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i2c: pca-platform: add devicetree awareness 

Allow devices that use this driver to be registered via a
devicetree.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
[wsa: fixed leakage when registering GPIO failed]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
hifive-unleashed-5.1
Chris Packham 2017-06-26 12:44:32 +12:00 committed by Wolfram Sang
parent 4cc7229daa
commit 0e8ce93bdc
1 changed files with 25 additions and 0 deletions
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25
drivers/i2c/busses/i2c-pca-platform.c
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@ -24,6 +24,8 @@
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <asm/irq.h>
@ -137,12 +139,15 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
struct resource *res;
struct i2c_pca9564_pf_platform_data *platform_data =
dev_get_platdata(&pdev->dev);
struct device_node *np = pdev->dev.of_node;
int ret = 0;
int irq;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
/* If irq is 0, we do polling. */
if (irq < 0)
irq = 0;
if (res == NULL) {
ret = -ENODEV;
@ -178,6 +183,7 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
(unsigned long) res->start);
i2c->adap.algo_data = &i2c->algo_data;
i2c->adap.dev.parent = &pdev->dev;
i2c->adap.dev.of_node = np;
if (platform_data) {
i2c->adap.timeout = platform_data->timeout;
@ -196,6 +202,15 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
i2c->gpio = NULL;
}
}
} else if (np) {
i2c->adap.timeout = HZ;
i2c->gpio = devm_gpiod_get_optional(&pdev->dev, "reset-gpios", GPIOD_OUT_LOW);
if (IS_ERR(i2c->gpio)) {
ret = PTR_ERR(i2c->gpio);
goto e_reqirq;
}
of_property_read_u32_index(np, "clock-frequency", 0,
&i2c->algo_data.i2c_clock);
} else {
i2c->adap.timeout = HZ;
i2c->algo_data.i2c_clock = 59000;
@ -270,11 +285,21 @@ static int i2c_pca_pf_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id i2c_pca_of_match_table[] = {
{ .compatible = "nxp,pca9564" },
{ .compatible = "nxp,pca9665" },
{},
};
MODULE_DEVICE_TABLE(of, i2c_pca_of_match_table);
#endif
static struct platform_driver i2c_pca_pf_driver = {
.probe = i2c_pca_pf_probe,
.remove = i2c_pca_pf_remove,
.driver = {
.name = "i2c-pca-platform",
.of_match_table = of_match_ptr(i2c_pca_of_match_table),
},
};