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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Mon, 2022-08-22 at 13:28 +0200, Linus Walleij wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you > know the content is safe > > On Mon, Aug 15, 2022 at 2:08 PM wrote: > > > From: Lewis Hanly > > > > Add a driver to support the Polarfire SoC gpio controller > > > > Signed-off-by: Lewis Hanly > > This looks like textbook example of a driver that can use > CONFIG_GPIO_GENERIC > > > +config GPIO_POLARFIRE_SOC > > + bool "Microchip FPGA GPIO support" > > + depends on OF_GPIO > > + select GPIOLIB_IRQCHIP > > select GPIO_GENERIC > > See e.g. drivers/gpio/gpio-ftgpio010.c for an example > of how to use bgpio_init() to set up the helper library to handle > the GPIO side of things and combine it with an irqchip. > You get get/set_multiple() for free with this approach. > Also see documentation for bgpio_init() in > drivers/gpio/gpio-mmio.c. > > Yours, > Linus Walleij Thank you for the feedback. We had looked at the bpgpio_init, our controller is not fully memory mapped to support the bgpio_init() and get all routines for free. While we have in/out and intr (interrupt state) 32-bit registers, we would not get as much free as other generic memory mapped controllers. For details on the gpio controller: https://onlinedocs.microchip.com/pr/GUID-0E320577-28E6-4365-9BB8-9E1416A0A6E4-en-US-3/index.html?GUID-A0214F3C-C68A-45A9-B81C-4695A58C4A46#GUID-A0214F3C-C68A-45A9-B81C-4695A58C4A46__ID-00000AB0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv