TQ2440之kernel---spi驱动分析2内核修改

arch/arm/mach-s3c2440/mach-tq2440.c

--- a/arch/arm/mach-s3c2440/mach-tq2440.c
+++ b/arch/arm/mach-s3c2440/mach-tq2440.c
@@ -46,6 +46,9 @@

 #include <sound/s3c24xx_uda134x.h>

+#include <../mach-s3c2410/include/mach/spi.h>
+#include <linux/spi/spi.h>
+
 static struct map_desc tq2440_iodesc[] __initdata = {
 };

@@ -318,6 +321,22 @@ static struct platform_device s3c_device_uda134x = {
        }
 };

+static struct spi_board_info s3c2410_spi0_board[] = {
+ [0] = {
+ .modalias = "spidev",
+ .bus_num = 0,
+ .chip_select = 0,
+ .irq = IRQ_EINT10,
+ .max_speed_hz = 500*1000,
+ },
+};
+
+static struct s3c2410_spi_info s3c2410_spi0_platdata = {
+ .pin_cs = S3C2410_GPG2,
+ .num_cs = 1,
+ .bus_num = 0,
+};
+
 static struct platform_device *tq2440_devices[] __initdata = {
        &s3c_device_usb,
        &s3c_device_lcd,
@@ -330,6 +349,7 @@ static struct platform_device *tq2440_devices[] __initdata = {
 #endif
        &s3c_device_usbgadget,
        &s3c_device_uda134x,
        + &s3c_device_spi0,
 };

 static void __init tq2440_map_io(void)
@@ -346,6 +366,8 @@ static void __init tq2440_machine_init(void)

        platform_add_devices(tq2440_devices, ARRAY_SIZE(tq2440_devices));
        EmbedSky_machine_init();
+ s3c_device_spi0.dev.platform_data= &s3c2410_spi0_platdata;
+ spi_register_board_info(s3c2410_spi0_board, ARRAY_SIZE(s3c2410_spi0_board));
        s3c2410_gpio_setpin(S3C2410_GPG12, 0);
        s3c2410_gpio_cfgpin(S3C2410_GPG12, S3C2410_GPIO_OUTPUT);
        s3c24xx_udc_set_platdata(&EmbedSky_udc_cfg);

所有的改动都是在arch/arm/mach-s3c2440/mach-tq2440.c中
1. 添加include

#include <../mach-s3c2410/include/mach/spi.h>
#include <linux/spi/spi.h>

2.添加board_info

static struct spi_board_info s3c2410_spi0_board[] = {
        [0] = {
                 .modalias = "spidev",
                .bus_num = 0,
                .chip_select = 0,
                .irq = IRQ_EINT10,
                .max_speed_hz = 500*1000,
        },
};

static struct s3c2410_spi_info s3c2410_spi0_platdata = {
        .pin_cs = S3C2410_GPG2,
        .num_cs = 1,
        .bus_num = 0,
};

并在tq2440_machine_init中将board_info赋值

static void __init tq2440_machine_init(void)
{
    ....
    s3c_device_spi0.dev.platform_data= &s3c2410_spi0_platdata;
    spi_register_board_info(s3c2410_spi0_board, ARRAY_SIZE(s3c2410_spi0_board));
    .....
}

3.最后添加spi的设备
因为在./arch/arm/plat-s3c24xx/devs.c中己经有了spi0的platform_device，
这儿只需要添加到设备列表中即可

static struct platform_device *tq2440_devices[] __initdata = {
    &s3c_device_spi0,
};

4. 内核配置: make menuconfig

Device Drivers --->
      [*] SPI support --->
         *** SPI Master Controller Drivers ***
         -*- Utilities for Bitbanging SPI masters --> SPI_BITBANG
         < > GPIO-based bitbanging SPI Master --> SPI_GPIO not set
         <*> Samsung S3C24XX series SPI --> SPI_S3C24XX
         <*> Samsung S3C24XX series SPI by GPIO --> SPI_S3C24XX_GPIO
         *** SPI Protocol Masters ***
         <*> User mode SPI device driver support --> SPI_SPIDEV
         < > Infineon TLE62X0 (for power switching)

1-3是添加spi的设备，4步是添加spi的driver