On Wed, Aug 12, 2015 at 12:12:36PM +0200, Markus Pargmann wrote:
> + /*
> + * There are busses that do not have a read function as it is optional.
> + * Use their reg_read function instead if the requested number of bytes
> + * is correct.
> + */
> + if (!map->bus->read) {
> + /*
> + * bus_reg_read() does not support reading values that are not
> + * exactly the size of format.val_bytes
> + */
> + if (val_len != map->format.val_bytes)
> + return -EINVAL;
> + return _regmap_bus_reg_read(map, reg, val);
> + }No, this makes no sense - if the device doesn't have a read operation then it doesn't support a raw data stream and hence can't support raw access sensibly. Callers that want to access a lot of registers at once without knowing what the wire format for the device is should be using the bulk or multi interfaces.
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