
+	if (data->chip_data->flags & LS2K0300_CHIP_ID_FLAG) {
+		data->id_reg = devm_platform_ioremap_resource(pdev, 1);
+		if (IS_ERR(data->id_reg))
+			return PTR_ERR(data->id_reg);
 	}
 
 	irq = platform_get_irq(pdev, 0);
@@ -160,7 +219,7 @@ static int loongson2_thermal_probe(struct platform_device *pdev)
 	loongson2_thermal_set(data, 0, 0, false);
 
 	for (i = 0; i <= LOONGSON2_MAX_SENSOR_SEL_NUM; i++) {
-		tzd = devm_thermal_of_zone_register(dev, i, data, thermal_ops);
+		tzd = devm_thermal_of_zone_register(dev, i, data, data->chip_data->thermal_ops);
 
 		if (!IS_ERR(tzd))
 			break;
@@ -181,17 +240,29 @@ static int loongson2_thermal_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k0300_data = {
+	.thermal_sensor_sel = 0,
+	.flags = LS2K0300_CHIP_ID_FLAG,
+	.thermal_ops = &loongson2_2k0300_of_thermal_ops,
+};
+
 static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k1000_data = {
 	.thermal_sensor_sel = 0,
 	.flags = 0,
+	.thermal_ops = &loongson2_2k1000_of_thermal_ops,
 };
 
 static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k2000_data = {
 	.thermal_sensor_sel = 0,
 	.flags = LS2K2000_THSENS_OUT_FLAG,
+	.thermal_ops = &loongson2_2k2000_of_thermal_ops,
 };
 
 static const struct of_device_id of_loongson2_thermal_match[] = {
+	{
+		.compatible = "loongson,ls2k0300-thermal",
+		.data = &loongson2_thermal_ls2k0300_data,
+	},
 	{
 		.compatible = "loongson,ls2k1000-thermal",
 		.data = &loongson2_thermal_ls2k1000_data,
-- 
2.52.0

Re: [PATCH 2/2] thermal/drivers/loongson2: Add thermal driver support for Loongson-2K0300

[Huacai Chen]

Hi, Binbin,

On Fri, Jul 10, 2026 at 4:25 PM Binbin Zhou <zhoubinbin@loongson.cn> wrote:
>
> The Loongson-2K0300 SoC uses a new thermal sensor that requires reading
> a separate CPU ID register to obtain hardware version information. This
> version info is used as a correction factor (fix_data) in the
> temperature calculation formula.
>
> Its thermal sensor requires the following hardware-specific handling:
>  - Read chip ID register (offset 0x0 and 0x4) to get the compensation
>    value (comp_val). The value is stored in either bits [31:20] of the
>    ID0 register or bits [15:0] of the ID1 register, depending on the
>    EXTERN_ID bit.
>
>  - The compensation value is a signed 15-bit field; extract the value
>    and apply sign accordingly.
>
> Additionally, some early Loongson-2K0300 chips may have an old fuse that
> yields invalid temperature readings outside the -55 to 125 range. In
> such cases, the driver falls back to a simplified formula (raw * 569 -
> 394700) and logs a warning, ensuring the system can still function
> without crashing.
>
> Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
> ---
>  drivers/thermal/loongson2_thermal.c | 83 ++++++++++++++++++++++++++---
>  1 file changed, 77 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/thermal/loongson2_thermal.c b/drivers/thermal/loongson2_thermal.c
> index ea4dd2fb1f47..a7eb87070aa9 100644
> --- a/drivers/thermal/loongson2_thermal.c
> +++ b/drivers/thermal/loongson2_thermal.c
> @@ -2,9 +2,11 @@
>  /*
>   * Author: zhanghongchen <zhanghongchen@loongson.cn>
>   *         Yinbo Zhu <zhuyinbo@loongson.cn>
> - * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
> + *         Binbin Zhou <zhoubinbin@loongson.cn>
> + * Copyright (C) 2022-2026 Loongson Technology Corporation Limited
>   */
>
> +#include <linux/bitfield.h>
>  #include <linux/interrupt.h>
>  #include <linux/io.h>
>  #include <linux/minmax.h>
> @@ -23,27 +25,44 @@
>  #define LOONGSON2_THSENS_CTRL_LOW_REG  0x8
>  #define LOONGSON2_THSENS_STATUS_REG    0x10
>  #define LOONGSON2_THSENS_OUT_REG       0x14
> +#define LOONGSON2_THSENS_CFG_REG       0x18
>
>  #define LOONGSON2_THSENS_INT_LO                BIT(0)
>  #define LOONGSON2_THSENS_INT_HIGH      BIT(1)
>  #define LOONGSON2_THSENS_INT_EN                (LOONGSON2_THSENS_INT_LO | \
>                                          LOONGSON2_THSENS_INT_HIGH)
>  #define LOONGSON2_THSENS_OUT_MASK      0xFF
> +#define LS2K0300_THSENS_OUT_MASK       GENMASK(10, 0)
The naming is a little strange, maybe use LOONGSON2_THSENS_OUT_8B_MASK
and LOONGSON2_THSENS_OUT_10B_MASK?

