linux-kernel - Re: [PATCH] arm: dts: Enable device-tree overlay support for AT91 boards

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Message-ID: <415fc114-bab2-07c4-5938-e20756b1d11b@microchip.com>
Date:   Wed, 21 Jun 2023 09:31:58 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <Cristian.Birsan@...rochip.com>, <arnd@...db.de>, <olof@...om.net>,
        <soc@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm: dts: Enable device-tree overlay support for AT91
 boards

On 16.06.2023 18:29, cristian.birsan@...rochip.com wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> From: Cristian Birsan <cristian.birsan@...rochip.com>
> 
> Add the '-@' DTC option for AT91 boards that have device-tree overlays.
> This option populates the '__symbols__' node that contains all the
> necessary symbols for supporting device-tree overlays (from bootloader)
> on these devices.
> 
> This change increases the size of the resulting DTB with ~30%-40%. Below
> are the measurements performed v6.4-rc6:
> 
> at91-sam9x60_curiosity.dtb      28499 -> 36641 bytes
> at91-sam9x60ek.dtb              30867 -> 39609 bytes
> at91-sama5d27_som1_ek.dtb       26086 -> 34166 bytes
> at91-sama5d27_wlsom1_ek.dtb     26045 -> 33184 bytes
> at91-sama5d2_icp.dtb            27521 -> 36155 bytes
> at91-sama5d2_ptc_ek.dtb         23237 -> 29612 bytes
> at91-sama5d2_xplained.dtb       27262 -> 35326 bytes
> at91-sama5d3_eds.dtb            27924 -> 39939 bytes
> at91-sama5d3_xplained.dtb       28400 -> 40650 bytes
> at91-sama5d4_xplained.dtb       26456 -> 36107 bytes
> at91-sama7g5ek.dtb              29212 -> 37289 bytes
> 
> Signed-off-by: Cristian Birsan <cristian.birsan@...rochip.com>

Applied to at91-dt, thanks!

> ---
>  arch/arm/boot/dts/Makefile | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 59829fc90315..38b82af2bf69 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -50,9 +50,21 @@ dtb-$(CONFIG_SOC_AT91SAM9) += \
>         at91sam9g35ek.dtb \
>         at91sam9x25ek.dtb \
>         at91sam9x35ek.dtb
> +# Enables support for device-tree overlays
> +DTC_FLAGS_at91-sam9x60_curiosity := -@
> +DTC_FLAGS_at91-sam9x60ek := -@
>  dtb-$(CONFIG_SOC_SAM9X60) += \
>         at91-sam9x60_curiosity.dtb \
>         at91-sam9x60ek.dtb
> +# Enables support for device-tree overlays
> +DTC_FLAGS_at91-sama5d27_som1_ek := -@
> +DTC_FLAGS_at91-sama5d27_wlsom1_ek := -@
> +DTC_FLAGS_at91-sama5d2_icp := -@
> +DTC_FLAGS_at91-sama5d2_ptc_ek := -@
> +DTC_FLAGS_at91-sama5d2_xplained := -@
> +DTC_FLAGS_at91-sama5d3_eds := -@
> +DTC_FLAGS_at91-sama5d3_xplained := -@
> +DTC_FLAGS_at91-sama5d4_xplained := -@
>  dtb-$(CONFIG_SOC_SAM_V7) += \
>         at91-kizbox2-2.dtb \
>         at91-kizbox3-hs.dtb \
> @@ -79,6 +91,8 @@ dtb-$(CONFIG_SOC_SAM_V7) += \
>         at91-sama5d4_xplained.dtb \
>         at91-sama5d4ek.dtb \
>         at91-vinco.dtb
> +# Enables support for device-tree overlays
> +DTC_FLAGS_at91-sama7g5ek := -@
>  dtb-$(CONFIG_SOC_SAMA7G5) += \
>         at91-sama7g5ek.dtb
>  dtb-$(CONFIG_SOC_SP7021) += \
> --
> 2.34.1
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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