Hi Yoshihiro, This looks like an elegant solution that I can implement. Many thanks for pointing me in a good direction. > From: Yoshihiro Shimoda, Sent: Tuesday, September 17, 2019 05:39 PM > > Hi Gareth, > > > From: Gareth Williams, Sent: Monday, September 16, 2019 10:56 PM > > > > Hi Laurent/Kieran, > > > > I need to upstream a driver for a display controller that within its > > registers memory region contains registers related to a PWM device. The > PWM device is for controlling the backlight of the display. > > Ideally, I would like to create a separated driver for the PWM, so > > that I can re-use "pwm-backlight", but since the registers for the PWM > > are right in the middle of the registers for the display controller I would > need to ioremap the memory region for the PWM registers region twice, > once from the display controller driver, and once from the PWM driver. > > Do you think that the double ioremap would be acceptable upstream? > > I think that an MFD driver can support such hardware. I checked > Documentation/devicetree/bindings/mfd roughly, and then atmel-hlcdc.txt > seems to have a display controller and a PWM device. > > Best regards, > Yoshihiro Shimoda Best Regards, Gareth Williams _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
