[PATCH 1/3] dt-bindings: drm/bridge: adv7511: Add regulators for ADV7533

[PATCH 1/3] dt-bindings: drm/bridge: adv7511: Add regulators for ADV7533

[Archit Taneja]

Add the regulator supply properties needed for ADV7533. The regulator
names are named after the pin names. The exact use of each supply isn't
clear from the data sheets.

The regulators are specified as optional properties since there can
be boards which have a fixed supply directly routed to the pins, and
these may not be modelled as regulator supplies.

There might be a similar set of regulators for ADV7511, but we don't
have the docs at the moment to find out what supplies it needs. The
regulator properties needed by ADV7511 can be updated as we get more
data on it.

Cc: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Signed-off-by: Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
index 6532a59..669b6f2 100644
--- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
+++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
@@ -56,6 +56,12 @@ Optional properties:
 - adi,disable-timing-generator: Only for ADV7533. Disables the internal timing
   generator. The chip will rely on the sync signals in the DSI data lanes,
   rather than generate its own timings for HDMI output.
+- avdd-supply: Only for ADV7533. A 1.8V supply that powers up the AVDD, DVDD
+  PVDD and A2VDD pins on the chip.
+- v1p2-supply: Only for ADV7533. A supply that powers up the V1P2 pin on the
+  chip. Can be either 1.2V or 1.8V.
+- v3p3-supply: Only for ADV7533. A 3.3V supply that powers up the V3P3 pin on
+  the chip.
 
 Required nodes:
 
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Re: [PATCH 1/3] dt-bindings: drm/bridge: adv7511: Add regulators for ADV7533

[Rob Herring]

On Wed, Aug 31, 2016 at 04:22:08PM +0530, Archit Taneja wrote:
> Add the regulator supply properties needed for ADV7533. The regulator
> names are named after the pin names. The exact use of each supply isn't
> clear from the data sheets.
> 
> The regulators are specified as optional properties since there can
> be boards which have a fixed supply directly routed to the pins, and
> these may not be modelled as regulator supplies.
> 
> There might be a similar set of regulators for ADV7511, but we don't
> have the docs at the moment to find out what supplies it needs. The
> regulator properties needed by ADV7511 can be updated as we get more
> data on it.

The ADV7510 is available and there's a pinout comparison with the 7511:

http://www.analog.com/media/en/technical-documentation/evaluation-documentation/ADV7510_to_ADV7511_differences.pdf

These 2 seem to have the same supplies...

> 
> Cc: Rob Herring <robh@kernel.org>
> Cc: devicetree@vger.kernel.org
> Signed-off-by: Archit Taneja <architt@codeaurora.org>
> ---
>  Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> index 6532a59..669b6f2 100644
> --- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> +++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> @@ -56,6 +56,12 @@ Optional properties:
>  - adi,disable-timing-generator: Only for ADV7533. Disables the internal timing
>    generator. The chip will rely on the sync signals in the DSI data lanes,
>    rather than generate its own timings for HDMI output.
> +- avdd-supply: Only for ADV7533. A 1.8V supply that powers up the AVDD, DVDD
> +  PVDD and A2VDD pins on the chip.

This sounds wrong. Each input to the chip should be a property even if 
they are typically from the same supply.

The 7511 has DVDD, AVDD, and PVDD.

> +- v1p2-supply: Only for ADV7533. A supply that powers up the V1P2 pin on the
> +  chip. Can be either 1.2V or 1.8V.

This appears to be 7533 specific.

> +- v3p3-supply: Only for ADV7533. A 3.3V supply that powers up the V3P3 pin on
> +  the chip.

DVDD_3V on 7511

7510/7511 also have BGVDD (for Bandgap). Not clear what the voltage is.

Rob

Re: [PATCH 1/3] dt-bindings: drm/bridge: adv7511: Add regulators for ADV7533

[Archit Taneja]

On 09/02/2016 09:26 PM, Rob Herring wrote:
> On Wed, Aug 31, 2016 at 04:22:08PM +0530, Archit Taneja wrote:
>> Add the regulator supply properties needed for ADV7533. The regulator
>> names are named after the pin names. The exact use of each supply isn't
>> clear from the data sheets.
>>
>> The regulators are specified as optional properties since there can
>> be boards which have a fixed supply directly routed to the pins, and
>> these may not be modelled as regulator supplies.
>>
>> There might be a similar set of regulators for ADV7511, but we don't
>> have the docs at the moment to find out what supplies it needs. The
>> regulator properties needed by ADV7511 can be updated as we get more
>> data on it.
>
> The ADV7510 is available and there's a pinout comparison with the 7511:
>
> http://www.analog.com/media/en/technical-documentation/evaluation-documentation/ADV7510_to_ADV7511_differences.pdf
>
> These 2 seem to have the same supplies...

Thanks. I'll use this.

>
>>
>> Cc: Rob Herring <robh@kernel.org>
>> Cc: devicetree@vger.kernel.org
>> Signed-off-by: Archit Taneja <architt@codeaurora.org>
>> ---
>>   Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>> index 6532a59..669b6f2 100644
>> --- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>> +++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>> @@ -56,6 +56,12 @@ Optional properties:
>>   - adi,disable-timing-generator: Only for ADV7533. Disables the internal timing
>>     generator. The chip will rely on the sync signals in the DSI data lanes,
>>     rather than generate its own timings for HDMI output.
>> +- avdd-supply: Only for ADV7533. A 1.8V supply that powers up the AVDD, DVDD
>> +  PVDD and A2VDD pins on the chip.
>
> This sounds wrong. Each input to the chip should be a property even if
> they are typically from the same supply.

I'll create an entry for each.

>
> The 7511 has DVDD, AVDD, and PVDD.
>
>> +- v1p2-supply: Only for ADV7533. A supply that powers up the V1P2 pin on the
>> +  chip. Can be either 1.2V or 1.8V.
>
> This appears to be 7533 specific.
>
>> +- v3p3-supply: Only for ADV7533. A 3.3V supply that powers up the V3P3 pin on
>> +  the chip.
>
> DVDD_3V on 7511
>
> 7510/7511 also have BGVDD (for Bandgap). Not clear what the voltage is.

I'll add this regulator, and mention that we don't know
what the voltage is.

>
> Rob
>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

[PATCH v2 1/4] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Archit Taneja]

Add the regulator supply properties needed by ADV7511 and ADV7533. The
regulator names are named after the pin names, except for DVDD_3V on
ADV7511, which is left v3p3 to have the same name as it's on ADV7533.

ADV7511 has a BGVDD pin for which the voltage to be configured isn't
clear. This needs to be updated in the document later.

The regulators are specified as optional properties since there can
be boards which have a fixed supply directly routed to the pins, and
these may not be modelled as regulator supplies.

Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Archit Taneja <architt@codeaurora.org>
---
v2:
- Specify regulator supplies for ADV7511 too.
- Have separate supply entries for AVDD, DVDD, PVDD, A2VDD pins.
- Add additional BGVDD supply for ADV7511.

