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mmc: davinci: Add support for set_power callback 

Some devices connected to the MMC bus are power controlled by external
means. For instance, an SDIO device may be powered down/up by an
external gpio line.

In order to avoid toggling power from within the MMC host driver, add a
set_power callback function, which will be called by set_ios upon
powering down/up.

Signed-off-by: Ido Yariv <ido@wizery.com>
CC: Chris Ball <cjb@laptop.org>
Acked-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
This commit is contained in:
Ido Yariv 2011-07-28 20:49:09 +00:00 committed by Sekhar Nori
parent 6836989c35
commit 4a9de8ad2c
2 changed files with 16 additions and 0 deletions
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3
arch/arm/mach-davinci/include/mach/mmc.h
View File

@ -12,6 +12,9 @@ struct davinci_mmc_config {
/* get_cd()/get_wp() may sleep */
int (*get_cd)(int module);
int (*get_ro)(int module);
void (*set_power)(int module, bool on);
/* wires == 0 is equivalent to wires == 4 (4-bit parallel) */
u8 wires;

13
drivers/mmc/host/davinci_mmc.c
View File

@ -807,12 +807,25 @@ static void calculate_clk_divider(struct mmc_host *mmc, struct mmc_ios *ios)
static void mmc_davinci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct mmc_davinci_host *host = mmc_priv(mmc);
struct platform_device *pdev = to_platform_device(mmc->parent);
struct davinci_mmc_config *config = pdev->dev.platform_data;
dev_dbg(mmc_dev(host->mmc),
"clock %dHz busmode %d powermode %d Vdd %04x\n",
ios->clock, ios->bus_mode, ios->power_mode,
ios->vdd);
switch (ios->power_mode) {
case MMC_POWER_OFF:
if (config && config->set_power)
config->set_power(pdev->id, false);
break;
case MMC_POWER_UP:
if (config && config->set_power)
config->set_power(pdev->id, true);
break;
}
switch (ios->bus_width) {
case MMC_BUS_WIDTH_8:
dev_dbg(mmc_dev(host->mmc), "Enabling 8 bit mode\n");