Hello Marek, Jul 6, 2023 5:26:15 PM Marek Vasut <marex@xxxxxxx>: > On 7/6/23 17:18, Paulo Pavacic wrote: >> Hello Linus, >> čet, 22. lip 2023. u 10:22 Linus Walleij <linus.walleij@xxxxxxxxxx> napisao je: >>> >>> On Wed, Jun 21, 2023 at 5:09 PM Paulo Pavacic <pavacic.p@xxxxxxxxx> wrote: >>> >>>> A lot of modifications to st7701 are required. I believe it would >>>> result in a driver that doesn't look or work the same. e.g compare >>>> delays between initialization sequences of panel-fannal-c3004 and >>>> panel-st7701. I think it would be optimal to create st7701s driver and >>>> have special handling for st7701s panels. If there was a flag for >>>> whether panel is st7701 or st7701s it would end up looking like a >>>> mess. >>> >>> What matters is if the original authors of the old st7701 driver are >>> around and reviewing and testing patches at all. What we need is >>> active maintainers. (Added Jagan, Marek & Maya). >>> >>> I buy the reasoning that the st7701s is perhaps substantially different >>> from st7701. >>> >>> If st7701s is very different then I suppose it needs a separate driver, >>> then all we need to to name the driver properly, i.e. >>> panel-sitronix-st7701s.c. >> I had in person talk with Paul Kocialkowski and I have concluded that >> this is the best solution. >> I believe I should rename it to st7701s due to the hardware changes. I >> would like to create V5 patch with driver renamed to st7701s. >> Please let me know if you agree / disagree. > > If I recall it right, the ST7701 and ST7701S are basically the same chip, aren't they ? I'm currently exploring all the differences. There aren't a lot of them, but there are some. So far I can see that default register values are different, previously unused registers are now used and there has been some reordering of how info is placed in registers [1] (return value for some commands is different). E.g AJ1N[1:0] has been moved from B102h to B101h [1] Moreover, instructions to some commands have been changed as well as meaning of what data bits mean [2][3]. Also, new features have been added [2]; there is now PCLKS 3 for example. You can see few differences in following images: [1] https://ibb.co/NmgbZmy - GAMACTRL_st7701.png [2] https://ibb.co/G79y235 - PCLKS2.png P.S. this is second time I'm trying to send this e-mail so some of you might have received e-mail with the same text twice Thank you for your time, Paulo
