linux-kernel - Re: [PATCH 2/3] ARM: dts: bcm2711: Update SPI nodes compatible strings

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Message-ID: <20200604042038.jzolu6k7q3d6bsvq@wunner.de>
Date:   Thu, 4 Jun 2020 06:20:38 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        "maintainer:BROADCOM BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE..." 
        <bcm-kernel-feedback-list@...adcom.com>,
        "open list:SPI SUBSYSTEM" <linux-spi@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Martin Sperl <kernel@...tin.sperl.org>
Subject: Re: [PATCH 2/3] ARM: dts: bcm2711: Update SPI nodes compatible
 strings

On Wed, Jun 03, 2020 at 08:46:54PM -0700, Florian Fainelli wrote:
> The BCM2711 SoC features 5 SPI controllers which all share the same
> interrupt line, the SPI driver needs to support interrupt sharing,
> therefore use the chip specific compatible string to help with that.

You're saying above that the 5 controllers all share the interrupt
but below you're only changing the compatible string of 4 controllers.

So I assume spi0 still has its own interrupt and only the additional
4 controllers present on the BCM2711/BCM7211 share their interrupt?

Thanks,

Lukas

> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  arch/arm/boot/dts/bcm2711.dtsi | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/bcm2711.dtsi b/arch/arm/boot/dts/bcm2711.dtsi
> index a91cf68e3c4c..9a9ea67fbc2d 100644
> --- a/arch/arm/boot/dts/bcm2711.dtsi
> +++ b/arch/arm/boot/dts/bcm2711.dtsi
> @@ -152,7 +152,7 @@
>  		};
>  
>  		spi3: spi@...04600 {
> -			compatible = "brcm,bcm2835-spi";
> +			compatible = "brcm,bcm2711-spi", "brcm,bcm2835-spi";
>  			reg = <0x7e204600 0x0200>;
>  			interrupts = <GIC_SPI 118 IRQ_TYPE_LEVEL_HIGH>;
>  			clocks = <&clocks BCM2835_CLOCK_VPU>;
> @@ -162,7 +162,7 @@
>  		};
>  
>  		spi4: spi@...04800 {
> -			compatible = "brcm,bcm2835-spi";
> +			compatible = "brcm,bcm2711-spi", "brcm,bcm2835-spi";
>  			reg = <0x7e204800 0x0200>;
>  			interrupts = <GIC_SPI 118 IRQ_TYPE_LEVEL_HIGH>;
>  			clocks = <&clocks BCM2835_CLOCK_VPU>;
> @@ -172,7 +172,7 @@
>  		};
>  
>  		spi5: spi@...04a00 {
> -			compatible = "brcm,bcm2835-spi";
> +			compatible = "brcm,bcm2711-spi", "brcm,bcm2835-spi";
>  			reg = <0x7e204a00 0x0200>;
>  			interrupts = <GIC_SPI 118 IRQ_TYPE_LEVEL_HIGH>;
>  			clocks = <&clocks BCM2835_CLOCK_VPU>;
> @@ -182,7 +182,7 @@
>  		};
>  
>  		spi6: spi@...04c00 {
> -			compatible = "brcm,bcm2835-spi";
> +			compatible = "brcm,bcm2711-spi", "brcm,bcm2835-spi";
>  			reg = <0x7e204c00 0x0200>;
>  			interrupts = <GIC_SPI 118 IRQ_TYPE_LEVEL_HIGH>;
>  			clocks = <&clocks BCM2835_CLOCK_VPU>;
> -- 
> 2.17.1
>