From: Philippe CORNU <philippe.cornu@st.com> To: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Mark Rutland <mark.rutland@arm.com>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>, Alexandre TORGUE <alexandre.torgue@st.com>, David Airlie <airlied@linux.ie>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>, Yannick FERTRE <yannick.fertre@st.com>, Rob Herring <robh+dt@kernel.org> Subject: Re: [PATCH 1/2] dt-bindings/display/bridge: sii902x: add optional power supplies Date: Thu, 19 Apr 2018 12:41:20 +0000 [thread overview] Message-ID: <a10d41bc-c766-568b-a9cb-d1f0f03390a8@st.com> (raw) In-Reply-To: <1733412.i2Wslp7VkI@avalon> Hi Laurent, On 04/19/2018 01:09 PM, Laurent Pinchart wrote: > Hi Philippe, > > On Thursday, 19 April 2018 12:31:15 EEST Philippe CORNU wrote: >> On 04/19/2018 10:11 AM, Laurent Pinchart wrote: >>> On Tuesday, 10 April 2018 08:19:26 EEST Philippe Cornu wrote: >>> >>>> Add the 3 optional power supplies using the exact description >>>> found in the document named >>>> "SiI9022A/SiI9024A HDMI Transmitter Data Sheet (August 2016)". >>>> >>>> Signed-off-by: Philippe Cornu <philippe.cornu@st.com> >>>> --- >>>> >>>> Documentation/devicetree/bindings/display/bridge/sii902x.txt | 3 +++ >>>> 1 file changed, 3 insertions(+) >>>> >>>> diff --git >>>> a/Documentation/devicetree/bindings/display/bridge/sii902x.txt >>>> b/Documentation/devicetree/bindings/display/bridge/sii902x.txt index >>>> 56a3e68ccb80..cf53678fe574 100644 >>>> --- a/Documentation/devicetree/bindings/display/bridge/sii902x.txt >>>> +++ b/Documentation/devicetree/bindings/display/bridge/sii902x.txt >>>> @@ -8,6 +8,9 @@ Optional properties: >>>> - interrupts-extended or interrupt-parent + interrupts: describe >>>> the interrupt line used to inform the host about hotplug events. >>>> - reset-gpios: OF device-tree gpio specification for RST_N pin. >>>> + - iovcc-supply: I/O supply voltage (1.8V or 3.3V, host-dependent). >>>> + - avcc12-supply: TMDS analog supply voltage (1.2V). >>>> + - cvcc12-supply: Digital core supply voltage (1.2V). >>> >>> It seems that the AVCC12 and CVCC12 power supplies are usually derived >>> from the same source. How about starting with one DT property for both, >>> and adding a second one later if needed ? >> >> Well, I do not know what is the best. Here I took the description from >> the documentation, and to allow all possible board configurations, I >> added these supplies as "optional" properties: if there is only one 1v2 >> regulator on the board, the dt will contain only avcc12 or cvcc12 and >> everything will work fine (we will have a dummy regulator for the >> missing optional 1v2 reg), if both regulators are there for any reasons >> (stability, noise, whatever...) then both entries will be in the dt. >> >> If you confirm you prefer a single 1v2 supply (named for instance >> "vcc12-supply") then I will do :-) > > Please see https://lists.freedesktop.org/archives/dri-devel/2018-April/ > 172400.html (and the messages that lead to it) and https:// > lists.freedesktop.org/archives/dri-devel/2018-March/170763.html. > Thanks for this discussion thread. On my side, I found "CVCC12 and AVCC12 can be derived from the same power source" written with a small font (august 2016 datasheet p13) so then your advice is clearly what we have to do :-) I will add this info in v2 too. Thank you, Philippe :-) >>>> Optional subnodes: >>>> - video input: this subnode can contain a video input port node >
WARNING: multiple messages have this Message-ID (diff)
