gpio/mxc: move irq_domain_add_legacy call into gpio driver
Move irq_domain_add_legacy call from imx*-dt.c into gpio driver and have the gpio driver adopt irqdomain support for both DT and non-DT boot. With all imx platform code converted from static gpio irq number computation to use run-time gpio_to_irq call, we can now use irq_alloc_descs and irqdomain support to dynamically get irq_base and have the mapping between gpio and irq number available without using virtual_irq_start and MXC_GPIO_IRQ_START. Signed-off-by: NShawn Guo <shawn.guo@linaro.org> Cc: Grant Likely <grant.likely@secretlab.ca> Acked-by: NSascha Hauer <s.hauer@pengutronix.de> Acked-by: NDong Aisheng <dong.aisheng@linaro.org>
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