linux-kernel - Re: [PATCH 14/36] ARM: OMAP2+: gpmc: Allow drivers to reconfigure GPMC settings & timings

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Message-ID: <20140613072550.GM17845@atomide.com>
Date:	Fri, 13 Jun 2014 00:25:50 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Roger Quadros <rogerq@...com>
Cc:	dwmw2@...radead.org, computersforpeace@...il.com,
	kyungmin.park@...sung.com, pekon@...com,
	ezequiel.garcia@...e-electrons.com, javier@...hile0.org,
	nsekhar@...com, linux-omap@...r.kernel.org,
	linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/36] ARM: OMAP2+: gpmc: Allow drivers to reconfigure
 GPMC settings & timings

* Roger Quadros <rogerq@...com> [140611 01:58]:
> Some devices (e.g. TUSB6010, omap-onenand) need to reconfigure the GPMC
> timings in order to operate with different peripheral clock frequencies.
> Introduce omap_gpmc_retime() to allow them to do that. The driver
> needs to pass the chips select number, GPMC settings and Device timings to
> omap_gpmc_retime().
> 
> NOTE: Device tree and board code must still pass the most conservative
> timings to GPMC so that the device can be probed by the respective driver.
> e.g. Onenand must operate in asynchronous mode at bootup. The device driver
> can then request for more optimal timings via omap_gpmc_retime().

Hmm but many of the devices are Linux generic like sms91x and 8250 so it's
not nice to start stuffing omap bus specific data there.

I wonder if we should just keep device specific gpmc-smc91x.c etc
in drivers/memory?

Regards,

Tony
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