linux-kernel - [PATCH v2 1/7] dt-bindings: iio: BU27034 => BU27034ANUC

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Message-ID: <c39f9c67b3c07a27d7a13109c7b69cff9cfd2b9b.1720176341.git.mazziesaccount@gmail.com>
Date: Fri, 5 Jul 2024 13:54:12 +0300
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
	Matti Vaittinen <mazziesaccount@...il.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matti Vaittinen <mazziesaccount@...il.com>,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/7] dt-bindings: iio: BU27034 => BU27034ANUC

The BU27034NUC was cancelled before it entered mass production. It was
replaced by a new variant BU27034ANUC (note, added 'A'). The new
variant gained a few significant changes, like removal of the 3.rd data
channel and dropping some of the gain settings. This means that, from
software point of view these ICs are incompatible. Lux calculation based
on the data from the sensors needs to be done differently, and on the
BU27034ANUC the channel 3 data is missing. Also, the gain setting
differencies matter.

Unfortunately, the identification register was not changed so there is no
safe way for the software to distinguish the variants.

According to the ROHM HQ engineers, the old BU27034NUC should not be
encountered in the wild. Hence it makes sense to remove the support for
the old BU27034NUC and add support for the new BU27034ANUC. Change the
compatible in order to not load the incompatible old driver for new sensor
(or, if someone had the old sensor, the new driver for it).

Drop the compatible for old sensor which should not be in the wild and
add a new compatible for the new model with accurate model suffix
'anuc'.

Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>

---
A patch renaming the file according to the new compatible will follow.
If renaming is not needed or appropriate, that patch can be dropped.

Revision history:
v2: New patch
---
 .../devicetree/bindings/iio/light/rohm,bu27034.yaml      | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/iio/light/rohm,bu27034.yaml b/Documentation/devicetree/bindings/iio/light/rohm,bu27034.yaml
index 30a109a1bf3b..535bd18348ac 100644
--- a/Documentation/devicetree/bindings/iio/light/rohm,bu27034.yaml
+++ b/Documentation/devicetree/bindings/iio/light/rohm,bu27034.yaml
@@ -4,20 +4,19 @@
 $id: http://devicetree.org/schemas/iio/light/rohm,bu27034.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#

-title: ROHM BU27034 ambient light sensor
+title: ROHM BU27034ANUC ambient light sensor

 maintainers:
   - Matti Vaittinen <mazziesaccount@...il.com>

 description: |
-  ROHM BU27034 is an ambient light sesnor with 3 channels and 3 photo diodes
+  ROHM BU27034ANUC is an ambient light sesnor with 2 channels and 2 photo diodes
   capable of detecting a very wide range of illuminance. Typical application
   is adjusting LCD and backlight power of TVs and mobile phones.
-  https://fscdn.rohm.com/en/products/databook/datasheet/ic/sensor/light/bu27034nuc-e.pdf

 properties:
   compatible:
-    const: rohm,bu27034
+    const: rohm,bu27034anuc

   reg:
     maxItems: 1
@@ -37,7 +36,7 @@ examples:
       #size-cells = <0>;

       light-sensor@38 {
-        compatible = "rohm,bu27034";
+        compatible = "rohm,bu27034anuc";
         reg = <0x38>;
         vdd-supply = <&vdd>;
       };
-- 
2.45.1

-- 
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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