diff options
author | Magnus Damm <damm@opensource.se> | 2013-02-26 22:26:23 +0900 |
---|---|---|
committer | Grant Likely <grant.likely@secretlab.ca> | 2013-03-06 09:12:26 +0800 |
commit | 753c5983ddd38022a680a36f5d66b23b185c9b62 (patch) | |
tree | 3caf63dd7f8579a0eda026edd1d4cbb5e57d6aa0 /drivers/gpio | |
parent | 8d4c277e185c31359cf70573d8b0351fb7dd0dfe (diff) | |
download | op-kernel-dev-753c5983ddd38022a680a36f5d66b23b185c9b62.zip op-kernel-dev-753c5983ddd38022a680a36f5d66b23b185c9b62.tar.gz |
gpio/em: Add Device Tree support
Update the Emma Mobile GPIO driver to add DT support.
The patch simply adds a two-cell xlate function and
updates the probe code to allow configuration via DT
using the "ngpios" property plus OF id in the same
style as gpio-mvebu.c. The code is also adjusted to
use postcore_initcall() to force early setup.
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/gpio')
-rw-r--r-- | drivers/gpio/gpio-em.c | 45 |
1 files changed, 42 insertions, 3 deletions
diff --git a/drivers/gpio/gpio-em.c b/drivers/gpio/gpio-em.c index deca78f..d053697 100644 --- a/drivers/gpio/gpio-em.c +++ b/drivers/gpio/gpio-em.c @@ -231,10 +231,12 @@ static int em_gio_irq_domain_map(struct irq_domain *h, unsigned int virq, static struct irq_domain_ops em_gio_irq_domain_ops = { .map = em_gio_irq_domain_map, + .xlate = irq_domain_xlate_twocell, }; static int em_gio_probe(struct platform_device *pdev) { + struct gpio_em_config pdata_dt; struct gpio_em_config *pdata = pdev->dev.platform_data; struct em_gio_priv *p; struct resource *io[2], *irq[2]; @@ -259,8 +261,8 @@ static int em_gio_probe(struct platform_device *pdev) irq[0] = platform_get_resource(pdev, IORESOURCE_IRQ, 0); irq[1] = platform_get_resource(pdev, IORESOURCE_IRQ, 1); - if (!io[0] || !io[1] || !irq[0] || !irq[1] || !pdata) { - dev_err(&pdev->dev, "missing IRQ, IOMEM or configuration\n"); + if (!io[0] || !io[1] || !irq[0] || !irq[1]) { + dev_err(&pdev->dev, "missing IRQ or IOMEM\n"); ret = -EINVAL; goto err1; } @@ -279,6 +281,25 @@ static int em_gio_probe(struct platform_device *pdev) goto err2; } + if (!pdata) { + memset(&pdata_dt, 0, sizeof(pdata_dt)); + pdata = &pdata_dt; + + if (of_property_read_u32(pdev->dev.of_node, "ngpios", + &pdata->number_of_pins)) { + dev_err(&pdev->dev, "Missing ngpios OF property\n"); + ret = -EINVAL; + goto err3; + } + + ret = of_alias_get_id(pdev->dev.of_node, "gpio"); + if (ret < 0) { + dev_err(&pdev->dev, "Couldn't get OF id\n"); + goto err3; + } + pdata->gpio_base = ret * 32; /* 32 GPIOs per instance */ + } + gpio_chip = &p->gpio_chip; gpio_chip->direction_input = em_gio_direction_input; gpio_chip->get = em_gio_get; @@ -366,15 +387,33 @@ static int em_gio_remove(struct platform_device *pdev) return 0; } +static const struct of_device_id em_gio_dt_ids[] = { + { .compatible = "renesas,em-gio", }, + {}, +}; +MODULE_DEVICE_TABLE(of, em_gio_dt_ids); + static struct platform_driver em_gio_device_driver = { .probe = em_gio_probe, .remove = em_gio_remove, .driver = { .name = "em_gio", + .of_match_table = em_gio_dt_ids, + .owner = THIS_MODULE, } }; -module_platform_driver(em_gio_device_driver); +static int __init em_gio_init(void) +{ + return platform_driver_register(&em_gio_device_driver); +} +postcore_initcall(em_gio_init); + +static void __exit em_gio_exit(void) +{ + platform_driver_unregister(&em_gio_device_driver); +} +module_exit(em_gio_exit); MODULE_AUTHOR("Magnus Damm"); MODULE_DESCRIPTION("Renesas Emma Mobile GIO Driver"); |