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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/net/mdio/mdio-mux-gpio.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/net/mdio/mdio-mux-gpio.c')
-rw-r--r-- | drivers/net/mdio/mdio-mux-gpio.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/drivers/net/mdio/mdio-mux-gpio.c b/drivers/net/mdio/mdio-mux-gpio.c new file mode 100644 index 000000000..3c7f16f06 --- /dev/null +++ b/drivers/net/mdio/mdio-mux-gpio.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2011, 2012 Cavium, Inc. + */ + +#include <linux/device.h> +#include <linux/gpio/consumer.h> +#include <linux/mdio-mux.h> +#include <linux/module.h> +#include <linux/of_mdio.h> +#include <linux/phy.h> +#include <linux/platform_device.h> + +#define DRV_VERSION "1.1" +#define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver" + +struct mdio_mux_gpio_state { + struct gpio_descs *gpios; + void *mux_handle; +}; + +static int mdio_mux_gpio_switch_fn(int current_child, int desired_child, + void *data) +{ + struct mdio_mux_gpio_state *s = data; + DECLARE_BITMAP(values, BITS_PER_TYPE(desired_child)); + + if (current_child == desired_child) + return 0; + + values[0] = desired_child; + + gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc, + s->gpios->info, values); + + return 0; +} + +static int mdio_mux_gpio_probe(struct platform_device *pdev) +{ + struct mdio_mux_gpio_state *s; + struct gpio_descs *gpios; + int r; + + gpios = devm_gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW); + if (IS_ERR(gpios)) + return PTR_ERR(gpios); + + s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL); + if (!s) + return -ENOMEM; + + s->gpios = gpios; + + r = mdio_mux_init(&pdev->dev, pdev->dev.of_node, + mdio_mux_gpio_switch_fn, &s->mux_handle, s, NULL); + + if (r != 0) + return r; + + pdev->dev.platform_data = s; + return 0; +} + +static int mdio_mux_gpio_remove(struct platform_device *pdev) +{ + struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev); + mdio_mux_uninit(s->mux_handle); + return 0; +} + +static const struct of_device_id mdio_mux_gpio_match[] = { + { + .compatible = "mdio-mux-gpio", + }, + { + /* Legacy compatible property. */ + .compatible = "cavium,mdio-mux-sn74cbtlv3253", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match); + +static struct platform_driver mdio_mux_gpio_driver = { + .driver = { + .name = "mdio-mux-gpio", + .of_match_table = mdio_mux_gpio_match, + }, + .probe = mdio_mux_gpio_probe, + .remove = mdio_mux_gpio_remove, +}; + +module_platform_driver(mdio_mux_gpio_driver); + +MODULE_DESCRIPTION(DRV_DESCRIPTION); +MODULE_VERSION(DRV_VERSION); +MODULE_AUTHOR("David Daney"); +MODULE_LICENSE("GPL v2"); |