linux-kernel - Re: [PATCH 1/2] irqchip: Add brcm,bcm6345-l1-intc device tree binding

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Message-ID: <20151117000923.GA4698@rob-hp-laptop>
Date:	Mon, 16 Nov 2015 18:09:23 -0600
From:	Rob Herring <robh@...nel.org>
To:	Simon Arlott <simon@...e.lp0.eu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	devicetree@...r.kernel.org,
	Florian Fainelli <f.fainelli@...il.com>,
	Kevin Cernekee <cernekee@...il.com>, linux-mips@...ux-mips.org,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH 1/2] irqchip: Add brcm,bcm6345-l1-intc device tree binding

On Mon, Nov 16, 2015 at 07:12:36PM +0000, Simon Arlott wrote:
> Add device tree binding for the BCM6345 interrupt controller.
> 
> This controller is similar to the SMP-capable BCM7038 and
> the BCM3380 but with packed interrupt registers.
> 
> Signed-off-by: Simon Arlott <simon@...e.lp0.eu>
> ---
> On 16/11/15 15:34, Rob Herring wrote:
> > On Sun, Nov 15, 2015 at 04:51:16PM +0000, Simon Arlott wrote:
> >> Add device tree binding for the BCM63168 interrupt controller.
> >> 
> >> This controller is similar to the SMP-capable BCM7038 and
> >> the BCM3380 but with packed interrupt registers.
> >> 
> >> Signed-off-by: Simon Arlott <simon@...e.lp0.eu>
> > 
> > Acked-by: Rob Herring <robh@...nel.org>
> 
> I'm going to rename this to bcm6345-l1 as suggested by Jonas Gorski, and
> the binding now specifies a <soc> version of the compatible name to be
> included.

Acked-by: Rob Herring <robh@...nel.org>
 
>  .../interrupt-controller/brcm,bcm6345-l1-intc.txt  | 57 ++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/brcm,bcm6345-l1-intc.txt
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm6345-l1-intc.txt b/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm6345-l1-intc.txt
> new file mode 100644
> index 0000000..c5bdcf1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/brcm,bcm6345-l1-intc.txt
> @@ -0,0 +1,57 @@
> +Broadcom BCM6345-style Level 1 interrupt controller
> +
> +This block is a first level interrupt controller that is typically connected
> +directly to one of the HW INT lines on each CPU.
> +
> +Key elements of the hardware design include:
> +
> +- 32, 64 or 128 incoming level IRQ lines
> +
> +- Most onchip peripherals are wired directly to an L1 input
> +
> +- A separate instance of the register set for each CPU, allowing individual
> +  peripheral IRQs to be routed to any CPU
> +
> +- Contains one or more enable/status word pairs per CPU
> +
> +- No atomic set/clear operations
> +
> +- No polarity/level/edge settings
> +
> +- No FIFO or priority encoder logic; software is expected to read all
> +  2-4 status words to determine which IRQs are pending
> +
> +Required properties:
> +
> +- compatible: should be "brcm,bcm<soc>-l1-intc", "brcm,bcm6345-l1-intc"
> +- reg: specifies the base physical address and size of the registers;
> +  the number of supported IRQs is inferred from the size argument
> +- interrupt-controller: identifies the node as an interrupt controller
> +- #interrupt-cells: specifies the number of cells needed to encode an interrupt
> +  source, should be 1.
> +- interrupt-parent: specifies the phandle to the parent interrupt controller(s)
> +  this one is cascaded from
> +- interrupts: specifies the interrupt line(s) in the interrupt-parent controller
> +  node; valid values depend on the type of parent interrupt controller
> +
> +If multiple reg ranges and interrupt-parent entries are present on an SMP
> +system, the driver will allow IRQ SMP affinity to be set up through the
> +/proc/irq/ interface.  In the simplest possible configuration, only one
> +reg range and one interrupt-parent is needed.
> +
> +The driver operates in native CPU endian by default, there is no support for
> +specifying an alternative endianness.
> +
> +Example:
> +
> +periph_intc: periph_intc@...00000 {
> +        compatible = "brcm,bcm63168-l1-intc", "brcm,bcm6345-l1-intc";
> +        reg = <0x10000020 0x20>,
> +              <0x10000040 0x20>;
> +
> +        interrupt-controller;
> +        #interrupt-cells = <1>;
> +
> +        interrupt-parent = <&cpu_intc>;
> +        interrupts = <2>, <3>;
> +};
> -- 
> 2.1.4
> 
> -- 
> Simon Arlott
> --
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