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From: Hugues Fruchet <hugues.fruchet@st.com>
To: Steve Longerbeam <slongerbeam@gmail.com>,
	Sakari Ailus <sakari.ailus@iki.fi>,
	Hans Verkuil <hverkuil@xs4all.nl>,
	"Mauro Carvalho Chehab  <mchehab@kernel.org>,
	Rob Herring" <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Maxime Ripard <maxime.ripard@bootlin.com>
Cc: devicetree@vger.kernel.org, linux-media@vger.kernel.org,
	linux-stm32@st-md-mailman.stormreply.com,
	Hugues Fruchet <hugues.fruchet@st.com>,
	Benjamin Gaignard <benjamin.gaignard@linaro.org>,
	Jacopo Mondi <jacopo@jmondi.org>
Subject: [PATCH 3/4] media: dt-bindings: media: Document pclk-max-frequency property
Date: Thu, 27 Sep 2018 16:46:06 +0200	[thread overview]
Message-ID: <1538059567-8381-4-git-send-email-hugues.fruchet@st.com> (raw)
In-Reply-To: <1538059567-8381-1-git-send-email-hugues.fruchet@st.com>

This optional property aims to inform parallel video devices
of the maximum pixel clock frequency admissible by host video
interface. If bandwidth of data to be transferred requires a
pixel clock which is higher than this value, parallel video
device could then typically adapt framerate to reach
this constraint.

Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
---
 Documentation/devicetree/bindings/media/video-interfaces.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt
index baf9d97..fa4c112 100644
--- a/Documentation/devicetree/bindings/media/video-interfaces.txt
+++ b/Documentation/devicetree/bindings/media/video-interfaces.txt
@@ -147,6 +147,8 @@ Optional endpoint properties
   as 0 (normal). This property is valid for serial busses only.
 - strobe: Whether the clock signal is used as clock (0) or strobe (1). Used
   with CCP2, for instance.
+- pclk-max-frequency: maximum pixel clock frequency admissible by video
+  host interface.
 
 Example
 -------
-- 
2.7.4

WARNING: multiple messages have this Message-ID (diff)
From: Hugues Fruchet <hugues.fruchet@st.com>
To: Steve Longerbeam <slongerbeam@gmail.com>,
	Sakari Ailus <sakari.ailus@iki.fi>,
	Hans Verkuil <hverkuil@xs4all.nl>,
	"Mauro Carvalho Chehab" <mchehab@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Maxime Ripard <maxime.ripard@bootlin.com>
Cc: <devicetree@vger.kernel.org>, <linux-media@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	Hugues Fruchet <hugues.fruchet@st.com>,
	Benjamin Gaignard <benjamin.gaignard@linaro.org>,
	Jacopo Mondi <jacopo@jmondi.org>
Subject: [PATCH 3/4] media: dt-bindings: media: Document pclk-max-frequency property
Date: Thu, 27 Sep 2018 16:46:06 +0200	[thread overview]
Message-ID: <1538059567-8381-4-git-send-email-hugues.fruchet@st.com> (raw)
In-Reply-To: <1538059567-8381-1-git-send-email-hugues.fruchet@st.com>

This optional property aims to inform parallel video devices
of the maximum pixel clock frequency admissible by host video
interface. If bandwidth of data to be transferred requires a
pixel clock which is higher than this value, parallel video
device could then typically adapt framerate to reach
this constraint.

Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
---
 Documentation/devicetree/bindings/media/video-interfaces.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt
index baf9d97..fa4c112 100644
--- a/Documentation/devicetree/bindings/media/video-interfaces.txt
+++ b/Documentation/devicetree/bindings/media/video-interfaces.txt
@@ -147,6 +147,8 @@ Optional endpoint properties
   as 0 (normal). This property is valid for serial busses only.
 - strobe: Whether the clock signal is used as clock (0) or strobe (1). Used
   with CCP2, for instance.
+- pclk-max-frequency: maximum pixel clock frequency admissible by video
+  host interface.
 
 Example
 -------
-- 
2.7.4

  parent reply	other threads:[~2018-09-27 14:46 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-27 14:46 [PATCH 0/4] OV5640: reduce rate according to maximum pixel clock Hugues Fruchet
2018-09-27 14:46 ` Hugues Fruchet
2018-09-27 14:46 ` [PATCH 1/4] media: ov5640: move parallel port pixel clock divider out of registers set Hugues Fruchet
2018-09-27 14:46   ` Hugues Fruchet
2018-09-27 14:46 ` [PATCH 2/4] media: v4l2-core: add pixel clock max frequency parallel port property Hugues Fruchet
2018-09-27 14:46   ` Hugues Fruchet
2018-09-27 14:46 ` Hugues Fruchet [this message]
2018-09-27 14:46   ` [PATCH 3/4] media: dt-bindings: media: Document pclk-max-frequency property Hugues Fruchet
2018-09-27 17:26   ` Maxime Ripard
2018-09-28  7:03   ` Sakari Ailus
2018-10-01 14:53     ` Hugues FRUCHET
2018-09-27 14:46 ` [PATCH 4/4] media: ov5640: reduce rate according to maximum pixel clock frequency Hugues Fruchet
2018-09-27 14:46   ` Hugues Fruchet

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