Add hotplug support to mcp251x driver

Chip model can now be selected directly by matching the modalias name
(instead of filling the .model field in platform_data), and allows the
module to be auto-loaded. Previous behaviour is of course still supported.

Convert the two in-tree users to this feature (icontrol & zeus).
Tested on an Zeus platform (mcp2515).

Signed-off-by: Marc Zyngier <maz@misterjones.org>
Acked-by: Christian Pellegrin <chripell@fsfe.org>
Cc: Edwin Peer <epeer@tmtservices.co.za>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/arm/mach-pxa/zeus.c b/arch/arm/mach-pxa/zeus.c
index 39896d8..dbd2569 100644
--- a/arch/arm/mach-pxa/zeus.c
+++ b/arch/arm/mach-pxa/zeus.c
@@ -414,15 +414,13 @@
 
 static struct mcp251x_platform_data zeus_mcp2515_pdata = {
 	.oscillator_frequency	= 16*1000*1000,
-	.model			= CAN_MCP251X_MCP2515,
 	.board_specific_setup	= zeus_mcp2515_setup,
-	.transceiver_enable	= zeus_mcp2515_transceiver_enable,
 	.power_enable		= zeus_mcp2515_transceiver_enable,
 };
 
 static struct spi_board_info zeus_spi_board_info[] = {
 	[0] = {
-		.modalias	= "mcp251x",
+		.modalias	= "mcp2515",
 		.platform_data	= &zeus_mcp2515_pdata,
 		.irq		= gpio_to_irq(ZEUS_CAN_GPIO),
 		.max_speed_hz	= 1*1000*1000,