diff options
| -rw-r--r-- | drivers/phy/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/phy/Makefile | 1 | ||||
| -rw-r--r-- | drivers/phy/phy-rockchip-dp.c | 151 |
3 files changed, 159 insertions, 0 deletions
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index bc75f68770ab..f58e87064df4 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -344,6 +344,13 @@ config PHY_ROCKCHIP_EMMC help Enable this to support the Rockchip EMMC PHY. +config PHY_ROCKCHIP_DP + tristate "Rockchip Display Port PHY Driver" + depends on ARCH_ROCKCHIP && OF + select GENERIC_PHY + help + Enable this to support the Rockchip Display Port PHY. + config PHY_ST_SPEAR1310_MIPHY tristate "ST SPEAR1310-MIPHY driver" select GENERIC_PHY diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index 50260b42b850..24596a96a887 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -38,6 +38,7 @@ obj-$(CONFIG_PHY_EXYNOS5_USBDRD) += phy-exynos5-usbdrd.o obj-$(CONFIG_PHY_QCOM_APQ8064_SATA) += phy-qcom-apq8064-sata.o obj-$(CONFIG_PHY_ROCKCHIP_USB) += phy-rockchip-usb.o obj-$(CONFIG_PHY_ROCKCHIP_EMMC) += phy-rockchip-emmc.o +obj-$(CONFIG_PHY_ROCKCHIP_DP) += phy-rockchip-dp.o obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA) += phy-qcom-ipq806x-sata.o obj-$(CONFIG_PHY_ST_SPEAR1310_MIPHY) += phy-spear1310-miphy.o obj-$(CONFIG_PHY_ST_SPEAR1340_MIPHY) += phy-spear1340-miphy.o diff --git a/drivers/phy/phy-rockchip-dp.c b/drivers/phy/phy-rockchip-dp.c new file mode 100644 index 000000000000..77e2d02e6bee --- /dev/null +++ b/drivers/phy/phy-rockchip-dp.c @@ -0,0 +1,151 @@ +/* + * Rockchip DP PHY driver + * + * Copyright (C) 2016 FuZhou Rockchip Co., Ltd. + * Author: Yakir Yang <ykk@@rock-chips.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License. + */ + +#include <linux/clk.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#define GRF_SOC_CON12 0x0274 + +#define GRF_EDP_REF_CLK_SEL_INTER_HIWORD_MASK BIT(20) +#define GRF_EDP_REF_CLK_SEL_INTER BIT(4) + +#define GRF_EDP_PHY_SIDDQ_HIWORD_MASK BIT(21) +#define GRF_EDP_PHY_SIDDQ_ON 0 +#define GRF_EDP_PHY_SIDDQ_OFF BIT(5) + +struct rockchip_dp_phy { + struct device *dev; + struct regmap *grf; + struct clk *phy_24m; +}; + +static int rockchip_set_phy_state(struct phy *phy, bool enable) +{ + struct rockchip_dp_phy *dp = phy_get_drvdata(phy); + int ret; + + if (enable) { + ret = regmap_write(dp->grf, GRF_SOC_CON12, + GRF_EDP_PHY_SIDDQ_HIWORD_MASK | + GRF_EDP_PHY_SIDDQ_ON); + if (ret < 0) { + dev_err(dp->dev, "Can't enable PHY power %d\n", ret); + return ret; + } + + ret = clk_prepare_enable(dp->phy_24m); + } else { + clk_disable_unprepare(dp->phy_24m); + + ret = regmap_write(dp->grf, GRF_SOC_CON12, + GRF_EDP_PHY_SIDDQ_HIWORD_MASK | + GRF_EDP_PHY_SIDDQ_OFF); + } + + return ret; +} + +static int rockchip_dp_phy_power_on(struct phy *phy) +{ + return rockchip_set_phy_state(phy, true); +} + +static int rockchip_dp_phy_power_off(struct phy *phy) +{ + return rockchip_set_phy_state(phy, false); +} + +static const struct phy_ops rockchip_dp_phy_ops = { + .power_on = rockchip_dp_phy_power_on, + .power_off = rockchip_dp_phy_power_off, + .owner = THIS_MODULE, +}; + +static int rockchip_dp_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct phy_provider *phy_provider; + struct rockchip_dp_phy *dp; + struct phy *phy; + int ret; + + if (!np) + return -ENODEV; + + dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL); + if (IS_ERR(dp)) + return -ENOMEM; + + dp->dev = dev; + + dp->phy_24m = devm_clk_get(dev, "24m"); + if (IS_ERR(dp->phy_24m)) { + dev_err(dev, "cannot get clock 24m\n"); + return PTR_ERR(dp->phy_24m); + } + + ret = clk_set_rate(dp->phy_24m, 24000000); + if (ret < 0) { + dev_err(dp->dev, "cannot set clock phy_24m %d\n", ret); + return ret; + } + + dp->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf"); + if (IS_ERR(dp->grf)) { + dev_err(dev, "rk3288-dp needs rockchip,grf property\n"); + return PTR_ERR(dp->grf); + } + + ret = regmap_write(dp->grf, GRF_SOC_CON12, GRF_EDP_REF_CLK_SEL_INTER | + GRF_EDP_REF_CLK_SEL_INTER_HIWORD_MASK); + if (ret != 0) { + dev_err(dp->dev, "Could not config GRF edp ref clk: %d\n", ret); + return ret; + } + + phy = devm_phy_create(dev, np, &rockchip_dp_phy_ops); + if (IS_ERR(phy)) { + dev_err(dev, "failed to create phy\n"); + return PTR_ERR(phy); + } + phy_set_drvdata(phy, dp); + + 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 rockchip_dp_phy_dt_ids[] = { + { .compatible = "rockchip,rk3288-dp-phy" }, + {} +}; + +MODULE_DEVICE_TABLE(of, rockchip_dp_phy_dt_ids); + +static struct platform_driver rockchip_dp_phy_driver = { + .probe = rockchip_dp_phy_probe, + .driver = { + .name = "rockchip-dp-phy", + .of_match_table = rockchip_dp_phy_dt_ids, + }, +}; + +module_platform_driver(rockchip_dp_phy_driver); + +MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>"); +MODULE_DESCRIPTION("Rockchip DP PHY driver"); +MODULE_LICENSE("GPL v2"); |
