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From: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Martin Sperl <martin-d5rIkyn9cnPYtjvyW6yDsg@public.gmane.org>
Cc: Ranjit Waghmode
	<ranjit.waghmode-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>,
	dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org,
	computersforpeace-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	michal.simek-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org,
	soren.brinkmann-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org,
	zajec5-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	ben-/+tVBieCtBitmTQ+vhA3Yw@public.gmane.org,
	marex-ynQEQJNshbs@public.gmane.org,
	b32955-KZfg59tc24xl57MIdRCFDg@public.gmane.org,
	knut.wohlrab-V5te9oGctAVWk0Htik3J/w@public.gmane.org,
	juhosg-p3rKhJxN3npAfugRpC6u6w@public.gmane.org,
	beanhuo-AL4WhLSQfzjQT0dZR+AlfA@public.gmane.org,
	linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	harinik-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org,
	punnaia-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org
Subject: Re: [LINUX RFC v2 1/4] spi: add support of two chip selects & data stripe
Date: Fri, 4 Sep 2015 16:37:18 +0100	[thread overview]
Message-ID: <20150904153718.GO5313@sirena.org.uk> (raw)
In-Reply-To: <E4C1DE94-773C-498F-9CD5-639FBEEE3139-d5rIkyn9cnPYtjvyW6yDsg@public.gmane.org>

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On Fri, Sep 04, 2015 at 02:35:52PM +0200, Martin Sperl wrote:
> > On 03.09.2015, at 14:12, Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:

> > This isn't saying that the controller supports more than one chip, it's
> > saying that the controller supports asserting more than one chip select
> > at once which isn't the same thing.  I'm also not entirely sure that
> > this makes sense as a separate feature to the data striping one - I'm
> > struggling to think of a way to use this sensibly separately to that.

> Well - there is one use-case that I can think of:
> fbtft has the requirement for some devices to control a GPIO to
> differentiate between command and data getting transferred
> - sort of 9 bit.

That's another thing again, isn't it?  It's one device switching between
two different control interfaces at runtime rather than two devices
controlled in lockstep.

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  parent reply	other threads:[~2015-09-04 15:37 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-26  6:26 [LINUX RFC v2 0/4] spi: add dual parallel mode support in Zynq MPSoC GQSPI controller Ranjit Waghmode
     [not found] ` <1440570367-22569-1-git-send-email-ranjit.waghmode-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
2015-08-26  6:26   ` [LINUX RFC v2 1/4] spi: add support of two chip selects & data stripe Ranjit Waghmode
     [not found]     ` <1440570367-22569-2-git-send-email-ranjit.waghmode-gjFFaj9aHVfQT0dZR+AlfA@public.gmane.org>
2015-09-03 12:12       ` Mark Brown
     [not found]         ` <20150903121232.GW12027-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-09-04 12:02           ` Ranjit Abhimanyu Waghmode
2015-09-11 12:36             ` Mark Brown
     [not found]               ` <20150911123644.GU12027-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-09-11 16:24                 ` Harini Katakam
2015-09-04 12:35           ` Martin Sperl
     [not found]             ` <E4C1DE94-773C-498F-9CD5-639FBEEE3139-d5rIkyn9cnPYtjvyW6yDsg@public.gmane.org>
2015-09-04 15:37               ` Mark Brown [this message]
     [not found]                 ` <20150904153718.GO5313-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2015-09-04 15:48                   ` Martin Sperl
2015-08-26  6:26   ` [LINUX RFC v2 2/4] mtd: add spi_device instance to spi_nor struct Ranjit Waghmode
2015-08-26  6:26   ` [LINUX RFC v2 3/4] spi-nor: add dual parallel mode support Ranjit Waghmode
2015-08-26  6:26   ` [LINUX RFC v2 4/4] spi: zynqmp: gqspi: add support for dual parallel mode configuration Ranjit Waghmode
2015-08-26  6:56 ` [LINUX RFC v2 0/4] spi: add dual parallel mode support in Zynq MPSoC GQSPI controller Marek Vasut
     [not found]   ` <201508260856.22258.marex-ynQEQJNshbs@public.gmane.org>
2015-09-02 17:12     ` Ranjit Abhimanyu Waghmode
     [not found]       ` <7CFCFE83B8145347A1D424EC939F1C3C014AFF00-4lKfpRxZ5enZMOc0yg5rMog+Gb3gawCHQz34XiSyOiE@public.gmane.org>
2015-09-02 18:56         ` Marek Vasut
     [not found]           ` <201509022056.09635.marex-ynQEQJNshbs@public.gmane.org>
2015-09-03 13:25             ` Ranjit Abhimanyu Waghmode
     [not found]               ` <7CFCFE83B8145347A1D424EC939F1C3C014B08B2-4lKfpRxZ5enZMOc0yg5rMog+Gb3gawCHQz34XiSyOiE@public.gmane.org>
2015-09-03 13:38                 ` Marek Vasut
2015-08-26 12:19 ` Jagan Teki
     [not found]   ` <CAD6G_RQhWBsUTZNBB44W98Fjzw82H_D_E9nY0aDWezj729mkoA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-26 15:32     ` punnaiah choudary kalluri
     [not found]       ` <CAGnW=BZtsVtT+Z7gTq5jybXsHWp+RNpjc6ckk6-MXWxAS7u8Mw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-27  6:23         ` Jagan Teki
     [not found]           ` <CAD6G_RTCQ5Fzjgxz+-3oMDAyUTg6UFAqvpEPQzJ9maSTZ3Nc_g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-27  8:48             ` punnaiah choudary kalluri
     [not found]               ` <CAGnW=BZ80B_2kzZVULhZvEXFs+_GXkGbu8mii1eFp3MySvA8aA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-27 10:15                 ` Jagan Teki
     [not found]                   ` <CAD6G_RR+QnuK++KvztYo+68sb7yQqwM7qg-X7bybCYaBN+nAGQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-08-27 11:49                     ` punnaiah choudary kalluri
2015-08-28  4:13                       ` Jagan Teki

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