Hi, On 27/07/2019 10:48:06+0200, marcus.wolf@xxxxxxxxxxxxxxxxxxxxx wrote: > Hello Alessandro, hello Alexandre, > > in a product of a customer of mine, the RX-8025T real time clock from Epson > Toyocom is used. > > My customer would like me to integrate the driver for this clock to mainline of > the kernel. > > At the moment, we have a seperate implementation, basing on the implemenattion > of the existing RX-8025 driver. > > Although the rtc of my customer has almost the same "name" as the one, the > current driver is available for (just last letter differs), it works quite > different. So for example I compared the registerset of the two clocks.Only 5 > of 16 registers are identical, 3 are very similar, but the other 8 are > completely different. Also the functionality is quite different. Of course > first of all, both are clocks, but all aditional features are not identical. > The already supported SA type has two alarms - a day and a week alarm. The tyoe > of my customer (t) just has one alarm, that can be switched to day and to week > mode. In adition it has a timer and an 8bit RAM cell. In addition the protocol > how to adress the registers on I2C is different.... > > Would you like me to propose you the support for the RX-8025T as a separate > implementation - aka new driver? I think that what you have is actually a RX-8801SA. Can you check that the register layout is the same? The datasheet is available here: https://support.epson.biz/td/api/doc_check.php?dl=app_RX-8801SA&lang=en > On which base you'd like to see the patches? Head of mainline, last stable > (5.2.2), or ....? > v5.3-rc1 or rtc-next. -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
