linux-kernel - Re: mc13xxx-core: kernel hangs after 'regmap

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Date:	Thu, 24 May 2012 15:33:16 +0800
From:	Shawn Guo <shawn.guo@...escale.com>
To:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
CC:	Fabio Estevam <festevam@...il.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	<marc@...esign.com.au>, Samuel Ortiz <sameo@...ux.intel.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	Philippe Rétornaz <philippe.retornaz@...l.ch>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: mc13xxx-core: kernel hangs after 'regmap_read'

On Thu, May 24, 2012 at 08:46:35AM +0200, Uwe Kleine-König wrote:
> Hello,
> 
> On Thu, May 24, 2012 at 02:39:00PM +0800, Shawn Guo wrote:
> > On Thu, May 24, 2012 at 01:07:43AM -0300, Fabio Estevam wrote:
> > > I am trying to understand why mx31pdk still fails.
> > > 
> > So different from imx51-babbage which uses MC13892, mx31pdk uses
> > MC13783?  But both chips should have the same regmap, right?
> They are similar. One difference is the protocol used. MC13783 only
> speaks spi, MC13892 can do both, spi and i2c. Does someone has a working
> MC13892 that uses spi?
> 
I do.  With the following patch applied on top of linux-next, it works
on my imx51-babbage board.

Regards,
Shawn

diff --git a/drivers/mfd/mc13xxx-spi.c b/drivers/mfd/mc13xxx-spi.c
index 3fcdab3..5d1969f 100644
--- a/drivers/mfd/mc13xxx-spi.c
+++ b/drivers/mfd/mc13xxx-spi.c
@@ -49,6 +49,7 @@ static struct regmap_config mc13xxx_regmap_spi_config = {
        .reg_bits = 7,
        .pad_bits = 1,
        .val_bits = 24,
+       .write_flag_mask = 0x80,

        .max_register = MC13XXX_NUMREGS,

@@ -73,7 +74,6 @@ static int mc13xxx_spi_probe(struct spi_device *spi)

        dev_set_drvdata(&spi->dev, mc13xxx);
        spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
-       spi->bits_per_word = 32;

        mc13xxx->dev = &spi->dev;
        mutex_init(&mc13xxx->lock);


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