linux-kernel - Re: [PATCH] i2c: imx: add retries for i2c-0 on Ventana boards

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Message-ID: <CAJ+vNU2QLTh7-tbLB_b2S04+pMg3VFjN2kk8T2d6x1okdmbx1A@mail.gmail.com>
Date:	Fri, 8 Jul 2016 12:49:04 -0700
From:	Tim Harvey <tharvey@...eworks.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	Wolfram Sang <wsa@...-dreams.de>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	linux-i2c@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] i2c: imx: add retries for i2c-0 on Ventana boards

On Thu, Jul 7, 2016 at 11:28 PM, Uwe Kleine-König
<u.kleine-koenig@...gutronix.de> wrote:
> Hello Tim,
>
> On Thu, Jul 07, 2016 at 07:03:49AM -0700, Tim Harvey wrote:
>> Gateworks Ventana IMX6 based boards have a Gateworks System Controller [1]
>> (gsc) device that can NAK i2c transactions when its busy in an ADC loop. As
>> this is always on i2c-0 we will add retries for that bus for any Ventana
>> board.
>
> The right thing is to fix the drivers IMHO.
>

Hi Uwe,

Thanks for the feedack!

The issue I have is that the i2c device emulates several other devices
with existing drivers (pca953x, ds1672, at24) and those drivers don't
have any retry mechanism in place for a retry.

Maybe if I converted those drivers to use regmap I could implement a
regmap with retries in the mfd driver for my device?

Regards,

Tim