On Tue, Apr 02, 2013 at 14:05:09, Nori, Sekhar wrote: > On 3/25/2013 1:19 PM, Philip Avinash wrote: > > Add platform support for EHRPWM and ECAP by providing clock nodes and > > device tree nodes. > > This series depends on [1] and [2] and is available for testing at [3]. > > Tested for back light support in da850 EVM with EHRPWM PWM device. > > > > [1] > > http://gitorious.org/linux-davinci/linux-davinci/trees/davinci-for-v3.9/dt-2 > > [2] https://gitorious.org/linux-pwm/linux-pwm/trees/for-next > > [3] > > https://github.com/avinashphilip/am335x_linux/tree/davinci-for-v3.9_soc_pwm > > > > Note: > > DT support for EHRPWM backlight has not been added in da850-evm.dts as > > there is > > conflicting pin-mux requirement with SPI flash. > > Can you check if this is really true even in newer boards (have a look > at the latest schematics)? I remember this used to be a problem in very > early versions but was fixed later.
On looking schematics, panel has three power controls LCD_BACKLIGHT_PWR, LCD_PANEL_PWR, LCD_PWM0. On latest schematic, LCD_PWM0 is connected to ECAP instance 2. So backlight can control through ECAP2 (not conflicting with SPI1 cs0). Still for controlling backlight, require support for LCD_BACKLIGHT_PWR & LCD_PANEL_PWR. These signals to be controlled by GPIO 2[8] & GPIO 2[15]. In release platform callbacks used to control GPIO functionality. But with DT support, I have to check how platform callbacks can be used. Thanks Avinash > > Thanks, > Sekhar >
