On 9/12/25 17:22, Frank Li wrote:
On Fri, Sep 12, 2025 at 08:17:09AM +0200, Maud Spierings wrote:
Hi Frank,
Thanks for the review.
On 9/11/25 17:33, Frank Li wrote:
On Thu, Sep 11, 2025 at 09:53:18AM +0200, Maud Spierings via B4 Relay wrote:
From: Maud Spierings <[email protected]>
The Maxim MAX25014 is a 4-channel automotive grade backlight driver IC
with integrated boost controller.
Signed-off-by: Maud Spierings <[email protected]>
---
.../bindings/leds/backlight/maxim,max25014.yaml | 81
++++++++++++++++++++++
MAINTAINERS | 5 ++
2 files changed, 86 insertions(+)
diff --git
a/Documentation/devicetree/bindings/leds/backlight/maxim,max25014.yaml
b/Documentation/devicetree/bindings/leds/backlight/maxim,max25014.yaml
new file mode 100644
index
0000000000000000000000000000000000000000..e113a2ad16aa74f982b9c2ea80578aed2d9424fe
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/backlight/maxim,max25014.yaml
@@ -0,0 +1,81 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/backlight/maxim,max25014.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim max25014 backlight controller
+
+maintainers:
+ - Maud Spierings <[email protected]>
+
+allOf:
+ - $ref: common.yaml#
+
+properties:
+ compatible:
+ enum:
+ - maxim,max25014
+
+ reg:
+ maxItems: 1
+
+ enable-gpios:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ power-supply:
+ description: Regulator which controls the boost converter input rail.
+
+ pwms:
+ maxItems: 1
+
+ maxim,iset:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ maximum: 15
+ default: 11
+ description:
+ Value of the ISET register field. This controls the current scale of the
+ outputs, a higher number means more current.
Use standard unit. Do not use register value directly.
It is unfortunately not just a value in Amps, it depends on the hardware
design. There is a kind of "default" table with a 49.9K resistor, but
depending on that resistor the current is different.
You should calculate in your driver. if 49.9K is dependence, you should
add xxx_ohm at dts.
I've tried to find the logic behind the Riref resistor and its
values/effects, but there is no formula for it, there are example values
for 49.9k and 40.2k, besides that all that is stated that the minimum
allowed value is 27.5k and the maximum value is 83.5k.
Not sure how to continue after that, I cannot verify/approximate any
relation with only two data points.
Kind regards,
Maud
