f20e6657a8
An integrated multiplexer uses same address space for "muxed bus selection" and "generation of mdio transaction" hence its good to register parent bus from mux driver. Hence added a mechanism where mux driver could register a parent bus and pass it down to framework via mdio_mux_init api. Signed-off-by: Pramod Kumar <pramod.kumar@broadcom.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2011, 2012 Cavium, Inc.
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*/
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#include <linux/platform_device.h>
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#include <linux/device.h>
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#include <linux/of_mdio.h>
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#include <linux/module.h>
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#include <linux/phy.h>
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#include <linux/mdio-mux.h>
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#include <linux/gpio/consumer.h>
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#define DRV_VERSION "1.1"
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#define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"
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struct mdio_mux_gpio_state {
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struct gpio_descs *gpios;
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void *mux_handle;
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};
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static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
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void *data)
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{
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struct mdio_mux_gpio_state *s = data;
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int values[s->gpios->ndescs];
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unsigned int n;
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if (current_child == desired_child)
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return 0;
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for (n = 0; n < s->gpios->ndescs; n++)
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values[n] = (desired_child >> n) & 1;
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gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
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values);
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return 0;
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}
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static int mdio_mux_gpio_probe(struct platform_device *pdev)
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{
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struct mdio_mux_gpio_state *s;
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int r;
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s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
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if (!s)
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return -ENOMEM;
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s->gpios = gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
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if (IS_ERR(s->gpios))
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return PTR_ERR(s->gpios);
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r = mdio_mux_init(&pdev->dev,
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mdio_mux_gpio_switch_fn, &s->mux_handle, s, NULL);
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if (r != 0) {
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gpiod_put_array(s->gpios);
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return r;
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}
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pdev->dev.platform_data = s;
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return 0;
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}
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static int mdio_mux_gpio_remove(struct platform_device *pdev)
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{
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struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
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mdio_mux_uninit(s->mux_handle);
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gpiod_put_array(s->gpios);
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return 0;
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}
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static const struct of_device_id mdio_mux_gpio_match[] = {
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{
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.compatible = "mdio-mux-gpio",
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},
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{
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/* Legacy compatible property. */
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.compatible = "cavium,mdio-mux-sn74cbtlv3253",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
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static struct platform_driver mdio_mux_gpio_driver = {
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.driver = {
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.name = "mdio-mux-gpio",
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.of_match_table = mdio_mux_gpio_match,
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},
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.probe = mdio_mux_gpio_probe,
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.remove = mdio_mux_gpio_remove,
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};
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module_platform_driver(mdio_mux_gpio_driver);
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MODULE_DESCRIPTION(DRV_DESCRIPTION);
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MODULE_VERSION(DRV_VERSION);
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MODULE_AUTHOR("David Daney");
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MODULE_LICENSE("GPL");
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