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| author | Lukas Wunner <lukas@wunner.de> | 2017-09-09 20:32:41 +0200 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2017-09-24 13:34:54 +0200 |
| commit | ea9103186d0508cfbd665a04d2773514e336fa72 (patch) | |
| tree | 4615f9d200ed5426c65cb4cc64a8801ecdda5306 /firmware/qlogic | |
| parent | iio: chemical: ccs811: Add support for data ready trigger (diff) | |
| download | linux-ea9103186d0508cfbd665a04d2773514e336fa72.tar.xz linux-ea9103186d0508cfbd665a04d2773514e336fa72.zip | |
iio: adc: mcp320x: Speed up readout of single-channel ADCs
Single-channel converters such as mcp3001, mcp3201, mcp3301 and the
upcoming mcp3550/1/3 lack a MOSI pin, so there's no need to call
mcp320x_channel_to_tx_data() for them.
Moreover, instead of calling spi_read() for these converters, which
generates an spi_message and spi_transfer on the stack on every readout,
it's more efficient to use the spi_message and spi_transfer[] included
in struct mcp320x (as we do for multi-channel ADCs), but initialize the
spi_message only with the receive transfer.
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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