View source for Enabling SPI1 and SPI3 on Linux (Naon)

=== Linux kernel patch ===

{{ImportantMessage|text=The patches below applies to NELK 4.0.0 and above Linux source tree.}}


The files <code>arch/arm/mach-omap2/board-naon.c</code> and <code>drivers/spi/omap2_mcspi.c</code> must be modified according to the following patch:

<diff>
diff --git a/arch/arm/mach-omap2/board-naon.c b/arch/arm/mach-omap2/board-naon.c
index 683af8e..e9d5023 100644
--- a/arch/arm/mach-omap2/board-naon.c
+++ b/arch/arm/mach-omap2/board-naon.c
@@ -794,6 +794,21 @@ struct spi_board_info __initdata naon_spi_slave_info[] = {
 		.chip_select	= 0,
 	},
 #endif
+
+        {
+            .modalias = "spidev",
+            .mode=SPI_MODE_0,
+            .max_speed_hz = 2000000,     /* max spiclock (SCK) speed in HZ */
+            .bus_num = 2,
+            .chip_select = 1,
+        },
+        {
+            .modalias = "spidev",
+            .mode=SPI_MODE_0,
+            .max_speed_hz = 2000000,     /* max spiclock (SCK) speed in HZ */
+            .bus_num = 4,
+            .chip_select = 1,
+        },
 };
 
 void __init naon_spi_init(void)
diff --git a/drivers/spi/omap2_mcspi.c b/drivers/spi/omap2_mcspi.c
index 06f586e..848a8e7 100644
--- a/drivers/spi/omap2_mcspi.c
+++ b/drivers/spi/omap2_mcspi.c
@@ -1182,7 +1182,7 @@ static int __init omap2_mcspi_probe(struct platform_device *pdev)
 	case 4:
 		rxdma_id = spi4_rxdma_id;
 		txdma_id = spi4_txdma_id;
-		num_chipselect = 1;
+		num_chipselect = 2;
 		break;
 #endif
 	default:
</diff>

Please note that SPI bus_num values to be used into the naon_spi_slave_info are:

* SPI1: .bus_num = 2
* SPI3: .bus_num = 4


The kernel must be rebuilt to make these modifications effective.