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448cf90513
GPIO library does copy the of_node from the parent device of the GPIO chip, there is no need to repeat this in the individual drivers. Remove these assignment all at once. For the details one may look into the of_gpio_dev_init() implementation. While at it, remove duplicate parent device assignment where it is the case. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-By: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/*
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* Driver for GE FPGA based GPIO
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*
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* Author: Martyn Welch <martyn.welch@ge.com>
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*
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* 2008 (c) GE Intelligent Platforms Embedded Systems, Inc.
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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/* TODO
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*
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* Configuration of output modes (totem-pole/open-drain)
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* Interrupt configuration - interrupts are always generated the FPGA relies on
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* the I/O interrupt controllers mask to stop them propergating
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*/
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/of_device.h>
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#include <linux/of_address.h>
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#include <linux/module.h>
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#include <linux/gpio/driver.h>
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#define GEF_GPIO_DIRECT 0x00
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#define GEF_GPIO_IN 0x04
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#define GEF_GPIO_OUT 0x08
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#define GEF_GPIO_TRIG 0x0C
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#define GEF_GPIO_POLAR_A 0x10
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#define GEF_GPIO_POLAR_B 0x14
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#define GEF_GPIO_INT_STAT 0x18
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#define GEF_GPIO_OVERRUN 0x1C
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#define GEF_GPIO_MODE 0x20
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static const struct of_device_id gef_gpio_ids[] = {
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{
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.compatible = "gef,sbc610-gpio",
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.data = (void *)19,
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}, {
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.compatible = "gef,sbc310-gpio",
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.data = (void *)6,
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}, {
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.compatible = "ge,imp3a-gpio",
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.data = (void *)16,
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},
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{ }
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};
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MODULE_DEVICE_TABLE(of, gef_gpio_ids);
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static int __init gef_gpio_probe(struct platform_device *pdev)
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{
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struct gpio_chip *gc;
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void __iomem *regs;
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int ret;
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gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
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if (!gc)
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return -ENOMEM;
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regs = of_iomap(pdev->dev.of_node, 0);
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if (!regs)
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return -ENOMEM;
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ret = bgpio_init(gc, &pdev->dev, 4, regs + GEF_GPIO_IN,
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regs + GEF_GPIO_OUT, NULL, NULL,
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regs + GEF_GPIO_DIRECT, BGPIOF_BIG_ENDIAN_BYTE_ORDER);
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if (ret) {
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dev_err(&pdev->dev, "bgpio_init failed\n");
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goto err0;
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}
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/* Setup pointers to chip functions */
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gc->label = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOF", pdev->dev.of_node);
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if (!gc->label) {
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ret = -ENOMEM;
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goto err0;
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}
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gc->base = -1;
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gc->ngpio = (u16)(uintptr_t)of_device_get_match_data(&pdev->dev);
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gc->of_gpio_n_cells = 2;
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/* This function adds a memory mapped GPIO chip */
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ret = devm_gpiochip_add_data(&pdev->dev, gc, NULL);
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if (ret)
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goto err0;
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return 0;
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err0:
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iounmap(regs);
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pr_err("%pOF: GPIO chip registration failed\n", pdev->dev.of_node);
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return ret;
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};
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static struct platform_driver gef_gpio_driver = {
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.driver = {
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.name = "gef-gpio",
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.of_match_table = gef_gpio_ids,
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},
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};
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module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);
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MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
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MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
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MODULE_LICENSE("GPL");
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