From: Mark Brown <broonie@kernel.org>
To: Serge Semin <fancer.lancer@gmail.com>
Cc: Serge Semin <Sergey.Semin@baikalelectronics.ru>,
nandhini.srikandan@intel.com, robh+dt@kernel.org,
linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org, mgross@linux.intel.com,
kris.pan@intel.com, kenchappa.demakkanavar@intel.com,
furong.zhou@intel.com, mallikarjunappa.sangannavar@intel.com,
mahesh.r.vaidya@intel.com, rashmi.a@intel.com
Subject: Re: [PATCH v3 3/5] spi: dw: Add support for master mode selection for DWC SSI controller
Date: Thu, 11 Nov 2021 15:14:26 +0000 [thread overview]
Message-ID: <YY0zUjjVobtg85o6@sirena.org.uk> (raw)
In-Reply-To: <20211111145246.dj4gogl4rlbem6qc@mobilestation>
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On Thu, Nov 11, 2021 at 05:52:46PM +0300, Serge Semin wrote:
> On Thu, Nov 11, 2021 at 02:16:05PM +0000, Mark Brown wrote:
> > On Thu, Nov 11, 2021 at 02:51:59PM +0800, nandhini.srikandan@intel.com wrote:
> > > Add support to select the controller mode as master mode by setting
> > > Bit 31 of CTRLR0 register. This feature is supported for controller
> > > versions above v1.02.
> > Clearly older versions of the controller can also run in this mode...
> Yes, but the driver doesn't support the slave mode at the moment.
> So always enabling the master mode seems natural. (see my next comment
> also concerning this matter)
The commit message makes it sound like master mode is only supported for
the newer versions.
> > This makes the configuration unconditional, it's not gated by controller
> > version checks or any kind of quirk any more meaning that if anything
> We have already discussed this feature in v2:
> https://patchwork.kernel.org/project/spi-devel-general/patch/20210824085856.12714-3-nandhini.srikandan@intel.com/
> Since that bit has been reserved before 1.02a but is no available for
> any DWC SSI controller and the driver doesn't support the SPI-slave mode
> at the moment I suggested to just always set that flag for the DWC SSI
> code. Please see my reply to Nandhini here:
Given that people seem to frequently customise these IPs when
integrating them I wouldn't trust people not to have added some other
control into that reserved bit doing some magic stuff that's useful in
their system.
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next prev parent reply other threads:[~2021-11-11 15:14 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-11 6:51 [PATCH v3 0/5] Add support for Intel Thunder Bay SPI controller nandhini.srikandan
2021-11-11 6:51 ` [PATCH v3 1/5] dt-bindings: spi: Add SSTE support for DWC SSI controller nandhini.srikandan
2021-11-11 13:53 ` Mark Brown
2021-11-11 14:31 ` Serge Semin
2021-11-11 15:01 ` Mark Brown
2021-11-11 15:06 ` Serge Semin
2021-11-17 12:05 ` Srikandan, Nandhini
2021-11-11 6:51 ` [PATCH v3 2/5] spi: dw: " nandhini.srikandan
2021-11-11 13:56 ` Mark Brown
2021-11-11 14:16 ` Serge Semin
2021-11-11 14:42 ` Serge Semin
2021-11-11 6:51 ` [PATCH v3 3/5] spi: dw: Add support for master mode selection " nandhini.srikandan
2021-11-11 14:16 ` Mark Brown
2021-11-11 14:52 ` Serge Semin
2021-11-11 15:14 ` Mark Brown [this message]
2021-11-11 16:06 ` Serge Semin
2021-11-11 16:25 ` Mark Brown
2021-11-16 19:15 ` Serge Semin
2021-11-17 11:59 ` Srikandan, Nandhini
2021-12-08 11:03 ` Srikandan, Nandhini
2021-12-09 8:40 ` Serge Semin
2021-11-11 6:52 ` [PATCH v3 4/5] dt-bindings: spi: Add bindings for Intel Thunder Bay SoC nandhini.srikandan
2021-11-19 16:55 ` Rob Herring
2021-11-11 6:52 ` [PATCH v3 5/5] spi: dw: Add support for Intel Thunder Bay SPI controller nandhini.srikandan
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