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SubjectRe: [PATCH v3] gpio: dwapb: Add support for 1 interrupt per port A GPIO
On Fri, Apr 13, 2018 at 09:51:12AM +0100, Phil Edworthy wrote:
> The DesignWare GPIO IP can be configured for either 1 interrupt or 1
> per GPIO in port A, 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>
> ---
> One point to mention is that I have made it possible for users to have
> unconncted interrupts by specifying holes in the list of interrupts. This is
> done by supporting the interrupts-extended DT prop.
> However, I have no use for this and had to hack some test case for this.
> Perhaps the driver should support 1 interrupt or all GPIOa as interrupts?
>
> v3:
> - Rolled mfd: intel_quark_i2c_gpio fix into this patch to avoid bisect problems
> v2:
> - Replaced interrupt-mask DT prop with support for the interrupts-extended
> prop. This means replacing the call to irq_of_parse_and_map() with calls
> to of_irq_parse_one() and irq_create_of_mapping().
>
> Note: There are a few *code* 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 | 9 ++++-
> drivers/gpio/gpio-dwapb.c | 43 +++++++++++++++++-----
> drivers/mfd/intel_quark_i2c_gpio.c | 3 +-
> include/linux/platform_data/gpio-dwapb.h | 3 +-
> 4 files changed, 45 insertions(+), 13 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt b/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt
> index 4a75da7..3c1118b 100644
> --- a/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt
> +++ b/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt
> @@ -26,8 +26,13 @@ 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 are unconnected,
> + use the interrupts-extended property to specify the interrupts and set the
> + interrupt controller handle for unused interrupts to 0.
> - 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..3273504 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 +606,33 @@ 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);
> + struct of_phandle_args oirq;
> + unsigned int j;
> +
> + /*
> + * 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 (of_irq_parse_one(np, j, &oirq))
> + continue;
> +
> + pp->irq[j] = irq_create_of_mapping(&oirq);

I'm hoping to not have new users of of_irq_parse_one and
irq_create_of_mapping. Can you use of_irq_get instead? It will base back
error codes so you can distinguish different conditions.

> + 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;

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