Hi Matthias,

On Fri, 2017-06-09 at 10:14 +0200, Matthias Brugger wrote:

On 01/06/17 08:08, Erin Lo wrote:

quoted

From: YT Shen <yt.shen-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>

This patch adds the device nodes for the DISP function blocks for MT2701

Signed-off-by: YT Shen <yt.shen-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
Signed-off-by: Erin Lo <erin.lo-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
---
  arch/arm/boot/dts/mt2701.dtsi | 84 +++++++++++++++++++++++++++++++++++++++++++
  1 file changed, 84 insertions(+)

diff --git a/arch/arm/boot/dts/mt2701.dtsi b/arch/arm/boot/dts/mt2701.dtsi
index 4f110d5..e20b65c 100644
--- a/arch/arm/boot/dts/mt2701.dtsi
+++ b/arch/arm/boot/dts/mt2701.dtsi

@@ -17,6 +17,7 @@
  #include <dt-bindings/interrupt-controller/irq.h>
  #include <dt-bindings/interrupt-controller/arm-gic.h>
  #include <dt-bindings/reset/mt2701-resets.h>
+#include <dt-bindings/memory/mt2701-larb-port.h>
  #include "skeleton64.dtsi"
  #include "mt2701-pinfunc.h"
  

@@ -24,6 +25,11 @@
  	compatible = "mediatek,mt2701";
  	interrupt-parent = <&sysirq>;
  
+	aliases {
+		rdma0 = &rdma0;
+		rdma1 = &rdma1;
+	};
+

I know we have this alias in mt8173.dtsi, but I don't understand what 
they are for. Do you know?

The mtk_disp_rdma platform driver uses mtk_ddp_comp_get_id() to identify
the specific RDMA instance, which calls of_alias_get_id(). The core code
needs to know which RDMA is which to correctly set up the display data
paths.

regards
Philipp

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