dt-bindings: display/ti: Add optional property to set memory bandwidth limit

max-memory-bandwidth can be used to specify the maximum bandwidth dispc
can use when reading display data from main memory.

In some SoC (am437x for example) we have memory bandwidth limitation
which causes underflow in the display subsystem.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --git a/Documentation/devicetree/bindings/display/ti/ti,dra7-dss.txt b/Documentation/devicetree/bindings/display/ti/ti,dra7-dss.txt
index c30f9ec..91279f1 100644 (file)
--- a/Documentation/devicetree/bindings/display/ti/ti,dra7-dss.txt
+++ b/Documentation/devicetree/bindings/display/ti/ti,dra7-dss.txt
@@ -47,6 +47,11 @@ Required properties:
 - clocks: handle to fclk
 - clock-names: "fck"
 
+Optional properties:
+- max-memory-bandwidth: Input memory (from main memory to dispc) bandwidth limit
+                       in bytes per second
+
+
 HDMI
 ----
 

diff --git a/Documentation/devicetree/bindings/display/ti/ti,omap2-dss.txt b/Documentation/devicetree/bindings/display/ti/ti,omap2-dss.txt
index afcd5a8..ee867c4 100644 (file)
--- a/Documentation/devicetree/bindings/display/ti/ti,omap2-dss.txt
+++ b/Documentation/devicetree/bindings/display/ti/ti,omap2-dss.txt
@@ -28,6 +28,10 @@ Required properties:
 - ti,hwmods: "dss_dispc"
 - interrupts: the DISPC interrupt
 
+Optional properties:
+- max-memory-bandwidth: Input memory (from main memory to dispc) bandwidth limit
+                       in bytes per second
+
 
 RFBI
 ----

diff --git a/Documentation/devicetree/bindings/display/ti/ti,omap3-dss.txt b/Documentation/devicetree/bindings/display/ti/ti,omap3-dss.txt
index dc66e14..cd02516 100644 (file)
--- a/Documentation/devicetree/bindings/display/ti/ti,omap3-dss.txt
+++ b/Documentation/devicetree/bindings/display/ti/ti,omap3-dss.txt
@@ -37,6 +37,10 @@ Required properties:
 - clocks: handle to fclk
 - clock-names: "fck"
 
+Optional properties:
+- max-memory-bandwidth: Input memory (from main memory to dispc) bandwidth limit
+                       in bytes per second
+
 
 RFBI
 ----

diff --git a/Documentation/devicetree/bindings/display/ti/ti,omap4-dss.txt b/Documentation/devicetree/bindings/display/ti/ti,omap4-dss.txt
index bc624db..0f85f6b 100644 (file)
--- a/Documentation/devicetree/bindings/display/ti/ti,omap4-dss.txt
+++ b/Documentation/devicetree/bindings/display/ti/ti,omap4-dss.txt
@@ -36,6 +36,10 @@ Required properties:
 - clocks: handle to fclk
 - clock-names: "fck"
 
+Optional properties:
+- max-memory-bandwidth: Input memory (from main memory to dispc) bandwidth limit
+                       in bytes per second
+
 
 RFBI
 ----

diff --git a/Documentation/devicetree/bindings/display/ti/ti,omap5-dss.txt b/Documentation/devicetree/bindings/display/ti/ti,omap5-dss.txt
index 118a486..2086121 100644 (file)
--- a/Documentation/devicetree/bindings/display/ti/ti,omap5-dss.txt
+++ b/Documentation/devicetree/bindings/display/ti/ti,omap5-dss.txt
@@ -36,6 +36,10 @@ Required properties:
 - clocks: handle to fclk
 - clock-names: "fck"
 
+Optional properties:
+- max-memory-bandwidth: Input memory (from main memory to dispc) bandwidth limit
+                       in bytes per second
+
 
 RFBI
 ----