This patch series adds support for the GPIO interrupt controller found on Amlogic's meson SoC families. Unlike what the name suggests, this controller is not part of the SoC GPIO subsystem. It is a separate controller which can watch almost all gpio pads of the SoC and generate and interrupt from it. "Almost" because there are always exceptions and some specific gpios (TEST_N) lack this capability. Hardware wise, the controller is a 256 to 8 router with a filtering block to select edge or level input and the polarity of the signal. We can't setup the filtring to generate a signal on both the high and low polarity so, ATM, IRQ_TYPE_EDGE_BOTH is not supported. The number of interrupt line routed to the controller depends on the SoC, and essentially the total number of GPIO available on the different gpio controllers of the SoC. This series has been tested on Amlogic S905-P200 board with the front panel power button. Also tested on the Nanopi-k2 with the ethernet PHY interrupt pin. This work is derived from the previous work of Carlo Caione [1]. Changes since RFC : [2] * Remove interrupt property in device tree: the controller cannot generate interrupts on its own and is merely routing the interrupt to the GIC, therefore it should not use the interrupt property. This data is now stored directly in the driver, same as the pinctrl data. * Improve compatibility checking of meson pinctrl on its interrupt parent to activate gpio_to_irq callback * Drop IRQ_BOTH hack. Need more work to have an acceptable solution for this Changes since v1 : [3] * Correct mistake in patch 4 when no compatible controller is found. Sorry for the inconvenience. Changes since v2: [4] * Address Marc's comment on the irqchip driver from v2 * Drop all gpio subsystem related patches. This will be dealt with separately. Changes since v3: [5] * Replace "upstream" irq with "channel" irq * Improve documentation a bit. * Drop DT patches: these will be sent later on to the DT maintainer if/when the driver is accepted. [1] : https://lkml.kernel.org/r/1448987062-31225-1-git-send-email-carlo@xxxxxxxxxx [2] : https://lkml.kernel.org/r/1475593708-10526-1-git-send-email-jbrunet@xxxxxxxxxxxx [3] : https://lkml.kernel.org/r/1476871709-8359-1-git-send-email-jbrunet@xxxxxxxxxxxx [4] : https://lkml.kernel.org/r/1476890480-8884-1-git-send-email-jbrunet@xxxxxxxxxxxx [5] : https://lkml.kernel.org/r/20170615161804.32658-1-jbrunet@xxxxxxxxxxxx Jerome Brunet (2): dt-bindings: interrupt-controller: add DT binding for meson GPIO interrupt controller irqchip: meson: add support for gpio interrupt controller .../amlogic,meson-gpio-intc.txt | 35 ++ drivers/irqchip/Kconfig | 8 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-meson-gpio.c | 414 +++++++++++++++++++++ 4 files changed, 458 insertions(+) create mode 100644 Documentation/devicetree/bindings/interrupt-controller/amlogic,meson-gpio-intc.txt create mode 100644 drivers/irqchip/irq-meson-gpio.c -- 2.13.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
