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davinci: DA830/OMAP-L137 EVM: use runtime detection for UI card

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This patch supports runtime detection of DA830 UI card and
eliminates the need for DA830_UI config option. Successful
probe of GPIO expander present on the UI card is used to
detect its presence. For this reason, GPIO_PCF857X is auto-
selected when DA830 EVM is configured. In case the UI card
is absent, the probe fails in reasonable time.

As a side effect this patch also gets rid of the voilation
of Documentation/SubmittingPatches section 2.2 in function
da830_evm_ui_expander_setup()

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Sekhar Nori 2009-10-21 21:18:20 +05:30 committed by Kevin Hilman
parent a0433ac30c
commit 77316f0575
2 changed files with 67 additions and 70 deletions
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17
arch/arm/mach-davinci/Kconfig
View File

@ -100,21 +100,18 @@ config MACH_DAVINCI_DA830_EVM
bool "TI DA830/OMAP-L137 Reference Platform"
default ARCH_DAVINCI_DA830
depends on ARCH_DAVINCI_DA830
select GPIO_PCF857X
help
Say Y here to select the TI DA830/OMAP-L137 Evaluation Module.
config DA830_UI
bool "DA830/OMAP-L137 UI (User Interface) board support"
depends on MACH_DAVINCI_DA830_EVM
help
Say Y here if you have the DA830/OMAP-L137 UI
(User Interface) board installed and you want to
enable the peripherals located on User Interface
board.
choice
prompt "Select DA830/OMAP-L137 UI board peripheral"
depends on DA830_UI
depends on MACH_DAVINCI_DA830_EVM
help
The presence of UI card on the DA830/OMAP-L137 EVM is detected
automatically based on successful probe of the I2C based GPIO
expander on that board. This option selected in this menu has
an effect only in case of a successful UI card detection.
config DA830_UI_LCD
bool "LCD"

120
arch/arm/mach-davinci/board-da830-evm.c
View File

@ -36,58 +36,6 @@
#define DA830_EMIF25_ASYNC_DATA_CE3_BASE 0x62000000
#define DA830_EMIF25_CONTROL_BASE 0x68000000
static struct at24_platform_data da830_evm_i2c_eeprom_info = {
.byte_len = SZ_256K / 8,
.page_size = 64,
.flags = AT24_FLAG_ADDR16,
.setup = davinci_get_mac_addr,
.context = (void *)0x7f00,
};
static int da830_evm_ui_expander_setup(struct i2c_client *client, int gpio,
unsigned ngpio, void *context)
{
gpio_request(gpio + 6, "MUX_MODE");
#ifdef CONFIG_DA830_UI_LCD
gpio_direction_output(gpio + 6, 0);
#else /* Must be NAND or NOR */
gpio_direction_output(gpio + 6, 1);
#endif
return 0;
}
static int da830_evm_ui_expander_teardown(struct i2c_client *client, int gpio,
unsigned ngpio, void *context)
{
gpio_free(gpio + 6);
return 0;
}
static struct pcf857x_platform_data da830_evm_ui_expander_info = {
.gpio_base = DAVINCI_N_GPIO,
.setup = da830_evm_ui_expander_setup,
.teardown = da830_evm_ui_expander_teardown,
};
static struct i2c_board_info __initdata da830_evm_i2c_devices[] = {
{
I2C_BOARD_INFO("24c256", 0x50),
.platform_data = &da830_evm_i2c_eeprom_info,
},
{
I2C_BOARD_INFO("tlv320aic3x", 0x18),
},
{
I2C_BOARD_INFO("pcf8574", 0x3f),
.platform_data = &da830_evm_ui_expander_info,
},
};
static struct davinci_i2c_platform_data da830_evm_i2c_0_pdata = {
.bus_freq = 100, /* kHz */
.bus_delay = 0, /* usec */
};
/*
* USB1 VBUS is controlled by GPIO1[15], over-current is reported on GPIO2[4].
*/
@ -425,7 +373,7 @@ static struct platform_device da830_evm_nand_device = {
.resource = da830_evm_nand_resources,
};
static inline void da830_evm_init_nand(void)
static inline void da830_evm_init_nand(int mux_mode)
{
int ret;
@ -437,13 +385,15 @@ static inline void da830_evm_init_nand(void)
ret = platform_device_register(&da830_evm_nand_device);
if (ret)
pr_warning("da830_evm_init: NAND device not registered.\n");
gpio_direction_output(mux_mode, 1);
}
#else
static inline void da830_evm_init_nand(void) { }
static inline void da830_evm_init_nand(int mux_mode) { }
#endif
#ifdef CONFIG_DA830_UI_LCD
static inline void da830_evm_init_lcdc(void)
static inline void da830_evm_init_lcdc(int mux_mode)
{
int ret;
@ -455,11 +405,65 @@ static inline void da830_evm_init_lcdc(void)
ret = da8xx_register_lcdc(&sharp_lcd035q3dg01_pdata);
if (ret)
pr_warning("da830_evm_init: lcd setup failed: %d\n", ret);
gpio_direction_output(mux_mode, 0);
}
#else
static inline void da830_evm_init_lcdc(void) { }
static inline void da830_evm_init_lcdc(int mux_mode) { }
#endif
static struct at24_platform_data da830_evm_i2c_eeprom_info = {
.byte_len = SZ_256K / 8,
.page_size = 64,
.flags = AT24_FLAG_ADDR16,
.setup = davinci_get_mac_addr,
.context = (void *)0x7f00,
};
static int da830_evm_ui_expander_setup(struct i2c_client *client, int gpio,
unsigned ngpio, void *context)
{
gpio_request(gpio + 6, "UI MUX_MODE");
da830_evm_init_lcdc(gpio + 6);
da830_evm_init_nand(gpio + 6);
return 0;
}
static int da830_evm_ui_expander_teardown(struct i2c_client *client, int gpio,
unsigned ngpio, void *context)
{
gpio_free(gpio + 6);
return 0;
}
static struct pcf857x_platform_data da830_evm_ui_expander_info = {
.gpio_base = DAVINCI_N_GPIO,
.setup = da830_evm_ui_expander_setup,
.teardown = da830_evm_ui_expander_teardown,
};
static struct i2c_board_info __initdata da830_evm_i2c_devices[] = {
{
I2C_BOARD_INFO("24c256", 0x50),
.platform_data = &da830_evm_i2c_eeprom_info,
},
{
I2C_BOARD_INFO("tlv320aic3x", 0x18),
},
{
I2C_BOARD_INFO("pcf8574", 0x3f),
.platform_data = &da830_evm_ui_expander_info,
},
};
static struct davinci_i2c_platform_data da830_evm_i2c_0_pdata = {
.bus_freq = 100, /* kHz */
.bus_delay = 0, /* usec */
};
static __init void da830_evm_init(void)
{
struct davinci_soc_info *soc_info = &davinci_soc_info;
@ -514,10 +518,6 @@ static __init void da830_evm_init(void)
da830_evm_init_mmc();
da830_evm_init_lcdc();
da830_evm_init_nand();
ret = da8xx_register_rtc();
if (ret)
pr_warning("da830_evm_init: rtc setup failed: %d\n", ret);