From f8e2f92d41f1ddbb14174c47deb4d0fce87a1fc0 Mon Sep 17 00:00:00 2001 From: Mugunthan V N Date: Wed, 23 Dec 2015 20:39:37 +0530 Subject: [PATCH] spi: Add support for dual and quad mode spi bus can support dual and quad wire data transfers for tx and rx. So defining dual and quad modes for both tx and rx. Also add support to parse bus width used for spi tx and rx transfers. Signed-off-by: Mugunthan V N Reviewed-by: Jagan Teki Signed-off-by: Jagan Teki --- drivers/spi/spi-uclass.c | 38 +++++++++++++++++++++++++++++++++++++- include/spi.h | 2 ++ 2 files changed, 39 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c index e0f6b25..677c020 100644 --- a/drivers/spi/spi-uclass.c +++ b/drivers/spi/spi-uclass.c @@ -157,6 +157,7 @@ static int spi_child_pre_probe(struct udevice *dev) slave->max_hz = plat->max_hz; slave->mode = plat->mode; + slave->mode_rx = plat->mode_rx; return 0; } @@ -368,7 +369,8 @@ void spi_free_slave(struct spi_slave *slave) int spi_slave_ofdata_to_platdata(const void *blob, int node, struct dm_spi_slave_platdata *plat) { - int mode = 0; + int mode = 0, mode_rx = 0; + int value; plat->cs = fdtdec_get_int(blob, node, "reg", -1); plat->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", 0); @@ -382,8 +384,42 @@ int spi_slave_ofdata_to_platdata(const void *blob, int node, mode |= SPI_3WIRE; if (fdtdec_get_bool(blob, node, "spi-half-duplex")) mode |= SPI_PREAMBLE; + + /* Device DUAL/QUAD mode */ + value = fdtdec_get_uint(blob, node, "spi-tx-bus-width", 1); + switch (value) { + case 1: + break; + case 2: + mode |= SPI_TX_DUAL; + break; + case 4: + mode |= SPI_TX_QUAD; + break; + default: + error("spi-tx-bus-width %d not supported\n", value); + break; + } + plat->mode = mode; + value = fdtdec_get_uint(blob, node, "spi-rx-bus-width", 1); + switch (value) { + case 1: + break; + case 2: + mode_rx |= SPI_RX_DUAL; + break; + case 4: + mode_rx |= SPI_RX_QUAD; + break; + default: + error("spi-rx-bus-width %d not supported\n", value); + break; + } + + plat->mode_rx = mode_rx; + return 0; } diff --git a/include/spi.h b/include/spi.h index 25470e4..4b88d39 100644 --- a/include/spi.h +++ b/include/spi.h @@ -61,11 +61,13 @@ struct dm_spi_bus { * @cs: Chip select number (0..n-1) * @max_hz: Maximum bus speed that this slave can tolerate * @mode: SPI mode to use for this device (see SPI mode flags) + * @mode_rx: SPI RX mode to use for this slave (see SPI mode_rx flags) */ struct dm_spi_slave_platdata { unsigned int cs; uint max_hz; uint mode; + u8 mode_rx; }; #endif /* CONFIG_DM_SPI */ -- 2.7.4