sh: pfc: Add gpio_read_bit() for data register access
Introduce gpio_read_bit() for data register read access and modify sh_gpio_get_value() to make use of the new function instead of gpio_read_reg(). The purpose of this change is to update the code to only use the gpio_read_reg() function for config register access. Signed-off-by: NMagnus Damm <damm@opensource.se> Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
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