linux-kernel - [PATCH v2 0/3] allow gpio simulator be used as interrupt controller

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Date:   Mon, 26 Sep 2022 08:44:25 +0000
From:   Wei Yongjun <weiyongjun@...weicloud.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 v2 0/3] allow gpio simulator be used as interrupt controller

From: Wei Yongjun <weiyongjun1@...wei.com>

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

v1 -> v2:
 - add use case to gpio-sim.rst

--[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 (3):
  genirq/irq_sim: Allow both one and two cell bindings
  gpio: sim: make gpio simulator can be used as interrupt controller
  gpio: sim: document use case for interrupt controller

 Documentation/admin-guide/gpio/gpio-sim.rst | 44 +++++++++++++++++++++
 drivers/gpio/gpio-sim.c                     |  2 +-
 kernel/irq/irq_sim.c                        |  1 +
 3 files changed, 46 insertions(+), 1 deletion(-)

-- 
2.34.1