On Wed, May 20, 2020 at 08:41:59PM +0200, Heiko Stübner wrote: > Hi Dmitry, > > Am Mittwoch, 20. Mai 2020, 19:13:24 CEST schrieb Dmitry Torokhov: > > Hi Johan, > > > > On Wed, May 20, 2020 at 09:33:27AM +0200, Johan Jonker wrote: > > > A test with the command below gives this error: > > > > > > arch/arm/boot/dts/rk3188-bqedison2qc.dt.yaml: > > > touchscreen@3e: reg:0:0: 56 was expected > > > > > > The touchscreen chip on 'rk3188-bqedison2qc' and other BQ models > > > was shipped with different addresses then the binding currently allows. > > > Change the reg property that any address will pass. > > > > > > make ARCH=arm dtbs_check > > > DT_SCHEMA_FILES=Documentation/devicetree/bindings/input/touchscreen/ > > > edt-ft5x06.yaml > > > > > > Signed-off-by: Johan Jonker <jbx6244@xxxxxxxxx> > > > --- > > > Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml | 2 +- > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > > > diff --git a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml > > > index 383d64a91..baa8e8f7e 100644 > > > --- a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml > > > +++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.yaml > > > @@ -42,7 +42,7 @@ properties: > > > - focaltech,ft6236 > > > > > > reg: > > > - const: 0x38 > > > + maxItems: 1 > > > > Should we have a list of valid addresses instead of allowing any > > address? Controllers usually have only a couple of addresses that they > > support. > > from what I've read, the fdt touchscreen controllers are just a generic > cpu with device-specific (or better panel-specific) firmware, which seems > to include the address as well - so it looks to be variable. > > But of course that is only 2nd hand knowledge for me ;-) > > > But also, the i2c address is something you cannot really mess up, > either it is correct and your touchscreen works, or it isn't and and > adding entries to this list every time a new address variant pops up > feels clumsy. Is that an Ack? I'm fine either way. It's really only useful if there's a single address because with a list it could still be wrong just as any other data like an interrupt number could be wrong. Rob
