A good number of phy implementations don't have a dedicated register map and only do simple clock or regulator configurations. Add support for a generic driver which just does such simple configurations. The driver optionally gets all the generic phy attributes and also the pwr regulator node. It also includes a generic implementation of phy_power_on() and phy_power_off(). Signed-off-by: Faiz Abbas <faiz_abbas@xxxxxx> --- drivers/phy/Kconfig | 7 +++ drivers/phy/Makefile | 1 + drivers/phy/phy-of-simple.c | 90 +++++++++++++++++++++++++++++++++++++ 3 files changed, 98 insertions(+) create mode 100644 drivers/phy/phy-of-simple.c diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index 60f949e2a684..e66039560da9 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -40,6 +40,13 @@ config PHY_XGENE help This option enables support for APM X-Gene SoC multi-purpose PHY. +config PHY_OF_SIMPLE + tristate "PHY Simple Driver" + select GENERIC_PHY + help + This driver supports simple generic phy implementations which don't + need a dedicated register map. + source "drivers/phy/allwinner/Kconfig" source "drivers/phy/amlogic/Kconfig" source "drivers/phy/broadcom/Kconfig" diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index 0301e25d07c1..ffef0fdf2c68 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -4,6 +4,7 @@ # obj-$(CONFIG_GENERIC_PHY) += phy-core.o +obj-$(CONFIG_PHY_OF_SIMPLE) += phy-of-simple.o obj-$(CONFIG_PHY_LPC18XX_USB_OTG) += phy-lpc18xx-usb-otg.o obj-$(CONFIG_PHY_XGENE) += phy-xgene.o obj-$(CONFIG_PHY_PISTACHIO_USB) += phy-pistachio-usb.o diff --git a/drivers/phy/phy-of-simple.c b/drivers/phy/phy-of-simple.c new file mode 100644 index 000000000000..0194aae90d3c --- /dev/null +++ b/drivers/phy/phy-of-simple.c @@ -0,0 +1,90 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * phy-of-simple.c - phy driver for simple implementations + * + * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com + * + */ +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/regulator/consumer.h> + +static int phy_simple_power_on(struct phy *phy) +{ + if (phy->pwr) + return regulator_enable(phy->pwr); + + return 0; +} + +static int phy_simple_power_off(struct phy *phy) +{ + if (phy->pwr) + return regulator_disable(phy->pwr); + + return 0; +} + +static const struct phy_ops phy_simple_ops = { + .power_on = phy_simple_power_on, + .power_off = phy_simple_power_off, + .owner = THIS_MODULE, +}; + +int phy_simple_probe(struct platform_device *pdev) +{ + struct phy_provider *phy_provider; + struct device *dev = &pdev->dev; + struct regulator *pwr = NULL; + struct phy *phy; + u32 bus_width = 0; + u32 max_bitrate = 0; + int ret; + + phy = devm_phy_create(dev, dev->of_node, + &phy_simple_ops); + + if (IS_ERR(phy)) { + dev_err(dev, "Failed to create phy\n"); + return PTR_ERR(phy); + } + + device_property_read_u32(dev, "bus-width", &bus_width); + phy->attrs.bus_width = bus_width; + device_property_read_u32(dev, "max-bitrate", &max_bitrate); + phy->attrs.max_bitrate = max_bitrate; + + pwr = devm_regulator_get_optional(dev, "pwr"); + if (IS_ERR(pwr)) { + ret = PTR_ERR(pwr); + dev_err(dev, "Couldn't get regulator. ret=%d\n", ret); + return ret; + } + phy->pwr = pwr; + + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + + return PTR_ERR_OR_ZERO(phy_provider); +} + +static const struct of_device_id phy_simple_dt_ids[] = { + { .compatible = "simple-phy"}, + {} +}; + +MODULE_DEVICE_TABLE(of, phy_simple_phy_dt_ids); + +static struct platform_driver phy_simple_driver = { + .probe = phy_simple_probe, + .driver = { + .name = "phy-of-simple", + .of_match_table = phy_simple_dt_ids, + }, +}; + +module_platform_driver(phy_simple_driver); + +MODULE_AUTHOR("Faiz Abbas <faiz_abbas@xxxxxx>"); +MODULE_DESCRIPTION("Simple PHY driver"); +MODULE_LICENSE("GPL v2"); -- 2.18.0
