On Wed, Nov 16, 2022 at 10:36:27AM +0000, Mark Brown wrote:
On Tue, Nov 15, 2022 at 09:38:07PM -0800, Dmitry Torokhov wrote:
Switch the driver from legacy gpio API that is deprecated to the newer gpiod API that respects line polarities described in ACPI/DT.
- if (gpio_is_valid(priv->reset_gpio))
gpio_set_value(priv->reset_gpio, 1);
- if (priv->reset_gpio)
gpiod_set_value(priv->reset_gpio, 0);How are we ensuring that people have described signals as active low/high in existing DTs, and are we positive that the signal is described as active low for all devices? In particular if the signal is described as a reset signal then it's active high even if we want it low while the device is actually in use.
I have been going through in-kernel DTSes and adjusting ones that are incorrect. For external ones I think we should take a pragmatic approach and say that if driver has last non-mechanical update in 2014 and there are no users submitted to mainline since then (as this one), then it is highly unlikely that devices currently using this component/codec will be updated to the 6.2+ kernel even if they are still in service. And if this does happen the breakage will be immediately obvious as we'll keep the codec in reset state.
But if you really want to I can add quirk(s) to gpiolib forcing this line to be treated as active-low regardless of what specified in DTS. This kind of negates benefit of going to gpiod though.
Please let me know.