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author | Jingoo Han <jg1.han@samsung.com> | 2013-10-16 16:28:14 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-16 20:48:08 (GMT) |
commit | 74988e8b5718b561457fd035dc3ab9b9d8f45a5d (patch) | |
tree | b18855ad19447b2ffea5be7799dfb65de86e447d /drivers/phy/phy-exynos-dp-video.c | |
parent | e66f233dc7f7aef51d82cac1b93b46f7c9bf42ef (diff) | |
download | linux-74988e8b5718b561457fd035dc3ab9b9d8f45a5d.tar.xz |
phy: Add driver for Exynos DP PHY
Add a PHY provider driver for the Samsung Exynos SoC Display Port PHY.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/phy/phy-exynos-dp-video.c')
-rw-r--r-- | drivers/phy/phy-exynos-dp-video.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/phy/phy-exynos-dp-video.c b/drivers/phy/phy-exynos-dp-video.c new file mode 100644 index 0000000..1dbe6ce --- /dev/null +++ b/drivers/phy/phy-exynos-dp-video.c @@ -0,0 +1,111 @@ +/* + * Samsung EXYNOS SoC series Display Port PHY driver + * + * Copyright (C) 2013 Samsung Electronics Co., Ltd. + * Author: Jingoo Han <jg1.han@samsung.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> + +/* DPTX_PHY_CONTROL register */ +#define EXYNOS_DPTX_PHY_ENABLE (1 << 0) + +struct exynos_dp_video_phy { + void __iomem *regs; +}; + +static int __set_phy_state(struct exynos_dp_video_phy *state, unsigned int on) +{ + u32 reg; + + reg = readl(state->regs); + if (on) + reg |= EXYNOS_DPTX_PHY_ENABLE; + else + reg &= ~EXYNOS_DPTX_PHY_ENABLE; + writel(reg, state->regs); + + return 0; +} + +static int exynos_dp_video_phy_power_on(struct phy *phy) +{ + struct exynos_dp_video_phy *state = phy_get_drvdata(phy); + + return __set_phy_state(state, 1); +} + +static int exynos_dp_video_phy_power_off(struct phy *phy) +{ + struct exynos_dp_video_phy *state = phy_get_drvdata(phy); + + return __set_phy_state(state, 0); +} + +static struct phy_ops exynos_dp_video_phy_ops = { + .power_on = exynos_dp_video_phy_power_on, + .power_off = exynos_dp_video_phy_power_off, + .owner = THIS_MODULE, +}; + +static int exynos_dp_video_phy_probe(struct platform_device *pdev) +{ + struct exynos_dp_video_phy *state; + struct device *dev = &pdev->dev; + struct resource *res; + struct phy_provider *phy_provider; + struct phy *phy; + + state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL); + if (!state) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + state->regs = devm_ioremap_resource(dev, res); + if (IS_ERR(state->regs)) + return PTR_ERR(state->regs); + + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + if (IS_ERR(phy_provider)) + return PTR_ERR(phy_provider); + + phy = devm_phy_create(dev, &exynos_dp_video_phy_ops, NULL); + if (IS_ERR(phy)) { + dev_err(dev, "failed to create Display Port PHY\n"); + return PTR_ERR(phy); + } + phy_set_drvdata(phy, state); + + return 0; +} + +static const struct of_device_id exynos_dp_video_phy_of_match[] = { + { .compatible = "samsung,exynos5250-dp-video-phy" }, + { }, +}; +MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match); + +static struct platform_driver exynos_dp_video_phy_driver = { + .probe = exynos_dp_video_phy_probe, + .driver = { + .name = "exynos-dp-video-phy", + .owner = THIS_MODULE, + .of_match_table = exynos_dp_video_phy_of_match, + } +}; +module_platform_driver(exynos_dp_video_phy_driver); + +MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>"); +MODULE_DESCRIPTION("Samsung EXYNOS SoC DP PHY driver"); +MODULE_LICENSE("GPL v2"); |