linux-kernel - [PATCH] dt-bindings: mfd: bd71828: Use charger resistor in mOhm instead of MOhm

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Message-Id: <20241029111112.33386-1-andreas@kemnade.info>
Date: Tue, 29 Oct 2024 12:11:12 +0100
From: Andreas Kemnade <andreas@...nade.info>
To: lee@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	mazziesaccount@...il.com,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Andreas Kemnade <andreas@...nade.info>,
	sre@...nel.org
Subject: [PATCH] dt-bindings: mfd: bd71828: Use charger resistor in mOhm instead of MOhm

Apparently there was some confusion regarding milliohm vs. megaohm.
(m/M). Use microohms to be able to properly specify the charger
resistor like other drivers do. This is not used yet by mainline code
yet. Specify a current sense resistor in milliohms range rathes then
megaohms range in the examples.

CC: sre@...nel.org
Reported-by: Matti Vaittinen <mazziesaccount@...il.com>
Closes: https://lore.kernel.org/imx/6dcd724a-a55c-4cba-a45b-21e76b1973b0@gmail.com/T/#mf590875a9f4d3955cd1041d7196ff0c65c0a7e9d
Signed-off-by: Andreas Kemnade <andreas@...nade.info>
---
 .../devicetree/bindings/mfd/rohm,bd71828-pmic.yaml  | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/mfd/rohm,bd71828-pmic.yaml b/Documentation/devicetree/bindings/mfd/rohm,bd71828-pmic.yaml
index fa17686a64f7..09e7d68e92bf 100644
--- a/Documentation/devicetree/bindings/mfd/rohm,bd71828-pmic.yaml
+++ b/Documentation/devicetree/bindings/mfd/rohm,bd71828-pmic.yaml
@@ -55,14 +55,15 @@ properties:
     minimum: 0
     maximum: 1
 
-  rohm,charger-sense-resistor-ohms:
-    minimum: 10000000
-    maximum: 50000000
+  rohm,charger-sense-resistor-micro-ohms:
+    minimum: 10000
+    maximum: 50000
+    default: 30000
     description: |
       BD71827 and BD71828 have SAR ADC for measuring charging currents.
       External sense resistor (RSENSE in data sheet) should be used. If some
-      other but 30MOhm resistor is used the resistance value should be given
-      here in Ohms.
+      other but 30mOhm resistor is used the resistance value should be given
+      here in microohms.
 
   regulators:
     $ref: /schemas/regulator/rohm,bd71828-regulator.yaml
@@ -114,7 +115,7 @@ examples:
             #gpio-cells = <2>;
             gpio-reserved-ranges = <0 1>, <2 1>;
 
-            rohm,charger-sense-resistor-ohms = <10000000>;
+            rohm,charger-sense-resistor-micro-ohms = <10000>;
 
             regulators {
                 buck1: BUCK1 {
-- 
2.39.5