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

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Message-ID: <564A2AA4.3060901@simon.arlott.org.uk>
Date:	Mon, 16 Nov 2015 19:12:36 +0000
From:	Simon Arlott <simon@...e.lp0.eu>
To:	Rob Herring <robh@...nel.org>
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: [PATCH 1/2] irqchip: Add brcm,bcm6345-l1-intc device tree binding

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.

 .../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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