Hi Vladimir, On Tue, Mar 27, 2018 at 11:30:29AM +0300, Vladimir Zapolskiy wrote: > Hi Sergei, > > On 03/27/2018 11:27 AM, Sergei Shtylyov wrote: > > Hello! > > > > On 3/27/2018 10:33 AM, jacopo mondi wrote: > > [...] > >>>>>>> Document Thine THC63LVD1024 LVDS decoder device tree bindings. > >>>>>>> > >>>>>>> Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx> > >>>>>>> Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx> > >>>>>>> Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx> > >>>>>>> --- > >>>>>>> .../bindings/display/bridge/thine,thc63lvd1024.txt | 66 +++++++++++++++++++ > >>>>>>> 1 file changed, 66 insertions(+) > >>>>>>> create mode 100644 > >>>>>>> Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt > >>>>>>> > >>>>>>> diff --git > >>>>>>> a/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt > >>>>>>> b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt > >>>>>>> new file mode 100644 > >>>>>>> index 0000000..8225c6a > >>>>>>> --- /dev/null > >>>>>>> +++ > >>>>>>> b/Documentation/devicetree/bindings/display/bridge/thine,thc63lvd1024.txt > >>>>>>> @@ -0,0 +1,66 @@ > >>>>>>> +Thine Electronics THC63LVD1024 LVDS decoder > >>>>>>> +------------------------------------------- > >>>>>>> + > >>>>>>> +The THC63LVD1024 is a dual link LVDS receiver designed to convert LVDS > >>>>>>> streams > >>>>>>> +to parallel data outputs. The chip supports single/dual input/output modes, > >>>>>>> +handling up to two two input LVDS stream and up to two digital CMOS/TTL > >>>>>>> outputs. > >>>>>>> + > >>>>>>> +Single or dual operation modes, output data mapping and DDR output modes > >>>>>>> are > >>>>>>> +configured through input signals and the chip does not expose any control > >>>>>>> bus. > >>>>>>> + > >>>>>>> +Required properties: > >>>>>>> +- compatible: Shall be "thine,thc63lvd1024" > >>>>>>> + > >>>>>>> +Optional properties: > >>>>>>> +- vcc-supply: Power supply for TTL output and digital circuitry > >>>>>>> +- cvcc-supply: Power supply for TTL CLOCKOUT signal > >>>>>>> +- lvcc-supply: Power supply for LVDS inputs > >>>>>>> +- pvcc-supply: Power supply for PLL circuitry > >>>>>> As explained in a comment to one of the previous versions of this series, I'm > >>>>>> tempted to make vcc-supply mandatory and drop the three other power supplies > >>>>>> for now, as I believe there's very little chance they will be connected to > >>>>>> separately controllable regulators (all supplies use the same voltage). In the > >>>>>> very unlikely event that this occurs in design we need to support in the > >>>>>> future, the cvcc, lvcc and pvcc supplies can be added later as optional > >>>>>> without breaking backward compatibility. > >>>>> I'm okay with that. > >>>>> > >>>>>> Apart from that, > >>>>>> > >>>>>> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> > >>>>>> > >>>>>>> +- pdwn-gpios: Power down GPIO signal. Active low > >>>>> powerdown-gpios is the semi-standard name. > >>>>> > >>>> right, I've also noticed it. If possible please avoid shortenings in > >>>> property names. > >>> > >>> It is not shortening, it just follow pin name from decoder's datasheet. > >>> > >>>> > >>>>>>> +- oe-gpios: Output enable GPIO signal. Active high > >>>>>>> + > >>>> And this one is also a not ever met property name, please consider to > >>>> rename it to 'enable-gpios', for instance display panels define it. > >>> > >>> > >>> Again, it follows datasheet naming scheme. Has something changed in DT > >>> conventions? > >> > >> Seconded. My understanding is that the property name should reflect > >> what reported in the the chip manual. For THC63LVD1024 the enable and > >> power down pins are named 'OE' and 'PDWN' respectively. > > > > But don't we need the vendor prefix in the prop names then, like > > "renesas,oe-gpios" then? > > > > Seconded, with a correction to "thine,oe-gpios". > mmm, okay then... A grep for that semi-standard properties names in Documentation/ returns only usage examples and no actual definitions, so I assume this is why they are semi-standard. Seems like there is some tribal knowledge involved in defining what is semi-standard and what's not, or are those properties documented somewhere? Thanks j > If vendor agnostic properties are supposed to be used, then please follow > the referenced by Rob semi-standard notations. > > -- > With best wishes, > Vladimir
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