linux-kernel - [PATCH v6 04/52] dt-bindings: memory: tegra20: emc: Document nvidia,memory-controller property

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Message-Id: <20201025221735.3062-5-digetx@gmail.com>
Date:   Mon, 26 Oct 2020 01:16:47 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Mikko Perttunen <cyndis@...si.fi>,
        Viresh Kumar <vireshk@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Krzysztof Kozlowski <krzk@...nel.org>
Cc:     linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Subject: [PATCH v6 04/52] dt-bindings: memory: tegra20: emc: Document nvidia,memory-controller property

Tegra20 External Memory Controller talks to DRAM chips and it needs to be
reprogrammed when memory frequency changes. Tegra Memory Controller sits
behind EMC and these controllers are tightly coupled. This patch adds the
new phandle property which allows to properly express connection of EMC
and MC hardware in a device-tree, it also put the Tegra20 EMC binding on
par with Tegra30+ EMC bindings, which is handy to have.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 .../bindings/memory-controllers/nvidia,tegra20-emc.txt          | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra20-emc.txt b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra20-emc.txt
index 567cffd37f3f..1b0d4417aad8 100644
--- a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra20-emc.txt
+++ b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra20-emc.txt
@@ -12,6 +12,7 @@ Properties:
   irrespective of ram-code configuration.
 - interrupts : Should contain EMC General interrupt.
 - clocks : Should contain EMC clock.
+- nvidia,memory-controller : Phandle of the Memory Controller node.
 
 Child device nodes describe the memory settings for different configurations and clock rates.
 
@@ -24,6 +25,7 @@ Example:
 		reg = <0x7000f400 0x400>;
 		interrupts = <0 78 0x04>;
 		clocks = <&tegra_car TEGRA20_CLK_EMC>;
+		nvidia,memory-controller = <&mc>;
 	}
 
 
-- 
2.27.0