Index: arm/lpc/lpc_spi.c
===================================================================
--- arm/lpc/lpc_spi.c	(revision 240418)
+++ arm/lpc/lpc_spi.c	(working copy)
@@ -136,6 +136,24 @@
 	return (EBUSY);
 }
 
+static void
+lpc_spi_acquire_bus(device_t dev, device_t child)
+{
+	struct spibus_ivar *devi = SPIBUS_IVAR(child);
+
+	/* Set CS active */
+	lpc_gpio_set_state(child, devi->cs, 0);
+}
+
+static void
+lpc_spi_release_bus(device_t dev, device_t child)
+{
+	struct spibus_ivar *devi = SPIBUS_IVAR(child);
+
+	/* Set CS inactive */
+	lpc_gpio_set_state(child, devi->cs, 1);
+}
+
 static int
 lpc_spi_transfer(device_t dev, device_t child, struct spi_command *cmd)
 {
@@ -144,9 +162,6 @@
 	uint8_t *in_buf, *out_buf;
 	int i;
 
-	/* Set CS active */
-	lpc_gpio_set_state(child, devi->cs, 0);
-
 	/* Wait for FIFO to be ready */
 	while ((lpc_spi_read_4(sc, LPC_SSP_SR) & LPC_SSP_SR_TNF) == 0);
 
@@ -166,9 +181,6 @@
 		in_buf[i] = lpc_spi_read_4(sc, LPC_SSP_DR);
 	}
 
-	/* Set CS inactive */
-	lpc_gpio_set_state(child, devi->cs, 1);
-
 	return (0);
 }
 
@@ -179,6 +191,8 @@
 	DEVMETHOD(device_detach,	lpc_spi_detach),
 
 	/* SPI interface */
+	DEVMETHOD(spibus_acquire_bus,	lpc_spi_acquire_bus),
+	DEVMETHOD(spibus_release_bus,	lpc_spi_release_bus),
 	DEVMETHOD(spibus_transfer,	lpc_spi_transfer),
 
 	{ 0, 0 }
Index: mips/atheros/ar71xx_spi.c
===================================================================
--- mips/atheros/ar71xx_spi.c	(revision 240418)
+++ mips/atheros/ar71xx_spi.c	(working copy)
@@ -133,6 +133,26 @@
 	SPI_WRITE(sc, AR71XX_SPI_IO_CTRL, SPI_IO_CTRL_CSMASK);
 }
 
+static void
+ar71xx_spi_acquire_bus(device_t dev, device_t child)
+{
+	struct ar71xx_spi_softc *sc = device_get_softc(dev);
+	struct spibus_ivar *devi = SPIBUS_IVAR(child);
+
+	/* Select the SPI device. */
+	ar71xx_spi_chip_activate(sc, devi->cs);
+}
+
+static void
+ar71xx_spi_release_bus(device_t dev, device_t child)
+{
+	struct ar71xx_spi_softc *sc = device_get_softc(dev);
+	struct spibus_ivar *devi = SPIBUS_IVAR(child);
+
+	/* Deselect the SPI device. */
+	ar71xx_spi_chip_deactivate(sc, devi->cs);
+}
+
 static uint8_t
 ar71xx_spi_txrx(struct ar71xx_spi_softc *sc, int cs, uint8_t data)
 {
@@ -173,8 +193,6 @@
 
 	sc = device_get_softc(dev);
 
-	ar71xx_spi_chip_activate(sc, devi->cs);
-
 	KASSERT(cmd->tx_cmd_sz == cmd->rx_cmd_sz, 
 	    ("TX/RX command sizes should be equal"));
 	KASSERT(cmd->tx_data_sz == cmd->rx_data_sz, 
@@ -196,8 +214,6 @@
 	for (i = 0; i < cmd->tx_data_sz; i++)
 		buf_in[i] = ar71xx_spi_txrx(sc, devi->cs, buf_out[i]);
 
-	ar71xx_spi_chip_deactivate(sc, devi->cs);
-
 	return (0);
 }
 
@@ -221,6 +237,8 @@
 	DEVMETHOD(device_attach,	ar71xx_spi_attach),
 	DEVMETHOD(device_detach,	ar71xx_spi_detach),
 
+	DEVMETHOD(spibus_acquire_bus,	ar71xx_spi_acquire_bus),
+	DEVMETHOD(spibus_release_bus,	ar71xx_spi_release_bus),
 	DEVMETHOD(spibus_transfer,	ar71xx_spi_transfer),
 
 	{0, 0}