linux-kernel - RE: [PATCHv2 2/2] watchdog: imx2

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Message-ID: <1c79a81bbd7b4cc79689cb907e81e893@BY2PR03MB505.namprd03.prod.outlook.com>
Date:	Tue, 1 Apr 2014 02:24:12 +0000
From:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
To:	Guenter Roeck <linux@...ck-us.net>,
	"wim@...ana.be" <wim@...ana.be>,
	"w.sang@...gutronix.de" <w.sang@...gutronix.de>,
	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"broonie@...aro.org" <broonie@...aro.org>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"swarren@...dia.com" <swarren@...dia.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCHv2 2/2] watchdog: imx2_wdt: Add big-endian support

> > It's actually the following ones first, which will support 16-bits
> > Values for regmap-mmio:
> >
> > https://patchwork.kernel.org/patch/3896321/
> > https://patchwork.kernel.org/patch/3896331/
> > https://patchwork.kernel.org/patch/3901021/
> >
> > And the then the following one, which will support the LE endian:
> > http://www.spinics.net/lists/kernel/msg1714375.html
> >
> So what is the plan for this patch ? Seems to me it would make more sense
> to convert the driver to regmap.
> 

@Guenter, @Mark,

Yes, I do think so too and there has already regmap-mmio version patch
Series about the IMX2 Watchdog driver, but those regmap patches for
supporting the 16-bit values are in Mark's tree and the IMX2 Watchdog
will depend on them.

How to deal with this situation ?

The regmap patches depended by IMX2 Watchdog:

1, https://patchwork.kernel.org/patch/3896321/   ===> <applied>
   regmap: mmio: add regmap_mmio_{regsize, count}_check. 
   https://patchwork.kernel.org/patch/3896331/   ===> <applied>
   regmap: mmio: Add support for 1/2/8 bytes wide register address.
   https://patchwork.kernel.org/patch/3901021/   ===> <applied>
   regmap: mmio: Add regmap_mmio_regbits_check.

2, The above three and this one are a must.
   https://patchwork.kernel.org/patch/3912671/   ===> <pending>
   regmap: mmio: Fix the bug of 'offset' value parsing.

3, The following ones are not a must, but will make the IMX2
   Watchdog much simplifier.
   https://patchwork.kernel.org/patch/3912401/   ===> <pending>
   regmap: implement LE formatting/parsing for 16/32-bit values.
   https://patchwork.kernel.org/patch/3912751/   ===> <pending>
   regmap: add DT endianness binding support.
   https://patchwork.kernel.org/patch/3912741/   ===> <pending>
   regmap: Add the DT binding documentation for endianness

The above all have been test using SAI(32-bit regmap-mmio), 
SGTL5000(codec 16-bit regmap-i2c) and IMX2 Watchdog(16-bit
regmap-mmio).

I'll send the regmap-mmio based patch series for IMX2 Watchdog.

Thanks,

Best Regards,
Xiubo
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