From: Philippe CORNU <philippe.cornu@st.com> To: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Mark Rutland <mark.rutland@arm.com>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>, Alexandre TORGUE <alexandre.torgue@st.com>, David Airlie <airlied@linux.ie>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>, Yannick FERTRE <yannick.fertre@st.com>, Rob Herring <robh+dt@kernel.org> Subject: Re: [PATCH 1/2] dt-bindings/display/bridge: sii902x: add optional power supplies Date: Thu, 19 Apr 2018 12:41:20 +0000 [thread overview] Message-ID: <a10d41bc-c766-568b-a9cb-d1f0f03390a8@st.com> (raw) In-Reply-To: <1733412.i2Wslp7VkI@avalon> Hi Laurent, On 04/19/2018 01:09 PM, Laurent Pinchart wrote: > Hi Philippe, > > On Thursday, 19 April 2018 12:31:15 EEST Philippe CORNU wrote: >> On 04/19/2018 10:11 AM, Laurent Pinchart wrote: >>> On Tuesday, 10 April 2018 08:19:26 EEST Philippe Cornu wrote: >>> >>>> Add the 3 optional power supplies using the exact description >>>> found in the document named >>>> "SiI9022A/SiI9024A HDMI Transmitter Data Sheet (August 2016)". >>>> >>>> Signed-off-by: Philippe Cornu <philippe.cornu@st.com> >>>> --- >>>> >>>> Documentation/devicetree/bindings/display/bridge/sii902x.txt | 3 +++ >>>> 1 file changed, 3 insertions(+) >>>> >>>> diff --git >>>> a/Documentation/devicetree/bindings/display/bridge/sii902x.txt >>>> b/Documentation/devicetree/bindings/display/bridge/sii902x.txt index >>>> 56a3e68ccb80..cf53678fe574 100644 >>>> --- a/Documentation/devicetree/bindings/display/bridge/sii902x.txt >>>> +++ b/Documentation/devicetree/bindings/display/bridge/sii902x.txt >>>> @@ -8,6 +8,9 @@ Optional properties: >>>> - interrupts-extended or interrupt-parent + interrupts: describe >>>> the interrupt line used to inform the host about hotplug events. >>>> - reset-gpios: OF device-tree gpio specification for RST_N pin. >>>> + - iovcc-supply: I/O supply voltage (1.8V or 3.3V, host-dependent). >>>> + - avcc12-supply: TMDS analog supply voltage (1.2V). >>>> + - cvcc12-supply: Digital core supply voltage (1.2V). >>> >>> It seems that the AVCC12 and CVCC12 power supplies are usually derived >>> from the same source. How about starting with one DT property for both, >>> and adding a second one later if needed ? >> >> Well, I do not know what is the best. Here I took the description from >> the documentation, and to allow all possible board configurations, I >> added these supplies as "optional" properties: if there is only one 1v2 >> regulator on the board, the dt will contain only avcc12 or cvcc12 and >> everything will work fine (we will have a dummy regulator for the >> missing optional 1v2 reg), if both regulators are there for any reasons >> (stability, noise, whatever...) then both entries will be in the dt. >> >> If you confirm you prefer a single 1v2 supply (named for instance >> "vcc12-supply") then I will do :-) > > Please see https://lists.freedesktop.org/archives/dri-devel/2018-April/ > 172400.html (and the messages that lead to it) and https:// > lists.freedesktop.org/archives/dri-devel/2018-March/170763.html. > Thanks for this discussion thread. On my side, I found "CVCC12 and AVCC12 can be derived from the same power source" written with a small font (august 2016 datasheet p13) so then your advice is clearly what we have to do :-) I will add this info in v2 too. Thank you, Philippe :-) >>>> Optional subnodes: >>>> - video input: this subnode can contain a video input port node > _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2018-04-19 12:41 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-04-10 5:19 [PATCH 0/2] drm/bridge: sii902x: add optional power supplies Philippe Cornu 2018-04-10 5:19 ` Philippe Cornu 2018-04-10 5:19 ` [PATCH 1/2] dt-bindings/display/bridge: " Philippe Cornu 2018-04-10 5:19 ` Philippe Cornu 2018-04-13 17:58 ` Rob Herring 2018-04-13 17:58 ` Rob Herring 2018-04-19 8:11 ` Laurent Pinchart 2018-04-19 8:11 ` Laurent Pinchart 2018-04-19 9:31 ` Philippe CORNU 2018-04-19 9:31 ` Philippe CORNU 2018-04-19 11:09 ` Laurent Pinchart 2018-04-19 11:09 ` Laurent Pinchart 2018-04-19 12:41 ` Philippe CORNU [this message] 2018-04-19 12:41 ` Philippe CORNU 2018-04-19 12:50 ` Laurent Pinchart 2018-04-10 5:19 ` [PATCH 2/2] drm/bridge: " Philippe Cornu 2018-04-10 5:19 ` Philippe Cornu 2018-04-16 9:20 ` Yannick FERTRE 2018-04-19 8:20 ` Laurent Pinchart 2018-04-19 8:20 ` Laurent Pinchart 2018-04-19 9:46 ` Philippe CORNU 2018-04-19 9:46 ` Philippe CORNU 2018-04-19 11:00 ` Laurent Pinchart 2018-04-19 11:00 ` Laurent Pinchart
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