Hi Sungbo, Am 2020-06-23 08:05, schrieb Sungbo Eo:
This patch adds support for the PCA9570 I2C GPO expander. Signed-off-by: Sungbo Eo <mans0n@xxxxxxxxxx> --- Tested in kernel 5.4 on an ipq40xx platform. This is my first time submitting a whole driver patch, and I'm not really familiar with this PCA expander series. Please let me know how I can improve this patch further. (Do I also need to document the DT compatible string?)
Did you have a look at drivers/gpio/gpio-regmap.c ? Your driver seems to be simple enough to be easily integrated with that. If you need a blueprint; because at the moment there is no driver in the kernel using that, you could have a look at: https://lore.kernel.org/linux-gpio/20200604211039.12689-7-michael@xxxxxxxx/ -michael
