linux-kernel - RE: [PATCH v3 0/3] Platform support for EHRPWM & ECAP devices in DAVINCI.

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Date:	Thu, 4 Apr 2013 04:39:05 +0000
From:	"Philip, Avinash" <avinashphilip@...com>
To:	"Nori, Sekhar" <nsekhar@...com>
CC:	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"Manjunathappa, Prakash" <prakash.pm@...com>,
	"jacmet@...site.dk" <jacmet@...site.dk>
Subject: RE: [PATCH v3 0/3] Platform support for EHRPWM & ECAP devices in
 DAVINCI.

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
>