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mmc: omap_hsmmc: support deferred probing for GPIOs 

If the CD/WP-GPIOs are not provided by the SoC's GPIO controller,
we need to handle the case where omap_hsmmc is probed earlier than
the GPIO controller chosen in the device tree.

Fix this by checking the return value of of_get_named_gpio against
-EPROBE_DEFER and passing it through to the probe function.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Acked-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Jan Luebbe 2013-01-30 10:07:17 +01:00 committed by Chris Ball
parent 0aacd23ff2
commit dc642c28d4
1 changed files with 12 additions and 2 deletions
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14
drivers/mmc/host/omap_hsmmc.c
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@ -1717,6 +1717,12 @@ static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
struct omap_mmc_platform_data *pdata;
struct device_node *np = dev->of_node;
u32 bus_width, max_freq;
int cd_gpio, wp_gpio;
cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
if (cd_gpio == -EPROBE_DEFER || wp_gpio == -EPROBE_DEFER)
return ERR_PTR(-EPROBE_DEFER);
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
@ -1727,8 +1733,8 @@ static struct omap_mmc_platform_data *of_get_hsmmc_pdata(struct device *dev)
/* This driver only supports 1 slot */
pdata->nr_slots = 1;
pdata->slots[0].switch_pin = of_get_named_gpio(np, "cd-gpios", 0);
pdata->slots[0].gpio_wp = of_get_named_gpio(np, "wp-gpios", 0);
pdata->slots[0].switch_pin = cd_gpio;
pdata->slots[0].gpio_wp = wp_gpio;
if (of_find_property(np, "ti,non-removable", NULL)) {
pdata->slots[0].nonremovable = true;
@ -1774,6 +1780,10 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
match = of_match_device(of_match_ptr(omap_mmc_of_match), &pdev->dev);
if (match) {
pdata = of_get_hsmmc_pdata(&pdev->dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
if (match->data) {
const u16 *offsetp = match->data;
pdata->reg_offset = *offsetp;