On Sat, Feb 06, 2021 at 08:46:16AM -0800, Guenter Roeck wrote:
> On 2/6/21 1:51 AM, Matwey V. Kornilov wrote:
> > Currently, many boards use just 'lm75' as a compatible string.
> >
> > Signed-off-by: Matwey V. Kornilov <matwey@xxxxxxxxxx>
> > ---
> > Documentation/devicetree/bindings/hwmon/lm75.yaml | 1 +
> > drivers/hwmon/lm75.c | 4 ++++
> > 2 files changed, 5 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/hwmon/lm75.yaml b/Documentation/devicetree/bindings/hwmon/lm75.yaml
> > index 96eed5cc7841..aec8edd1e0c6 100644
> > --- a/Documentation/devicetree/bindings/hwmon/lm75.yaml
> > +++ b/Documentation/devicetree/bindings/hwmon/lm75.yaml
> > @@ -13,6 +13,7 @@ maintainers:
> > properties:
> > compatible:
> > enum:
> > + - lm75
>
> Please split the .yaml file changes into a single patch, separate
> from the code changes. Also please make sure that the subject indicates
> that this is a bindings change.
>
> For this change, we'll definitely need feedback from Rob. I am not sure
> if such a generic compatible string is permitted or if we need to change
> the dts files instead.
>
> On a higher level, while lm75 is an extreme case, I see a few other
> violators as well.
>
> drivers/macintosh/windfarm_ad7417_sensor.c: { .compatible = "ad7417", },
> drivers/macintosh/windfarm_max6690_sensor.c: { .compatible = "max6690", },
Old as dirt PowerMac stuff...
> arch/arm/boot/dts/socfpga_arria10_socdk.dtsi: compatible = "ltc2977";
> arch/arm/boot/dts/aspeed-bmc-arm-centriq2400-rep.dts: compatible = "tmp421";
Pretty much a dead platform...
> arch/arm/boot/dts/nuvoton-npcm750-evb.dts: compatible = "tmp100";
> arch/arm/boot/dts/nuvoton-npcm750-evb.dts: compatible = "tmp100";
>
> so it would be good to know how to handle those in general.
The dts files can be fixed without a compatibility issue (at least for
Linux), so we should update them and leave the documentation as-is. We
just can't add a new vendor compatible to the driver and then change the
dts files like these as old kernels wouldn't recognized the new
compatibles (though we should backport compatibles like PCI IDs).
>
> Note that there is also:
>
> Documentation/devicetree/bindings/display/repaper.txt: compatible = "lm75b";
>
> but maybe that doesn't matter as much since it is not actually
> used in dts files.
Right.
Rob
