Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / phy / phy-exynos-dp-video.c

diff --git a/kernel/drivers/phy/phy-exynos-dp-video.c b/kernel/drivers/phy/phy-exynos-dp-video.c
new file mode 100644 (file)
index 0000000..179cbf9
--- /dev/null
+++ b/kernel/drivers/phy/phy-exynos-dp-video.c
@@ -0,0 +1,122 @@
+/*
+ * 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/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mfd/syscon/exynos5-pmu.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+struct exynos_dp_video_phy_drvdata {
+       u32 phy_ctrl_offset;
+};
+
+struct exynos_dp_video_phy {
+       struct regmap *regs;
+       const struct exynos_dp_video_phy_drvdata *drvdata;
+};
+
+static int exynos_dp_video_phy_power_on(struct phy *phy)
+{
+       struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
+
+       /* Disable power isolation on DP-PHY */
+       return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
+                                 EXYNOS5_PHY_ENABLE, EXYNOS5_PHY_ENABLE);
+}
+
+static int exynos_dp_video_phy_power_off(struct phy *phy)
+{
+       struct exynos_dp_video_phy *state = phy_get_drvdata(phy);
+
+       /* Enable power isolation on DP-PHY */
+       return regmap_update_bits(state->regs, state->drvdata->phy_ctrl_offset,
+                                 EXYNOS5_PHY_ENABLE, 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 const struct exynos_dp_video_phy_drvdata exynos5250_dp_video_phy = {
+       .phy_ctrl_offset        = EXYNOS5_DPTX_PHY_CONTROL,
+};
+
+static const struct exynos_dp_video_phy_drvdata exynos5420_dp_video_phy = {
+       .phy_ctrl_offset        = EXYNOS5420_DPTX_PHY_CONTROL,
+};
+
+static const struct of_device_id exynos_dp_video_phy_of_match[] = {
+       {
+               .compatible = "samsung,exynos5250-dp-video-phy",
+               .data = &exynos5250_dp_video_phy,
+       }, {
+               .compatible = "samsung,exynos5420-dp-video-phy",
+               .data = &exynos5420_dp_video_phy,
+       },
+       { },
+};
+MODULE_DEVICE_TABLE(of, exynos_dp_video_phy_of_match);
+
+static int exynos_dp_video_phy_probe(struct platform_device *pdev)
+{
+       struct exynos_dp_video_phy *state;
+       struct device *dev = &pdev->dev;
+       const struct of_device_id *match;
+       struct phy_provider *phy_provider;
+       struct phy *phy;
+
+       state = devm_kzalloc(dev, sizeof(*state), GFP_KERNEL);
+       if (!state)
+               return -ENOMEM;
+
+       state->regs = syscon_regmap_lookup_by_phandle(dev->of_node,
+                                                     "samsung,pmu-syscon");
+       if (IS_ERR(state->regs)) {
+               dev_err(dev, "Failed to lookup PMU regmap\n");
+               return PTR_ERR(state->regs);
+       }
+
+       match = of_match_node(exynos_dp_video_phy_of_match, dev->of_node);
+       state->drvdata = match->data;
+
+       phy = devm_phy_create(dev, NULL, &exynos_dp_video_phy_ops);
+       if (IS_ERR(phy)) {
+               dev_err(dev, "failed to create Display Port PHY\n");
+               return PTR_ERR(phy);
+       }
+       phy_set_drvdata(phy, state);
+
+       phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+       return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static struct platform_driver exynos_dp_video_phy_driver = {
+       .probe  = exynos_dp_video_phy_probe,
+       .driver = {
+               .name   = "exynos-dp-video-phy",
+               .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");