linux-kernel - Re: [PATCH v2 5/5] ARM: at91/dt: define a dumb irq demultiplexer chip connected on irq1

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Date:	Wed, 14 Jan 2015 14:48:27 +0100
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	"Jean-Christophe Plagniol-Villard" <plagnioj@...osoft.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, "Rob Herring" <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"Kumar Gala" <galak@...eaurora.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 5/5] ARM: at91/dt: define a dumb irq demultiplexer
 chip connected on irq1

Le 13/01/2015 19:46, Boris Brezillon a écrit :
> IRQ is multiplexing several peripheral IRQs, but there's no way to
> properly demultiplex those IRQs.
> Use a dumb irq demux chip to achieve this demultiplexing operation.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> ---
>  arch/arm/boot/dts/at91sam9260.dtsi | 26 ++++++++++++++++++++------
>  1 file changed, 20 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/at91sam9260.dtsi b/arch/arm/boot/dts/at91sam9260.dtsi
> index dd1313c..debe8d2 100644
> --- a/arch/arm/boot/dts/at91sam9260.dtsi
> +++ b/arch/arm/boot/dts/at91sam9260.dtsi
> @@ -10,7 +10,7 @@
>  
>  #include "skeleton.dtsi"
>  #include <dt-bindings/pinctrl/at91.h>
> -#include <dt-bindings/interrupt-controller/irq.h>
> +#include <dt-bindings/interrupt-controller/atmel-aic.h>
>  #include <dt-bindings/gpio/gpio.h>
>  #include <dt-bindings/clock/at91.h>
>  
> @@ -89,6 +89,7 @@
>  				atmel,external-irqs = <29 30 31>;
>  			};
>  
> +
>  			ramc0: ramc@...fea00 {
>  				compatible = "atmel,at91sam9260-sdramc";
>  				reg = <0xffffea00 0x200>;
> @@ -97,7 +98,7 @@
>  			pmc: pmc@...ffc00 {
>  				compatible = "atmel,at91sam9260-pmc";
>  				reg = <0xfffffc00 0x100>;
> -				interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
> +				interrupts-extended = <&dumb_irq1_demux AIC_IRQ1_PMC>;
>  				interrupt-controller;
>  				#address-cells = <1>;
>  				#size-cells = <0>;
> @@ -364,7 +365,7 @@
>  			pit: timer@...ffd30 {
>  				compatible = "atmel,at91sam9260-pit";
>  				reg = <0xfffffd30 0xf>;
> -				interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
> +				interrupts-extended = <&dumb_irq1_demux AIC_IRQ1_PIT>;
>  				clocks = <&mck>;
>  			};
>  
> @@ -750,7 +751,7 @@
>  			dbgu: serial@...ff200 {
>  				compatible = "atmel,at91sam9260-usart";
>  				reg = <0xfffff200 0x200>;
> -				interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
> +				interrupts-extended = <&dumb_irq1_demux AIC_IRQ1_DBGU>;
>  				pinctrl-names = "default";
>  				pinctrl-0 = <&pinctrl_dbgu>;
>  				clocks = <&mck>;
> @@ -959,7 +960,7 @@
>  			rtc@...ffd20 {
>  				compatible = "atmel,at91sam9260-rtt";
>  				reg = <0xfffffd20 0x10>;
> -				interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
> +				interrupts-extended = <&dumb_irq1_demux AIC_IRQ1_RTT>;
>  				clocks = <&clk32k>;
>  				status = "disabled";
>  			};
> @@ -967,7 +968,7 @@
>  			watchdog@...ffd40 {
>  				compatible = "atmel,at91sam9260-wdt";
>  				reg = <0xfffffd40 0x10>;
> -				interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
> +				interrupts-extended = <&dumb_irq1_demux AIC_IRQ1_WATCHDOG>;
>  				atmel,watchdog-type = "hardware";
>  				atmel,reset-type = "all";
>  				atmel,dbg-halt;
> @@ -1010,6 +1011,19 @@
>  		};
>  	};
>  
> +	dumb_irq1_demux: dumb-irq-demux@1 {
> +		compatible = "irqchip-dumb-demux";
> +		interrupt-controller;
> +		#interrupt-cells = <1>;
> +		interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
> +		irqs = <(AIC_IRQ_MASK(AIC_IRQ1_PMC) |
> +			 AIC_IRQ_MASK(AIC_IRQ1_PIT) |
> +			 AIC_IRQ_MASK(AIC_IRQ1_DBGU) |
> +			 AIC_IRQ_MASK(AIC_IRQ1_RTT) |
> +			 AIC_IRQ_MASK(AIC_IRQ1_WATCHDOG) |
> +			 AIC_IRQ_MASK(AIC_IRQ1_RSTC))>;
> +	};
> +

Yep, with the modification that you suggested in "Re: [PATCH v2 4/5]
ARM: at91/dt: add AIC irq1 muxed peripheral id definitions" it would be
even simpler.

Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>

>  	i2c@0 {
>  		compatible = "i2c-gpio";
>  		gpios = <&pioA 23 GPIO_ACTIVE_HIGH /* sda */
> 


-- 
Nicolas Ferre
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