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Date: Mon, 17 Dec 2012 15:51:53 +0000
From: Mark Rutland <mark.rutland@....com>
To: Roland Stigge <stigge@...com.de>
Cc: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"w.sang@...gutronix.de" <w.sang@...gutronix.de>,
"jbe@...gutronix.de" <jbe@...gutronix.de>,
"plagnioj@...osoft.com" <plagnioj@...osoft.com>,
"highguy@...il.com" <highguy@...il.com>,
"broonie@...nsource.wolfsonmicro.com"
<broonie@...nsource.wolfsonmicro.com>,
"daniel-gl@....net" <daniel-gl@....net>,
"rmallon@...il.com" <rmallon@...il.com>, "sr@...x.de" <sr@...x.de>,
"wg@...ndegger.com" <wg@...ndegger.com>
Subject: Re: [PATCH RESEND 5/6 v10] gpio: Add device tree support to block
GPIO API
Hi,
I have a few comments on the parsing code.
On Fri, Dec 14, 2012 at 02:26:24PM +0000, Roland Stigge wrote:
> This patch adds device tree support to the block GPIO API.
>
> Signed-off-by: Roland Stigge <stigge@...com.de>
>
> ---
> Documentation/devicetree/bindings/gpio/gpio-block.txt | 36 +++++++
> drivers/gpio/Makefile | 1
> drivers/gpio/gpioblock-of.c | 84 ++++++++++++++++++
> 3 files changed, 121 insertions(+)
>
> --- /dev/null
> +++ linux-2.6/Documentation/devicetree/bindings/gpio/gpio-block.txt
> @@ -0,0 +1,36 @@
> +Block GPIO definition
> +=====================
> +
> +This binding specifies arbitrary blocks of gpios, combining gpios from one or
> +more GPIO controllers together, to form a word for r/w access.
> +
> +Required property:
> +- compatible: must be "linux,gpio-block"
> +
> +Required subnodes:
> +- the name will be the registered name of the block
> +- property "gpios" is a list of gpios for the respective block
> +
> +Example:
> +
> + blockgpio {
> + compatible = "linux,gpio-block";
> +
> + block0 {
> + gpios = <&gpio 3 0 0>,
> + <&gpio 3 1 0>;
> + };
> + block1 {
> + gpios = <&gpio 4 1 0>,
> + <&gpio 4 3 0>,
> + <&gpio 4 2 0>,
> + <&gpio 4 4 0>,
> + <&gpio 4 5 0>,
> + <&gpio 4 6 0>,
> + <&gpio 4 7 0>,
> + <&gpio 4 8 0>,
> + <&gpio 4 9 0>,
> + <&gpio 4 10 0>,
> + <&gpio 4 19 0>;
> + };
> + };
> --- linux-2.6.orig/drivers/gpio/Makefile
> +++ linux-2.6/drivers/gpio/Makefile
> @@ -4,6 +4,7 @@ ccflags-$(CONFIG_DEBUG_GPIO) += -DDEBUG
>
> obj-$(CONFIG_GPIOLIB) += gpiolib.o devres.o
> obj-$(CONFIG_OF_GPIO) += gpiolib-of.o
> +obj-$(CONFIG_OF_GPIO) += gpioblock-of.o
>
> # Device drivers. Generally keep list sorted alphabetically
> obj-$(CONFIG_GPIO_GENERIC) += gpio-generic.o
> --- /dev/null
> +++ linux-2.6/drivers/gpio/gpioblock-of.c
> @@ -0,0 +1,84 @@
> +/*
> + * OF implementation for Block GPIO
> + *
> + * Copyright (C) 2012 Roland Stigge <stigge@...com.de>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/gpio.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/err.h>
> +
> +static int __devinit gpioblock_of_probe(struct platform_device *pdev)
> +{
> + struct device_node *block;
> + unsigned *gpios;
> + int ngpio;
> + int ret;
> + struct gpio_block *gb;
> +
> + for_each_available_child_of_node(pdev->dev.of_node, block) {
> + int i;
> +
> + ngpio = of_gpio_count(block);
> + gpios = kzalloc(ngpio * sizeof(*gpios), GFP_KERNEL);
What if the block node is malformed? ngpio might be -ENOENT or -EINVAL.
> + if (!gpios)
> + return -ENOMEM;
> + for (i = 0; i < ngpio; i++) {
> + ret = of_get_gpio(block, i);
> + if (ret < 0)
> + return ret; /* expect -EPROBE_DEFER */
> + gpios[i] = ret;
> + }
> + gb = gpio_block_create(gpios, ngpio, block->name);
> + if (IS_ERR(gb)) {
> + dev_err(&pdev->dev,
> + "Error creating GPIO block from device tree\n");
> + return PTR_ERR(gb);
Won't this leak the memory for the gpios object we kzalloc'd earlier?
> + }
> + ret = gpio_block_register(gb);
> + if (ret < 0) {
> + gpio_block_free(gb);
> + return ret;
Same here.
> + }
> + kfree(gpios);
> + dev_info(&pdev->dev, "Registered gpio block %s: %d gpios\n",
> + block->name, ngpio);
Any of the returns in this block will leave the block node's refcount
incremented.
> + }
> + return 0;
> +}
> +
> +#ifdef CONFIG_OF
> +static struct of_device_id gpioblock_of_match[] __devinitdata = {
> + { .compatible = "linux,gpio-block", },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, gpioblock_of_match);
> +#endif
> +
> +static struct platform_driver gpioblock_of_driver = {
> + .driver = {
> + .name = "gpio-block",
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(gpioblock_of_match),
> +
> + },
> + .probe = gpioblock_of_probe,
> +};
> +
> +module_platform_driver(gpioblock_of_driver);
> +
> +MODULE_DESCRIPTION("GPIO Block driver");
> +MODULE_AUTHOR("Roland Stigge <stigge@...com.de>");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:gpioblock-of");
>
Thanks,
Mark.
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