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regmap: Return an error if a caller attempts to do an unsupported raw read
regmaps without raw I/O access can't implement raw I/O operations, return an error if someone tries to do that rather than crashing. Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -2255,6 +2255,9 @@ static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
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WARN_ON(!map->bus);
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if (!map->bus || !map->bus->read)
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return -EINVAL;
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range = _regmap_range_lookup(map, reg);
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if (range) {
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ret = _regmap_select_page(map, ®, range,
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