| Message ID | 20201127130834.136348-3-alexandru.ardelean@analog.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v3,1/3] spi: uapi: unify SPI modes into a single spi.h header | expand |
> -----Original Message----- > From: Andy Shevchenko <andy.shevchenko@gmail.com> > Sent: Friday, November 27, 2020 4:26 PM > To: Ardelean, Alexandru <alexandru.Ardelean@analog.com> > Cc: linux-spi <linux-spi@vger.kernel.org>; devicetree > <devicetree@vger.kernel.org>; Linux Kernel Mailing List <linux- > kernel@vger.kernel.org>; Rob Herring <robh+dt@kernel.org>; Mark Brown > <broonie@kernel.org>; Bogdan, Dragos <Dragos.Bogdan@analog.com> > Subject: Re: [PATCH v3 3/3] spi: dt-bindings: document zero value for spi-{rx,tx}- > bus-width properties > > On Fri, Nov 27, 2020 at 3:08 PM Alexandru Ardelean > <alexandru.ardelean@analog.com> wrote: > > > > Following a change to the SPI framework, providing a value of zero for > > 'spi-rx-bus-width' and 'spi-tx-bus-width' is now possible and will > > essentially mean than no RX or TX is allowed. > > than -> that > > I'm wondering if we have a possibility to strict this for controllers that always > duplex (I assume that schema works in a way that the generic bindings is most > relaxed in comparison to the device specific ones in case of the same binding in > question). No idea here. > > -- > With Best Regards, > Andy Shevchenko
diff --git a/Documentation/devicetree/bindings/spi/spi-controller.yaml b/Documentation/devicetree/bindings/spi/spi-controller.yaml index 1b56d5e40f1f..f1aaaf9b3709 100644 --- a/Documentation/devicetree/bindings/spi/spi-controller.yaml +++ b/Documentation/devicetree/bindings/spi/spi-controller.yaml @@ -125,8 +125,9 @@ patternProperties: spi-rx-bus-width: description: Bus width to the SPI bus used for read transfers. + If 0 is provided, then no RX will be possible on this devices. $ref: /schemas/types.yaml#/definitions/uint32 - enum: [1, 2, 4, 8] + enum: [0, 1, 2, 4, 8] default: 1 spi-rx-delay-us: @@ -136,8 +137,9 @@ patternProperties: spi-tx-bus-width: description: Bus width to the SPI bus used for write transfers. + If 0 is provided, then no RX will be possible on this devices. $ref: /schemas/types.yaml#/definitions/uint32 - enum: [1, 2, 4, 8] + enum: [0, 1, 2, 4, 8] default: 1 spi-tx-delay-us:
Following a change to the SPI framework, providing a value of zero for 'spi-rx-bus-width' and 'spi-tx-bus-width' is now possible and will essentially mean than no RX or TX is allowed. Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> --- Documentation/devicetree/bindings/spi/spi-controller.yaml | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)