From: Hauke Mehrtens <hauke-5/S+JYg5SzeELgA04lAiVw@public.gmane.org> To: ralf-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org Cc: linux-mips-6z/3iImG2C8G8FEW9MqTrA@public.gmane.org, linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-watchdog-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org, john-Pj+rj9U5foFAfugRpC6u6w@public.gmane.org, linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, hauke.mehrtens-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, andy.shevchenko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org, Hauke Mehrtens <hauke-5/S+JYg5SzeELgA04lAiVw@public.gmane.org>, Kishon Vijay Abraham I <kishon-l0cyMroinI0@public.gmane.org> Subject: [PATCH v7 14/16] phy: Add an USB PHY driver for the Lantiq SoCs using the RCU module Date: Mon, 3 Jul 2017 00:40:49 +0200 [thread overview] Message-ID: <20170702224051.15109-15-hauke@hauke-m.de> (raw) In-Reply-To: <20170702224051.15109-1-hauke-5/S+JYg5SzeELgA04lAiVw@public.gmane.org> This driver starts the DWC2 core(s) built into the XWAY SoCs and provides the PHY interfaces for each core. The phy instances can be passed to the dwc2 driver, which already supports the generic phy interface. Signed-off-by: Hauke Mehrtens <hauke-5/S+JYg5SzeELgA04lAiVw@public.gmane.org> Cc: Kishon Vijay Abraham I <kishon-l0cyMroinI0@public.gmane.org> --- .../bindings/phy/phy-lantiq-rcu-usb2.txt | 42 ++++ arch/mips/lantiq/xway/sysctrl.c | 24 +- drivers/phy/Kconfig | 8 + drivers/phy/Makefile | 1 + drivers/phy/phy-lantiq-rcu-usb2.c | 275 +++++++++++++++++++++ 5 files changed, 338 insertions(+), 12 deletions(-) create mode 100644 Documentation/devicetree/bindings/phy/phy-lantiq-rcu-usb2.txt create mode 100644 drivers/phy/phy-lantiq-rcu-usb2.c diff --git a/Documentation/devicetree/bindings/phy/phy-lantiq-rcu-usb2.txt b/Documentation/devicetree/bindings/phy/phy-lantiq-rcu-usb2.txt new file mode 100644 index 000000000000..c538baa2ba54 --- /dev/null +++ b/Documentation/devicetree/bindings/phy/phy-lantiq-rcu-usb2.txt @@ -0,0 +1,42 @@ +Lantiq XWAY SoC RCU USB 1.1/2.0 PHY binding +=========================================== + +This binding describes the USB PHY hardware provided by the RCU module on the +Lantiq XWAY SoCs. + +This driver has to be a sub node of the Lantiq RCU block. + +------------------------------------------------------------------------------- +Required properties (controller (parent) node): +- compatible : Should be one of + "lantiq,ase-usb2-phy" + "lantiq,danube-usb2-phy" + "lantiq,xrx100-usb2-phy" + "lantiq,xrx200-usb2-phy" + "lantiq,xrx300-usb2-phy" +- offset-phy : Offset of the USB PHY configuration register +- offset-ana : Offset of the USB Analog configuration register +- clocks : References to the (PMU) "ctrl" and "phy" clk gates. +- clock-names : Must be one of the following: + "ctrl" + "phy" +- resets : References to the RCU USB configuration reset