On Thu, Jul 22, 2021 at 11:34:53AM +0200, Maxime Ripard wrote:

Hi Jonathan,

On Thu, Jul 22, 2021 at 10:20:27AM +0100, Jonathan Cameron wrote:

quoted

On Wed, 21 Jul 2021 16:03:44 +0200
Maxime Ripard [off-list ref] wrote:

quoted

Even though we had the iio-hwmon driver for some time and a number of
boards using it already, we never had a binding for it. Let's add it
based on what the driver expects and the boards are providing.

Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jean Delvare <jdelvare@suse.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: linux-hwmon@vger.kernel.org
Signed-off-by: Maxime Ripard <redacted>
---
 .../devicetree/bindings/hwmon/iio-hwmon.yaml  | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/iio-hwmon.yaml

diff --git a/Documentation/devicetree/bindings/hwmon/iio-hwmon.yaml b/Documentation/devicetree/bindings/hwmon/iio-hwmon.yaml
new file mode 100644
index 000000000000..49dd40f663a6
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwmon/iio-hwmon.yaml

@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/hwmon/iio-hwmon.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: ADC-attached Hardware Sensor Device Tree Bindings
+
+maintainers:
+  - Jonathan Cameron <jic23@kernel.org>

I'd like to share the blame for this one.  Binding was originally added
by Guenter.

https://lore.kernel.org/linux-iio/1359668588-13678-4-git-send-email-linux@roeck-us.net/ (local)
https://lore.kernel.org/linux-iio/1359668588-13678-11-git-send-email-linux@roeck-us.net/ (local)
:)

As bindings go this one has always been controversial because
it's mapping between linux subsystems rather than really describing
hardware.  We've had various discussions over the years on how to do
this differently, but perhaps just documenting the current state is the
way to go.  That doesn't stop us moving to something better in the
future.

There's DT using it already, so I guess it's a bit too late to have that
discussion indeed :)

quoted

quoted

+
+description: >
+  Bindings for hardware monitoring devices connected to ADC controllers
+  supporting the Industrial I/O bindings.
+
+properties:
+  compatible:
+    const: iio-hwmon
+
+  io-channels:
+    minItems: 1
+    maxItems: 1024

Why 1024?

Ought to be enough for anyone :)

We have to set a maximum and I couldn't find any actual maximum
documented, if you prefer another value let me know

Just add a comment: '# Should be enough'