gpio: introduce GPIO_DAVINCI kconfig option
The compatible to Davinci GPIO HW block is used by other TI SoCs, like Keystone, where GPIO support is declared as optional. Hence, introduce GPIO_DAVINCI Kconfig option which will allow to enable Davinci GPIO driver for Keystone SoCs when needed. At same time, kept Davinci GPIO driver enabled for Davinci SoCs by default. Signed-off-by: NGrygorii Strashko <grygorii.strashko@ti.com> Acked-by: NSantosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: NLinus Walleij <linus.walleij@linaro.org> Acked-by: NLad, Prabhakar <prabhakar.csengg@gmail.com> Signed-off-by: NSekhar Nori <nsekhar@ti.com>
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