[PATCH v4 0/5] pinctrl/GPIO driver for Apple SoCs

[Joey Gouly <joey.gouly@arm.com>]

Hi all,

Here is the v4 patchset for the Apple pinctrl/GPIO driver.

Changes since v3 [1]:
  - Applied Marc Zyngier's review/patch (with exception noted below)
  - Removed "apple,t8103-pinctrl" compatible from driver
  - Applied Acks/Review tags


With Marc's changes, the irq_chip was being shared between pinctrl
drivers and I was getting the following warning:

  drivers/gpio/gpiolib.c:1456:

    detected irqchip that is shared with multiple gpiochips: please fix
the driver.


So I applied the following diff to Marc's change, to not share the
irq_chips, while still being cleaner overall:

diff --git a/drivers/pinctrl/pinctrl-apple-gpio.c
b/drivers/pinctrl/pinctrl-apple-gpio.c
index 732c347a2bbc..ce037a5c15c1 100644
--- a/drivers/pinctrl/pinctrl-apple-gpio.c
+++ b/drivers/pinctrl/pinctrl-apple-gpio.c
@@ -35,6 +35,7 @@ struct apple_gpio_pinctrl {

        struct pinctrl_desc pinctrl_desc;
        struct gpio_chip gpio_chip;
+       struct irq_chip irq_chip;
        u8 irqgrps[0];
 };

@@ -369,6 +370,8 @@ static int apple_gpio_gpio_register(struct
apple_gpio_pinctrl *pctl)
                return dev_err_probe(pctl->dev, -ENODEV,
                                     "No gpio-controller property\n");

+       pctl->irq_chip = apple_gpio_irqchip;
+
        pctl->gpio_chip.label = dev_name(pctl->dev);
        pctl->gpio_chip.request = gpiochip_generic_request;
        pctl->gpio_chip.free = gpiochip_generic_free;
@@ -385,7 +388,7 @@ static int apple_gpio_gpio_register(struct
apple_gpio_pinctrl *pctl)
        if (girq->num_parents) {
                int i;

-               girq->chip = &apple_gpio_irqchip;
+               girq->chip = &pctl->irq_chip;
                girq->parent_handler = apple_gpio_gpio_irq_handler;

                girq->parents = kmalloc_array(girq->num_parents,

Marc said that hierarchical IRQ domains should solve this problem, but
I'll let him explain more on the list, maybe that should solved in a different
patch series.

There is a branch here with the driver:
  https://gitlab.arm.com/linux-arm/jg-open/-/tree/pinctrl_apple_v4

Thanks,
Joey

note: For those that have been testing this with PCIe etc, you will
probably want to also include the last commit in the following branch, as I
dropped the clock references in the code (due to the switch to power domains):
https://gitlab.arm.com/linux-arm/jg-open/-/commits/pinctrl_apple_v4_clock

[1]
https://lore.kernel.org/linux-gpio/20211016141839.45460-1-joey.gouly@arm.com/

Joey Gouly (4):
  dt-bindings: pinctrl: add #interrupt-cells to apple,pinctrl
  dt-bindings: pinctrl: Add apple,npins property to apple,pinctrl
  pinctrl: add pinctrl/GPIO driver for Apple SoCs
  MAINTAINERS: add pinctrl-apple-gpio to ARM/APPLE MACHINE

Marc Zyngier (1):
  gpio: Allow per-parent interrupt data

 .../bindings/pinctrl/apple,pinctrl.yaml       |  10 +
 MAINTAINERS                                   |   1 +
 drivers/gpio/gpiolib.c                        |   9 +-
 drivers/pinctrl/Kconfig                       |  16 +
 drivers/pinctrl/Makefile                      |   1 +
 drivers/pinctrl/pinctrl-apple-gpio.c          | 535 ++++++++++++++++++
 include/linux/gpio/driver.h                   |  19 +-
 7 files changed, 587 insertions(+), 4 deletions(-)
 create mode 100644 drivers/pinctrl/pinctrl-apple-gpio.c

-- 
2.17.1