On Fri, Aug 26, 2016 at 03:17:49PM +0100, Paul Burton wrote: > Add a driver for simple ASCII LCD displays found on the MIPS Boston, > Malta & SEAD3 development boards. The Boston display is an independent > memory mapped device with a simple memory mapped 8 byte register space > containing the 8 ASCII characters to display. The Malta display is > exposed as part of the Malta board registers, and provides 8 registers > each of which corresponds to one of the ASCII characters to display. The > SEAD3 display is slightly more complex, exposing an interface to an > S6A0069 LCD controller via registers provided by the boards CPLD. > However although the displays differ in their register interface, we > require similar functionality on each board so abstracting away the > differences within a single driver allows us to share a significant > amount of code & ensure consistent behaviour. > > The driver displays the Linux kernel version as the default message, but > allows the message to be changed via a character device. Messages longer > then the number of characters that the display can show will scroll. > > This provides different behaviour to the existing LCD display code for > the MIPS Malta or MIPS SEAD3 platforms in the following ways: > > - The default string to display is not "LINUX ON MALTA" or "LINUX ON > SEAD3" but "Linux" followed by the version number of the kernel > (UTS_RELEASE). > > - Since that string tends to be significantly longer it scrolls twice > as fast, moving every 500ms rather than every 1s. > > - The LCD won't be updated until the driver is probed, so it doesn't > provide the early "LINUX" string. Right now parts 15..18 of this series are stalled due to the lack of an ack for this patch. Miguel? Ralf
