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regmap: add iopoll-like polling macro for regmap_field
This patch adds a macro regmap_field_read_poll_timeout that works similar to the readx_poll_timeout defined in linux/iopoll.h, except that this can also return the error value returned by a failed regmap_field_read. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -139,6 +139,45 @@ struct reg_sequence {
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pollret ?: ((cond) ? 0 : -ETIMEDOUT); \
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})
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/**
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* regmap_field_read_poll_timeout - Poll until a condition is met or timeout
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*
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* @field: Regmap field to read from
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* @val: Unsigned integer variable to read the value into
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* @cond: Break condition (usually involving @val)
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* @sleep_us: Maximum time to sleep between reads in us (0
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* tight-loops). Should be less than ~20ms since usleep_range
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* is used (see Documentation/timers/timers-howto.txt).
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* @timeout_us: Timeout in us, 0 means never timeout
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*
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* Returns 0 on success and -ETIMEDOUT upon a timeout or the regmap_field_read
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* error return value in case of a error read. In the two former cases,
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* the last read value at @addr is stored in @val. Must not be called
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* from atomic context if sleep_us or timeout_us are used.
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*
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* This is modelled after the readx_poll_timeout macros in linux/iopoll.h.
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*/
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#define regmap_field_read_poll_timeout(field, val, cond, sleep_us, timeout_us) \
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({ \
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ktime_t timeout = ktime_add_us(ktime_get(), timeout_us); \
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int pollret; \
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might_sleep_if(sleep_us); \
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for (;;) { \
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pollret = regmap_field_read((field), &(val)); \
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if (pollret) \
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break; \
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if (cond) \
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break; \
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if (timeout_us && ktime_compare(ktime_get(), timeout) > 0) { \
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pollret = regmap_field_read((field), &(val)); \
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break; \
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} \
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if (sleep_us) \
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usleep_range((sleep_us >> 2) + 1, sleep_us); \
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} \
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pollret ?: ((cond) ? 0 : -ETIMEDOUT); \
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})
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#ifdef CONFIG_REGMAP
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enum regmap_endian {
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