[i2c] [PATCH 1/1] I2C pxa fast mode (400khz) support

[Ben Dooks]

On Thu, Jul 03, 2008 at 10:00:36AM +0800, Eric Miao wrote:
> Jonathan Cameron wrote:
> > Add fast_mode option to i2c_pxa_platform_data and use it to set the ICR_FM bit
> > appropriately when i2c_pxa_reset is called. Parameter called fast_mode rather
> > than frequency as this driver is also used for the i2c_pxa_pwr bus which has
> > different normal and fast frequencies.
> 
> Maybe we should convert that (as well as 'use_pio') to a bit field to save
> another byte.

I think use_pio and fast_mode could both be bits.
 
> Otherwise looks OK to me.
> 
> > 
> > Signed-off-by: Jonathan Cameron <jic23 at cam.ac.uk>
> > ---
> >  drivers/i2c/busses/i2c-pxa.c        |    4 +++-
> >  include/asm-arm/arch-pxa/i2c.h      |    1 +
> >  include/asm-arm/arch-pxa/pxa-regs.h |    1 +
> >  3 files changed, 5 insertions(+), 1 deletion(-)
> > 
> > --- a/include/asm-arm/arch-pxa/pxa-regs.h	2008-06-30 20:06:02.000000000 +0100
> > +++ b/include/asm-arm/arch-pxa/pxa-regs.h	2008-07-02 14:03:19.000000000 +0100
> > @@ -448,6 +448,7 @@
> >  #define ICR_ALDIE	(1 << 12)	   /* enable arbitration interrupt */
> >  #define ICR_SADIE	(1 << 13)	   /* slave address detected int enable */
> >  #define ICR_UR		(1 << 14)	   /* unit reset */
> > +#define ICR_FM		(1 << 15)	   /* fast mode */
> >  
> >  #define ISR_RWM		(1 << 0)	   /* read/write mode */
> >  #define ISR_ACKNAK	(1 << 1)	   /* ack/nak status */
> > --- a/include/asm-arm/arch-pxa/i2c.h	2008-06-30 20:04:02.000000000 +0100
> > +++ b/include/asm-arm/arch-pxa/i2c.h	2008-07-02 13:59:59.000000000 +0100
> > @@ -66,6 +66,7 @@ struct i2c_pxa_platform_data {
> >  	struct i2c_slave_client	*slave;
> >  	unsigned int		class;
> >  	int			use_pio;
> > +	int			fast_mode;
> >  };
> >  
> >  extern void pxa_set_i2c_info(struct i2c_pxa_platform_data *info);
> > --- a/drivers/i2c/busses/i2c-pxa.c	2008-06-30 20:05:51.000000000 +0100
> > +++ b/drivers/i2c/busses/i2c-pxa.c	2008-07-02 15:50:31.000000000 +0100
> > @@ -67,6 +67,7 @@ struct pxa_i2c {
> >  
> >  	int			irq;
> >  	int			use_pio;
> > +	int			fast_mode;
> >  };
> >  
> >  #define _IBMR(i2c)	((i2c)->reg_base + 0)
> > @@ -365,7 +366,7 @@ static void i2c_pxa_reset(struct pxa_i2c
> >  	writel(i2c->slave_addr, _ISAR(i2c));
> >  
> >  	/* set control register values */
> > -	writel(I2C_ICR_INIT, _ICR(i2c));
> > +	writel(I2C_ICR_INIT | (i2c->fast_mode ? ICR_FM : 0), _ICR(i2c));
> >  
> >  #ifdef CONFIG_I2C_PXA_SLAVE
> >  	dev_info(&i2c->adap.dev, "Enabling slave mode\n");
> > @@ -1041,6 +1042,7 @@ static int i2c_pxa_probe(struct platform
> >  	if (plat) {
> >  		i2c->adap.class = plat->class;
> >  		i2c->use_pio = plat->use_pio;
> > +		i2c->fast_mode = plat->fast_mode;
> >  	}
> >  
> >  	if (i2c->use_pio) {
> > 
> > 
> > 
> > _______________________________________________
> > i2c mailing list
> > i2c at lm-sensors.org
> > http://lists.lm-sensors.org/mailman/listinfo/i2c
> 
> 
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-- 
Ben (ben at fluff.org, http://www.fluff.org/)

  'a smiley only costs 4 bytes'