linux-kernel - [PATCH v4 3/3] ARM: dts: tegra: Work safely with 256 MB Colibri-T20 modules

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Date:   Tue, 15 May 2018 16:41:25 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Stefan Agner <stefan@...er.ch>, Lucas Stach <dev@...xeye.de>,
        Krzysztof Kozlowski <krzk@...nel.org>
Subject: [PATCH v4 3/3] ARM: dts: tegra: Work safely with 256 MB Colibri-T20 modules

Colibri-T20 can come in 256 MB RAM (with 512 MB NAND) or 512 MB RAM
(with 1024 MB NAND) flavors.  Both of them will use the same DTSI
expecting the bootloader to do the fixup of /memory node.  However in
case it does not happen, let's stay on safe side by limiting the memory
to 256 MB for both versions of Colibri-T20.

Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>

---

RFT:
Not tested on 512 MB module as I have only the 256 MB one.

Changes since v3:
1. Reduce the memory in existing DTSI instead of creating a new one
   (suggested by Marcel).

Changes since v2:
1. Do not add new compatible but use everywhere existing
   "toradex,colibri_t20-512" (suggested by Rob).

Changes since v1:
1. Fix memory size in tegra20-colibri-256.dtsi (was working fine because
   my bootloader uses mem= argument).
---
 arch/arm/boot/dts/tegra20-colibri-512.dtsi | 9 +++++++--
 arch/arm/boot/dts/tegra20-iris-512.dts     | 2 +-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/tegra20-colibri-512.dtsi b/arch/arm/boot/dts/tegra20-colibri-512.dtsi
index 305efb275b48..b9387c540450 100644
--- a/arch/arm/boot/dts/tegra20-colibri-512.dtsi
+++ b/arch/arm/boot/dts/tegra20-colibri-512.dtsi
@@ -2,7 +2,7 @@
 #include "tegra20.dtsi"
 
 / {
-	model = "Toradex Colibri T20 512MB";
+	model = "Toradex Colibri T20 256/512 MB";
 	compatible = "toradex,colibri_t20-512", "nvidia,tegra20";
 
 	aliases {
@@ -12,7 +12,12 @@
 
 	memory@0 {
 		device_type = "memory";
-		reg = <0x00000000 0x20000000>;
+		/*
+		 * Set memory to 256 MB to be safe as this could be used on
+		 * 256 or 512 MB module. It is expected from bootloader
+		 * to fix this up for 512 MB version.
+		 */
+		reg = <0x00000000 0x10000000>;
 	};
 
 	host1x@...00000 {
diff --git a/arch/arm/boot/dts/tegra20-iris-512.dts b/arch/arm/boot/dts/tegra20-iris-512.dts
index 40126388946d..efaa96228722 100644
--- a/arch/arm/boot/dts/tegra20-iris-512.dts
+++ b/arch/arm/boot/dts/tegra20-iris-512.dts
@@ -4,7 +4,7 @@
 #include "tegra20-colibri-512.dtsi"
 
 / {
-	model = "Toradex Colibri T20 512MB on Iris";
+	model = "Toradex Colibri T20 256/512 MB on Iris";
 	compatible = "toradex,iris", "toradex,colibri_t20-512", "nvidia,tegra20";
 
 	aliases {
-- 
2.7.4