From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Alexandru Ardelean <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 2/3] spi: Add SPI_NO_TX/RX support
Date: Fri, 27 Nov 2020 16:23:40 +0200 [thread overview]
Message-ID: <CAHp75VctXhpyBVB7Zw+SB5LiGcj6r850x+ehL7u2H0R4=y5rVw@mail.gmail.com> (raw)
In-Reply-To: <CAHp75Vcd4t=RqC31S-b1PXMtd=8sypSLhTrSgRD9hbpSqOphoQ@mail.gmail.com>
On Fri, Nov 27, 2020 at 4:22 PM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
> On Fri, Nov 27, 2020 at 3:08 PM Alexandru Ardelean
> <alexandru.ardelean@analog.com> wrote:
...
> > --- a/include/uapi/linux/spi/spi.h
> > +++ b/include/uapi/linux/spi/spi.h
> > @@ -43,5 +43,7 @@
> > #define SPI_TX_OCTAL 0x2000 /* transmit with 8 wires */
> > #define SPI_RX_OCTAL 0x4000 /* receive with 8 wires */
> > #define SPI_3WIRE_HIZ 0x8000 /* high impedance turnaround */
> > +#define SPI_NO_TX 0x10000 /* no transmit wire */
> > +#define SPI_NO_RX 0x20000 /* no receive wire */
>
> Is it really material for uAPI?
> Perhaps we may have something like
> SPI_MODE_USER_MASK in uAPI and
> in internal headers
>
> SPI_MODE_KERNEL_MASK with
> static_assert(_USER_MASK & _KERNEL_MASK); // check conditional
>
> ?
And logically start bits for the kernel from the end (31, 30, ...).
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2020-11-27 14:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-27 13:08 [PATCH v3 1/3] spi: uapi: unify SPI modes into a single spi.h header Alexandru Ardelean
2020-11-27 13:08 ` [PATCH v3 2/3] spi: Add SPI_NO_TX/RX support Alexandru Ardelean
2020-11-27 14:22 ` Andy Shevchenko
2020-11-27 14:23 ` Andy Shevchenko [this message]
2020-12-03 8:20 ` Ardelean, Alexandru
2020-12-03 9:47 ` Mark Brown
2020-11-27 13:08 ` [PATCH v3 3/3] spi: dt-bindings: document zero value for spi-{rx,tx}-bus-width properties Alexandru Ardelean
2020-11-27 14:26 ` Andy Shevchenko
2020-12-03 13:35 ` Ardelean, Alexandru
2020-11-27 14:12 ` [PATCH v3 1/3] spi: uapi: unify SPI modes into a single spi.h header Andy Shevchenko
2020-12-03 8:15 ` Ardelean, Alexandru
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