On 4/4/2013 10:09 AM, Philip, Avinash wrote: > 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
By controlling above you mean "switching on/off"? Otherwise this seems to be contradicting the statement just before. > 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. Platform callbacks are not possible with DT. You can look at what freescale mxsfb.c does. Look for panel-enable-gpios DT binding. Thanks, Sekhar -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/