gpio: davinci: add OF support
This patch adds OF parser support for davinci gpio driver and also appropriate documentation in gpio-davinci.txt located at Documentation/devicetree/bindings/gpio/. Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Rob Herring <rob.herring@calxeda.com> Signed-off-by: KV Sujith <sujithkv@ti.com> Signed-off-by: Philip Avinash <avinashphilip@ti.com> [prabhakar.csengg@gmail.com: simplified the OF code, removed unnecessary DT property and also simplified the commit message] Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
This commit is contained in:
KV Sujith
Sekhar Nori
parent
d3422a18db
commit
c770844c3e
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@ -0,0 +1,41 @@
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Davinci GPIO controller bindings
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Required Properties:
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- compatible: should be "ti,dm6441-gpio"
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- reg: Physical base address of the controller and the size of memory mapped
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registers.
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- gpio-controller : Marks the device node as a gpio controller.
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- interrupt-parent: phandle of the parent interrupt controller.
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- interrupts: Array of GPIO interrupt number. Only banked or unbanked IRQs are
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supported at a time.
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- ti,ngpio: The number of GPIO pins supported.
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- ti,davinci-gpio-unbanked: The number of GPIOs that have an individual interrupt
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line to processor.
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The GPIO controller also acts as an interrupt controller. It uses the default
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two cells specifier as described in Documentation/devicetree/bindings/
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interrupt-controller/interrupts.txt.
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Example:
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gpio: gpio@1e26000 {
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compatible = "ti,dm6441-gpio";
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gpio-controller;
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reg = <0x226000 0x1000>;
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interrupt-parent = <&intc>;
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interrupts = <42 IRQ_TYPE_EDGE_BOTH 43 IRQ_TYPE_EDGE_BOTH
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44 IRQ_TYPE_EDGE_BOTH 45 IRQ_TYPE_EDGE_BOTH
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46 IRQ_TYPE_EDGE_BOTH 47 IRQ_TYPE_EDGE_BOTH
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48 IRQ_TYPE_EDGE_BOTH 49 IRQ_TYPE_EDGE_BOTH
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50 IRQ_TYPE_EDGE_BOTH>;
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ti,ngpio = <144>;
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ti,davinci-gpio-unbanked = <0>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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@ -17,6 +17,9 @@
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/gpio-davinci.h>
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@ -134,6 +137,40 @@ davinci_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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writel_relaxed((1 << offset), value ? &g->set_data : &g->clr_data);
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}
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static struct davinci_gpio_platform_data *
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davinci_gpio_get_pdata(struct platform_device *pdev)
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{
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struct device_node *dn = pdev->dev.of_node;
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struct davinci_gpio_platform_data *pdata;
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int ret;
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u32 val;
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if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
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return pdev->dev.platform_data;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return NULL;
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ret = of_property_read_u32(dn, "ti,ngpio", &val);
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if (ret)
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goto of_err;
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pdata->ngpio = val;
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ret = of_property_read_u32(dn, "ti,davinci-gpio-unbanked", &val);
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if (ret)
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goto of_err;
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pdata->gpio_unbanked = val;
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return pdata;
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of_err:
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dev_err(&pdev->dev, "Populating pdata from DT failed: err %d\n", ret);
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return NULL;
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}
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static int davinci_gpio_probe(struct platform_device *pdev)
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{
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int i, base;
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@ -144,12 +181,14 @@ static int davinci_gpio_probe(struct platform_device *pdev)
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struct device *dev = &pdev->dev;
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struct resource *res;
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pdata = dev->platform_data;
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pdata = davinci_gpio_get_pdata(pdev);
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if (!pdata) {
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dev_err(dev, "No platform data found\n");
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return -EINVAL;
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}
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dev->platform_data = pdata;
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/*
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* The gpio banks conceptually expose a segmented bitmap,
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* and "ngpio" is one more than the largest zero-based
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@ -195,6 +234,9 @@ static int davinci_gpio_probe(struct platform_device *pdev)
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if (chips[i].chip.ngpio > 32)
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chips[i].chip.ngpio = 32;
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#ifdef CONFIG_OF_GPIO
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chips[i].chip.of_node = dev->of_node;
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#endif
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spin_lock_init(&chips[i].lock);
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regs = gpio2regs(base);
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@ -506,11 +548,20 @@ done:
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return 0;
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}
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#if IS_ENABLED(CONFIG_OF)
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static const struct of_device_id davinci_gpio_ids[] = {
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{ .compatible = "ti,dm6441-gpio", },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, davinci_gpio_ids);
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#endif
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static struct platform_driver davinci_gpio_driver = {
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.probe = davinci_gpio_probe,
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.driver = {
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.name = "davinci_gpio",
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.owner = THIS_MODULE,
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.name = "davinci_gpio",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(davinci_gpio_ids),
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},
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};
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