[linux-sunxi] Re: [PATCH v2 5/5] ARM: dts: sun6i: Add support for Sinlinx A31s SDK board

2015-10-19 Thread Maxime Ripard 
On Fri, Oct 16, 2015 at 03:25:13PM +0800, Chen-Yu Tsai wrote:
> On Fri, Oct 16, 2015 at 3:20 PM, Maxime Ripard
>  wrote:
> > Hi,
> >
> > On Mon, Oct 12, 2015 at 05:42:10PM +0800, Chen-Yu Tsai wrote:
> >> On Mon, Oct 12, 2015 at 5:30 PM, Maxime Ripard
> >>  wrote:
> >> > Hi,
> >> >
> >> > On Sat, Oct 10, 2015 at 10:49:00PM +0800, Chen-Yu Tsai wrote:
> >> >> + {
> >> >> + /* Available on camera header */
> >> >> + pinctrl-names = "default";
> >> >> + pinctrl-0 = <_pins_a>;
> >> >> + status = "okay";
> >> >> +};
> >> >> +
> >> >> + {
> >> >> + /* Available on LCD header */
> >> >> + pinctrl-names = "default";
> >> >> + pinctrl-0 = <_pins_a>;
> >> >> + status = "okay";
> >> >> +};
> >> >
> >> > Are those two actually used anywhere on the board itself, or just
> >> > exposed on the pin headers?
> >>
> >> They are exposed as grouped headers. 1 header has all the camera
> >> related stuff, like the CSI pins, and various voltage sources
> >> from the PMIC. The other has the LCD pins, resistive touchpanel,
> >> I2C for capacitive touchpanel, and of course voltage sources.
> >>
> >> The LCD header is an FPC connector, while the camera header is
> >> the common (common for sunxi devboards) 2.0mm pins. I'm not sure
> >> if there is some common pinout amongst vendors, but at least
> >> Sinlinx sells their own 7" LCD display w/ CTP, VGA converter,
> >> and camera modules. I have both the LCD and VGA converter.
> >>
> >> Note that these I2C pins have valid external pull-ups. I doubt
> >> they can be easily re-purposed.
> >
> > Still, the policy we've had so far is that if the user can use it for
> > something else (like a GPIO, which is the case here), we don't do
> > enforce any default, and the user will make the right choice.
> 
> To clarify, unless an actual device is connected, forcing a choice,
> we won't make that choice for the user, even if the connector is
> specifically designed for one type of application.
> 
> Did I get that right?

Yep.

Maxime

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Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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[linux-sunxi] Re: [PATCH v2 5/5] ARM: dts: sun6i: Add support for Sinlinx A31s SDK board

2015-10-16 Thread Maxime Ripard 
Hi,

On Mon, Oct 12, 2015 at 05:42:10PM +0800, Chen-Yu Tsai wrote:
> On Mon, Oct 12, 2015 at 5:30 PM, Maxime Ripard
>  wrote:
> > Hi,
> >
> > On Sat, Oct 10, 2015 at 10:49:00PM +0800, Chen-Yu Tsai wrote:
> >> + {
> >> + /* Available on camera header */
> >> + pinctrl-names = "default";
> >> + pinctrl-0 = <_pins_a>;
> >> + status = "okay";
> >> +};
> >> +
> >> + {
> >> + /* Available on LCD header */
> >> + pinctrl-names = "default";
> >> + pinctrl-0 = <_pins_a>;
> >> + status = "okay";
> >> +};
> >
> > Are those two actually used anywhere on the board itself, or just
> > exposed on the pin headers?
> 
> They are exposed as grouped headers. 1 header has all the camera
> related stuff, like the CSI pins, and various voltage sources
> from the PMIC. The other has the LCD pins, resistive touchpanel,
> I2C for capacitive touchpanel, and of course voltage sources.
> 
> The LCD header is an FPC connector, while the camera header is
> the common (common for sunxi devboards) 2.0mm pins. I'm not sure
> if there is some common pinout amongst vendors, but at least
> Sinlinx sells their own 7" LCD display w/ CTP, VGA converter,
> and camera modules. I have both the LCD and VGA converter.
> 
> Note that these I2C pins have valid external pull-ups. I doubt
> they can be easily re-purposed.

