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    Subject[PATCH 1/6] SPI: add ability to say we want a cs change after every transfer.
    Date
    This allows a number of drivers to make use of utility functions
    such spi_write_then_read as well as making use of regmap possible.

    Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
    ---
    drivers/spi/spi.c | 8 ++++++++
    include/linux/spi/spi.h | 2 ++
    2 files changed, 10 insertions(+), 0 deletions(-)

    diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
    index 4d1b9f5..bee8aee 100644
    --- a/drivers/spi/spi.c
    +++ b/drivers/spi/spi.c
    @@ -781,6 +781,14 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message)
    }
    }

    + if (spi->cs_between_transfers) {
    + struct spi_transfer *xfer;
    + list_for_each_entry(xfer, &message->transfers, transfer_list) {
    + if (!list_is_last(&xfer->transfer_list, &message->transfers))
    + xfer->cs_change = 1;
    + }
    + }
    +
    message->spi = spi;
    message->status = -EINPROGRESS;
    return master->transfer(spi, message);
    diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
    index bb4f5fb..f1e378d 100644
    --- a/include/linux/spi/spi.h
    +++ b/include/linux/spi/spi.h
    @@ -90,6 +90,8 @@ struct spi_device {
    void *controller_data;
    char modalias[SPI_NAME_SIZE];

    + unsigned cs_between_transfers:1;
    +
    /*
    * likely need more hooks for more protocol options affecting how
    * the controller talks to each chip, like:
    --
    1.7.3.4


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