 .../devicetree/bindings/display/bridge/adi,adv7511.txt     | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
index 6532a59..66e6bae 100644
--- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
+++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
@@ -56,6 +56,20 @@ Optional properties:
 - adi,disable-timing-generator: Only for ADV7533. Disables the internal timing
   generator. The chip will rely on the sync signals in the DSI data lanes,
   rather than generate its own timings for HDMI output.
+- avdd-supply: A 1.8V supply that powers up the AVDD pin on the chip.
+- dvdd-supply: A 1.8V supply that powers up the DVDD pin on the chip.
+- pvdd-supply: A 1.8V supply that powers up the PVDD pin on the chip.
+- v3p3-supply: A 3.3V supply that powers up the pin called DVDD_3V on
+  ADV7511 and V3P3 on ADV7533.
+
+ADV7511 specific supplies:
+- bgvdd-supply: Powers the BGVDD pin. The voltage isn't clear from
+  available datasheets.
+
+ADV7533 specific supplies:
+- a2vdd-supply: 1.8V supply that powers up the A2VDD pin on the chip.
+- v1p2-supply: A supply that powers up the V1P2 pin on the chip. It can be
+  either 1.2V or 1.8V.
 
 Required nodes:
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation

Re: [PATCH v2 1/4] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Rob Herring]

On Fri, Sep 23, 2016 at 02:50:27PM +0530, Archit Taneja wrote:
> Add the regulator supply properties needed by ADV7511 and ADV7533. The
> regulator names are named after the pin names, except for DVDD_3V on
> ADV7511, which is left v3p3 to have the same name as it's on ADV7533.
> 
> ADV7511 has a BGVDD pin for which the voltage to be configured isn't
> clear. This needs to be updated in the document later.
> 
> The regulators are specified as optional properties since there can
> be boards which have a fixed supply directly routed to the pins, and
> these may not be modelled as regulator supplies.
> 
> Cc: Rob Herring <robh@kernel.org>
> Cc: devicetree@vger.kernel.org
> Signed-off-by: Archit Taneja <architt@codeaurora.org>
> ---
> v2:
> - Specify regulator supplies for ADV7511 too.
> - Have separate supply entries for AVDD, DVDD, PVDD, A2VDD pins.
> - Add additional BGVDD supply for ADV7511.
> 
>  .../devicetree/bindings/display/bridge/adi,adv7511.txt     | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v2 1/4] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Laurent Pinchart]

Hi Archit,

Thank you for the patch.

On Friday 23 Sep 2016 14:50:27 Archit Taneja wrote:
> Add the regulator supply properties needed by ADV7511 and ADV7533. The
> regulator names are named after the pin names, except for DVDD_3V on
> ADV7511, which is left v3p3 to have the same name as it's on ADV7533.
> 
> ADV7511 has a BGVDD pin for which the voltage to be configured isn't
> clear. This needs to be updated in the document later.
> 
> The regulators are specified as optional properties since there can
> be boards which have a fixed supply directly routed to the pins, and
> these may not be modelled as regulator supplies.
> 
> Cc: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> Signed-off-by: Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> ---
> v2:
> - Specify regulator supplies for ADV7511 too.
> - Have separate supply entries for AVDD, DVDD, PVDD, A2VDD pins.
> - Add additional BGVDD supply for ADV7511.
> 
>  .../devicetree/bindings/display/bridge/adi,adv7511.txt     | 14 +++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git
> a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt index
> 6532a59..66e6bae 100644
> --- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> +++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> @@ -56,6 +56,20 @@ Optional properties:
>  - adi,disable-timing-generator: Only for ADV7533. Disables the internal
> timing generator. The chip will rely on the sync signals in the DSI data
> lanes, rather than generate its own timings for HDMI output.
> +- avdd-supply: A 1.8V supply that powers up the AVDD pin on the chip.
> +- dvdd-supply: A 1.8V supply that powers up the DVDD pin on the chip.
> +- pvdd-supply: A 1.8V supply that powers up the PVDD pin on the chip.
> +- v3p3-supply: A 3.3V supply that powers up the pin called DVDD_3V on
> +  ADV7511 and V3P3 on ADV7533.
> +
> +ADV7511 specific supplies:
> +- bgvdd-supply: Powers the BGVDD pin. The voltage isn't clear from
> +  available datasheets.

It's a 1.8V supply. The ADV7511 hardware user's guide recommends tying it to 
the PVDD supply, so I'm not sure we need a separate supply in DT.

Similarly, the user's guide recommends supplying the AVDD, DVDD and PVDD pins 
with a single 1.8V LDO and three independent filters. We could thus possibly 
combine them into a single 1.8V supply.

> +ADV7533 specific supplies:
> +- a2vdd-supply: 1.8V supply that powers up the A2VDD pin on the chip.
> +- v1p2-supply: A supply that powers up the V1P2 pin on the chip. It can be
> +  either 1.2V or 1.8V.
> 
>  Required nodes:

-- 
Regards,

Laurent Pinchart

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Re: [PATCH v2 1/4] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Archit Taneja]

Hi Laurent,

On 9/25/2016 10:58 PM, Laurent Pinchart wrote:
> Hi Archit,
>
> Thank you for the patch.
>
> On Friday 23 Sep 2016 14:50:27 Archit Taneja wrote:
>> Add the regulator supply properties needed by ADV7511 and ADV7533. The
>> regulator names are named after the pin names, except for DVDD_3V on
>> ADV7511, which is left v3p3 to have the same name as it's on ADV7533.
>>
>> ADV7511 has a BGVDD pin for which the voltage to be configured isn't
>> clear. This needs to be updated in the document later.
>>
>> The regulators are specified as optional properties since there can
>> be boards which have a fixed supply directly routed to the pins, and
>> these may not be modelled as regulator supplies.
>>
>> Cc: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
>> Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
>> Signed-off-by: Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
>> ---
>> v2:
>> - Specify regulator supplies for ADV7511 too.
>> - Have separate supply entries for AVDD, DVDD, PVDD, A2VDD pins.
>> - Add additional BGVDD supply for ADV7511.
>>
>>   .../devicetree/bindings/display/bridge/adi,adv7511.txt     | 14 +++++++++++
>>   1 file changed, 14 insertions(+)
>>
>> diff --git
>> a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>> b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt index
>> 6532a59..66e6bae 100644
>> --- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>> +++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>> @@ -56,6 +56,20 @@ Optional properties:
>>   - adi,disable-timing-generator: Only for ADV7533. Disables the internal
>> timing generator. The chip will rely on the sync signals in the DSI data
>> lanes, rather than generate its own timings for HDMI output.
>> +- avdd-supply: A 1.8V supply that powers up the AVDD pin on the chip.
>> +- dvdd-supply: A 1.8V supply that powers up the DVDD pin on the chip.
>> +- pvdd-supply: A 1.8V supply that powers up the PVDD pin on the chip.
>> +- v3p3-supply: A 3.3V supply that powers up the pin called DVDD_3V on
>> +  ADV7511 and V3P3 on ADV7533.
>> +
>> +ADV7511 specific supplies:
>> +- bgvdd-supply: Powers the BGVDD pin. The voltage isn't clear from
>> +  available datasheets.
>
> It's a 1.8V supply. The ADV7511 hardware user's guide recommends tying it to
> the PVDD supply, so I'm not sure we need a separate supply in DT.

Thanks for providing the info. I'll update it in the doc.

>
> Similarly, the user's guide recommends supplying the AVDD, DVDD and PVDD pins
> with a single 1.8V LDO and three independent filters. We could thus possibly
> combine them into a single 1.8V supply.
>

I'd originally specified only one AVDD supply for all the 1.8 V
supplies, but Rob had recommended using separate supplies for each pin.

I guess it doesn't do much harm specifying separate supplies, a
board can just provide avdd-supply, and the rest would be assumed dummy.
It could also help describe boards which may not have followed the
user guide's recommendation, but I agree that's probably a rare
scenario.

