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Date: Mon, 27 Oct 2008 08:37:34 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: Paulius Zaleckas <paulius.zaleckas@...tonika.lt>
Cc: netdev@...r.kernel.org, linux-arm-kernel@...ts.arm.linux.org.uk,
linux-embedded@...r.kernel.org
Subject: Re: [PATCH] phylib: add mdio-gpio bus driver (v2)
On Mon, Oct 27, 2008 at 12:53:22PM +0200, Paulius Zaleckas wrote:
> Useful for machines where PHY control is connected to GPIO.
> This driver also supports interrupts from PHY.
>
> Changes since v1:
> - fixed releasing of gpio (thanks to Sascha Hauer)
> - fixed compiling due to bus->dev to bus->parent change
>
> Signed-off-by: Paulius Zaleckas <paulius.zaleckas@...tonika.lt>
> ---
Well structured driver. Comments below.
> diff --git a/drivers/net/phy/mdio-gpio.c b/drivers/net/phy/mdio-gpio.c
> new file mode 100644
> index 0000000..585897b
> --- /dev/null
> +++ b/drivers/net/phy/mdio-gpio.c
> @@ -0,0 +1,187 @@
> +/*
> + * GPIO based MDIO bitbang driver.
> + *
> + * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@...tonika.lt>
> + *
> + * Based on mdio-ofgpio.c:
> + *
> + * Copyright (c) 2008 CSE Semaphore Belgium.
> + * by Laurent Pinchart <laurentp@...-semaphore.com>
> + *
> + * Copyright (c) 2003 Intracom S.A.
> + * by Pantelis Antoniou <panto@...racom.gr>
> + *
> + * 2005 (c) MontaVista Software, Inc.
> + * Vitaly Bordug <vbordug@...mvista.com>
> + *
> + * This file is licensed under the terms of the GNU General Public License
> + * version 2. This program is licensed "as is" without any warranty of any
> + * kind, whether express or implied.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/platform_device.h>
> +#include <linux/gpio.h>
> +#include <linux/mdio-bitbang.h>
> +#include <linux/mdio-gpio.h>
Missing:
MODULE_AUTHOR()
MODULE_LICENSE()
MODULE_DESCRIPTION()
> +static int __devinit mdio_gpio_probe(struct platform_device *pdev)
> +{
> + struct mii_bus *new_bus;
> + struct mdio_gpio_info *bitbang;
> + struct mdio_gpio_platform_data *pdata;
> + int ret = -ENOMEM;
> + int i;
> +
> + pdata = pdev->dev.platform_data;
> + if (pdata == NULL)
> + goto out;
> +
> + bitbang = kzalloc(sizeof(struct mdio_gpio_info), GFP_KERNEL);
> + if (!bitbang)
> + goto out;
> +
> + bitbang->ctrl.ops = &mdio_gpio_ops;
> + bitbang->mdc = pdata->mdc;
> + bitbang->mdio = pdata->mdio;
> +
> + if (gpio_request(bitbang->mdc, "mdc"))
> + goto out_free_bitbang;
> +
> + if (gpio_request(bitbang->mdio, "mdio"))
> + goto out_free_mdc;
> +
> + new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
> + if (!new_bus)
> + goto out_free_gpio;
> +
> + new_bus->name = "GPIO Bitbanged MII",
> + snprintf(new_bus->id, MII_BUS_ID_SIZE, "phy%i", pdev->id);
> +
> + new_bus->phy_mask = ~0;
> + new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
> + if (!new_bus->irq)
> + goto out_free_bus;
The IRQ array is fixed size. You can add it to the mdio_gpio_info
structure and then just set the pointer here so that only one kzalloc
is needed.
> +
> + for (i = 0; i < PHY_MAX_ADDR; i++)
> + new_bus->irq[i] = PHY_POLL;
> +
> + for (i = 0; i < pdata->nr_phys; i++) {
> + unsigned int phy_addr = pdata->phys[i].addr;
> +
> + BUG_ON(phy_addr >= PHY_MAX_ADDR);
Is it really worth bringing down the whole kernel when too many phys are
specified in pdata?
> +
> + new_bus->phy_mask &= ~(1 << phy_addr);
> + new_bus->irq[phy_addr] = pdata->phys[i].irq;
> + }
> +
> + new_bus->parent = &pdev->dev;
> + platform_set_drvdata(pdev, new_bus);
> +
> + ret = mdiobus_register(new_bus);
> + if (ret)
> + goto out_free_all;
> +
> + return 0;
> +
> +out_free_all:
> + platform_set_drvdata(pdev, NULL);
> + kfree(new_bus->irq);
> +out_free_bus:
> + free_mdio_bitbang(new_bus);
> +out_free_gpio:
> + gpio_free(bitbang->mdio);
> +out_free_mdc:
> + gpio_free(bitbang->mdc);
> +out_free_bitbang:
> + kfree(bitbang);
> +out:
> + return ret;
Nit: labels in column 0 will confuse diff when it tries to put the
function name in the diff hunk header. If you indent the labels by 1
space then future diffs will show the function name instead of the label
name in diff hunk headers.
> +}
> +
> +static int __devexit mdio_gpio_remove(struct platform_device *pdev)
> +{
> + struct mii_bus *bus = platform_get_drvdata(pdev);
> + struct mdio_gpio_info *bitbang = bus->priv;
> +
> + mdiobus_unregister(bus);
> + kfree(bus->irq);
> + free_mdio_bitbang(bus);
> + platform_set_drvdata(pdev, NULL);
> + gpio_free(bitbang->mdc);
> + gpio_free(bitbang->mdio);
> + kfree(bitbang);
> +
> + return 0;
> +}
> +
> +static struct platform_driver mdio_gpio_driver = {
> + .probe = mdio_gpio_probe,
> + .remove = __devexit_p(mdio_gpio_remove),
> + .driver = {
> + .name = "mdio-gpio",
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +static int mdio_gpio_init(void)
static int __init mdio_gpio_init(void)
> +{
> + return platform_driver_register(&mdio_gpio_driver);
> +}
> +
> +static void mdio_gpio_exit(void)
static void __exit mdio_gpio_exit(void)
> +{
> + platform_driver_unregister(&mdio_gpio_driver);
> +}
> +
> +module_init(mdio_gpio_init);
> +module_exit(mdio_gpio_exit);
--
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