Hi Simon,

Subject: Re: [PATCH] arm64: dts: r8a7796: Add DRIF support

On Tue, Jun 27, 2017 at 01:54:38PM +0100, Ramesh Shanmugasundaram wrote:

quoted

Adds the DRIF controller nodes for r8a7796.

Signed-off-by: Ramesh Shanmugasundaram
[off-list ref]
---
Hi Simon,

   This patch is based on renesas-devel-20170626-v4.12-rc7 tag.
   It is verified on M3 ES1.0. I also verified there are no regression

issues

quoted

   with this addition.

   The driver[1] is pushed into the media_tree. The bindings[2] are

ACK'ed

quoted

   by Geert & Rob and in the media_tree queue.

   [1]

https://git.linuxtv.org/media_tree.git/commit/?id=7625ee981af166ddb569e2e6
c0006e2af471326f

quoted

   [2]
https://www.mail-archive.com/linux-renesas-soc at vger.kernel.org/msg1560
2.html

Thanks,
Ramesh.

 arch/arm64/boot/dts/renesas/r8a7796.dtsi | 120
+++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)

diff --git a/arch/arm64/boot/dts/renesas/r8a7796.dtsi

b/arch/arm64/boot/dts/renesas/r8a7796.dtsi
index 1f6710912045..df04d132a127 100644

--- a/arch/arm64/boot/dts/renesas/r8a7796.dtsi
+++ b/arch/arm64/boot/dts/renesas/r8a7796.dtsi

@@ -639,6 +639,126 @@
 			};
 		};

+		drif00: rif at e6f40000 {
+			compatible = "renesas,r8a7796-drif",
+				     "renesas,rcar-gen3-drif";
+			reg = <0 0xe6f40000 0 0x64>;
+			interrupts = <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 515>;
+			clock-names = "fck";
+			dmas = <&dmac1 0x20>, <&dmac2 0x20>;

The dmas property seems a little strange. I would have expected to allow
ether dmac1 or dmac2 to be used for both tx and rx:

			dmas = <&dmac1 0x20>, <&dmac1 0x20>,
			       <&dmac2 0x20>, <&dmac2 0x20>;

It is an rx-only interface that can use either dmac1 or 2.

quoted

+			dma-names = "rx", "rx";
+			power-domains = <&sysc R8A7796_PD_ALWAYS_ON>;
+			resets = <&cpg 515>;
+			renesas,bonding = <&drif01>;
+			status = "disabled";
+		};

Thanks,
Ramesh