From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lina Iyer Subject: [PATCH v2 1/8] gpio: Add support for hierarchical IRQ domains Date: Thu, 24 Jan 2019 13:21:58 -0700 Message-ID: <20190124202205.7940-2-ilina@codeaurora.org> References: <20190124202205.7940-1-ilina@codeaurora.org> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20190124202205.7940-1-ilina@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org To: swboyd@chromium.org, evgreen@chromium.org, marc.zyngier@arm.com Cc: linux-kernel@vger.kernel.org, rplsssn@codeaurora.org, linux-arm-msm@vger.kernel.org, thierry.reding@gmail.com, bjorn.andersson@linaro.org, dianders@chromium.org, linus.walleij@linaro.org, Thierry Reding , Lina Iyer List-Id: linux-arm-msm@vger.kernel.org From: Thierry Reding Hierarchical IRQ domains can be used to stack different IRQ controllers on top of each other. One specific use-case where this can be useful is if a power management controller has top-level controls for wakeup interrupts. In such cases, the power management controller can be a parent to other interrupt controllers and program additional registers when an IRQ has its wake capability enabled or disabled. Signed-off-by: Thierry Reding Signed-off-by: Lina Iyer --- drivers/gpio/gpiolib.c | 15 +++++++++++---- include/linux/gpio/driver.h | 6 ++++++ 2 files changed, 17 insertions(+), 4 deletions(-) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 1651d7f0a303..1c3ae1d3c368 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1888,7 +1888,9 @@ static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, type = IRQ_TYPE_NONE; } - gpiochip->to_irq = gpiochip_to_irq; + if (!gpiochip->to_irq) + gpiochip->to_irq = gpiochip_to_irq; + gpiochip->irq.default_type = type; gpiochip->irq.lock_key = lock_key; gpiochip->irq.request_key = request_key; @@ -1898,9 +1900,14 @@ static int gpiochip_add_irqchip(struct gpio_chip *gpiochip, else ops = &gpiochip_domain_ops; - gpiochip->irq.domain = irq_domain_add_simple(np, gpiochip->ngpio, - gpiochip->irq.first, - ops, gpiochip); + if (gpiochip->irq.parent_domain) + gpiochip->irq.domain = irq_domain_add_hierarchy(gpiochip->irq.parent_domain, + 0, gpiochip->ngpio, + np, ops, gpiochip); + else + gpiochip->irq.domain = irq_domain_add_simple(np, gpiochip->ngpio, + gpiochip->irq.first, + ops, gpiochip); if (!gpiochip->irq.domain) return -EINVAL; diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h index 07cddbf45186..88ef196f96ec 100644 --- a/include/linux/gpio/driver.h +++ b/include/linux/gpio/driver.h @@ -48,6 +48,12 @@ struct gpio_irq_chip { */ const struct irq_domain_ops *domain_ops; + /** + * @parent_domain: + * + */ + struct irq_domain *parent_domain; + /** * @handler: * -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project