DECLARE_GLOBAL_DATA_PTR;
+#define SPI_DEFAULT_SPEED_HZ 100000
+
static int spi_set_speed_mode(struct udevice *bus, int speed, int mode)
{
struct dm_spi_ops *ops;
speed = spi->max_hz;
}
if (!speed)
- speed = 100000;
+ speed = SPI_DEFAULT_SPEED_HZ;
if (speed != slave->speed) {
int ret = spi_set_speed_mode(bus, speed, slave->mode);
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)
{
}
plat = dev_get_parent_platdata(dev);
plat->cs = cs;
- plat->max_hz = speed;
+ if (speed) {
+ plat->max_hz = speed;
+ } else {
+ printf("Warning: SPI speed fallback to %u kHz\n",
+ SPI_DEFAULT_SPEED_HZ / 1000);
+ plat->max_hz = SPI_DEFAULT_SPEED_HZ;
+ }
plat->mode = mode;
created = true;
} else if (ret) {
}
plat = dev_get_parent_platdata(dev);
- if (!speed) {
+
+ /* get speed and mode from platdata when available */
+ if (plat->max_hz) {
speed = plat->max_hz;
mode = plat->mode;
}
int value;
plat->cs = dev_read_u32_default(dev, "reg", -1);
- plat->max_hz = dev_read_u32_default(dev, "spi-max-frequency", 0);
+ plat->max_hz = dev_read_u32_default(dev, "spi-max-frequency",
+ SPI_DEFAULT_SPEED_HZ);
if (dev_read_bool(dev, "spi-cpol"))
mode |= SPI_CPOL;
if (dev_read_bool(dev, "spi-cpha"))