Still, the policy we've had so far is that if the user can use it for
something else (like a GPIO, which is the case here), we don't do
enforce any default, and the user will make the right choice.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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[linux-sunxi] Re: [PATCH v2 5/5] ARM: dts: sun6i: Add support for Sinlinx A31s SDK board

2015-10-16 Thread Chen-Yu Tsai 
On Fri, Oct 16, 2015 at 3:20 PM, Maxime Ripard
 wrote:
> Hi,
>
> On Mon, Oct 12, 2015 at 05:42:10PM +0800, Chen-Yu Tsai wrote:
>> On Mon, Oct 12, 2015 at 5:30 PM, Maxime Ripard
>>  wrote:
>> > Hi,
>> >
>> > On Sat, Oct 10, 2015 at 10:49:00PM +0800, Chen-Yu Tsai wrote:
>> >> + {
>> >> + /* Available on camera header */
>> >> + pinctrl-names = "default";
>> >> + pinctrl-0 = <_pins_a>;
>> >> + status = "okay";
>> >> +};
>> >> +
>> >> + {
>> >> + /* Available on LCD header */
>> >> + pinctrl-names = "default";
>> >> + pinctrl-0 = <_pins_a>;
>> >> + status = "okay";
>> >> +};
>> >
>> > Are those two actually used anywhere on the board itself, or just
>> > exposed on the pin headers?
>>
>> They are exposed as grouped headers. 1 header has all the camera
>> related stuff, like the CSI pins, and various voltage sources
>> from the PMIC. The other has the LCD pins, resistive touchpanel,
>> I2C for capacitive touchpanel, and of course voltage sources.
>>
>> The LCD header is an FPC connector, while the camera header is
>> the common (common for sunxi devboards) 2.0mm pins. I'm not sure
>> if there is some common pinout amongst vendors, but at least
>> Sinlinx sells their own 7" LCD display w/ CTP, VGA converter,
>> and camera modules. I have both the LCD and VGA converter.
>>
>> Note that these I2C pins have valid external pull-ups. I doubt
>> they can be easily re-purposed.
>
> Still, the policy we've had so far is that if the user can use it for
> something else (like a GPIO, which is the case here), we don't do
> enforce any default, and the user will make the right choice.

To clarify, unless an actual device is connected, forcing a choice,
we won't make that choice for the user, even if the connector is
specifically designed for one type of application.

Did I get that right?

Thanks

ChenYu

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[linux-sunxi] Re: [PATCH v2 5/5] ARM: dts: sun6i: Add support for Sinlinx A31s SDK board

2015-10-12 Thread Maxime Ripard 
Hi,

On Sat, Oct 10, 2015 at 10:49:00PM +0800, Chen-Yu Tsai wrote:
> + {
> + /* Available on camera header */
> + pinctrl-names = "default";
> + pinctrl-0 = <_pins_a>;
> + status = "okay";
> +};
> +
> + {
> + /* Available on LCD header */
> + pinctrl-names = "default";
> + pinctrl-0 = <_pins_a>;
> + status = "okay";
> +};

Are those two actually used anywhere on the board itself, or just
exposed on the pin headers?

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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[linux-sunxi] Re: [PATCH v2 5/5] ARM: dts: sun6i: Add support for Sinlinx A31s SDK board

2015-10-12 Thread Chen-Yu Tsai 
On Mon, Oct 12, 2015 at 5:30 PM, Maxime Ripard
 wrote:
> Hi,
>
> On Sat, Oct 10, 2015 at 10:49:00PM +0800, Chen-Yu Tsai wrote:
>> + {
>> + /* Available on camera header */
>> + pinctrl-names = "default";
>> + pinctrl-0 = <_pins_a>;
>> + status = "okay";
>> +};
>> +
>> + {
>> + /* Available on LCD header */
>> + pinctrl-names = "default";
>> + pinctrl-0 = <_pins_a>;
>> + status = "okay";
>> +};
>
> Are those two actually used anywhere on the board itself, or just
> exposed on the pin headers?

They are exposed as grouped headers. 1 header has all the camera
related stuff, like the CSI pins, and various voltage sources
from the PMIC. The other has the LCD pins, resistive touchpanel,
I2C for capacitive touchpanel, and of course voltage sources.

The LCD header is an FPC connector, while the camera header is
the common (common for sunxi devboards) 2.0mm pins. I'm not sure
if there is some common pinout amongst vendors, but at least
Sinlinx sells their own 7" LCD display w/ CTP, VGA converter,
and camera modules. I have both the LCD and VGA converter.

Note that these I2C pins have valid external pull-ups. I doubt
they can be easily re-purposed.

Regards
ChenYu

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