> +
> +#define LS2K0300_CHIP_ID1              0x4
Also define LS2K0300_CHIP_ID0 here?

> +#define LS2K0300_EXTERN_ID             BIT(4)
> +#define LS2K0300_ID0_VAL_MASK          GENMASK(31, 20)
> +#define LS2K0300_ID1_VAL_MASK          GENMASK(15, 0)
> +
> +#define LS2K0300_COMP_VAL_MASK         GENMASK(14, 0)
> +#define LS2K0300_COMP_SIGN_BIT         BIT(15)
> +
> +#define LS2K0300_LOWEST_VALID_TEMP     (-55000)
> +#define LS2K0300_HIGHEST_VALID_TEMP    (125000)
>
>  /*
>   * This flag is used to indicate the temperature reading
>   * method of the Loongson-2K2000
>   */
>  #define LS2K2000_THSENS_OUT_FLAG       BIT(0)
> +#define LS2K0300_CHIP_ID_FLAG          BIT(1)
>
>  struct loongson2_thermal_chip_data {
>         unsigned int thermal_sensor_sel;
>         unsigned int flags;
> +       const struct thermal_zone_device_ops *thermal_ops;
>  };
>
>  struct loongson2_thermal_data {
> +       struct device *dev;
>         void __iomem *ctrl_reg;
>         void __iomem *temp_reg;
> +       void __iomem *id_reg;
>         const struct loongson2_thermal_chip_data *chip_data;
>  };
>
> @@ -71,6 +90,38 @@ static int loongson2_thermal_set(struct loongson2_thermal_data *data,
>         return 0;
>  }
>
> +static int loongson2_2k0300_get_temp(struct thermal_zone_device *tz, int *temp)
> +{
> +       struct loongson2_thermal_data *tdata = thermal_zone_device_priv(tz);
> +       int calib_data, calib_offset, temp_mc, raw_adc;
> +       u32 chip_id0, chip_id1;
> +
> +       raw_adc = FIELD_GET(LS2K0300_THSENS_OUT_MASK,
> +                           readl(tdata->ctrl_reg + LOONGSON2_THSENS_OUT_REG));
> +       chip_id0 = readl(tdata->id_reg);
> +       chip_id1 = readl(tdata->id_reg + LS2K0300_CHIP_ID1);
> +
> +       if (chip_id0 & LS2K0300_EXTERN_ID)
> +               calib_data = FIELD_GET(LS2K0300_ID1_VAL_MASK, chip_id1);
> +       else
> +               calib_data = FIELD_GET(LS2K0300_ID0_VAL_MASK, chip_id0);
> +
> +       calib_offset = FIELD_GET(LS2K0300_COMP_VAL_MASK, calib_data);
> +       if (calib_data & LS2K0300_COMP_SIGN_BIT)
> +               calib_offset = -calib_offset;
> +
> +       temp_mc = (raw_adc + calib_offset) * 570 - 394700;
> +
> +       /* For old fuse which can not read right thermal data */
> +       if (temp_mc < LS2K0300_LOWEST_VALID_TEMP || temp_mc > LS2K0300_HIGHEST_VALID_TEMP) {
Is there a better way to detect the old fuse? Because I think temp_mc
between LS2K0300_LOWEST_VALID_TEMP and  LS2K0300_HIGHEST_VALID_TEMP is
also not valid for the old fuse.

Huacai

> +               dev_warn_once(tdata->dev, "It's an old fuse, thermal %d is not right\n", temp_mc);
> +               temp_mc = raw_adc * 569 - 394700;
> +       }
> +       *temp = temp_mc;
> +
> +       return 0;
> +}
> +
>  static int loongson2_2k1000_get_temp(struct thermal_zone_device *tz, int *temp)
>  {
>         int val;
> @@ -112,6 +163,11 @@ static int loongson2_thermal_set_trips(struct thermal_zone_device *tz, int low,
>         return loongson2_thermal_set(data, low/MILLI, high/MILLI, true);
>  }
>
> +static const struct thermal_zone_device_ops loongson2_2k0300_of_thermal_ops = {
> +       .get_temp = loongson2_2k0300_get_temp,
> +       .set_trips = loongson2_thermal_set_trips,
> +};
> +
>  static const struct thermal_zone_device_ops loongson2_2k1000_of_thermal_ops = {
>         .get_temp = loongson2_2k1000_get_temp,
>         .set_trips = loongson2_thermal_set_trips,
> @@ -124,7 +180,6 @@ static const struct thermal_zone_device_ops loongson2_2k2000_of_thermal_ops = {
>
>  static int loongson2_thermal_probe(struct platform_device *pdev)
>  {
> -       const struct thermal_zone_device_ops *thermal_ops;
>         struct device *dev = &pdev->dev;
>         struct loongson2_thermal_data *data;
>         struct thermal_zone_device *tzd;
> @@ -134,6 +189,7 @@ static int loongson2_thermal_probe(struct platform_device *pdev)
>         if (!data)
>                 return -ENOMEM;
>
> +       data->dev = dev;
>         data->chip_data = device_get_match_data(dev);
>
>         data->ctrl_reg = devm_platform_ioremap_resource(pdev, 0);
> @@ -145,10 +201,13 @@ static int loongson2_thermal_probe(struct platform_device *pdev)
>                 data->temp_reg = devm_platform_ioremap_resource(pdev, 1);
>                 if (IS_ERR(data->temp_reg))
>                         return PTR_ERR(data->temp_reg);
> +       }
>
> -               thermal_ops = &loongson2_2k2000_of_thermal_ops;
> -       } else {
> -               thermal_ops = &loongson2_2k1000_of_thermal_ops;
> +       /* The chip id register is needed for Loongson-2K0300 */
> +       if (data->chip_data->flags & LS2K0300_CHIP_ID_FLAG) {
> +               data->id_reg = devm_platform_ioremap_resource(pdev, 1);
> +               if (IS_ERR(data->id_reg))
> +                       return PTR_ERR(data->id_reg);
>         }
>
>         irq = platform_get_irq(pdev, 0);
> @@ -160,7 +219,7 @@ static int loongson2_thermal_probe(struct platform_device *pdev)
>         loongson2_thermal_set(data, 0, 0, false);
>
>         for (i = 0; i <= LOONGSON2_MAX_SENSOR_SEL_NUM; i++) {
> -               tzd = devm_thermal_of_zone_register(dev, i, data, thermal_ops);
> +               tzd = devm_thermal_of_zone_register(dev, i, data, data->chip_data->thermal_ops);
>
>                 if (!IS_ERR(tzd))
>                         break;
> @@ -181,17 +240,29 @@ static int loongson2_thermal_probe(struct platform_device *pdev)
>         return 0;
>  }
>
> +static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k0300_data = {
> +       .thermal_sensor_sel = 0,
> +       .flags = LS2K0300_CHIP_ID_FLAG,
> +       .thermal_ops = &loongson2_2k0300_of_thermal_ops,
> +};
> +
>  static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k1000_data = {
>         .thermal_sensor_sel = 0,
>         .flags = 0,
> +       .thermal_ops = &loongson2_2k1000_of_thermal_ops,
>  };
>
>  static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k2000_data = {
>         .thermal_sensor_sel = 0,
>         .flags = LS2K2000_THSENS_OUT_FLAG,
> +       .thermal_ops = &loongson2_2k2000_of_thermal_ops,
>  };
>
>  static const struct of_device_id of_loongson2_thermal_match[] = {
> +       {
> +               .compatible = "loongson,ls2k0300-thermal",
> +               .data = &loongson2_thermal_ls2k0300_data,
> +       },
>         {
>                 .compatible = "loongson,ls2k1000-thermal",
>                 .data = &loongson2_thermal_ls2k1000_data,
> --
> 2.52.0
>