From: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Geert Uytterhoeven
<geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
Cc: Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-renesas-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 4/4] spi: sh-msiof: Document hardware limitations related to chip selects
Date: Thu, 14 Dec 2017 11:45:44 +0000 [thread overview]
Message-ID: <20171214114544.GC9788@sirena.org.uk> (raw)
In-Reply-To: <1513191913-10612-5-git-send-email-geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
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On Wed, Dec 13, 2017 at 08:05:13PM +0100, Geert Uytterhoeven wrote:
> + Hardware limitations related to chip selects:
> + - Native chip selects are always deasserted in
> + between transfers that are part of the same
> + message. Use cs-gpios to work around this.
Ideally the driver would be generating an error when it sees
multi-transfer messages.
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next prev parent reply other threads:[~2017-12-14 11:45 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-13 19:05 [PATCH 0/4] spi: sh-msiof: Multi-slave enhancements Geert Uytterhoeven
2017-12-13 19:05 ` [PATCH 1/4] spi: sh-msiof: Avoid writing to registers from spi_master.setup() Geert Uytterhoeven
2017-12-14 11:50 ` Applied "spi: sh-msiof: Avoid writing to registers from spi_master.setup()" to the spi tree Mark Brown
[not found] ` <1513191913-10612-1-git-send-email-geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
2017-12-13 19:05 ` [PATCH 2/4] spi: sh-msiof: Extend support to 3 native chip selects Geert Uytterhoeven
2017-12-14 11:50 ` Applied "spi: sh-msiof: Extend support to 3 native chip selects" to the spi tree Mark Brown
2017-12-13 19:05 ` [PATCH 3/4] spi: sh-msiof: Implement cs-gpios configuration Geert Uytterhoeven
2017-12-14 11:49 ` Applied "spi: sh-msiof: Implement cs-gpios configuration" to the spi tree Mark Brown
2017-12-13 19:05 ` [PATCH 4/4] spi: sh-msiof: Document hardware limitations related to chip selects Geert Uytterhoeven
[not found] ` <1513191913-10612-5-git-send-email-geert+renesas-gXvu3+zWzMSzQB+pC5nmwQ@public.gmane.org>
2017-12-14 11:45 ` Mark Brown [this message]
2017-12-14 11:49 ` Applied "spi: sh-msiof: Document hardware limitations related to chip selects" to the spi tree Mark Brown
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