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memory: omap-gpmc: Reserve WAITPIN if needed for WAIT monitoring

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If the device attached to GPMC wants to use the WAIT pin
for WAIT monitoring then we reserve it internally for
exclusive use.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Roger Quadros 2015-08-06 13:21:40 +03:00
parent d2d00862df
commit 210325f0f4
1 changed files with 22 additions and 2 deletions
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24
drivers/memory/omap-gpmc.c
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@ -1911,6 +1911,8 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
const char *name;
int ret, cs;
u32 val;
struct gpio_desc *waitpin_desc = NULL;
struct gpmc_device *gpmc = platform_get_drvdata(pdev);
if (of_property_read_u32(child, "reg", &cs) < 0) {
dev_err(&pdev->dev, "%s has no 'reg' property\n",
@ -2020,16 +2022,30 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
goto err;
}
/* Reserve wait pin if it is required and valid */
if (gpmc_s.wait_on_read || gpmc_s.wait_on_write) {
unsigned int wait_pin = gpmc_s.wait_pin;
waitpin_desc = gpiochip_request_own_desc(&gpmc->gpio_chip,
wait_pin, "WAITPIN");
if (IS_ERR(waitpin_desc)) {
dev_err(&pdev->dev, "invalid wait-pin: %d\n", wait_pin);
ret = PTR_ERR(waitpin_desc);
goto err;
}
}
gpmc_cs_show_timings(cs, "before gpmc_cs_program_settings");
ret = gpmc_cs_program_settings(cs, &gpmc_s);
if (ret < 0)
goto err;
goto err_cs;
ret = gpmc_cs_set_timings(cs, &gpmc_t, &gpmc_s);
if (ret) {
dev_err(&pdev->dev, "failed to set gpmc timings for: %s\n",
child->name);
goto err;
goto err_cs;
}
/* Clear limited address i.e. enable A26-A11 */
@ -2060,6 +2076,10 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
dev_err(&pdev->dev, "failed to create gpmc child %s\n", child->name);
ret = -ENODEV;
err_cs:
if (waitpin_desc)
gpiochip_free_own_desc(waitpin_desc);
err:
gpmc_cs_free(cs);