Is it okay if we stick with multiple supplies as it is in this version?

Thanks for the review.

Archit

>> +ADV7533 specific supplies:
>> +- a2vdd-supply: 1.8V supply that powers up the A2VDD pin on the chip.
>> +- v1p2-supply: A supply that powers up the V1P2 pin on the chip. It can be
>> +  either 1.2V or 1.8V.
>>
>>   Required nodes:
>

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Re: [PATCH v2 1/4] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Laurent Pinchart]

Hi Archit,

On Monday 26 Sep 2016 12:10:11 Archit Taneja wrote:
> On 9/25/2016 10:58 PM, Laurent Pinchart wrote:
> > On Friday 23 Sep 2016 14:50:27 Archit Taneja wrote:
> >> Add the regulator supply properties needed by ADV7511 and ADV7533. The
> >> regulator names are named after the pin names, except for DVDD_3V on
> >> ADV7511, which is left v3p3 to have the same name as it's on ADV7533.
> >> 
> >> ADV7511 has a BGVDD pin for which the voltage to be configured isn't
> >> clear. This needs to be updated in the document later.
> >> 
> >> The regulators are specified as optional properties since there can
> >> be boards which have a fixed supply directly routed to the pins, and
> >> these may not be modelled as regulator supplies.
> >> 
> >> Cc: Rob Herring <robh@kernel.org>
> >> Cc: devicetree@vger.kernel.org
> >> Signed-off-by: Archit Taneja <architt@codeaurora.org>
> >> ---
> >> v2:
> >> - Specify regulator supplies for ADV7511 too.
> >> - Have separate supply entries for AVDD, DVDD, PVDD, A2VDD pins.
> >> - Add additional BGVDD supply for ADV7511.
> >> 
> >>   .../devicetree/bindings/display/bridge/adi,adv7511.txt     | 14 +++++++
> >>   1 file changed, 14 insertions(+)
> >> 
> >> diff --git
> >> a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> >> b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt index
> >> 6532a59..66e6bae 100644
> >> --- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> >> +++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> >> 
> >> @@ -56,6 +56,20 @@ Optional properties:
> >>   - adi,disable-timing-generator: Only for ADV7533. Disables the internal
> >> 
> >> timing generator. The chip will rely on the sync signals in the DSI data
> >> lanes, rather than generate its own timings for HDMI output.
> >> +- avdd-supply: A 1.8V supply that powers up the AVDD pin on the chip.
> >> +- dvdd-supply: A 1.8V supply that powers up the DVDD pin on the chip.
> >> +- pvdd-supply: A 1.8V supply that powers up the PVDD pin on the chip.
> >> +- v3p3-supply: A 3.3V supply that powers up the pin called DVDD_3V on
> >> +  ADV7511 and V3P3 on ADV7533.
> >> +
> >> +ADV7511 specific supplies:
> >> +- bgvdd-supply: Powers the BGVDD pin. The voltage isn't clear from
> >> +  available datasheets.
> > 
> > It's a 1.8V supply. The ADV7511 hardware user's guide recommends tying it
> > to the PVDD supply, so I'm not sure we need a separate supply in DT.
> 
> Thanks for providing the info. I'll update it in the doc.
> 
> > Similarly, the user's guide recommends supplying the AVDD, DVDD and PVDD
> > pins with a single 1.8V LDO and three independent filters. We could thus
> > possibly combine them into a single 1.8V supply.
> 
> I'd originally specified only one AVDD supply for all the 1.8 V
> supplies, but Rob had recommended using separate supplies for each pin.
> 
> I guess it doesn't do much harm specifying separate supplies, a
> board can just provide avdd-supply, and the rest would be assumed dummy.

DT should use the same regulator phandle for all power supplies in that case, 
not specify a single one.

> It could also help describe boards which may not have followed the
> user guide's recommendation, but I agree that's probably a rare
> scenario.
> 
> Is it okay if we stick with multiple supplies as it is in this version?

It seems overkill to me but I can live with that. I'd remove the bgvdd supply 
though.

Rob, what's your opinion on this ? Is there a specific reason why you prefer 
splitting the 1.8V supply in one supply per pin, when the hardware user's 
guide recommend powering them from the same LDO ?

> >> +ADV7533 specific supplies:
> >> +- a2vdd-supply: 1.8V supply that powers up the A2VDD pin on the chip.
> >> +- v1p2-supply: A supply that powers up the V1P2 pin on the chip. It can
> >> be
> >> +  either 1.2V or 1.8V.
> >> 
> >>   Required nodes:

-- 
Regards,

Laurent Pinchart

Re: [PATCH v2 1/4] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Archit Taneja]

Hi Rob,

On 09/26/2016 01:42 PM, Laurent Pinchart wrote:
> Hi Archit,
>
> On Monday 26 Sep 2016 12:10:11 Archit Taneja wrote:
>> On 9/25/2016 10:58 PM, Laurent Pinchart wrote:
>>> On Friday 23 Sep 2016 14:50:27 Archit Taneja wrote:
>>>> Add the regulator supply properties needed by ADV7511 and ADV7533. The
>>>> regulator names are named after the pin names, except for DVDD_3V on
>>>> ADV7511, which is left v3p3 to have the same name as it's on ADV7533.
>>>>
>>>> ADV7511 has a BGVDD pin for which the voltage to be configured isn't
>>>> clear. This needs to be updated in the document later.
>>>>
>>>> The regulators are specified as optional properties since there can
>>>> be boards which have a fixed supply directly routed to the pins, and
>>>> these may not be modelled as regulator supplies.
>>>>
>>>> Cc: Rob Herring <robh@kernel.org>
>>>> Cc: devicetree@vger.kernel.org
>>>> Signed-off-by: Archit Taneja <architt@codeaurora.org>
>>>> ---
>>>> v2:
>>>> - Specify regulator supplies for ADV7511 too.
>>>> - Have separate supply entries for AVDD, DVDD, PVDD, A2VDD pins.
>>>> - Add additional BGVDD supply for ADV7511.
>>>>
>>>>   .../devicetree/bindings/display/bridge/adi,adv7511.txt     | 14 +++++++
>>>>   1 file changed, 14 insertions(+)
>>>>
>>>> diff --git
>>>> a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>>>> b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt index
>>>> 6532a59..66e6bae 100644
>>>> --- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>>>> +++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>>>>
>>>> @@ -56,6 +56,20 @@ Optional properties:
>>>>   - adi,disable-timing-generator: Only for ADV7533. Disables the internal
>>>>
>>>> timing generator. The chip will rely on the sync signals in the DSI data
>>>> lanes, rather than generate its own timings for HDMI output.
>>>> +- avdd-supply: A 1.8V supply that powers up the AVDD pin on the chip.
>>>> +- dvdd-supply: A 1.8V supply that powers up the DVDD pin on the chip.
>>>> +- pvdd-supply: A 1.8V supply that powers up the PVDD pin on the chip.
>>>> +- v3p3-supply: A 3.3V supply that powers up the pin called DVDD_3V on
>>>> +  ADV7511 and V3P3 on ADV7533.
>>>> +
>>>> +ADV7511 specific supplies:
>>>> +- bgvdd-supply: Powers the BGVDD pin. The voltage isn't clear from
>>>> +  available datasheets.
>>>
>>> It's a 1.8V supply. The ADV7511 hardware user's guide recommends tying it
>>> to the PVDD supply, so I'm not sure we need a separate supply in DT.
>>
>> Thanks for providing the info. I'll update it in the doc.
>>
>>> Similarly, the user's guide recommends supplying the AVDD, DVDD and PVDD
>>> pins with a single 1.8V LDO and three independent filters. We could thus
>>> possibly combine them into a single 1.8V supply.
>>
>> I'd originally specified only one AVDD supply for all the 1.8 V
>> supplies, but Rob had recommended using separate supplies for each pin.
>>
>> I guess it doesn't do much harm specifying separate supplies, a
>> board can just provide avdd-supply, and the rest would be assumed dummy.
>
> DT should use the same regulator phandle for all power supplies in that case,
> not specify a single one.
>
>> It could also help describe boards which may not have followed the
>> user guide's recommendation, but I agree that's probably a rare
>> scenario.
>>
>> Is it okay if we stick with multiple supplies as it is in this version?
>
> It seems overkill to me but I can live with that. I'd remove the bgvdd supply
> though.
>
> Rob, what's your opinion on this ? Is there a specific reason why you prefer
> splitting the 1.8V supply in one supply per pin, when the hardware user's
> guide recommend powering them from the same LDO ?

Could you suggest us which way to go?

Thanks,
Archit

>
>>>> +ADV7533 specific supplies:
>>>> +- a2vdd-supply: 1.8V supply that powers up the A2VDD pin on the chip.
>>>> +- v1p2-supply: A supply that powers up the V1P2 pin on the chip. It can
>>>> be
>>>> +  either 1.2V or 1.8V.
>>>>
>>>>   Required nodes:
>

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH v2 1/4] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Rob Herring]

On Fri, Oct 14, 2016 at 12:40 AM, Archit Taneja <architt@codeaurora.org> wrote:
> Hi Rob,
>
>
> On 09/26/2016 01:42 PM, Laurent Pinchart wrote:
>>
>> Hi Archit,
>>
>> On Monday 26 Sep 2016 12:10:11 Archit Taneja wrote:
>>>
>>> On 9/25/2016 10:58 PM, Laurent Pinchart wrote:
>>>>
>>>> On Friday 23 Sep 2016 14:50:27 Archit Taneja wrote:
>>>>>
>>>>> Add the regulator supply properties needed by ADV7511 and ADV7533. The
>>>>> regulator names are named after the pin names, except for DVDD_3V on
>>>>> ADV7511, which is left v3p3 to have the same name as it's on ADV7533.
>>>>>
>>>>> ADV7511 has a BGVDD pin for which the voltage to be configured isn't
>>>>> clear. This needs to be updated in the document later.
>>>>>
>>>>> The regulators are specified as optional properties since there can
>>>>> be boards which have a fixed supply directly routed to the pins, and
>>>>> these may not be modelled as regulator supplies.
>>>>>
>>>>> Cc: Rob Herring <robh@kernel.org>
>>>>> Cc: devicetree@vger.kernel.org
>>>>> Signed-off-by: Archit Taneja <architt@codeaurora.org>
>>>>> ---
>>>>> v2:
>>>>> - Specify regulator supplies for ADV7511 too.
>>>>> - Have separate supply entries for AVDD, DVDD, PVDD, A2VDD pins.
>>>>> - Add additional BGVDD supply for ADV7511.
>>>>>
>>>>>   .../devicetree/bindings/display/bridge/adi,adv7511.txt     | 14
>>>>> +++++++
>>>>>   1 file changed, 14 insertions(+)
>>>>>
>>>>> diff --git
>>>>> a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>>>>> b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>>>>> index
>>>>> 6532a59..66e6bae 100644
>>>>> --- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>>>>> +++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>>>>>
>>>>> @@ -56,6 +56,20 @@ Optional properties:
>>>>>   - adi,disable-timing-generator: Only for ADV7533. Disables the
>>>>> internal
>>>>>
>>>>> timing generator. The chip will rely on the sync signals in the DSI
>>>>> data
>>>>> lanes, rather than generate its own timings for HDMI output.
>>>>> +- avdd-supply: A 1.8V supply that powers up the AVDD pin on the chip.
>>>>> +- dvdd-supply: A 1.8V supply that powers up the DVDD pin on the chip.
>>>>> +- pvdd-supply: A 1.8V supply that powers up the PVDD pin on the chip.
>>>>> +- v3p3-supply: A 3.3V supply that powers up the pin called DVDD_3V on
>>>>> +  ADV7511 and V3P3 on ADV7533.
>>>>> +
>>>>> +ADV7511 specific supplies:
>>>>> +- bgvdd-supply: Powers the BGVDD pin. The voltage isn't clear from
>>>>> +  available datasheets.
>>>>
>>>>
>>>> It's a 1.8V supply. The ADV7511 hardware user's guide recommends tying
>>>> it
>>>> to the PVDD supply, so I'm not sure we need a separate supply in DT.
>>>
>>>
>>> Thanks for providing the info. I'll update it in the doc.
>>>
>>>> Similarly, the user's guide recommends supplying the AVDD, DVDD and PVDD
>>>> pins with a single 1.8V LDO and three independent filters. We could thus
>>>> possibly combine them into a single 1.8V supply.
>>>
>>>
>>> I'd originally specified only one AVDD supply for all the 1.8 V
>>> supplies, but Rob had recommended using separate supplies for each pin.
>>>
>>> I guess it doesn't do much harm specifying separate supplies, a
>>> board can just provide avdd-supply, and the rest would be assumed dummy.
>>
>>
>> DT should use the same regulator phandle for all power supplies in that
>> case,
>> not specify a single one.
>>
>>> It could also help describe boards which may not have followed the
>>> user guide's recommendation, but I agree that's probably a rare
>>> scenario.
>>>
>>> Is it okay if we stick with multiple supplies as it is in this version?
>>
>>
>> It seems overkill to me but I can live with that. I'd remove the bgvdd
>> supply
>> though.
>>
>> Rob, what's your opinion on this ? Is there a specific reason why you
>> prefer
>> splitting the 1.8V supply in one supply per pin, when the hardware user's
>> guide recommend powering them from the same LDO ?
>
>
> Could you suggest us which way to go?

If they are really intended to be the same supply, then combining them
is fine with me.

Rob

Re: [PATCH v2 1/4] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Archit Taneja]

On 11/10/2016 07:04 AM, Rob Herring wrote:
> On Fri, Oct 14, 2016 at 12:40 AM, Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> wrote:
>> Hi Rob,
>>
>>
>> On 09/26/2016 01:42 PM, Laurent Pinchart wrote:
>>>
>>> Hi Archit,
>>>
>>> On Monday 26 Sep 2016 12:10:11 Archit Taneja wrote:
>>>>
>>>> On 9/25/2016 10:58 PM, Laurent Pinchart wrote:
>>>>>
>>>>> On Friday 23 Sep 2016 14:50:27 Archit Taneja wrote:
>>>>>>
>>>>>> Add the regulator supply properties needed by ADV7511 and ADV7533. The
>>>>>> regulator names are named after the pin names, except for DVDD_3V on
>>>>>> ADV7511, which is left v3p3 to have the same name as it's on ADV7533.
>>>>>>
>>>>>> ADV7511 has a BGVDD pin for which the voltage to be configured isn't
>>>>>> clear. This needs to be updated in the document later.
>>>>>>
>>>>>> The regulators are specified as optional properties since there can
>>>>>> be boards which have a fixed supply directly routed to the pins, and
>>>>>> these may not be modelled as regulator supplies.
>>>>>>
>>>>>> Cc: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
>>>>>> Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
>>>>>> Signed-off-by: Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
>>>>>> ---
>>>>>> v2:
>>>>>> - Specify regulator supplies for ADV7511 too.
>>>>>> - Have separate supply entries for AVDD, DVDD, PVDD, A2VDD pins.
>>>>>> - Add additional BGVDD supply for ADV7511.
>>>>>>
>>>>>>   .../devicetree/bindings/display/bridge/adi,adv7511.txt     | 14
>>>>>> +++++++
>>>>>>   1 file changed, 14 insertions(+)
>>>>>>
>>>>>> diff --git
>>>>>> a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>>>>>> b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>>>>>> index
>>>>>> 6532a59..66e6bae 100644
>>>>>> --- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>>>>>> +++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>>>>>>
>>>>>> @@ -56,6 +56,20 @@ Optional properties:
>>>>>>   - adi,disable-timing-generator: Only for ADV7533. Disables the
>>>>>> internal
>>>>>>
>>>>>> timing generator. The chip will rely on the sync signals in the DSI
>>>>>> data
>>>>>> lanes, rather than generate its own timings for HDMI output.
>>>>>> +- avdd-supply: A 1.8V supply that powers up the AVDD pin on the chip.
>>>>>> +- dvdd-supply: A 1.8V supply that powers up the DVDD pin on the chip.
>>>>>> +- pvdd-supply: A 1.8V supply that powers up the PVDD pin on the chip.
>>>>>> +- v3p3-supply: A 3.3V supply that powers up the pin called DVDD_3V on
>>>>>> +  ADV7511 and V3P3 on ADV7533.
>>>>>> +
>>>>>> +ADV7511 specific supplies:
>>>>>> +- bgvdd-supply: Powers the BGVDD pin. The voltage isn't clear from
>>>>>> +  available datasheets.
>>>>>
>>>>>
>>>>> It's a 1.8V supply. The ADV7511 hardware user's guide recommends tying
>>>>> it
>>>>> to the PVDD supply, so I'm not sure we need a separate supply in DT.
>>>>
>>>>
>>>> Thanks for providing the info. I'll update it in the doc.
>>>>
>>>>> Similarly, the user's guide recommends supplying the AVDD, DVDD and PVDD
>>>>> pins with a single 1.8V LDO and three independent filters. We could thus
>>>>> possibly combine them into a single 1.8V supply.
>>>>
>>>>
>>>> I'd originally specified only one AVDD supply for all the 1.8 V
>>>> supplies, but Rob had recommended using separate supplies for each pin.
>>>>
>>>> I guess it doesn't do much harm specifying separate supplies, a
>>>> board can just provide avdd-supply, and the rest would be assumed dummy.
>>>
>>>
>>> DT should use the same regulator phandle for all power supplies in that
>>> case,
>>> not specify a single one.
>>>
>>>> It could also help describe boards which may not have followed the
>>>> user guide's recommendation, but I agree that's probably a rare
>>>> scenario.
>>>>
>>>> Is it okay if we stick with multiple supplies as it is in this version?
>>>
>>>
>>> It seems overkill to me but I can live with that. I'd remove the bgvdd
>>> supply
>>> though.
>>>
>>> Rob, what's your opinion on this ? Is there a specific reason why you
>>> prefer
>>> splitting the 1.8V supply in one supply per pin, when the hardware user's
>>> guide recommend powering them from the same LDO ?
>>
>>
>> Could you suggest us which way to go?
>
> If they are really intended to be the same supply, then combining them
> is fine with me.

Thanks, I'll change my patchset accordingly.

Archit

>
> Rob
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[PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Archit Taneja]

Add the regulator supply properties needed by ADV7511 and ADV7533.

The regulators are specified as optional properties since there can
be boards which have a fixed supply directly routed to the pins, and
these may not be modelled as regulator supplies.

Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Signed-off-by: Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
v3:
- Revert back to having a common avdd-supply property for the 1.8V
  supplies

 Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
index 6532a59..13d53bc 100644
--- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
+++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
@@ -56,6 +56,15 @@ Optional properties:
 - adi,disable-timing-generator: Only for ADV7533. Disables the internal timing
   generator. The chip will rely on the sync signals in the DSI data lanes,
   rather than generate its own timings for HDMI output.
+- avdd-supply: A common 1.8V supply that powers up the AVDD, DVDD and PVDD
+  pins. On ADV7511, it also feeds to the BGVDD pin. On ADV7533, it also powers
+  up the A2VDD pin.
+- v3p3-supply: A 3.3V supply that powers up the pin called DVDD_3V on
+  ADV7511 and V3P3 on ADV7533.
+
+ADV7533 specific supplies:
+- v1p2-supply: A supply that powers up the V1P2 pin on the chip. It can be
+  either 1.2V or 1.8V.
 
 Required nodes:
 
-- 
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Re: [PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Laurent Pinchart]

Hi Archit,

Thank you for the patch.

On Tuesday 29 Nov 2016 11:37:41 Archit Taneja wrote:
> Add the regulator supply properties needed by ADV7511 and ADV7533.
> 
> The regulators are specified as optional properties since there can
> be boards which have a fixed supply directly routed to the pins, and
> these may not be modelled as regulator supplies.

That's why we have support for dummy supplies in the kernel, isn't it ? Isn't 
it better to make the supplies mandatory in the bindings (and obviously 
handling them as optional in the driver for backward-compatibility) ?

Apart from that,

Acked-by: Laurent Pinchart <laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>

> Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> Signed-off-by: Archit Taneja <architt-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
> ---
> v3:
> - Revert back to having a common avdd-supply property for the 1.8V
>   supplies
> 
> Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt | 9 ++++++
> 1 file changed, 9 insertions(+)
> 
> diff --git
> a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt index
> 6532a59..13d53bc 100644
> --- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> +++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> @@ -56,6 +56,15 @@ Optional properties:
>  - adi,disable-timing-generator: Only for ADV7533. Disables the internal
> timing generator. The chip will rely on the sync signals in the DSI data
> lanes, rather than generate its own timings for HDMI output.
> +- avdd-supply: A common 1.8V supply that powers up the AVDD, DVDD and PVDD
> +  pins. On ADV7511, it also feeds to the BGVDD pin. On ADV7533, it also
> powers
> +  up the A2VDD pin.
> +- v3p3-supply: A 3.3V supply that powers up the pin called DVDD_3V on
> +  ADV7511 and V3P3 on ADV7533.
> +
> +ADV7533 specific supplies:
> +- v1p2-supply: A supply that powers up the V1P2 pin on the chip. It can be
> +  either 1.2V or 1.8V.
> 
>  Required nodes:

-- 
Regards,

Laurent Pinchart

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Re: [PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Archit Taneja]

On 11/29/2016 12:03 PM, Laurent Pinchart wrote:
> Hi Archit,
>
> Thank you for the patch.
>
> On Tuesday 29 Nov 2016 11:37:41 Archit Taneja wrote:
>> Add the regulator supply properties needed by ADV7511 and ADV7533.
>>
>> The regulators are specified as optional properties since there can
>> be boards which have a fixed supply directly routed to the pins, and
>> these may not be modelled as regulator supplies.
>
> That's why we have support for dummy supplies in the kernel, isn't it ? Isn't
> it better to make the supplies mandatory in the bindings (and obviously
> handling them as optional in the driver for backward-compatibility) ?

I'm a bit unclear on this.

I thought we couldn't add mandatory properties once the device is already
present in DT for one or more platforms.

Say, if we do make it mandatory for future additions, we would need to have
DT property for the supplies for the new platforms. If the regulators on
these boards are fixed supplies, they would be need to be modeled
using "regulator-fixed", possibly without any input supply. Is that
what you're suggesting?

Thanks,
Archit

>
> Apart from that,
>
> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
>
>> Cc: devicetree@vger.kernel.org
>> Acked-by: Rob Herring <robh@kernel.org>
>> Signed-off-by: Archit Taneja <architt@codeaurora.org>
>> ---
>> v3:
>> - Revert back to having a common avdd-supply property for the 1.8V
>>   supplies
>>
>> Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt | 9 ++++++
>> 1 file changed, 9 insertions(+)
>>
>> diff --git
>> a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>> b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt index
>> 6532a59..13d53bc 100644
>> --- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>> +++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
>> @@ -56,6 +56,15 @@ Optional properties:
>>  - adi,disable-timing-generator: Only for ADV7533. Disables the internal
>> timing generator. The chip will rely on the sync signals in the DSI data
>> lanes, rather than generate its own timings for HDMI output.
>> +- avdd-supply: A common 1.8V supply that powers up the AVDD, DVDD and PVDD
>> +  pins. On ADV7511, it also feeds to the BGVDD pin. On ADV7533, it also
>> powers
>> +  up the A2VDD pin.
>> +- v3p3-supply: A 3.3V supply that powers up the pin called DVDD_3V on
>> +  ADV7511 and V3P3 on ADV7533.
>> +
>> +ADV7533 specific supplies:
>> +- v1p2-supply: A supply that powers up the V1P2 pin on the chip. It can be
>> +  either 1.2V or 1.8V.
>>
>>  Required nodes:
>

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Re: [PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Laurent Pinchart]

Hi Archit,

(CC'ing Mark Brown)

On Tuesday 29 Nov 2016 13:41:33 Archit Taneja wrote:
> On 11/29/2016 12:03 PM, Laurent Pinchart wrote:
> > On Tuesday 29 Nov 2016 11:37:41 Archit Taneja wrote:
> >> Add the regulator supply properties needed by ADV7511 and ADV7533.
> >> 
> >> The regulators are specified as optional properties since there can
> >> be boards which have a fixed supply directly routed to the pins, and
> >> these may not be modelled as regulator supplies.
> > 
> > That's why we have support for dummy supplies in the kernel, isn't it ?
> > Isn't it better to make the supplies mandatory in the bindings (and
> > obviously handling them as optional in the driver for
> > backward-compatibility) ?
>
> I'm a bit unclear on this.
> 
> I thought we couldn't add mandatory properties once the device is already
> present in DT for one or more platforms.

You can, as long as you treat them as optional in the driver to retain 
backward compatibility. The DT bindings should document the properties 
expected from a new platform (older versions of the bindings will always be 
available in the git history).

> Say, if we do make it mandatory for future additions, we would need to have
> DT property for the supplies for the new platforms. If the regulators on
> these boards are fixed supplies, they would be need to be modeled
> using "regulator-fixed", possibly without any input supply. Is that
> what you're suggesting?

That's the idea, yes. Clock maintainers have a similar opinion regarding the 
clock bindings, where a clock that is not optional at the hardware level 
should be specified in DT even if it's always present.

Mark, any opinion ?

> > Apart from that,
> > 
> > Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > 
> >> Cc: devicetree@vger.kernel.org
> >> Acked-by: Rob Herring <robh@kernel.org>
> >> Signed-off-by: Archit Taneja <architt@codeaurora.org>
> >> ---
> >> v3:
> >> - Revert back to having a common avdd-supply property for the 1.8V
> >>   supplies
> >> 
> >> Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt | 9 ++++
> >> 1 file changed, 9 insertions(+)
> >> 
> >> diff --git
> >> a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> >> b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt index
> >> 6532a59..13d53bc 100644
> >> --- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> >> +++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
> >> 
> >> @@ -56,6 +56,15 @@ Optional properties:
> >>  - adi,disable-timing-generator: Only for ADV7533. Disables the internal
> >> 
> >> timing generator. The chip will rely on the sync signals in the DSI data
> >> lanes, rather than generate its own timings for HDMI output.
> >> +- avdd-supply: A common 1.8V supply that powers up the AVDD, DVDD and
> >> PVDD
> >> +  pins. On ADV7511, it also feeds to the BGVDD pin. On ADV7533, it also
> >> powers
> >> +  up the A2VDD pin.
> >> +- v3p3-supply: A 3.3V supply that powers up the pin called DVDD_3V on
> >> +  ADV7511 and V3P3 on ADV7533.
> >> +
> >> +ADV7533 specific supplies:
> >> +- v1p2-supply: A supply that powers up the V1P2 pin on the chip. It can
> >> be
> >> +  either 1.2V or 1.8V.
> >> 
> >>  Required nodes:

-- 
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Re: [PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Mark Brown]

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On Tue, Nov 29, 2016 at 11:11:03AM +0200, Laurent Pinchart wrote:
> On Tuesday 29 Nov 2016 13:41:33 Archit Taneja wrote:

> > I thought we couldn't add mandatory properties once the device is already
> > present in DT for one or more platforms.

> You can, as long as you treat them as optional in the driver to retain 
> backward compatibility. The DT bindings should document the properties 
> expected from a new platform (older versions of the bindings will always be 
> available in the git history).

The device probably never worked without power...  note that the kernel
will substitute in dummy regulators for anything that isn't explicitly
mapped so it won't actually break anything.

> > Say, if we do make it mandatory for future additions, we would need to have
> > DT property for the supplies for the new platforms. If the regulators on
> > these boards are fixed supplies, they would be need to be modeled
> > using "regulator-fixed", possibly without any input supply. Is that
> > what you're suggesting?

> That's the idea, yes. Clock maintainers have a similar opinion regarding the 
> clock bindings, where a clock that is not optional at the hardware level 
> should be specified in DT even if it's always present.

> Mark, any opinion ?

It's best practice to always describe the power.  The kernel will cope
if people don't but it's not unknown for drivers to discover a reason
for wanting information about their power and hard to retrofit that if
it's not been in there from the get go.

Please note that if you're going to CC me into a graphics thread there's
a good chance I will miss it, I get copied on quite a lot of graphics
related mail that's not really relevant so I often skip it.  Changing
the subject line would help with that.

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Re: [PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Laurent Pinchart]

Hi Mark,

On Tuesday 29 Nov 2016 11:01:25 Mark Brown wrote:
> On Tue, Nov 29, 2016 at 11:11:03AM +0200, Laurent Pinchart wrote:
> > On Tuesday 29 Nov 2016 13:41:33 Archit Taneja wrote:
> >> I thought we couldn't add mandatory properties once the device is
> >> already present in DT for one or more platforms.
> > 
> > You can, as long as you treat them as optional in the driver to retain
> > backward compatibility. The DT bindings should document the properties
> > expected from a new platform (older versions of the bindings will always
> > be available in the git history).
> 
> The device probably never worked without power...  note that the kernel
> will substitute in dummy regulators for anything that isn't explicitly
> mapped so it won't actually break anything.
> 
> >> Say, if we do make it mandatory for future additions, we would need to
> >> have DT property for the supplies for the new platforms. If the
> >> regulators on these boards are fixed supplies, they would be need to be
> >> modeled using "regulator-fixed", possibly without any input supply. Is
> >> that what you're suggesting?
> > 
> > That's the idea, yes. Clock maintainers have a similar opinion regarding
> > the clock bindings, where a clock that is not optional at the hardware
> > level should be specified in DT even if it's always present.
> > 
> > Mark, any opinion ?
> 
> It's best practice to always describe the power.  The kernel will cope
> if people don't but it's not unknown for drivers to discover a reason
> for wanting information about their power and hard to retrofit that if
> it's not been in there from the get go.

Sounds good to me, thanks.

> Please note that if you're going to CC me into a graphics thread there's
> a good chance I will miss it, I get copied on quite a lot of graphics
> related mail that's not really relevant so I often skip it.  Changing
> the subject line would help with that.

I try to add a (CC'ing xxx) at the beginning of the e-mail to draw attention 
when a question is targetted at a particular person. If that's not enough I 
can change the subject, but might forget to do so from time to time. Or you 
could whitelist me, unless I'm already blacklisted ;-)

-- 
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Laurent Pinchart

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Re: [PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Mark Brown]

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On Tue, Nov 29, 2016 at 09:37:31PM +0200, Laurent Pinchart wrote:
> On Tuesday 29 Nov 2016 11:01:25 Mark Brown wrote:

> > Please note that if you're going to CC me into a graphics thread there's
> > a good chance I will miss it, I get copied on quite a lot of graphics
> > related mail that's not really relevant so I often skip it.  Changing
> > the subject line would help with that.

> I try to add a (CC'ing xxx) at the beginning of the e-mail to draw attention 
> when a question is targetted at a particular person. If that's not enough I 
> can change the subject, but might forget to do so from time to time. Or you 
> could whitelist me, unless I'm already blacklisted ;-)

That helps if I open the mail (especially with large e-mails, I do
sometimes get bored looking for something relevant) but I also filter
just on subject lines - once you've been involved with a thread about a
topic people often seem to end up copying you for anything even vaguely
related unfortunately.

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[PATCH v4 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Archit Taneja]

Add the regulator supply properties needed by ADV7511 and ADV7533.

Cc: devicetree@vger.kernel.org
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
---
 Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
index 6532a59..00ce479 100644
--- a/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
+++ b/Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt
@@ -38,10 +38,18 @@ The following input format properties are required except in "rgb 1x" and
 - adi,input-justification: The input bit justification ("left", "evenly",
   "right").
 
+- avdd-supply: A common 1.8V supply that powers up the AVDD, DVDD and PVDD
+  pins. On ADV7511, it also feeds to the BGVDD pin. On ADV7533, it also powers
+  up the A2VDD pin.
+- v3p3-supply: A 3.3V supply that powers up the pin called DVDD_3V on
+  ADV7511 and V3P3 on ADV7533.
+
 The following properties are required for ADV7533:
 
 - adi,dsi-lanes: Number of DSI data lanes connected to the DSI host. It should
   be one of 1, 2, 3 or 4.
+- v1p2-supply: A supply that powers up the V1P2 pin on the chip. It can be
+  either 1.2V or 1.8V. This supply is specific to ADV7533.
 
 Optional properties:
 
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Re: [PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Bjorn Andersson]

On Tue 29 Nov 01:11 PST 2016, Laurent Pinchart wrote:

> Hi Archit,
> 
> (CC'ing Mark Brown)
> 
> On Tuesday 29 Nov 2016 13:41:33 Archit Taneja wrote:
> > On 11/29/2016 12:03 PM, Laurent Pinchart wrote:
> > > On Tuesday 29 Nov 2016 11:37:41 Archit Taneja wrote:
> > >> Add the regulator supply properties needed by ADV7511 and ADV7533.
> > >> 
> > >> The regulators are specified as optional properties since there can
> > >> be boards which have a fixed supply directly routed to the pins, and
> > >> these may not be modelled as regulator supplies.
> > > 
> > > That's why we have support for dummy supplies in the kernel, isn't it ?
> > > Isn't it better to make the supplies mandatory in the bindings (and
> > > obviously handling them as optional in the driver for
> > > backward-compatibility) ?
> >
> > I'm a bit unclear on this.
> > 
> > I thought we couldn't add mandatory properties once the device is already
> > present in DT for one or more platforms.
> 
> You can, as long as you treat them as optional in the driver to retain 
> backward compatibility. The DT bindings should document the properties 
> expected from a new platform (older versions of the bindings will always be 
> available in the git history).

If you document them as required and don't do anything special in the
implementation (i.e. just call devm_regulator_get() as usual) it will
just work, in the absence of the property you will get a dummy regulator
from the framework.

And then add the fixed-voltage regulators to the new DT to make that
properly describe the hardware.

> 
> > Say, if we do make it mandatory for future additions, we would need to have
> > DT property for the supplies for the new platforms. If the regulators on
> > these boards are fixed supplies, they would be need to be modeled
> > using "regulator-fixed", possibly without any input supply. Is that
> > what you're suggesting?
> 
> That's the idea, yes. Clock maintainers have a similar opinion regarding the 
> clock bindings, where a clock that is not optional at the hardware level 
> should be specified in DT even if it's always present.
> 

Further more, a DT binding for a particular block should describe that
block; so if we have three different 1.8V pins then the DT binding
should reflect this - even if our current platform have them wired to
the same regulator.

(And the supply names would preferably be based on the pin names in the
component data sheet)

Regards,
Bjorn

Re: [PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Laurent Pinchart]

Hi Bjorn,

On Monday 05 Dec 2016 13:11:51 Bjorn Andersson wrote:
> On Tue 29 Nov 01:11 PST 2016, Laurent Pinchart wrote:
> > On Tuesday 29 Nov 2016 13:41:33 Archit Taneja wrote:
> >> On 11/29/2016 12:03 PM, Laurent Pinchart wrote:
> >>> On Tuesday 29 Nov 2016 11:37:41 Archit Taneja wrote:
> >>>> Add the regulator supply properties needed by ADV7511 and ADV7533.
> >>>> 
> >>>> The regulators are specified as optional properties since there can
> >>>> be boards which have a fixed supply directly routed to the pins, and
> >>>> these may not be modelled as regulator supplies.
> >>> 
> >>> That's why we have support for dummy supplies in the kernel, isn't it
> >>> ? Isn't it better to make the supplies mandatory in the bindings (and
> >>> obviously handling them as optional in the driver for
> >>> backward-compatibility) ?
> >> 
> >> I'm a bit unclear on this.
> >> 
> >> I thought we couldn't add mandatory properties once the device is
> >> already present in DT for one or more platforms.
> > 
> > You can, as long as you treat them as optional in the driver to retain
> > backward compatibility. The DT bindings should document the properties
> > expected from a new platform (older versions of the bindings will always
> > be available in the git history).
> 
> If you document them as required and don't do anything special in the
> implementation (i.e. just call devm_regulator_get() as usual) it will
> just work, in the absence of the property you will get a dummy regulator
> from the framework.
> 
> And then add the fixed-voltage regulators to the new DT to make that
> properly describe the hardware.
> 
> >> Say, if we do make it mandatory for future additions, we would need to
> >> have DT property for the supplies for the new platforms. If the
> >> regulators on these boards are fixed supplies, they would be need to be
> >> modeled using "regulator-fixed", possibly without any input supply. Is
> >> that what you're suggesting?
> > 
> > That's the idea, yes. Clock maintainers have a similar opinion regarding
> > the clock bindings, where a clock that is not optional at the hardware
> > level should be specified in DT even if it's always present.
> 
> Further more, a DT binding for a particular block should describe that
> block; so if we have three different 1.8V pins then the DT binding
> should reflect this - even if our current platform have them wired to
> the same regulator.

This has been discussed previously, and Rob agreed that if the datasheet 
recommends to power all supplies from the same regulator we can take that as a 
good hint that a single supply should be enough. In the very unlikely event 
that a board would require control of more regulators we can always extend the 
DT bindings later without breaking backward compatibility.

> (And the supply names would preferably be based on the pin names in the
> component data sheet)

-- 
Regards,

Laurent Pinchart

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Re: [PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Mark Brown]

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On Mon, Dec 05, 2016 at 11:16:22PM +0200, Laurent Pinchart wrote:
> On Monday 05 Dec 2016 13:11:51 Bjorn Andersson wrote:

> > Further more, a DT binding for a particular block should describe that
> > block; so if we have three different 1.8V pins then the DT binding
> > should reflect this - even if our current platform have them wired to
> > the same regulator.

> This has been discussed previously, and Rob agreed that if the datasheet 
> recommends to power all supplies from the same regulator we can take that as a 
> good hint that a single supply should be enough. In the very unlikely event 
> that a board would require control of more regulators we can always extend the 
> DT bindings later without breaking backward compatibility.

No, don't do this - introducing special snowflake bindings just makes
things more complex at the system level and tells everyone else that
they too can have special snowflake bindings.  Someone should be able to
connect up the regulators based purely on a schematic.  Just describe
the hardware, it's just one extra line in the DT per regulator.

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Re: [PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Laurent Pinchart]

Hi Mark,

On Tuesday 06 Dec 2016 10:05:17 Mark Brown wrote:
> On Mon, Dec 05, 2016 at 11:16:22PM +0200, Laurent Pinchart wrote:
> > On Monday 05 Dec 2016 13:11:51 Bjorn Andersson wrote:
> >> Further more, a DT binding for a particular block should describe that
> >> block; so if we have three different 1.8V pins then the DT binding
> >> should reflect this - even if our current platform have them wired to
> >> the same regulator.
> > 
> > This has been discussed previously, and Rob agreed that if the datasheet
> > recommends to power all supplies from the same regulator we can take that
> > as a good hint that a single supply should be enough. In the very
> > unlikely event that a board would require control of more regulators we
> > can always extend the DT bindings later without breaking backward
> > compatibility.
> 
> No, don't do this - introducing special snowflake bindings just makes
> things more complex at the system level and tells everyone else that
> they too can have special snowflake bindings.  Someone should be able to
> connect up the regulators based purely on a schematic.  Just describe
> the hardware, it's just one extra line in the DT per regulator.

There are power supply pin that have different names but documented as having 
to be connected to the same supply. I really see no point in having multiple 
regulators for them.

-- 
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Laurent Pinchart

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Re: [PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Mark Brown]

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On Tue, Dec 06, 2016 at 02:46:55PM +0200, Laurent Pinchart wrote:
> On Tuesday 06 Dec 2016 10:05:17 Mark Brown wrote:
> > On Mon, Dec 05, 2016 at 11:16:22PM +0200, Laurent Pinchart wrote:

> > > This has been discussed previously, and Rob agreed that if the datasheet
> > > recommends to power all supplies from the same regulator we can take that
> > > as a good hint that a single supply should be enough. In the very

> > No, don't do this - introducing special snowflake bindings just makes
> > things more complex at the system level and tells everyone else that
> > they too can have special snowflake bindings.  Someone should be able to
> > connect up the regulators based purely on a schematic.  Just describe
> > the hardware, it's just one extra line in the DT per regulator.

> There are power supply pin that have different names but documented as having 
> to be connected to the same supply. I really see no point in having multiple 
> regulators for them.

The tiny amount of extra typing involved doesn't seem like much of a
cost for keeping things consistent with every other regulator user out
there.

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Re: [PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Laurent Pinchart]

Hi Mark,

On Tuesday 06 Dec 2016 13:20:20 Mark Brown wrote:
> On Tue, Dec 06, 2016 at 02:46:55PM +0200, Laurent Pinchart wrote:
> > On Tuesday 06 Dec 2016 10:05:17 Mark Brown wrote:
> > > On Mon, Dec 05, 2016 at 11:16:22PM +0200, Laurent Pinchart wrote:
> > > > This has been discussed previously, and Rob agreed that if the
> > > > datasheet recommends to power all supplies from the same regulator we
> > > > can take that as a good hint that a single supply should be enough. In
> > > > the very
> > > 
> > > No, don't do this - introducing special snowflake bindings just makes
> > > things more complex at the system level and tells everyone else that
> > > they too can have special snowflake bindings.  Someone should be able to
> > > connect up the regulators based purely on a schematic.  Just describe
> > > the hardware, it's just one extra line in the DT per regulator.
> > 
> > There are power supply pin that have different names but documented as
> > having to be connected to the same supply. I really see no point in
> > having multiple regulators for them.
> 
> The tiny amount of extra typing involved doesn't seem like much of a
> cost for keeping things consistent with every other regulator user out
> there.

I'm not concerned by that at all, but by the additional runtime complexity :-/

-- 
Regards,

Laurent Pinchart

Re: [PATCH v3 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Mark Brown]

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On Tue, Dec 06, 2016 at 06:08:55PM +0200, Laurent Pinchart wrote:
> On Tuesday 06 Dec 2016 13:20:20 Mark Brown wrote:

> > The tiny amount of extra typing involved doesn't seem like much of a
> > cost for keeping things consistent with every other regulator user out
> > there.

> I'm not concerned by that at all, but by the additional runtime complexity :-/

regulator_bulk_()! :)

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Re: [PATCH v4 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Rob Herring]

On Mon, Dec 05, 2016 at 01:23:54PM +0530, Archit Taneja wrote:
> Add the regulator supply properties needed by ADV7511 and ADV7533.
> 
> Cc: devicetree@vger.kernel.org
> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Archit Taneja <architt@codeaurora.org>
> ---
>  Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt | 8 ++++++++
>  1 file changed, 8 insertions(+)

Didn't I ack this already? Anyway,

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v4 1/2] dt-bindings: drm/bridge: adv7511: Add regulator bindings

[Archit Taneja]

On 12/10/2016 3:41 AM, Rob Herring wrote:
> On Mon, Dec 05, 2016 at 01:23:54PM +0530, Archit Taneja wrote:
>> Add the regulator supply properties needed by ADV7511 and ADV7533.
>>
>> Cc: devicetree@vger.kernel.org
>> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
>> Signed-off-by: Archit Taneja <architt@codeaurora.org>
>> ---
>>  Documentation/devicetree/bindings/display/bridge/adi,adv7511.txt | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>
> Didn't I ack this already? Anyway,

You had Acked it before. This set moved the regulator bindings from
optional to mandatory, so I thought it may need you review again.

Mark Brown insisted that we have a regulator supply per pin even if
the chip's specs recommend using a common supply for them, so I'm
going to bring that back again. I'll keep your Ack for the next
revision since that's something you'd originally recommended.

Thanks,
Archit

>
> Acked-by: Rob Herring <robh@kernel.org>
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