bits. +- reset-names : Must be one of the following: + "phy" (optional) + "ctrl" (shared) + +------------------------------------------------------------------------------- +Example for the USB PHYs on an xRX200 SoC: + usb_phy0: usb2-phy@18 { + compatible = "lantiq,xrx200-usb2-phy"; + reg = <0x18 4>, <0x38 4>; + + offset-phy = <0x18>; + offset-ana = <0x38>; + clocks = <&pmu PMU_GATE_USB0_CTRL>, + <&pmu PMU_GATE_USB0_PHY>; + clock-names = "ctrl", "phy"; + resets = <&reset1 4 4>, <&reset0 4 4>; + reset-names = "phy", "ctrl"; + #phy-cells = <0>; + }; diff --git a/arch/mips/lantiq/xway/sysctrl.c b/arch/mips/lantiq/xway/sysctrl.c index 87eab4d288e5..f76978e4da32 100644 --- a/arch/mips/lantiq/xway/sysctrl.c +++ b/arch/mips/lantiq/xway/sysctrl.c @@ -469,8 +469,8 @@ void __init ltq_soc_init(void) if (of_machine_is_compatible("lantiq,grx390") || of_machine_is_compatible("lantiq,ar10")) { - clkdev_add_pmu("1e101000.usb", "phy", 1, 2, PMU_ANALOG_USB0_P); - clkdev_add_pmu("1e106000.usb", "phy", 1, 2, PMU_ANALOG_USB1_P); + clkdev_add_pmu("1f203018.usb2-phy", "phy", 1, 2, PMU_ANALOG_USB0_P); + clkdev_add_pmu("1f203034.usb2-phy", "phy", 1, 2, PMU_ANALOG_USB1_P); /* rc 0 */ clkdev_add_pmu("1d900000.pcie", "phy", 1, 2, PMU_ANALOG_PCIE0_P); clkdev_add_pmu("1d900000.pcie", "msi", 1, 1, PMU1_PCIE_MSI); @@ -490,8 +490,8 @@ void __init ltq_soc_init(void) else clkdev_add_static(CLOCK_133M, CLOCK_133M, CLOCK_133M, CLOCK_133M); - clkdev_add_pmu("1e101000.usb", "ctl", 1, 0, PMU_USB0); - clkdev_add_pmu("1e101000.usb", "phy", 1, 0, PMU_USB0_P); + clkdev_add_pmu("1f203018.usb2-phy", "ctrl", 1, 0, PMU_USB0); + clkdev_add_pmu("1f203018.usb2-phy", "phy", 1, 0, PMU_USB0_P); clkdev_add_pmu("1e180000.etop", "ppe", 1, 0, PMU_PPE); clkdev_add_cgu("1e180000.etop", "ephycgu", CGU_EPHY); clkdev_add_pmu("1e180000.etop", "ephy", 1, 0, PMU_EPHY); @@ -526,10 +526,10 @@ void __init ltq_soc_init(void) } else if (of_machine_is_compatible("lantiq,vr9")) { clkdev_add_static(ltq_vr9_cpu_hz(), ltq_vr9_fpi_hz(), ltq_vr9_fpi_hz(), ltq_vr9_pp32_hz()); - clkdev_add_pmu("1e101000.usb", "phy", 1, 0, PMU_USB0_P); - clkdev_add_pmu("1e101000.usb", "ctl", 1, 0, PMU_USB0 | PMU_AHBM); - clkdev_add_pmu("1e106000.usb", "phy", 1, 0, PMU_USB1_P); - clkdev_add_pmu("1e106000.usb", "ctl", 1, 0, PMU_USB1 | PMU_AHBM); + clkdev_add_pmu("1f203018.usb2-phy", "phy", 1, 0, PMU_USB0_P); + clkdev_add_pmu("1f203018.usb2-phy", "ctrl", 1, 0, PMU_USB0 | PMU_AHBM); + clkdev_add_pmu("1f203034.usb2-phy", "phy", 1, 0, PMU_USB1_P); + clkdev_add_pmu("1f203034.usb2-phy", "ctrl", 1, 0, PMU_USB1 | PMU_AHBM); clkdev_add_pmu("1d900000.pcie", "phy", 1, 1, PMU1_PCIE_PHY); clkdev_add_pmu("1d900000.pcie", "bus", 1, 0, PMU_PCIE_CLK); clkdev_add_pmu("1d900000.pcie", "msi", 1, 1, PMU1_PCIE_MSI); @@ -550,8 +550,8 @@ void __init ltq_soc_init(void) } else if (of_machine_is_compatible("lantiq,ar9")) { clkdev_add_static(ltq_ar9_cpu_hz(), ltq_ar9_fpi_hz(), ltq_ar9_fpi_hz(), CLOCK_250M); - clkdev_add_pmu("1e101000.usb", "ctl", 1, 0, PMU_USB0); - clkdev_add_pmu("1e101000.usb", "phy", 1, 0, PMU_USB0_P); + clkdev_add_pmu("1f203018.usb2-phy", "ctrl", 1, 0, PMU_USB0); + clkdev_add_pmu("1f203018.usb2-phy", "phy", 1, 0, PMU_USB0_P); clkdev_add_pmu("1e106000.usb", "ctl", 1, 0, PMU_USB1); clkdev_add_pmu("1e106000.usb", "phy", 1, 0, PMU_USB1_P); clkdev_add_pmu("1e180000.etop", "switch", 1, 0, PMU_SWITCH); @@ -562,8 +562,8 @@ void __init ltq_soc_init(void) } else { clkdev_add_static(ltq_danube_cpu_hz(), ltq_danube_fpi_hz(), ltq_danube_fpi_hz(), ltq_danube_pp32_hz()); - clkdev_add_pmu("1e101000.usb", "ctl", 1, 0, PMU_USB0); - clkdev_add_pmu("1e101000.usb", "phy", 1, 0, PMU_USB0_P); + clkdev_add_pmu("1f203018.usb2-phy", "ctrl", 1, 0, PMU_USB0); + clkdev_add_pmu("1f203018.usb2-phy", "phy", 1, 0, PMU_USB0_P); clkdev_add_pmu("1e103000.sdio", NULL, 1, 0, PMU_SDIO); clkdev_add_pmu("1e103100.deu", NULL, 1, 0, PMU_DEU); clkdev_add_pmu("1e116000.mei", "dfe", 1, 0, PMU_DFE); diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index afaf7b643eeb..f7f6bfca20fc 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -507,6 +507,14 @@ config PHY_CYGNUS_PCIE Enable this to support the Broadcom Cygnus PCIe PHY. If unsure, say N. +config PHY_LANTIQ_RCU_USB2 + tristate "Lantiq XWAY SoC RCU based USB PHY" + depends on SOC_TYPE_XWAY + depends on OF + select GENERIC_PHY + help + Support for the USB PHY(s) on the Lantiq XWAY family SoCs. + source "drivers/phy/tegra/Kconfig" config PHY_NS2_PCIE diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index f8047b4639fa..d6ba19233001 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -61,6 +61,7 @@ obj-$(CONFIG_PHY_TUSB1210) += phy-tusb1210.o obj-$(CONFIG_PHY_BRCM_SATA) += phy-brcm-sata.o obj-$(CONFIG_PHY_PISTACHIO_USB) += phy-pistachio-usb.o obj-$(CONFIG_PHY_CYGNUS_PCIE) += phy-bcm-cygnus-pcie.o +obj-$(CONFIG_PHY_LANTIQ_RCU_USB2) += phy-lantiq-rcu-usb2.o obj-$(CONFIG_ARCH_TEGRA) += tegra/ obj-$(CONFIG_PHY_NS2_PCIE) += phy-bcm-ns2-pcie.o obj-$(CONFIG_PHY_MESON8B_USB2) += phy-meson8b-usb2.o diff --git a/drivers/phy/phy-lantiq-rcu-usb2.c b/drivers/phy/phy-lantiq-rcu-usb2.c new file mode 100644 index 000000000000..9cde229f108f --- /dev/null +++ b/drivers/phy/phy-lantiq-rcu-usb2.c @@ -0,0 +1,275 @@ +/* + * Lantiq XWAY SoC RCU module based USB 1.1/2.0 PHY driver + * + * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> + * Copyright (C) 2017 Hauke Mehrtens <hauke-5/S+JYg5SzeELgA04lAiVw@public.gmane.org> + * + * 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/clk.h> +#include <linux/delay.