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SubjectRe: [PATCH v6 4/4] ARM: dts: tegra: Work safely with 256 MB Colibri-T20 modules
On 23.05.2018 11:56, Krzysztof Kozlowski wrote:
> 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.
>

Maybe also mention the renaming stuff:

"Rename to remove the unnecessary memory size from the device tree file
name. While at it, also follow the typical Toradex SoC, module, carrier
board hierarchy."

--
Stefan

> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
>
> ---
>
> RFT:
> Not tested on 512 MB module as I have only the 256 MB one.
>
> Changes since v5:
> 1. Add "colibri" suffix to iris DTS (suggested by Stefan).
>
> Changes since v4:
> 1. Drop the 512 suffix from file names (suggested by Stefan).
>
> 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/Makefile | 2 +-
> .../boot/dts/{tegra20-iris-512.dts => tegra20-colibri-iris.dts} | 4 ++--
> .../boot/dts/{tegra20-colibri-512.dtsi => tegra20-colibri.dtsi} | 9 +++++++--
> 3 files changed, 10 insertions(+), 5 deletions(-)
> rename arch/arm/boot/dts/{tegra20-iris-512.dts =>
> tegra20-colibri-iris.dts} (95%)
> rename arch/arm/boot/dts/{tegra20-colibri-512.dtsi =>
> tegra20-colibri.dtsi} (98%)
>
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index ec2024ea8b1e..1c8bb55c0948 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -1030,7 +1030,7 @@ dtb-$(CONFIG_ARCH_TANGO) += \
> tango4-vantage-1172.dtb
> dtb-$(CONFIG_ARCH_TEGRA_2x_SOC) += \
> tegra20-harmony.dtb \
> - tegra20-iris-512.dtb \
> + tegra20-colibri-iris.dtb \
> tegra20-medcom-wide.dtb \
> tegra20-paz00.dtb \
> tegra20-plutux.dtb \
> diff --git a/arch/arm/boot/dts/tegra20-iris-512.dts
> b/arch/arm/boot/dts/tegra20-colibri-iris.dts
> similarity index 95%
> rename from arch/arm/boot/dts/tegra20-iris-512.dts
> rename to arch/arm/boot/dts/tegra20-colibri-iris.dts
> index 40126388946d..57f16c0e9917 100644
> --- a/arch/arm/boot/dts/tegra20-iris-512.dts
> +++ b/arch/arm/boot/dts/tegra20-colibri-iris.dts
> @@ -1,10 +1,10 @@
> // SPDX-License-Identifier: GPL-2.0
> /dts-v1/;
>
> -#include "tegra20-colibri-512.dtsi"
> +#include "tegra20-colibri.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 {
> diff --git a/arch/arm/boot/dts/tegra20-colibri-512.dtsi
> b/arch/arm/boot/dts/tegra20-colibri.dtsi
> similarity index 98%
> rename from arch/arm/boot/dts/tegra20-colibri-512.dtsi
> rename to arch/arm/boot/dts/tegra20-colibri.dtsi
> index 5623ff8d128c..dc06b23183e1 100644
> --- a/arch/arm/boot/dts/tegra20-colibri-512.dtsi
> +++ b/arch/arm/boot/dts/tegra20-colibri.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 {
> @@ -11,7 +11,12 @@
> };
>
> memory@0 {
> - 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@50000000 {

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