diff options
| author | Jagan Teki | 2019-07-22 17:22:56 +0530 |
|---|---|---|
| committer | Jagan Teki | 2019-09-16 08:09:22 +0530 |
| commit | 8473b32127232d8b602d905a2ed26ed48d352f6e (patch) | |
| tree | 82042e052a45f86951a769e161eb0eac6a6671fa /drivers | |
| parent | 6bd6c21693547f1887b516bee11481e95e239ecb (diff) | |
spi: Add spi_write_then_read
Add support for SPI synchronous write followed by read,
this is common interface call from spi-nor to spi drivers.
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Adam Ford <aford173@gmail.com> #da850-evm
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/spi-uclass.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c index 88cb2a12622..76c4b53c165 100644 --- a/drivers/spi/spi-uclass.c +++ b/drivers/spi/spi-uclass.c @@ -108,6 +108,30 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, return dm_spi_xfer(slave->dev, bitlen, dout, din, flags); } +int spi_write_then_read(struct spi_slave *slave, const u8 *opcode, + size_t n_opcode, const u8 *txbuf, u8 *rxbuf, + size_t n_buf) +{ + unsigned long flags = SPI_XFER_BEGIN; + int ret; + + if (n_buf == 0) + flags |= SPI_XFER_END; + + ret = spi_xfer(slave, n_opcode * 8, opcode, NULL, flags); + if (ret) { + debug("spi: failed to send command (%zu bytes): %d\n", + n_opcode, ret); + } else if (n_buf != 0) { + ret = spi_xfer(slave, n_buf * 8, txbuf, rxbuf, SPI_XFER_END); + if (ret) + debug("spi: failed to transfer %zu bytes of data: %d\n", + n_buf, ret); + } + + return ret; +} + #if !CONFIG_IS_ENABLED(OF_PLATDATA) static int spi_child_post_bind(struct udevice *dev) { |