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/reset.h> + +/* Transmitter HS Pre-Emphasis Enable */ +#define RCU_CFG1_TX_PEE BIT(0) +/* Disconnect Threshold */ +#define RCU_CFG1_DIS_THR_MASK 0x00038000 +#define RCU_CFG1_DIS_THR_SHIFT 15 + +struct ltq_rcu_usb2_bits { + u8 hostmode; + u8 slave_endianness; + u8 host_endianness; + bool have_ana_cfg; +}; + +struct ltq_rcu_usb2_priv { + struct regmap *regmap; + u32 phy_reg_offset; + u32 ana_cfg1_reg_offset; + const struct ltq_rcu_usb2_bits *reg_bits; + struct device *dev; + struct phy *phy; + struct clk *ctrl_gate_clk; + struct clk *phy_gate_clk; + struct reset_control *ctrl_reset; + struct reset_control *phy_reset; +}; + +static const struct ltq_rcu_usb2_bits xway_rcu_usb2_reg_bits = { + .hostmode = 11, + .slave_endianness = 9, + .host_endianness = 10, + .have_ana_cfg = false, +}; + +static const struct ltq_rcu_usb2_bits xrx100_rcu_usb2_reg_bits = { + .hostmode = 11, + .slave_endianness = 17, + .host_endianness = 10, + .have_ana_cfg = false, +}; + +static const struct ltq_rcu_usb2_bits xrx200_rcu_usb2_reg_bits = { + .hostmode = 11, + .slave_endianness = 9, + .host_endianness = 10, + .have_ana_cfg = true, +}; + +static const struct of_device_id ltq_rcu_usb2_phy_of_match[] = { + { + .compatible = "lantiq,ase-usb2-phy", + .data = &xway_rcu_usb2_reg_bits, + }, + { + .compatible = "lantiq,danube-usb2-phy", + .data = &xway_rcu_usb2_reg_bits, + }, + { + .compatible = "lantiq,xrx100-usb2-phy", + .data = &xrx100_rcu_usb2_reg_bits, + }, + { + .compatible = "lantiq,xrx200-usb2-phy", + .data = &xrx200_rcu_usb2_reg_bits, + }, + { + .compatible = "lantiq,xrx300-usb2-phy", + .data = &xrx200_rcu_usb2_reg_bits, + }, + { }, +}; +MODULE_DEVICE_TABLE(of, ltq_rcu_usb2_phy_of_match); + + +static int ltq_rcu_usb2_phy_power_on(struct phy *phy) +{ + struct ltq_rcu_usb2_priv *priv = phy_get_drvdata(phy); + + reset_control_deassert(priv->phy_reset); + + return 0; +} + +static int ltq_rcu_usb2_phy_power_off(struct phy *phy) +{ + struct ltq_rcu_usb2_priv *priv = phy_get_drvdata(phy); + + reset_control_assert(priv->phy_reset); + + return 0; +} + +static struct phy_ops ltq_rcu_usb2_phy_ops = { + .power_on = ltq_rcu_usb2_phy_power_on, + .power_off = ltq_rcu_usb2_phy_power_off, + .owner = THIS_MODULE, +}; + +static int ltq_rcu_usb2_start_cores(struct ltq_rcu_usb2_priv *priv) +{ + struct device *dev = priv->dev; + int ret; + + /* Power on the USB core. */ + ret = clk_prepare_enable(priv->ctrl_gate_clk); + if (ret) { + dev_err(dev, "failed to enable CTRL gate\n"); + return ret; + } + + /* + * Power on the USB PHY. We have to do it early because + * otherwise the second core won't turn on properly. + */ + ret = clk_prepare_enable(priv->phy_gate_clk); + if (ret) { + clk_disable_unprepare(priv->ctrl_gate_clk); + dev_err(dev, "failed to enable PHY gate\n"); + return ret; + } + + if (priv->reg_bits->have_ana_cfg) { + regmap_update_bits(priv->regmap, priv->ana_cfg1_reg_offset, + RCU_CFG1_TX_PEE, RCU_CFG1_TX_PEE); + regmap_update_bits(priv->regmap, priv->ana_cfg1_reg_offset, + RCU_CFG1_DIS_THR_MASK, 7 << RCU_CFG1_DIS_THR_SHIFT); + } + + /* Configure core to host mode */ + regmap_update_bits(priv->regmap, priv->phy_reg_offset, + BIT(priv->reg_bits->hostmode), 0); + + /* Select DMA endianness (Host-endian: big-endian) */ + regmap_update_bits(priv->regmap, priv->phy_reg_offset, + BIT(priv->reg_bits->slave_endianness), 0); + regmap_update_bits(priv->regmap, priv->phy_reg_offset, + BIT(priv->reg_bits->host_endianness), + BIT(priv->reg_bits->host_endianness)); + + /* Reset USB core throgh reset controller */ + reset_control_deassert(priv->ctrl_reset); + + reset_control_assert(priv->phy_reset); + + return 0; +} + +static int ltq_rcu_usb2_of_probe(struct ltq_rcu_usb2_priv *priv) +{ + struct device *dev = priv->dev; + int ret; + + priv->reg_bits = of_device_get_match_data(dev); + + priv->regmap = syscon_node_to_regmap(dev->of_node->parent); + if (IS_ERR(priv->regmap)) { + dev_err(dev, "Failed to lookup RCU regmap\n"); + return PTR_ERR(priv->regmap); + } + + priv->ctrl_gate_clk = devm_clk_get(dev, "ctrl"); + if (IS_ERR(priv->ctrl_gate_clk)) { + dev_err(dev, "Unable to get USB ctrl gate clk\n"); + return PTR_ERR(priv->ctrl_gate_clk); + } + + priv->phy_gate_clk = devm_clk_get(dev, "phy"); + if (IS_ERR(priv->phy_gate_clk)) { + dev_err(dev, "Unable to get USB phy gate clk\n"); + return PTR_ERR(priv->phy_gate_clk); + } + + priv->ctrl_reset = devm_reset_control_get_shared(dev, "ctrl"); + if (IS_ERR(priv->ctrl_reset)) { + if (PTR_ERR(priv->ctrl_reset) != -EPROBE_DEFER) + dev_err(dev, "failed to get 'ctrl' reset\n"); + return PTR_ERR(priv->ctrl_reset); + } + + priv->phy_reset = devm_reset_control_get_optional(dev, "phy"); + if (IS_ERR(priv->phy_reset)) + return PTR_ERR(priv->phy_reset); + + ret = device_property_read_u32(dev, "offset-phy", + &priv->phy_reg_offset); + if (ret) { + dev_err(dev, "Failed to get RCU PHY reg offset\n"); + return ret; + } + + ret = device_property_read_u32(dev, "offset-ana", + &priv->ana_cfg1_reg_offset); + if (ret && priv->reg_bits->have_ana_cfg) { + dev_dbg(dev, "Failed to get RCU ANA CFG1 reg offset\n"); + return ret; + } + + return 0; +} + +static int ltq_rcu_usb2_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct ltq_rcu_usb2_priv *priv; + struct phy_provider *provider; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = dev; + + ret = ltq_rcu_usb2_of_probe(priv); + if (ret) + return ret; + + priv->phy = devm_phy_create(dev, dev->of_node, <q_rcu_usb2_phy_ops); + if (IS_ERR(priv->phy)) { + dev_err(dev, "failed to create PHY\n"); + return PTR_ERR(priv->phy); + } + + phy_set_drvdata(priv->phy, priv); + + ret = ltq_rcu_usb2_start_cores(priv); + if (ret) + return ret; + + provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + if (IS_ERR(provider)) { + clk_disable_unprepare(priv->phy_gate_clk); + clk_disable_unprepare(priv->ctrl_gate_clk); + return PTR_ERR(provider); + } + + dev_set_drvdata(priv->dev, priv); + return 0; +} + +static struct platform_driver ltq_rcu_usb2_phy_driver = { + .probe = ltq_rcu_usb2_phy_probe, + .driver = { + .name = "lantiq-rcu-usb2-phy", + .of_match_table = ltq_rcu_usb2_phy_of_match, + } +}; +module_platform_driver(ltq_rcu_usb2_phy_driver); + +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>"); +MODULE_DESCRIPTION("Lantiq XWAY USB2 PHY driver"); +MODULE_LICENSE("GPL v2"); -- 2.11.0 -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID (diff)
