linux-kernel - [PATCH -next 0/2] allow gpio simulator be used as interrupt controller

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Message-ID: <20220826080230.1712978-1-weiyongjun1@huawei.com>
Date:   Fri, 26 Aug 2022 08:02:28 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Walleij <linus.walleij@...aro.org>
CC:     Wei Yongjun <weiyongjun1@...wei.com>, <linux-gpio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH -next 0/2] allow gpio simulator be used as interrupt controller

This series allow gpio simulator be used as interrupt controller, the use
case is mockup some device which using GPIO as interrupt controller, such
as mcp2515 CAN device. With the dts [1], we can mockup a mcp2515 device,
and trigger irq by following commands:

 $ echo pull-down > /sys/bus/gpio/devices/gpiochip0/sim_gpio0/pull
 $ echo pull-up > /sys/bus/gpio/devices/gpiochip0/sim_gpio0/pull


--[1]---------------------------------------------------------
/dts-v1/;

#include <dt-bindings/interrupt-controller/irq.h>

/ {
	clk24m: clk24m {
		compatible = "fixed-clock";
		clock-output-names = "clk24m";
		clock-frequency = <24000000>;
		#clock-cells = <0>;
	};

	gpio-sim {
		compatible = "gpio-simulator";

		bank0: bank0 {
			gpio-controller;
			#gpio-cells = <2>;
			ngpios = <16>;

			interrupt-controller;
			#interrupt-cells = <2>;

			line_b-hog {
				gpio-hog;
				gpios = <0 1>;
				input;
				line-name = "irq-sim";
			};
		};
	};

	spi: spi {
		compatible = "spi-mockup";

		#address-cells = <1>;
		#size-cells = <0>;

		can0: can@1 {
			compatible = "microchip,mcp2515";
			reg = <1>;
			clocks = <&clk24m>;
			interrupt-parent = <&bank0>;
			interrupts = <0 IRQ_TYPE_EDGE_BOTH>;
		};

	};
};
------------------------------><-----------------------------

Wei Yongjun (2):
  genirq/irq_sim: Allow both one and two cell bindings
  gpio: sim: make gpio simulator can be used as interrupt controller

 drivers/gpio/gpio-sim.c | 2 +-
 kernel/irq/irq_sim.c    | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

-- 
2.34.1