[PATCH v2] i2c: add pmic_reg_read() for PBL use

[Sascha Hauer]

On Tue, Jan 02, 2024 at 10:15:38AM +0100, Sascha Hauer wrote:
> On Wed, Dec 20, 2023 at 11:47:39AM +0100, Bastian Krause wrote:
> > Add a common PMIC read function to PBL which allows easy porting of
> > U-Boot's pmic_reg_read() in lowlevel board code.
> > 
> > Signed-off-by: Bastian Krause <bst at pengutronix.de>
> > ---
> > Changes since (implicit) v1:
> > - make function static inline as suggested by Ahmad
> > - change void *buf to u32 *val to resemble's U-Boot's pmic_reg_read() as
> >   suggested by Ahmad
> > ---
> >  include/pbl/pmic.h | 24 ++++++++++++++++++++++++
> >  1 file changed, 24 insertions(+)
> > 
> > diff --git a/include/pbl/pmic.h b/include/pbl/pmic.h
> > index 0f882c5649d..4eeee31d46c 100644
> > --- a/include/pbl/pmic.h
> > +++ b/include/pbl/pmic.h
> > @@ -9,6 +9,30 @@ struct pmic_config {
> >  	u8 val;
> >  };
> >  
> > +static inline void pmic_reg_read(struct pbl_i2c *i2c, int addr, u8 reg, u32 *val)
> 
> I didn't notice there is a v2 when replying to v1, so here again:
> 
> Why not make *val a u8 *?

I renamed this to pmic_reg_read8() and changed the data type to u8 *,
see the patch I just sent.

Sascha

> 
> Sascha
> 
> > +{
> > +	int ret;
> > +	u8 buf[1];
> > +	struct i2c_msg msg[] = {
> > +		{
> > +			.addr = addr,
> > +			.buf = &reg,
> > +			.len = 1,
> > +		}, {
> > +			.addr = addr,
> > +			.flags = I2C_M_RD,
> > +			.buf = buf,
> > +			.len = 1,
> > +		},
> > +	};
> > +
> > +	ret = pbl_i2c_xfer(i2c, msg, ARRAY_SIZE(msg));
> > +	if (ret != ARRAY_SIZE(msg))
> > +		pr_err("Failed to read from pmic@%x: %d\n", addr, ret);
> > +
> > +	*val = buf[0];
> > +}
> > +
> >  static void pmic_reg_write(struct pbl_i2c *i2c, int addr, u8 reg, u8 val)
> >  {
> >  	int ret;
> > -- 
> > 2.39.2
> > 
> > 
> > 
> 
> -- 
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> 

-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
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