On Wed, Feb 09, 2022 at 03:17:06PM +0100, Javier Martinez Canillas wrote: > On 2/9/22 14:43, Mark Brown wrote: > > Unless the device supports power being physically omitted regulator > > usage should not be optional, it's just more code and a recipie for poor > > error handling. > The device has a VCC pin but in most cases this is just connected to a > power provided by the board in its pinout header. For example, I've it > connected to a rpi4 3.3v pin. That sounds like a very common configuration. > I guess in that case what we should do then is to just have a regulator > fixed as the vbat-supply in the Device Tree, that's regulator-always-on. Generally I'd suggest labelling things with whatever the supply is called in the board's schematics/documentation, that tends to make things clearer and easier to follow. > The old ssd1307fb fbdev driver also had this as optional and I wanted to > keep the new driver as backward compatible. But I understand now that is > not describing the hardware properly by making this regulator optional. It is depressingly common to see broken code here, unfortunately graphics drivers seem like one of the most common offendors.
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