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Date: Mon, 11 Nov 2013 17:18:29 +0200
From: Grygorii Strashko <grygorii.strashko@...com>
To: Prabhakar Lad <prabhakar.csengg@...il.com>,
Sekhar Nori <nsekhar@...com>,
Linus Walleij <linus.walleij@...aro.org>
CC: LKML <linux-kernel@...r.kernel.org>,
DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
LAK <linux-arm-kernel@...ts.infradead.org>,
<linux-gpio@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-doc@...r.kernel.org>, Rob Herring <rob.herring@...xeda.com>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Stephen Warren <swarren@...dotorg.org>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Rob Landley <rob@...dley.net>,
Grant Likely <grant.likely@...aro.org>
Subject: Re: [PATCH v5 5/7] gpio: davinci: add OF support
On 11/08/2013 12:11 PM, Prabhakar Lad wrote:
> From: KV Sujith <sujithkv@...com>
>
> This patch adds OF parser support for davinci gpio
> driver and also appropriate documentation in gpio-davinci.txt
> located at Documentation/devicetree/bindings/gpio/.
>
> Signed-off-by: KV Sujith <sujithkv@...com>
> Signed-off-by: Philip Avinash <avinashphilip@...com>
> [prabhakar.csengg@...il.com: simplified the OF code, removed
> unnecessary DT property and also simplified
> the commit message]
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> ---
> .../devicetree/bindings/gpio/gpio-davinci.txt | 39 ++++++++++++++
> drivers/gpio/gpio-davinci.c | 54 ++++++++++++++++++--
> 2 files changed, 90 insertions(+), 3 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/gpio/gpio-davinci.txt
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-davinci.txt b/Documentation/devicetree/bindings/gpio/gpio-davinci.txt
> new file mode 100644
> index 0000000..d677bbe
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/gpio-davinci.txt
> @@ -0,0 +1,39 @@
> +Davinci GPIO controller bindings
> +
> +Required Properties:
> +- compatible: should be "ti,dm6441-gpio"
> +
> +- reg: Physical base address of the controller and the size of memory mapped
> + registers.
> +
> +- gpio-controller : Marks the device node as a gpio controller.
> +
> +- interrupt-parent: phandle of the parent interrupt controller.
> +
> +- interrupts: Array of GPIO interrupt number. Only banked or unbanked IRQs are
> + supported at a time.
> +
> +- ti,ngpio: The number of GPIO pins supported.
> +
> +- ti,davinci-gpio-unbanked: The number of GPIOs that have an individual interrupt
> + line to processor.
> +
> +The GPIO controller also acts as an interrupt controller. It uses the default
> +two cells specifier as described in Documentation/devicetree/bindings/
> +interrupt-controller/interrupts.txt.
> +
> +Example:
> +
> +gpio: gpio@...6000 {
> + compatible = "ti,dm6441-gpio";
> + gpio-controller;
> + reg = <0x226000 0x1000>;
> + interrupt-parent = <&intc>;
> + interrupts = <42 IRQ_TYPE_EDGE_BOTH 43 IRQ_TYPE_EDGE_BOTH
> + 44 IRQ_TYPE_EDGE_BOTH 45 IRQ_TYPE_EDGE_BOTH
> + 46 IRQ_TYPE_EDGE_BOTH 47 IRQ_TYPE_EDGE_BOTH
> + 48 IRQ_TYPE_EDGE_BOTH 49 IRQ_TYPE_EDGE_BOTH
> + 50 IRQ_TYPE_EDGE_BOTH>;
> + ti,ngpio = <144>;
> + ti,davinci-gpio-unbanked = <0>;
> +};
> diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
> index b149239..ed04835 100644
> --- a/drivers/gpio/gpio-davinci.c
> +++ b/drivers/gpio/gpio-davinci.c
> @@ -17,6 +17,9 @@
> #include <linux/io.h>
> #include <linux/irq.h>
> #include <linux/irqdomain.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> #include <linux/platform_device.h>
> #include <linux/platform_data/gpio-davinci.h>
>
> @@ -134,6 +137,40 @@ davinci_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
> writel((1 << offset), value ? &g->set_data : &g->clr_data);
> }
>
> +static struct davinci_gpio_platform_data *
> +davinci_gpio_get_pdata(struct platform_device *pdev)
Minor: usually such functions have "_of" in their names:
davinci_gpio_of_get_pdata()
> +{
> + struct device_node *dn = pdev->dev.of_node;
> + struct davinci_gpio_platform_data *pdata;
> + int ret;
> + u32 val;
> +
> + if (!IS_ENABLED(CONFIG_OF) || !pdev->dev.of_node)
> + return pdev->dev.platform_data;
> +
> + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> + if (!pdata)
> + return NULL;
> +
> + ret = of_property_read_u32(dn, "ti,ngpio", &val);
> + if (ret)
> + goto of_err;
> +
> + pdata->ngpio = val;
> +
> + ret = of_property_read_u32(dn, "ti,davinci-gpio-unbanked", &val);
> + if (ret)
> + goto of_err;
> +
> + pdata->gpio_unbanked = val;
> +
> + return pdata;
> +
> +of_err:
> + dev_err(&pdev->dev, "Populating pdata from DT failed: err %d\n", ret);
> + return NULL;
> +}
> +
> static int davinci_gpio_probe(struct platform_device *pdev)
> {
> int i, base;
> @@ -144,12 +181,14 @@ static int davinci_gpio_probe(struct platform_device *pdev)
> struct device *dev = &pdev->dev;
> struct resource *res;
>
> - pdata = dev->platform_data;
> + pdata = davinci_gpio_get_pdata(pdev);
> if (!pdata) {
> dev_err(dev, "No platform data found\n");
> return -EINVAL;
> }
>
> + dev->platform_data = pdata;
> +
Pls, add following code to GPIO chip initialization:
@@ -233,6 +245,9 @@ static int davinci_gpio_probe(struct platform_device *pdev)
chips[i].chip.ngpio = ngpio - base;
if (chips[i].chip.ngpio > 32)
chips[i].chip.ngpio = 32;
+#ifdef CONFIG_OF_GPIO
+ chips[i].chip.of_node = dev->of_node;
+#endif
> /*
> * The gpio banks conceptually expose a segmented bitmap,
> * and "ngpio" is one more than the largest zero-based
> @@ -496,11 +535,20 @@ done:
> return 0;
> }
>
> +#if IS_ENABLED(CONFIG_OF)
> +static const struct of_device_id davinci_gpio_ids[] = {
> + { .compatible = "ti,dm6441-gpio", },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, davinci_gpio_ids);
> +#endif
> +
> static struct platform_driver davinci_gpio_driver = {
> .probe = davinci_gpio_probe,
> .driver = {
> - .name = "davinci_gpio",
> - .owner = THIS_MODULE,
> + .name = "davinci_gpio",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(davinci_gpio_ids),
> },
> };
>
>
Regards,
- grygorii
--
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