On Thu, Jun 10, 2021 at 2:18 PM Viresh Kumar viresh.kumar@linaro.org wrote:
From: "Enrico Weigelt, metux IT consult" info@metux.net
This patch adds a new driver for Virtio based GPIO devices.
This allows a guest VM running Linux to access GPIO device provided by the host. It supports all basic operations for now, except interrupts for the GPIO lines.
Signed-off-by: "Enrico Weigelt, metux IT consult" info@metux.net Co-developed-by: Viresh Kumar viresh.kumar@linaro.org Signed-off-by: Viresh Kumar viresh.kumar@linaro.org
Can you give an example of how this would be hooked up to other drivers using those gpios. Can you give an example of how using the "gpio-keys" or "gpio-leds" drivers in combination with virtio-gpio looks like in the DT?
Would qemu simply add the required DT properties to the device node that corresponds to the virtio device in this case?
From what I can tell, both the mmio and pci variants of virtio can have their
dev->of_node populated, but I don't see the logic in register_virtio_device() that looks up the of_node of the virtio_device that the of_gpio code then tries to refer to.
Arnd