Quoting Maxime Ripard (2020-06-26 04:54:33)

The RaspberryPi firmware binding uses two compatible, include simple-bus.
The select statement generated by default will thus select any node that
has simple-bus, not all of them being the raspberrypi firmware node.

This results in warnings being wrongfully reported. Let's add a custom
select statement to fix that.

Fixes: 5bc0b9be8544 ("dt-bindings: arm: bcm: Convert BCM2835 firmware binding to YAML")
Signed-off-by: Maxime Ripard <redacted>

---

The original binding has been merged through the clock tree, so it should
be merged there.

Even though the original binding (and the DT) are using the simple-bus
compatible, this creates some DTC warnings since the firmware really isn't
a bus, so the node name doesn't match what a bus should have, none of the
children have a reg property, #address-cells and #size-cells are missing,
etc.

I can only guess that simple-bus was used to make the sub-devices probe,
but maybe simple-mfd would be more appropriate here?
---
 .../bindings/arm/bcm/raspberrypi,bcm2835-firmware.yaml   | 9 +++++++++
 1 file changed, 9 insertions(+)

Hmm. I'm still seeing warnings.

Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.example.dts:23.37-26.15: Warning (simple_bus_reg): /example-0/firmware/clocks: missing or emp
ty reg/ranges property
Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.example.dt.yaml: firmware: $nodename:0: 'firmware' does not match '^(bus|soc|axi|ahb|apb)(@[0-9a-f]+)?$'
Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.example.dt.yaml: firmware: '#address-cells' is a required property
Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.example.dt.yaml: firmware: '#size-cells' is a required property
Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-firmware.example.dt.yaml: firmware: 'ranges' is a required property