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

[Bastian Krause]

On 1/2/24 12:32, Sascha Hauer wrote:
> 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.

Works for me, thanks!

Bastian

> 
> 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/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |