[PATCH 7/9] dt-bindings: media/s5p-cec.txt: document needs-hpd property

[PATCH 7/9] dt-bindings: media/s5p-cec.txt: document needs-hpd property

[Hans Verkuil]

From: Hans Verkuil <hans.verkuil@cisco.com>

Needed for boards that wire the CEC pin in such a way that it
is unavailable when the HPD is low.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: devicetree@vger.kernel.org
---
 Documentation/devicetree/bindings/media/s5p-cec.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/s5p-cec.txt b/Documentation/devicetree/bindings/media/s5p-cec.txt
index 4bb08d9d940b..261af4d1a791 100644
--- a/Documentation/devicetree/bindings/media/s5p-cec.txt
+++ b/Documentation/devicetree/bindings/media/s5p-cec.txt
@@ -17,6 +17,12 @@ Required properties:
   - samsung,syscon-phandle - phandle to the PMU system controller
   - hdmi-phandle - phandle to the HDMI controller
 
+Optional:
+  - needs-hpd : if present the CEC support is only available when the HPD
+    is high. Some boards only let the CEC pin through if the HPD is high, for
+    example if there is a level converter that uses the HPD to power up
+    or down.
+
 Example:
 
 hdmicec: cec@100B0000 {
-- 
2.11.0

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Re: [PATCH 7/9] dt-bindings: media/s5p-cec.txt: document needs-hpd property

[Rob Herring]

On Wed, Jun 07, 2017 at 04:46:14PM +0200, Hans Verkuil wrote:
> From: Hans Verkuil <hans.verkuil@cisco.com>
> 
> Needed for boards that wire the CEC pin in such a way that it
> is unavailable when the HPD is low.
> 
> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
> Cc: Krzysztof Kozlowski <krzk@kernel.org>
> Cc: Andrzej Hajda <a.hajda@samsung.com>
> Cc: devicetree@vger.kernel.org
> ---
>  Documentation/devicetree/bindings/media/s5p-cec.txt | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/s5p-cec.txt b/Documentation/devicetree/bindings/media/s5p-cec.txt
> index 4bb08d9d940b..261af4d1a791 100644
> --- a/Documentation/devicetree/bindings/media/s5p-cec.txt
> +++ b/Documentation/devicetree/bindings/media/s5p-cec.txt
> @@ -17,6 +17,12 @@ Required properties:
>    - samsung,syscon-phandle - phandle to the PMU system controller
>    - hdmi-phandle - phandle to the HDMI controller
>  
> +Optional:
> +  - needs-hpd : if present the CEC support is only available when the HPD
> +    is high. Some boards only let the CEC pin through if the HPD is high, for
> +    example if there is a level converter that uses the HPD to power up
> +    or down.

Seems like something common. Can you document in a common location?

> +
>  Example:
>  
>  hdmicec: cec@100B0000 {
> -- 
> 2.11.0
> 
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Re: [PATCH 7/9] dt-bindings: media/s5p-cec.txt: document needs-hpd property

[Hans Verkuil]

On 09/06/17 16:07, Rob Herring wrote:
> On Wed, Jun 07, 2017 at 04:46:14PM +0200, Hans Verkuil wrote:
>> From: Hans Verkuil <hans.verkuil@cisco.com>
>>
>> Needed for boards that wire the CEC pin in such a way that it
>> is unavailable when the HPD is low.
>>
>> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
>> Cc: Krzysztof Kozlowski <krzk@kernel.org>
>> Cc: Andrzej Hajda <a.hajda@samsung.com>
>> Cc: devicetree@vger.kernel.org
>> ---
>>  Documentation/devicetree/bindings/media/s5p-cec.txt | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/media/s5p-cec.txt b/Documentation/devicetree/bindings/media/s5p-cec.txt
>> index 4bb08d9d940b..261af4d1a791 100644
>> --- a/Documentation/devicetree/bindings/media/s5p-cec.txt
>> +++ b/Documentation/devicetree/bindings/media/s5p-cec.txt
>> @@ -17,6 +17,12 @@ Required properties:
>>    - samsung,syscon-phandle - phandle to the PMU system controller
>>    - hdmi-phandle - phandle to the HDMI controller
>>  
>> +Optional:
>> +  - needs-hpd : if present the CEC support is only available when the HPD
>> +    is high. Some boards only let the CEC pin through if the HPD is high, for
>> +    example if there is a level converter that uses the HPD to power up
>> +    or down.
> 
> Seems like something common. Can you document in a common location?

Should we do the same with hdmi-phandle? It is also used by CEC drivers to find
the HDMI driver.

Currently only used by s5p-cec and stih-cec, but there will be more.

I guess this would be a sensible place to document this:

Documentation/devicetree/bindings/media/cec.txt

Regards,

	Hans

> 
>> +
>>  Example:
>>  
>>  hdmicec: cec@100B0000 {
>> -- 
>> 2.11.0
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel

Re: [PATCH 7/9] dt-bindings: media/s5p-cec.txt: document needs-hpd property

[Rob Herring]

On Fri, Jun 9, 2017 at 9:11 AM, Hans Verkuil <hverkuil@xs4all.nl> wrote:
> On 09/06/17 16:07, Rob Herring wrote:
>> On Wed, Jun 07, 2017 at 04:46:14PM +0200, Hans Verkuil wrote:
>>> From: Hans Verkuil <hans.verkuil@cisco.com>
>>>
>>> Needed for boards that wire the CEC pin in such a way that it
>>> is unavailable when the HPD is low.
>>>
>>> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
>>> Cc: Krzysztof Kozlowski <krzk@kernel.org>
>>> Cc: Andrzej Hajda <a.hajda@samsung.com>
>>> Cc: devicetree@vger.kernel.org
>>> ---
>>>  Documentation/devicetree/bindings/media/s5p-cec.txt | 6 ++++++
>>>  1 file changed, 6 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/media/s5p-cec.txt b/Documentation/devicetree/bindings/media/s5p-cec.txt
>>> index 4bb08d9d940b..261af4d1a791 100644
>>> --- a/Documentation/devicetree/bindings/media/s5p-cec.txt
>>> +++ b/Documentation/devicetree/bindings/media/s5p-cec.txt
>>> @@ -17,6 +17,12 @@ Required properties:
>>>    - samsung,syscon-phandle - phandle to the PMU system controller
>>>    - hdmi-phandle - phandle to the HDMI controller
>>>
>>> +Optional:
>>> +  - needs-hpd : if present the CEC support is only available when the HPD
>>> +    is high. Some boards only let the CEC pin through if the HPD is high, for
>>> +    example if there is a level converter that uses the HPD to power up
>>> +    or down.
>>
>> Seems like something common. Can you document in a common location?
>
> Should we do the same with hdmi-phandle? It is also used by CEC drivers to find
> the HDMI driver.

Yes.

> Currently only used by s5p-cec and stih-cec, but there will be more.
>
> I guess this would be a sensible place to document this:
>
> Documentation/devicetree/bindings/media/cec.txt

Sounds good. You can do this as a follow-up to this patch if you want.
For this one:

Acked-by: Rob Herring <robh@kernel.org>
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Re: [PATCH 7/9] dt-bindings: media/s5p-cec.txt: document needs-hpd property

[Hans Verkuil]

On 06/09/2017 05:31 PM, Rob Herring wrote:
> On Fri, Jun 9, 2017 at 9:11 AM, Hans Verkuil <hverkuil@xs4all.nl> wrote:
>> On 09/06/17 16:07, Rob Herring wrote:
>>> On Wed, Jun 07, 2017 at 04:46:14PM +0200, Hans Verkuil wrote:
>>>> From: Hans Verkuil <hans.verkuil@cisco.com>
>>>>
>>>> Needed for boards that wire the CEC pin in such a way that it
>>>> is unavailable when the HPD is low.
>>>>
>>>> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
>>>> Cc: Krzysztof Kozlowski <krzk@kernel.org>
>>>> Cc: Andrzej Hajda <a.hajda@samsung.com>
>>>> Cc: devicetree@vger.kernel.org
>>>> ---
>>>>  Documentation/devicetree/bindings/media/s5p-cec.txt | 6 ++++++
>>>>  1 file changed, 6 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/media/s5p-cec.txt b/Documentation/devicetree/bindings/media/s5p-cec.txt
>>>> index 4bb08d9d940b..261af4d1a791 100644
>>>> --- a/Documentation/devicetree/bindings/media/s5p-cec.txt
>>>> +++ b/Documentation/devicetree/bindings/media/s5p-cec.txt
>>>> @@ -17,6 +17,12 @@ Required properties:
>>>>    - samsung,syscon-phandle - phandle to the PMU system controller
>>>>    - hdmi-phandle - phandle to the HDMI controller
>>>>
>>>> +Optional:
>>>> +  - needs-hpd : if present the CEC support is only available when the HPD
>>>> +    is high. Some boards only let the CEC pin through if the HPD is high, for
>>>> +    example if there is a level converter that uses the HPD to power up
>>>> +    or down.
>>>
>>> Seems like something common. Can you document in a common location?
>>
>> Should we do the same with hdmi-phandle? It is also used by CEC drivers to find
>> the HDMI driver.
> 
> Yes.
> 
>> Currently only used by s5p-cec and stih-cec, but there will be more.
>>
>> I guess this would be a sensible place to document this:
>>
>> Documentation/devicetree/bindings/media/cec.txt
> 
> Sounds good. You can do this as a follow-up to this patch if you want.
> For this one:
> 
> Acked-by: Rob Herring <robh@kernel.org>
> 

Sorry, I have what might be a stupid question: should I update the s5p-cec.txt
to refer to the cec.txt bindings file for the hdmi-phandle and needs-hpd instead
of describing it here? It seems pointless to do that for the hdmi-phandle, but
it might make more sense for the needs-hpd property.

E.g.:

  - needs-hpd: CEC support is only present if HPD is high. See cec.txt for more
    details.


Proposed text for cec.txt:

-------------------------------------------------
Common bindings for HDMI CEC adapters

- hdmi-phandle: phandle to the HDMI controller.

- needs-hpd: if present the CEC support is only available when the HPD
  is high. Some boards only let the CEC pin through if the HPD is high, for
  example if there is a level converter that uses the HPD to power up
  or down.
-------------------------------------------------

Regards,

	Hans

Re: [PATCH 7/9] dt-bindings: media/s5p-cec.txt: document needs-hpd property

[Rob Herring]

On Fri, Jun 9, 2017 at 10:55 AM, Hans Verkuil <hansverk-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org> wrote:
> On 06/09/2017 05:31 PM, Rob Herring wrote:
>> On Fri, Jun 9, 2017 at 9:11 AM, Hans Verkuil <hverkuil-qWit8jRvyhVmR6Xm/wNWPw@public.gmane.org> wrote:
>>> On 09/06/17 16:07, Rob Herring wrote:
>>>> On Wed, Jun 07, 2017 at 04:46:14PM +0200, Hans Verkuil wrote:
>>>>> From: Hans Verkuil <hans.verkuil-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
>>>>>
>>>>> Needed for boards that wire the CEC pin in such a way that it
>>>>> is unavailable when the HPD is low.
>>>>>
>>>>> Signed-off-by: Hans Verkuil <hans.verkuil-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
>>>>> Cc: Krzysztof Kozlowski <krzk-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
>>>>> Cc: Andrzej Hajda <a.hajda-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
>>>>> Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
>>>>> ---
>>>>>  Documentation/devicetree/bindings/media/s5p-cec.txt | 6 ++++++
>>>>>  1 file changed, 6 insertions(+)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/media/s5p-cec.txt b/Documentation/devicetree/bindings/media/s5p-cec.txt
>>>>> index 4bb08d9d940b..261af4d1a791 100644
>>>>> --- a/Documentation/devicetree/bindings/media/s5p-cec.txt
>>>>> +++ b/Documentation/devicetree/bindings/media/s5p-cec.txt
>>>>> @@ -17,6 +17,12 @@ Required properties:
>>>>>    - samsung,syscon-phandle - phandle to the PMU system controller
>>>>>    - hdmi-phandle - phandle to the HDMI controller
>>>>>
>>>>> +Optional:
>>>>> +  - needs-hpd : if present the CEC support is only available when the HPD
>>>>> +    is high. Some boards only let the CEC pin through if the HPD is high, for
>>>>> +    example if there is a level converter that uses the HPD to power up
>>>>> +    or down.
>>>>
>>>> Seems like something common. Can you document in a common location?
>>>
>>> Should we do the same with hdmi-phandle? It is also used by CEC drivers to find
>>> the HDMI driver.
>>
>> Yes.
>>
>>> Currently only used by s5p-cec and stih-cec, but there will be more.
>>>
>>> I guess this would be a sensible place to document this:
>>>
>>> Documentation/devicetree/bindings/media/cec.txt
>>
>> Sounds good. You can do this as a follow-up to this patch if you want.
>> For this one:
>>
>> Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
>>
>
> Sorry, I have what might be a stupid question: should I update the s5p-cec.txt
> to refer to the cec.txt bindings file for the hdmi-phandle and needs-hpd instead
> of describing it here? It seems pointless to do that for the hdmi-phandle, but
> it might make more sense for the needs-hpd property.

Yes. Just make both say "see ./cec.txt". You're right it doesn't gain
much for hdmi-phandle, but at least indicates it is a standard
property.

Rob
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[PATCH 8/9] s5p_cec: set the CEC_CAP_NEEDS_HPD flag if needed

[Hans Verkuil]

From: Hans Verkuil <hans.verkuil@cisco.com>

Use the needs-hpd DT property to determine if the CEC_CAP_NEEDS_HPD
should be set.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: devicetree@vger.kernel.org
---
 drivers/media/platform/s5p-cec/s5p_cec.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/s5p-cec/s5p_cec.c b/drivers/media/platform/s5p-cec/s5p_cec.c
index 65a223e578ed..8e06071a7977 100644
--- a/drivers/media/platform/s5p-cec/s5p_cec.c
+++ b/drivers/media/platform/s5p-cec/s5p_cec.c
@@ -173,6 +173,7 @@ static int s5p_cec_probe(struct platform_device *pdev)
 	struct platform_device *hdmi_dev;
 	struct resource *res;
 	struct s5p_cec_dev *cec;
+	bool needs_hpd = of_property_read_bool(pdev->dev.of_node, "needs-hpd");
 	int ret;
 
 	np = of_parse_phandle(pdev->dev.of_node, "hdmi-phandle", 0);
@@ -221,7 +222,8 @@ static int s5p_cec_probe(struct platform_device *pdev)
 	cec->adap = cec_allocate_adapter(&s5p_cec_adap_ops, cec,
 		CEC_NAME,
 		CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT |
-		CEC_CAP_PASSTHROUGH | CEC_CAP_RC, 1);
+		CEC_CAP_PASSTHROUGH | CEC_CAP_RC |
+		(needs_hpd ? CEC_CAP_NEEDS_HPD : 0), 1);
 	ret = PTR_ERR_OR_ZERO(cec->adap);
 	if (ret)
 		return ret;
-- 
2.11.0

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Re: [PATCH 8/9] s5p_cec: set the CEC_CAP_NEEDS_HPD flag if needed

[Sylwester Nawrocki]

On 06/07/2017 04:46 PM, Hans Verkuil wrote:
> From: Hans Verkuil <hans.verkuil-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
> 
> Use the needs-hpd DT property to determine if the CEC_CAP_NEEDS_HPD
> should be set.
> 
> Signed-off-by: Hans Verkuil <hans.verkuil-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>

Acked-by: Sylwester Nawrocki <s.nawrocki-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>

> ---
>   drivers/media/platform/s5p-cec/s5p_cec.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/s5p-cec/s5p_cec.c b/drivers/media/platform/s5p-cec/s5p_cec.c
> index 65a223e578ed..8e06071a7977 100644
> --- a/drivers/media/platform/s5p-cec/s5p_cec.c
> +++ b/drivers/media/platform/s5p-cec/s5p_cec.c
> @@ -173,6 +173,7 @@ static int s5p_cec_probe(struct platform_device *pdev)
>   	struct platform_device *hdmi_dev;
>   	struct resource *res;
>   	struct s5p_cec_dev *cec;
> +	bool needs_hpd = of_property_read_bool(pdev->dev.of_node, "needs-hpd");

dev->of_node could also be used instead of pdev->dev.of_node.

>   	int ret;
>   
>   	np = of_parse_phandle(pdev->dev.of_node, "hdmi-phandle", 0);
> @@ -221,7 +222,8 @@ static int s5p_cec_probe(struct platform_device *pdev)
>   	cec->adap = cec_allocate_adapter(&s5p_cec_adap_ops, cec,
>   		CEC_NAME,
>   		CEC_CAP_LOG_ADDRS | CEC_CAP_TRANSMIT |
> -		CEC_CAP_PASSTHROUGH | CEC_CAP_RC, 1);
> +		CEC_CAP_PASSTHROUGH | CEC_CAP_RC |
> +		(needs_hpd ? CEC_CAP_NEEDS_HPD : 0), 1);
>   	ret = PTR_ERR_OR_ZERO(cec->adap);
>   	if (ret)
>   		return ret; 

-- 
Regards,
Sylwester
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[PATCH 9/9] ARM: dts: exynos: add needs-hpd to &hdmicec for Odroid-U3

[Hans Verkuil]

From: Hans Verkuil <hans.verkuil@cisco.com>

The Odroid-U3 board has an IP4791CZ12 level shifter that is
disabled if the HPD is low, which means that the CEC pin is
disabled as well.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: devicetree@vger.kernel.org
---
 arch/arm/boot/dts/exynos4412-odroidu3.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/exynos4412-odroidu3.dts b/arch/arm/boot/dts/exynos4412-odroidu3.dts
index 7504a5aa538e..7209cb48fc2a 100644
--- a/arch/arm/boot/dts/exynos4412-odroidu3.dts
+++ b/arch/arm/boot/dts/exynos4412-odroidu3.dts
@@ -131,3 +131,7 @@
 	cs-gpios = <&gpb 5 GPIO_ACTIVE_HIGH>;
 	status = "okay";
 };
+
+&hdmicec {
+	needs-hpd;
+};
-- 
2.11.0

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Re: [PATCH 9/9] ARM: dts: exynos: add needs-hpd to &hdmicec for Odroid-U3

[Krzysztof Kozlowski]

On Wed, Jun 07, 2017 at 04:46:16PM +0200, Hans Verkuil wrote:
> From: Hans Verkuil <hans.verkuil@cisco.com>
> 
> The Odroid-U3 board has an IP4791CZ12 level shifter that is
> disabled if the HPD is low, which means that the CEC pin is
> disabled as well.
> 
> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
> Cc: Krzysztof Kozlowski <krzk@kernel.org>
> Cc: Andrzej Hajda <a.hajda@samsung.com>
> Cc: devicetree@vger.kernel.org
> ---
>  arch/arm/boot/dts/exynos4412-odroidu3.dts | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/exynos4412-odroidu3.dts b/arch/arm/boot/dts/exynos4412-odroidu3.dts
> index 7504a5aa538e..7209cb48fc2a 100644
> --- a/arch/arm/boot/dts/exynos4412-odroidu3.dts
> +++ b/arch/arm/boot/dts/exynos4412-odroidu3.dts
> @@ -131,3 +131,7 @@
>  	cs-gpios = <&gpb 5 GPIO_ACTIVE_HIGH>;
>  	status = "okay";
>  };
> +
> +&hdmicec {
> +	needs-hpd;
> +};

All good, except we try to keep them sorted alphabetically (helps
avoiding conflicts and makes things easier to find)... which for this
particular file will be difficult as it is semi-sorted. :)
Anyway, how about putting this new node after &buck?

Best regards,
Krzysztof

Re: [PATCH 9/9] ARM: dts: exynos: add needs-hpd to &hdmicec for Odroid-U3

[Hans Verkuil]

On 07/06/17 20:36, Krzysztof Kozlowski wrote:
> On Wed, Jun 07, 2017 at 04:46:16PM +0200, Hans Verkuil wrote:
>> From: Hans Verkuil <hans.verkuil-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
>>
>> The Odroid-U3 board has an IP4791CZ12 level shifter that is
>> disabled if the HPD is low, which means that the CEC pin is
>> disabled as well.
>>
>> Signed-off-by: Hans Verkuil <hans.verkuil-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
>> Cc: Krzysztof Kozlowski <krzk-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
>> Cc: Andrzej Hajda <a.hajda-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org>
>> Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
>> ---
>>  arch/arm/boot/dts/exynos4412-odroidu3.dts | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/exynos4412-odroidu3.dts b/arch/arm/boot/dts/exynos4412-odroidu3.dts
>> index 7504a5aa538e..7209cb48fc2a 100644
>> --- a/arch/arm/boot/dts/exynos4412-odroidu3.dts
>> +++ b/arch/arm/boot/dts/exynos4412-odroidu3.dts
>> @@ -131,3 +131,7 @@
>>  	cs-gpios = <&gpb 5 GPIO_ACTIVE_HIGH>;
>>  	status = "okay";
>>  };
>> +
>> +&hdmicec {
>> +	needs-hpd;
>> +};
> 
> All good, except we try to keep them sorted alphabetically (helps
> avoiding conflicts and makes things easier to find)... which for this
> particular file will be difficult as it is semi-sorted. :)
> Anyway, how about putting this new node after &buck?

Done!

	Hans

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