gpio: tangier: Use correct type for the IRQ chip data

IRQ chip data contains a pointer to the GPIO chip. Luckily we have
the pointers the same, but strictly speaking it's not guaranteed.
Even though, still better to fix this.

Fixes: ccf6fd6dcc86 ("gpio: merrifield: Introduce GPIO driver to support Merrifield")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

gpio: tangier: simplify locking using cleanup helpers

Use lock guards from cleanup.h to simplify locking.

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

gpio: tangier: unexport suspend/resume handles

Unexport suspend/resume handles for the lack of external users and while
at it, make them static, so that they can be discarded by the compiler
if not used (CONFIG_PM_SLEEP=n).

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Link: https://lore.kernel.org/r/20231113131600.10828-4-raag.jadav@intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

gpio: tangier: use EXPORT_NS_GPL_SIMPLE_DEV_PM_OPS() helper

Use EXPORT_NS_GPL_SIMPLE_DEV_PM_OPS() helper to export pm_ops to
GPIO_TANGIER namespace, so that they can be reused.

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Link: https://lore.kernel.org/r/20231113131600.10828-2-raag.jadav@intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

gpio: tangier: calculate number of ctx using temporary variable

Utilize a temporary variable to calculate number of ctx from ngpio
inside ->probe() implementation.
While at it, include math.h for using DIV_ROUND_UP().

Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

gpio: tangier: Introduce Intel Tangier GPIO driver

Intel Elkhart Lake and Merrifield platforms have same GPIO IP.
Intel Tangier implements the common GPIO functionalities for both
Elkhart Lake and Merrifield platforms.

Signed-off-by: Pandith N <pandith.n@intel.com>
Co-developed-by: Raag Jadav <raag.jadav@intel.com>
Signed-off-by: Raag Jadav <raag.jadav@intel.com>
Co-developed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>