On Fri, Apr 23, 2021 at 07:16:45PM +0700, tu pham wrote: > From: Pho Tran <pho.tran@xxxxxxxxxx> > > Similar to other CP210x devices, GPIO interfaces (gpiochip) should be > supported for CP2108. > > CP2108 has 4 serial interfaces but only 1 set of GPIO pins are shared > to all of those interfaces. So, just need to initialize GPIOs of CP2108 > with only one interface (I use interface 0). It means just only 1 gpiochip > device file will be created for CP2108. > > CP2108 has 16 GPIOs, So data types of several variables need to be is u16 > instead of u8(in struct cp210x_serial_private). This doesn't affect other > CP210x devices. > > Because CP2108 has 16 GPIO pins, the parameter passed by cp210x functions > will be different from other CP210x devices. So need to check part number > of the device to use correct data format before sending commands to > devices. > > Like CP2104, CP2108 have GPIO pins with configurable options. Therefore, > should be mask all pins which are not in GPIO mode in cp2108_gpio_init() > function. > > Signed-off-by: Pho Tran <pho.tran@xxxxxxxxxx> When you forward a patch from someone else you need to sign-off on it as well. If you also worked on the patch you can use the Co-Developed-by tag as well. More info here: Documentation/process/submitting-patches.rst Johan
