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| author | Sekhar Nori <nsekhar@ti.com> | 2009-10-21 21:18:21 +0530 |
|---|---|---|
| committer | Kevin Hilman <khilman@deeprootsystems.com> | 2009-11-25 10:21:35 -0800 |
| commit | b5ebe4e198e595cad412a9de2d7b253693545d30 (patch) | |
| tree | 70723cb07fe43cfb074e9a84dffba32db5d4c4c5 /arch/arm/mach-davinci | |
| parent | 77316f0575264c56fb0c8f241b946a91e3a00602 (diff) | |
| download | lwn-b5ebe4e198e595cad412a9de2d7b253693545d30.tar.gz lwn-b5ebe4e198e595cad412a9de2d7b253693545d30.zip | |
davinci: DA830/OMAP-L137 EVM: do not configure NAND on UI card when MMC/SD is selected
On the DA830, AEMIF and MMC/SD pins are shared. On the EVM, when
the mux_mode signal is low MMC/SD works and when mux_mode signal
is high, NAND works.
When MMC/SD driver is configured in the kernel, do not let NAND
get registered and drive mux_mode high. Instead, print a warning
for user to understand why the platform device for NAND did not
get registered.
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch/arm/mach-davinci')
| -rw-r--r-- | arch/arm/mach-davinci/board-da830-evm.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c index e7e97c90d4d0..537a048c84be 100644 --- a/arch/arm/mach-davinci/board-da830-evm.c +++ b/arch/arm/mach-davinci/board-da830-evm.c @@ -282,6 +282,12 @@ static const short da830_evm_emif25_pins[] = { -1 }; +#if defined(CONFIG_MMC_DAVINCI) || defined(CONFIG_MMC_DAVINCI_MODULE) +#define HAS_MMC 1 +#else +#define HAS_MMC 0 +#endif + #ifdef CONFIG_DA830_UI_NAND static struct mtd_partition da830_evm_nand_partitions[] = { /* bootloader (U-Boot, etc) in first sector */ @@ -377,6 +383,13 @@ static inline void da830_evm_init_nand(int mux_mode) { int ret; + if (HAS_MMC) { + pr_warning("WARNING: both MMC/SD and NAND are " + "enabled, but they share AEMIF pins.\n" + "\tDisable MMC/SD for NAND support.\n"); + return; + } + ret = da8xx_pinmux_setup(da830_evm_emif25_pins); if (ret) pr_warning("da830_evm_init: emif25 mux setup failed: %d\n", @@ -425,6 +438,9 @@ static int da830_evm_ui_expander_setup(struct i2c_client *client, int gpio, { gpio_request(gpio + 6, "UI MUX_MODE"); + /* Drive mux mode low to match the default without UI card */ + gpio_direction_output(gpio + 6, 0); + da830_evm_init_lcdc(gpio + 6); da830_evm_init_nand(gpio + 6); |