tree 78929b3866d2bc0af026c538cd20b72de477c5da
parent 39f8ea46724efbed3ca021863a22337c31be264c
author Geert Uytterhoeven <geert@linux-m68k.org> 1489155318 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1489731049 +0900

auxdisplay: charlcd: Add support for 4-bit interfaces

In 4-bit mode, 8-bit commands and data are written using two raw writes
to the data interface: high nibble first, low nibble last.  This must be
handled by the low-level driver.

However, as we don't know in which mode (4-bit or 8-bit) nor 4-bit phase
the LCD was left, initialization must always be handled using raw
writes, and needs to configure the LCD for 8-bit mode first.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>