[U-Boot] [PATCH v2 1/3] misc:pmic:core New generic PMIC driver

[Stefano Babic <sbabic@denx.de>]

On 10/04/2011 07:45 AM, Lukasz Majewski wrote:
> I2C or SPI PMIC devices can be accessed.
> Separate files: pmic_i2c.c and pmic_spi.c are responsible
> for handling transmission over I2C or SPI bus.
> 
> New flags:
> CONFIG_PMIC - enable PMIC general device.
> CONFIG_PMIC_I2C/SPI - specify the interface to be used.
> 
> Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
> Cc: Stefano Babic <sbabic@denx.de>
> ---

Hi Lukasz,

> +
> +struct p_spi {
> +	unsigned char cs;
> +	unsigned char mode;
> +	unsigned char bitlen;
> +	unsigned int  clk;
> +	unsigned int  flags;
> +	u32 (*prepare_tx)(u32 reg, u32 *val, u32 write);
> +};
> +
> +struct pmic {
> +	const char *name;
> +	unsigned char bus;
> +	unsigned char interface;
> +	unsigned char number_of_regs;
> +	union hw {
> +		struct p_i2c i2c;
> +		struct p_spi spi;
> +	} hw;
> +};

I have found an issue with this structure. In some case a char is not
enough. The i.MX SPI driver uses the LSB byte to set a chipselect
provided directly by the controller, and the MSB if a GPIO is selected.
You can see an example in efikamx.h. It is better to replace all
unsigned char in this structure with unsigned int to avoid these problems.

Best regards,
Stefano Babic

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