linux-kernel - [PATCH v4 19/21] dt-bindings: hwmon: (mr75203) add coefficient properties for the thermal equation

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Message-ID: <20220906083356.21067-20-farbere@amazon.com>
Date:   Tue, 6 Sep 2022 08:33:54 +0000
From:   Eliav Farber <farbere@...zon.com>
To:     <jdelvare@...e.com>, <linux@...ck-us.net>, <robh+dt@...nel.org>,
        <p.zabel@...gutronix.de>, <rtanwar@...linear.com>,
        <linux-hwmon@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <farbere@...zon.com>, <hhhawa@...zon.com>, <jonnyc@...zon.com>,
        <andriy.shevchenko@...el.com>
Subject: [PATCH v4 19/21] dt-bindings: hwmon: (mr75203) add coefficient properties for the thermal equation

Add optional temperature coefficient properties:
 *) moortec,ts-coeff-g
 *) moortec,ts-coeff-h
 *) moortec,ts-coeff-cal5
 *) moortec,ts-coeff-j
If defined they shall be used instead of defaults.

The coefficients were added to device tree on top of the series property
(which can be used to select between series 5 and series 6), because
coefficients can vary between product and product, and code defaults might
not be accurate enough.

Signed-off-by: Eliav Farber <farbere@...zon.com>
---
V4 -> V3:
- Add 'multipleOf: 1000' instead of plain text.
- Add minimum/maximum for some of the new properties.

V3 -> V2:
- Add "moortec" prefix to property name.

 .../bindings/hwmon/moortec,mr75203.yaml       | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml b/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml
index 28656e9d9059..5e3d060290a9 100644
--- a/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml
+++ b/Documentation/devicetree/bindings/hwmon/moortec,mr75203.yaml
@@ -100,6 +100,41 @@ properties:
     default: 5
     $ref: /schemas/types.yaml#/definitions/uint32
 
+  moortec,ts-coeff-g:
+    description:
+      G coefficient for temperature equation.
+      Default for series 5 = 60000
+      Default for series 6 = 57400
+    multipleOf: 1000
+    minimum: 1000
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  moortec,ts-coeff-h:
+    description:
+      H coefficient for temperature equation.
+      Default for series 5 = 200000
+      Default for series 6 = 249400
+    multipleOf: 1000
+    minimum: 1000
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  moortec,ts-coeff-cal5:
+    description:
+      cal5 coefficient for temperature equation.
+      Default for series 5 = 4094
+      Default for series 6 = 4096
+    minimum: 1
+    $ref: /schemas/types.yaml#/definitions/uint32
+
+  moortec,ts-coeff-j:
+    description:
+      J coefficient for temperature equation.
+      Default for series 5 = -100
+      Default for series 6 = 0
+    multipleOf: 1000
+    maximum: 0
+    $ref: /schemas/types.yaml#/definitions/int32
+
 required:
   - compatible
   - reg
@@ -123,5 +158,7 @@ examples:
         resets = <&rcu0 0x40 7>;
         moortec,vm-active-channels = /bits/ 8 <0x10 0x05>;
         moortec,vm-pre-scaler-x2 = /bits/ 8 <5 6 20>;
+        moortec,ts-coeff-g = <61400>;
+        moortec,ts-coeff-h = <253700>;
         #thermal-sensor-cells = <1>;
     };
-- 
2.37.1