linux-kernel - [RFC PATCH v3 1/9] dt-bindings: battery: Add temperature-capacity degradation table

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Message-ID: <740503b6b6439e01959016223f1ae464e82824c3.1637061794.git.matti.vaittinen@fi.rohmeurope.com>
Date:   Tue, 16 Nov 2021 14:24:48 +0200
From:   Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To:     Matti Vaittinen <mazziesaccount@...il.com>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Lee Jones <lee.jones@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>, rostokus@...il.com,
        fan.chen@...iatek.com, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-power@...rohmeurope.com
Subject: [RFC PATCH v3 1/9] dt-bindings: battery: Add temperature-capacity
 degradation table

Some charger/battery vendors describe the temperature impact to
battery capacity by providing tables with capacity change at
given temperature. Support providing this temperature - capacity
dependency using the simple-battery DT nodes.

Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
---
 .../bindings/power/supply/battery.yaml        | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/supply/battery.yaml b/Documentation/devicetree/bindings/power/supply/battery.yaml
index d56ac484fec5..98cc85b92a71 100644
--- a/Documentation/devicetree/bindings/power/supply/battery.yaml
+++ b/Documentation/devicetree/bindings/power/supply/battery.yaml
@@ -114,6 +114,25 @@ properties:
       - description: alert when battery temperature is lower than this value
       - description: alert when battery temperature is higher than this value
 
+  temp-degrade-table:
+    $ref: /schemas/types.yaml#/definitions/uint32-matrix
+    description: |
+      An array of value triplets. First value is "capacity change per degree C"
+      when temperature differs from 'set point'. Second value is "capacity
+      degradation at given 'set point' temperature" and third value is "the
+      'set-point' temperature" where given degradation is correct.
+      Up to 100 value triplets can be provided to specify different degradation
+      for different temperature ranges. When capacity change caused by
+      temperatures is computed the range which 'set point' is closest to the
+      current temperature is used. Capacity change should be in units of
+      micro Ah. Temperature is in units of 0.1 C degree.
+    maxItems: 100
+    items:
+      items:
+        - description: capacity drop per degree C in micro Ah
+        - description: capacity drop at 'set point' temperature in micro Ah
+        - description: 'set point' temperature for this range in 0.1 degree C
+
 required:
   - compatible
 
-- 
2.31.1


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =] 

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