[PATCH v2 07/11] gpio: stmfx: add function stmfx_read_reg and stmfx_write_reg

[Patrice CHOTARD <patrice.chotard@st.com>]

Hi Patrick

On 6/4/20 2:30 PM, Patrick Delaunay wrote:
> Add the helper functions stmfx_read_reg() and stmfx_write_reg() to avoid
> duplicated code for access to stmfx's register with mask.
>
> Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
> ---
>
> Changes in v2:
> - NEW: split previous patch [5/5] gpio: stmfx: add set_config ops
>
>  drivers/pinctrl/pinctrl-stmfx.c | 68 +++++++++++++--------------------
>  1 file changed, 26 insertions(+), 42 deletions(-)
>
> diff --git a/drivers/pinctrl/pinctrl-stmfx.c b/drivers/pinctrl/pinctrl-stmfx.c
> index 657ca2e240..5d15424b84 100644
> --- a/drivers/pinctrl/pinctrl-stmfx.c
> +++ b/drivers/pinctrl/pinctrl-stmfx.c
> @@ -74,43 +74,49 @@ static int stmfx_write(struct udevice *dev, uint offset, unsigned int val)
>  	return dm_i2c_reg_write(dev_get_parent(dev), offset, val);
>  }
>  
> -static int stmfx_conf_set_pupd(struct udevice *dev, unsigned int pin, u32 pupd)
> +static int stmfx_read_reg(struct udevice *dev, u8 reg_base, uint offset)
>  {
> -	u8 reg = STMFX_REG_GPIO_PUPD + get_reg(pin);
> -	u32 mask = get_mask(pin);
> +	u8 reg = reg_base + get_reg(offset);
> +	u32 mask = get_mask(offset);
>  	int ret;
>  
>  	ret = stmfx_read(dev, reg);
>  	if (ret < 0)
>  		return ret;
> -	ret = (ret & ~mask) | (pupd ? mask : 0);
>  
> -	return stmfx_write(dev, reg, ret);
> +	return ret < 0 ? ret : !!(ret & mask);
>  }
>  
> -static int stmfx_conf_set_type(struct udevice *dev, unsigned int pin, u32 type)
> +static int stmfx_write_reg(struct udevice *dev, u8 reg_base, uint offset,
> +			   uint val)
>  {
> -	u8 reg = STMFX_REG_GPIO_TYPE + get_reg(pin);
> -	u32 mask = get_mask(pin);
> +	u8 reg = reg_base + get_reg(offset);
> +	u32 mask = get_mask(offset);
>  	int ret;
>  
>  	ret = stmfx_read(dev, reg);
>  	if (ret < 0)
>  		return ret;
> -	ret = (ret & ~mask) | (type ? mask : 0);
> +	ret = (ret & ~mask) | (val ? mask : 0);
>  
>  	return stmfx_write(dev, reg, ret);
>  }
>  
> -static int stmfx_gpio_get(struct udevice *dev, unsigned int offset)
> +static int stmfx_conf_set_pupd(struct udevice *dev, unsigned int offset,
> +			       uint pupd)
>  {
> -	u32 reg = STMFX_REG_GPIO_STATE + get_reg(offset);
> -	u32 mask = get_mask(offset);
> -	int ret;
> +	return stmfx_write_reg(dev, STMFX_REG_GPIO_PUPD, offset, pupd);
> +}
>  
> -	ret = stmfx_read(dev, reg);
> +static int stmfx_conf_set_type(struct udevice *dev, unsigned int offset,
> +			       uint type)
> +{
> +	return stmfx_write_reg(dev, STMFX_REG_GPIO_TYPE, offset, type);
> +}
>  
> -	return ret < 0 ? ret : !!(ret & mask);
> +static int stmfx_gpio_get(struct udevice *dev, unsigned int offset)
> +{
> +	return stmfx_read_reg(dev, STMFX_REG_GPIO_STATE, offset);
>  }
>  
>  static int stmfx_gpio_set(struct udevice *dev, unsigned int offset, int value)
> @@ -123,50 +129,28 @@ static int stmfx_gpio_set(struct udevice *dev, unsigned int offset, int value)
>  
>  static int stmfx_gpio_get_function(struct udevice *dev, unsigned int offset)
>  {
> -	u32 reg = STMFX_REG_GPIO_DIR + get_reg(offset);
> -	u32 mask = get_mask(offset);
> -	int ret;
> -
> -	ret = stmfx_read(dev, reg);
> +	int ret = stmfx_read_reg(dev, STMFX_REG_GPIO_DIR, offset);
>  
>  	if (ret < 0)
>  		return ret;
>  	/* On stmfx, gpio pins direction is (0)input, (1)output. */
>  
> -	return ret & mask ? GPIOF_OUTPUT : GPIOF_INPUT;
> +	return ret ? GPIOF_OUTPUT : GPIOF_INPUT;
>  }
>  
>  static int stmfx_gpio_direction_input(struct udevice *dev, unsigned int offset)
>  {
> -	u32 reg = STMFX_REG_GPIO_DIR + get_reg(offset);
> -	u32 mask = get_mask(offset);
> -	int ret;
> -
> -	ret = stmfx_read(dev, reg);
> -	if (ret < 0)
> -		return ret;
> -
> -	ret &= ~mask;
> -
> -	return stmfx_write(dev, reg, ret & ~mask);
> +	return stmfx_write_reg(dev, STMFX_REG_GPIO_DIR, offset, 0);
>  }
>  
>  static int stmfx_gpio_direction_output(struct udevice *dev,
>  				       unsigned int offset, int value)
>  {
> -	u32 reg = STMFX_REG_GPIO_DIR + get_reg(offset);
> -	u32 mask = get_mask(offset);
> -	int ret;
> -
> -	ret = stmfx_gpio_set(dev, offset, value);
> -	if (ret < 0)
> -		return ret;
> -
> -	ret = stmfx_read(dev, reg);
> +	int ret = stmfx_gpio_set(dev, offset, value);
>  	if (ret < 0)
>  		return ret;
>  
> -	return stmfx_write(dev, reg, ret | mask);
> +	return stmfx_write_reg(dev, STMFX_REG_GPIO_DIR, offset, 1);
>  }
>  
>  static int stmfx_gpio_probe(struct udevice *dev)

Reviewed-by: Patrice Chotard <patrice.chotard@st.com>

Thanks