[PATCH V4 2/4] phy: Add driver for Exynos DP PHY

Jingoo Han
2013-07-02T08:40:31Z

Add a PHY provider driver for the Samsung Exynos SoC DP PHY.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Felipe Balbi <balbi@ti.com>
---
.../devicetree/bindings/phy/samsung-phy.txt | 8 ++
drivers/phy/Kconfig | 6 ++
drivers/phy/Makefile | 1 +
drivers/phy/phy-exynos-dp-video.c | 111 ++++++++++++++++++++
4 files changed, 126 insertions(+)
create mode 100644 drivers/phy/phy-exynos-dp-video.c

diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt b/Documentation/devicetree/bindings/phy/samsung-phy.txt
index 5ff208c..c0fccaa 100644
--- a/Documentation/devicetree/bindings/phy/samsung-phy.txt
+++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt
@@ -12,3 +12,11 @@ the PHY specifier identifies the PHY and its meaning is as follows:
1 - MIPI DSIM 0,
2 - MIPI CSIS 1,
3 - MIPI DSIM 1.
+
+Samsung EXYNOS SoC series Display Port PHY
+-------------------------------------------------
+
+Required properties:
+- compatible : should be "samsung,exynos5250-dp-video-phy";
+- reg : offset and length of the Display Port PHY register set;
+- #phy-cells : from the generic PHY bindings, must be 0;
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 6f446d0..ed0b1b8 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -19,4 +19,10 @@ config PHY_EXYNOS_MIPI_VIDEO
help
Support for MIPI CSI-2 and MIPI DSI DPHY found on Samsung
S5P and EXYNOS SoCs.
+
+config PHY_EXYNOS_DP_VIDEO
+ tristate "EXYNOS SoC series Display Port PHY driver"
+ depends on OF
+ help
+ Support for Display Port PHY found on Samsung EXYNOS SoCs.
endif
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 71d8841..0fd1340 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -4,3 +4,4 @@

obj-$(CONFIG_GENERIC_PHY) += phy-core.o
obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO) += phy-exynos-mipi-video.o
+obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO) += phy-exynos-dp-video.o
diff --git a/drivers/phy/phy-exynos-dp-video.c b/drivers/phy/phy-exynos-dp-video.c
new file mode 100644
index 0000000..3c8e247
--- /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, 0, &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");
--
1.7.10.4