linux-kernel - Re: [PATCH] ARM: dts: bcm283x: Move the BCM2837 DT contents from arm64 to arm.

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Message-ID: <a2e79c17-f345-e7f2-8438-d4754e4ceb3a@broadcom.com>
Date:   Wed, 19 Jul 2017 17:01:33 -0700
From:   Scott Branden <scott.branden@...adcom.com>
To:     Eric Anholt <eric@...olt.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>, devicetree@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Stefan Wahren <stefan.wahren@...e.com>,
        bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH] ARM: dts: bcm283x: Move the BCM2837 DT contents from
 arm64 to arm.

Hi Eric,

suggestion inline


On 17-07-19 01:19 PM, Eric Anholt wrote:
> BCM2837 is somewhat unusual in that we build its DT on both arm32 and
> arm64.  Most devices are being run in arm32 mode.
>
> Having the body of the DT for 2837 separate from 2835/6 has been a
> source of pain, as we often need to make changes that span both
> directories simultaneously (for example, the thermal changes for 4.13,
> and pinmuxing changes earlier).  Other changes are made more
> complicated than they need to be, such as the SDHOST enabling, because
> we end up splitting a single change into a 283[56] half and a 2837
> half.
>
> Signed-off-by: Eric Anholt <eric@...olt.net>
> ---
>
> I had asked about what we could do about our DT merging troubles back
> in https://lkml.org/lkml/2017/5/16/707 with no response.  I'm hoping
> we can take this patch as a resolution to that, and submit (almost
> all) future RPi DT changes through the arm32 dt tree.
>
>
>   arch/arm/boot/dts/bcm2837-rpi-3-b.dts              | 42 +++++++++++++++++++++-
>   .../dts/broadcom => arm/boot/dts}/bcm2837.dtsi     |  0
>   arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts   | 42 +---------------------
>   3 files changed, 42 insertions(+), 42 deletions(-)
>   rename arch/{arm64/boot/dts/broadcom => arm/boot/dts}/bcm2837.dtsi (100%)
>
> diff --git a/arch/arm/boot/dts/bcm2837-rpi-3-b.dts b/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
> index c72a27d908b6..972f14db28ac 100644
> --- a/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
> +++ b/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
> @@ -1 +1,41 @@
> -#include "arm64/broadcom/bcm2837-rpi-3-b.dts"
> +/dts-v1/;
> +#include "bcm2837.dtsi"
> +#include "bcm2835-rpi.dtsi"
> +#include "bcm283x-rpi-smsc9514.dtsi"
> +#include "bcm283x-rpi-usb-host.dtsi"
If you're moving this back to the arm directory why not change the 
include path and remove the 4 symlinks in arm64/boot/dts/broadcom?

+#include "arm/bcm2837.dtsi"
+#include "arm/bcm2835-rpi.dtsi"
+#include "arm/bcm283x-rpi-smsc9514.dtsi"
+#include "arm/bcm283x-rpi-usb-host.dtsi"


> +
> +/ {
> +	compatible = "raspberrypi,3-model-b", "brcm,bcm2837";
> +	model = "Raspberry Pi 3 Model B";
> +
> +	memory {
> +		reg = <0 0x40000000>;
> +	};
> +
> +	leds {
> +		act {
> +			gpios = <&gpio 47 0>;
> +		};
> +	};
> +};
> +
> +&uart1 {
> +	status = "okay";
> +};
> +
> +/* SDHCI is used to control the SDIO for wireless */
> +&sdhci {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&emmc_gpio34>;
> +	status = "okay";
> +	bus-width = <4>;
> +	non-removable;
> +};
> +
> +/* SDHOST is used to drive the SD card */
> +&sdhost {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&sdhost_gpio48>;
> +	status = "okay";
> +	bus-width = <4>;
> +};
> diff --git a/arch/arm64/boot/dts/broadcom/bcm2837.dtsi b/arch/arm/boot/dts/bcm2837.dtsi
> similarity index 100%
> rename from arch/arm64/boot/dts/broadcom/bcm2837.dtsi
> rename to arch/arm/boot/dts/bcm2837.dtsi
> diff --git a/arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts b/arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts
> index 972f14db28ac..699d340a3437 100644
> --- a/arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts
> +++ b/arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts
> @@ -1,41 +1 @@
> -/dts-v1/;
> -#include "bcm2837.dtsi"
> -#include "bcm2835-rpi.dtsi"
> -#include "bcm283x-rpi-smsc9514.dtsi"
> -#include "bcm283x-rpi-usb-host.dtsi"
> -
> -/ {
> -	compatible = "raspberrypi,3-model-b", "brcm,bcm2837";
> -	model = "Raspberry Pi 3 Model B";
> -
> -	memory {
> -		reg = <0 0x40000000>;
> -	};
> -
> -	leds {
> -		act {
> -			gpios = <&gpio 47 0>;
> -		};
> -	};
> -};
> -
> -&uart1 {
> -	status = "okay";
> -};
> -
> -/* SDHCI is used to control the SDIO for wireless */
> -&sdhci {
> -	pinctrl-names = "default";
> -	pinctrl-0 = <&emmc_gpio34>;
> -	status = "okay";
> -	bus-width = <4>;
> -	non-removable;
> -};
> -
> -/* SDHOST is used to drive the SD card */
> -&sdhost {
> -	pinctrl-names = "default";
> -	pinctrl-0 = <&sdhost_gpio48>;
> -	status = "okay";
> -	bus-width = <4>;
> -};
> +#include "arm/bcm2837-rpi-3-b.dts"