[U-Boot] [PATCH 03/20] dm: i2c: Add functions to read and write a register

[Heiko Schocher <hs@denx.de>]

Hello Simon,

Am 20.04.2015 20:37, schrieb Simon Glass:
> Add driver model versions of the legacy functions to read and write a
> single byte register. These are a useful shortcut in many cases.
>
> Signed-off-by: Simon Glass <sjg@chromium.org>
> ---
>
>   drivers/i2c/i2c-uclass.c | 19 +++++++++++++++++++
>   include/i2c.h            | 21 +++++++++++++++++++++
>   2 files changed, 40 insertions(+)

Acked-by: Heiko Schocher <hs@denx.de>

bye,
Heiko
>
> diff --git a/drivers/i2c/i2c-uclass.c b/drivers/i2c/i2c-uclass.c
> index f2e95c0..b8eb2d6 100644
> --- a/drivers/i2c/i2c-uclass.c
> +++ b/drivers/i2c/i2c-uclass.c
> @@ -186,6 +186,25 @@ int dm_i2c_write(struct udevice *dev, uint offset, const uint8_t *buffer,
>   	}
>   }
>
> +int dm_i2c_reg_read(struct udevice *dev, uint offset)
> +{
> +	uint8_t val;
> +	int ret;
> +
> +	ret = dm_i2c_read(dev, offset, &val, 1);
> +	if (ret < 0)
> +		return ret;
> +
> +	return val;
> +}
> +
> +int dm_i2c_reg_write(struct udevice *dev, uint offset, uint value)
> +{
> +	uint8_t val = value;
> +
> +	return dm_i2c_write(dev, offset, &val, 1);
> +}
> +
>   /**
>    * i2c_probe_chip() - probe for a chip on a bus
>    *
> diff --git a/include/i2c.h b/include/i2c.h
> index 6fd73fa..d794057 100644
> --- a/include/i2c.h
> +++ b/include/i2c.h
> @@ -124,6 +124,27 @@ int dm_i2c_probe(struct udevice *bus, uint chip_addr, uint chip_flags,
>   		 struct udevice **devp);
>
>   /**
> + * dm_i2c_reg_read() - Read a value from an I2C register
> + *
> + * This reads a single value from the given address in an I2C chip
> + *
> + * @addr:	Address to read from
> + * @return value read, or -ve on error
> + */
> +int dm_i2c_reg_read(struct udevice *dev, uint offset);
> +
> +/**
> + * dm_i2c_reg_write() - Write a value to an I2C register
> + *
> + * This writes a single value to the given address in an I2C chip
> + *
> + * @addr:	Address to write to
> + * @val:	Value to write (normally a byte)
> + * @return 0 on success, -ve on error
> + */
> +int dm_i2c_reg_write(struct udevice *dev, uint offset, unsigned int val);
> +
> +/**
>    * dm_i2c_set_bus_speed() - set the speed of a bus
>    *
>    * @bus:	Bus to adjust
>

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