linux-kernel - Re: [PATCH 3/4] regmap: Add SPI bus support

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Date:	Fri, 15 Jul 2011 13:39:25 +0900
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Greg KH <greg@...ah.com>,
	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	Liam Girdwood <lrg@...com>,
	Samuel Oritz <sameo@...ux.intel.com>,
	Graeme Gregory <gg@...mlogic.co.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] regmap: Add SPI bus support

On Thu, Jul 14, 2011 at 08:53:27PM -0600, Grant Likely wrote:
> On Sat, Jul 09, 2011 at 01:50:43PM +0900, Mark Brown wrote:

> >  obj-$(CONFIG_I2C) += regmap-i2c.o
> > +obj-$(CONFIG_SPI) += regmap-spi.o

> I would think this code should live with drivers/spi.c  And similar
> for the i2c implementation.

There was a bit about this in the cover mail - it's the interace
stability issue again, the plan is to move them once we're more
confident that the interface used will stay stable.

> > +{
> > +	struct spi_device *spi = to_spi_device(dev);
> > +	struct spi_message m;
> > +	struct spi_transfer t[2];

> > +	spi_message_init(&m);
> > +
> > +	memset(&t, 0, sizeof(t));

> If you do:

> 	struct spi_transfer t[2] = { {.tx_buf = reg, .len = reg_len},
> 				     {.tx_buf = val, .len = val_len}};

> Then the memset() and t[0]/t[1] lines can all be culled.

That does the init to zero?

> > +	t[1].tx_buf = val;
> > +	t[1].len = val_len;
> > +	spi_message_add_tail(&t[0], &m);

> t[0]?

Yes, that's been fixed in git for a little while now.
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