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由 Baruch Siach 提交于
GPIO32 is a standard optional extension to the Xtensa architecture core that provides preconfigured output and input ports for intra SoC signaling. The GPIO32 option is implemented as 32bit Tensilica Instruction Extension (TIE) output state called EXPSTATE, and 32bit input wire called IMPWIRE. This driver treats input and output states as two distinct devices. v3: * Use BUG() in xtensa_impwire_set_value() to indicate that it should never be called (Linus Walleij) v2: * Address the comments of Linus Walleij: - Add a few comments - Expand commit log message - Use the BIT() macro for bit offsets - Rewrite CPENABLE handling as static inlines - Use device_initcall() * Depend on !SMP for reason explained in the comments (Marc Gauthier) * Use XCHAL_CP_ID_XTIOP to enable/disable GPIO32 only Signed-off-by: NBaruch Siach <baruch@tkos.co.il> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
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