On Fri, Mar 12, 2021 at 02:57:54PM +0100, Enrico Weigelt, metux IT consult wrote: > On 02.03.21 06:30, Drew Fustini wrote: > > Hi folks, > > > Add "pinmux-select" to debugfs which will activate a pin function for a > > given pin group: > > > > echo "<group-name function-name>" > pinmux-select > > > > The write operation pinmux_select() handles this by checking that the > > names map to valid selectors and then calling ops->set_mux(). > > I've already been playing with similar idea, but for external muxes. > For example, some boards have multiple SIM slots that can be switched > via some gpio pin. > > Not sure whether traditional pinmux would be a good match for that. > > > --mtx > Thank you for your comment. I am interested in understanding other use cases. Linus can hopefully correct me, but I think this is covered by section "Drivers needing both pin control and GPIOs" in pinctl.rst [1]. The driver could be both a GPIO consumer and pinctrl consumer and then be able to call pinctrl_select_state() and devm_gpio_request(). Thank you, Drew [1] https://www.kernel.org/doc/html/latest/driver-api/pinctl.html
