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SubjectRE: [PATCH] gpio: dwapb: Add support for 32 interrupts
Date
Hi,

On 28 March 2018 15:23, Phil Edworthy wrote:
> The DesignWare GPIO IP can be configured for either 1 or 32 interrupts,
> but the driver currently only supports 1 interrupt. See the DesignWare
> DW_apb_gpio Databook description of the 'GPIO_INTR_IO' parameter.
>
> This change allows the driver to work with up to 32 interrupts, it will
> get as many interrupts as specified in the DT 'interrupts' property.
> It doesn't do anything clever with the different interrupts, it just calls
> the same handler used for single interrupt hardware.
>
> Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
> ---
> Note: There are a few lines over 80 chars, but this is just guidance, right?
> Especially as there are already some lines over 80 chars.
> ---
> .../devicetree/bindings/gpio/snps-dwapb-gpio.txt | 10 ++++-
> drivers/gpio/gpio-dwapb.c | 44 +++++++++++++++++-----
> include/linux/platform_data/gpio-dwapb.h | 3 +-
> 3 files changed, 45 insertions(+), 12 deletions(-)

This patch triggers a build error for Quark MFD driver, which is the only user
of the structure outside of the driver. I will fix that with an additional patch,
but I'll wait to see what other comments I get first.

Thanks
Phil


> diff --git a/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt
> b/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt
> index 4a75da7..e343581 100644
> --- a/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt
> +++ b/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt
> @@ -26,8 +26,14 @@ controller.
> the second encodes the triger flags encoded as described in
> Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
> - interrupt-parent : The parent interrupt controller.
> -- interrupts : The interrupt to the parent controller raised when GPIOs
> - generate the interrupts.
> +- interrupts : The interrupts to the parent controller raised when GPIOs
> + generate the interrupts. If the controller provides one combined interrupt
> + for all GPIOs, specify a single interrupt. If the controller provides one
> + interrupt for each GPIO, provide a list of interrupts that correspond to each
> + of the GPIO pins. When specifying multiple interrupts, if any of the GPIOs
> are
> + not connected to an interrupt, use the interrupt-mask property.
> +- interrupt-mask : a 32-bit bit mask that specifies which interrupts in the list
> + of interrupts is valid, bit is 1 for a valid irq.
> - snps,nr-gpios : The number of pins in the port, a single cell.
> - resets : Reset line for the controller.
>
> diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
> index 226977f..47d82f9 100644
> --- a/drivers/gpio/gpio-dwapb.c
> +++ b/drivers/gpio/gpio-dwapb.c
> @@ -441,14 +441,19 @@ static void dwapb_configure_irqs(struct
> dwapb_gpio *gpio,
> irq_gc->chip_types[1].handler = handle_edge_irq;
>
> if (!pp->irq_shared) {
> - irq_set_chained_handler_and_data(pp->irq,
> dwapb_irq_handler,
> - gpio);
> + int i;
> +
> + for (i = 0; i < pp->ngpio; i++) {
> + if (pp->irq[i])
> + irq_set_chained_handler_and_data(pp-
> >irq[i],
> + dwapb_irq_handler, gpio);
> + }
> } else {
> /*
> * Request a shared IRQ since where MFD would have
> devices
> * using the same irq pin
> */
> - err = devm_request_irq(gpio->dev, pp->irq,
> + err = devm_request_irq(gpio->dev, pp->irq[0],
> dwapb_irq_handler_mfd,
> IRQF_SHARED, "gpio-dwapb-mfd", gpio);
> if (err) {
> @@ -524,7 +529,7 @@ static int dwapb_gpio_add_port(struct dwapb_gpio
> *gpio,
> if (pp->idx == 0)
> port->gc.set_config = dwapb_gpio_set_config;
>
> - if (pp->irq)
> + if (pp->has_irq)
> dwapb_configure_irqs(gpio, port, pp);
>
> err = gpiochip_add_data(&port->gc, port);
> @@ -535,7 +540,7 @@ static int dwapb_gpio_add_port(struct dwapb_gpio
> *gpio,
> port->is_registered = true;
>
> /* Add GPIO-signaled ACPI event support */
> - if (pp->irq)
> + if (pp->has_irq)
> acpi_gpiochip_request_interrupts(&port->gc);
>
> return err;
> @@ -601,13 +606,34 @@ dwapb_gpio_get_pdata(struct device *dev)
> if (dev->of_node && pp->idx == 0 &&
> fwnode_property_read_bool(fwnode,
> "interrupt-controller")) {
> - pp->irq =
> irq_of_parse_and_map(to_of_node(fwnode), 0);
> - if (!pp->irq)
> + struct device_node *np = to_of_node(fwnode);
> + u32 irq_mask = 0xFFFFFFFF;
> + int j;
> +
> + /* Optional irq mask */
> + fwnode_property_read_u32(fwnode, "interrupt-
> mask", &irq_mask);
> +
> + /*
> + * The IP has configuration options to allow a single
> + * combined interrupt or one per gpio. If one per
> gpio,
> + * some might not be used.
> + */
> + for (j = 0; j < pp->ngpio; j++) {
> + if (irq_mask & BIT(j)) {
> + pp->irq[j] =
> irq_of_parse_and_map(np, j);
> + if (pp->irq[j])
> + pp->has_irq = true;
> + }
> + }
> + if (!pp->has_irq)
> dev_warn(dev, "no irq for port%d\n", pp-
> >idx);
> }
>
> - if (has_acpi_companion(dev) && pp->idx == 0)
> - pp->irq =
> platform_get_irq(to_platform_device(dev), 0);
> + if (has_acpi_companion(dev) && pp->idx == 0) {
> + pp->irq[0] =
> platform_get_irq(to_platform_device(dev), 0);
> + if (pp->irq[0])
> + pp->has_irq = true;
> + }
>
> pp->irq_shared = false;
> pp->gpio_base = -1;
> diff --git a/include/linux/platform_data/gpio-dwapb.h
> b/include/linux/platform_data/gpio-dwapb.h
> index 2dc7f4a..5a52d69 100644
> --- a/include/linux/platform_data/gpio-dwapb.h
> +++ b/include/linux/platform_data/gpio-dwapb.h
> @@ -19,7 +19,8 @@ struct dwapb_port_property {
> unsigned int idx;
> unsigned int ngpio;
> unsigned int gpio_base;
> - unsigned int irq;
> + unsigned int irq[32];
> + bool has_irq;
> bool irq_shared;
> };
>
> --
> 2.7.4

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