[PATCH v3 0/1] Add Polarfire SoC GPIO support

[<lewis.hanly@xxxxxxxxxxxxx>]

From: Lewis Hanly <lewis.hanly@xxxxxxxxxxxxx>

Add a driver to support the Polarfire SoC gpio controller.
Tested with 5.19-rc5

MPFS gpio interrupts can be configured as direct or
non direct connections to the PLIC (Platform Level Interrupt Controller).
GPIO_INTERRUPT_FAB_CR(31:0) system register will enable GPIO2(31:0)
corresponding interrupt on PLIC. e.g. If GPIO_INTERRUPT_FAB_CR bit0 is set
then GPIO2 bit0 interrupt is available on the direct input pin on the PLIC.

Changes in v3:
Changed order in kconfig.
Removed blank lines in driver header/source file.
Removed BYTE_BOUNDARY variable and use macro to do *4.
mpfs_gpio_assign_bit parameter uses macro instead of (i * BYTE_BOUNDARY).
Add correct definitions for direction.
Change order of variables in mpfs_gpio_irq_set_type function.
Return dev_err_probe instead of dev_err.
Remove noise of dev_inf.
Avoid using of_match_ptr.
use devm_gpiochip_add_data(..)
Update mpfs_gpio_remove. 

Changes in v2:
Use raw_spinlock.
Use __assign_bit() to assign bit, added a bool variable for value.
Remove unnecessary checking gpio_index.
Remove default from switch statement.
Use const for irq_chip, name updated and use mask/unmask.
Use latest kernel api irq set_chip.
Implemented hierarchical interrupt chip support, although
suggested to use chained interrupt flow I believe this fits better.

Lewis Hanly (1):
  gpio: mpfs: add polarfire soc gpio support

 drivers/gpio/Kconfig     |   9 +
 drivers/gpio/Makefile    |   1 +
 drivers/gpio/gpio-mpfs.c | 361 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 371 insertions(+)
 create mode 100644 drivers/gpio/gpio-mpfs.c

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2.25.1