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>
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@ -24,6 +24,8 @@
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#include <linux/gpio.h>
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#include <linux/gpio/consumer.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <asm/irq.h>
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@ -137,12 +139,15 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
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struct resource *res;
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struct i2c_pca9564_pf_platform_data *platform_data =
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dev_get_platdata(&pdev->dev);
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struct device_node *np = pdev->dev.of_node;
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int ret = 0;
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int irq;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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irq = platform_get_irq(pdev, 0);
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/* If irq is 0, we do polling. */
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if (irq < 0)
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irq = 0;
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if (res == NULL) {
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ret = -ENODEV;
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@ -178,6 +183,7 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
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(unsigned long) res->start);
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i2c->adap.algo_data = &i2c->algo_data;
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i2c->adap.dev.parent = &pdev->dev;
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i2c->adap.dev.of_node = np;
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if (platform_data) {
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i2c->adap.timeout = platform_data->timeout;
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@ -196,6 +202,15 @@ static int i2c_pca_pf_probe(struct platform_device *pdev)
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i2c->gpio = NULL;
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}
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}
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} else if (np) {
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i2c->adap.timeout = HZ;
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i2c->gpio = devm_gpiod_get_optional(&pdev->dev, "reset-gpios", GPIOD_OUT_LOW);
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if (IS_ERR(i2c->gpio)) {
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ret = PTR_ERR(i2c->gpio);
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goto e_reqirq;
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}
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of_property_read_u32_index(np, "clock-frequency", 0,
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&i2c->algo_data.i2c_clock);
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} else {
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i2c->adap.timeout = HZ;
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i2c->algo_data.i2c_clock = 59000;
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@ -270,11 +285,21 @@ static int i2c_pca_pf_remove(struct platform_device *pdev)
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id i2c_pca_of_match_table[] = {
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{ .compatible = "nxp,pca9564" },
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{ .compatible = "nxp,pca9665" },
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{},
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};
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MODULE_DEVICE_TABLE(of, i2c_pca_of_match_table);
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#endif
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static struct platform_driver i2c_pca_pf_driver = {
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.probe = i2c_pca_pf_probe,
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.remove = i2c_pca_pf_remove,
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.driver = {
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.name = "i2c-pca-platform",
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.of_match_table = of_match_ptr(i2c_pca_of_match_table),
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},
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};
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