On Wed, Jan 6, 2021 at 12:37 PM Ralf Schlatterbeck <rsc@xxxxxxxxxx> wrote: > > The Hitachi HD44780 is often used together with a PCF8574 based I2C > I/O expander. It was non-obvious to me that the existing parallel > connected version of the auxdisplay driver can already handle this > configuration with appropriate device tree magic. This patch documents > the necessary incantations in an example. > > That this is not only non-obvious to me is documented by at least two > I2C kernel implementations for the display out there. > > Thanks to Geert Uytterhoeven for pointing out how this is done. > Thanks to Miguel Ojeda for extensively commenting on my previous patch. You're welcome! A couple tips: - Normally, you will want to use scripts/get_maintainer.pl to know to whom send a given change. In this case, I am Cc'ing Rob, Geert and the devicetree mailing list which were missing. - Also, for single patches, typically you would want to send the patch without a cover letter. If you want to put comments that shouldn't go into the commit, you can write them just below the "---" line. Thank you for contributing to the kernel and welcome! Cheers, Miguel
