regmap: add iopoll-like atomic polling macro

	__ret ?: ((cond) ? 0 : -ETIMEDOUT); \

})

/**

 * regmap_read_poll_timeout_atomic - Poll until a condition is met or a timeout occurs

 *

 * @map: Regmap to read from

 * @addr: Address to poll

 * @val: Unsigned integer variable to read the value into

 * @cond: Break condition (usually involving @val)

 * @delay_us: Time to udelay between reads in us (0 tight-loops).

 *            Should be less than ~10us since udelay is used

 *            (see Documentation/timers/timers-howto.rst).

 * @timeout_us: Timeout in us, 0 means never timeout

 *

 * Returns 0 on success and -ETIMEDOUT upon a timeout or the regmap_read

 * error return value in case of a error read. In the two former cases,

 * the last read value at @addr is stored in @val.

 *

 * This is modelled after the readx_poll_timeout_atomic macros in linux/iopoll.h.

 *

 * Note: In general regmap cannot be used in atomic context. If you want to use

 * this macro then first setup your regmap for atomic use (flat or no cache

 * and MMIO regmap).

 */

#define regmap_read_poll_timeout_atomic(map, addr, val, cond, delay_us, timeout_us) \

({ \

	u64 __timeout_us = (timeout_us); \

	unsigned long __delay_us = (delay_us); \

	ktime_t __timeout = ktime_add_us(ktime_get(), __timeout_us); \

	int __ret; \

	for (;;) { \

		__ret = regmap_read((map), (addr), &(val)); \

		if (__ret) \

			break; \

		if (cond) \

			break; \

		if ((__timeout_us) && \

		    ktime_compare(ktime_get(), __timeout) > 0) { \

			__ret = regmap_read((map), (addr), &(val)); \

			break; \

		} \

		if (__delay_us) \

			udelay(__delay_us); \

	} \

	__ret ?: ((cond) ? 0 : -ETIMEDOUT); \

})

/**

 * regmap_field_read_poll_timeout - Poll until a condition is met or timeout

 *