From: Hauke Mehrtens <hauke@hauke-m.de> To: ralf@linux-mips.org Cc: linux-mips@linux-mips.org, linux-mtd@lists.infradead.org, linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, martin.blumenstingl@googlemail.com, john@phrozen.org, linux-spi@vger.kernel.org, hauke.mehrtens@intel.com, robh@kernel.org, andy.shevchenko@gmail.com, p.zabel@pengutronix.de, Hauke Mehrtens <hauke@hauke-m.de>, Kishon Vijay Abraham I <kishon@ti.com> Subject: [PATCH v7 14/16] phy: Add an USB PHY driver for the Lantiq SoCs using the RCU module Date: Mon, 3 Jul 2017 00:40:49 +0200 [thread overview] Message-ID: <20170702224051.15109-15-hauke@hauke-m.de> (raw) In-Reply-To: <20170702224051.15109-1-hauke@hauke-m.de> This driver starts the DWC2 core(s) built into the XWAY SoCs and provides the PHY interfaces for each core. The phy instances can be passed to the dwc2 driver, which already supports the generic phy interface. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Cc: Kishon Vijay Abraham I <kishon@ti.com> --- .../bindings/phy/phy-lantiq-rcu-usb2.txt | 42 ++++ arch/mips/lantiq/xway/sysctrl.c | 24 +- drivers/phy/Kconfig | 8 + drivers/phy/Makefile | 1 + drivers/phy/phy-lantiq-rcu-usb2.c | 275 +++++++++++++++++++++ 5 files changed, 338 insertions(+), 12 deletions(-) create mode 100644 Documentation/devicetree/bindings/phy/phy-lantiq-rcu-usb2.txt create mode 100644 drivers/phy/phy-lantiq-rcu-usb2.c diff --git a/Documentation/devicetree/bindings/phy/phy-lantiq-rcu-usb2.txt b/Documentation/devicetree/bindings/phy/phy-lantiq-rcu-usb2.txt new file mode 100644 index 000000000000..c538baa2ba54 --- /dev/null +++ b/Documentation/devicetree/bindings/phy/phy-lantiq-rcu-usb2.txt @@ -0,0 +1,42 @@ +Lantiq XWAY SoC RCU USB 1.1/2.0 PHY binding +=========================================== + +This binding describes the USB PHY hardware provided by the RCU module on the +Lantiq XWAY SoCs. + +This driver has to be a sub node of the Lantiq RCU block. + +------------------------------------------------------------------------------- +Required properties (controller (parent) node): +- compatible : Should be one of + "lantiq,ase-usb2-phy" + "lantiq,danube-usb2-phy" + "lantiq,xrx100-usb2-phy" + "lantiq,xrx200-usb2-phy" + "lantiq,xrx300-usb2-phy" +- offset-phy : Offset of the USB PHY configuration register +- offset-ana : Offset of the USB Analog configuration register +- clocks : References to the (PMU) "ctrl" and "phy" clk gates. +- clock-names : Must be one of the following: + "ctrl" + "phy" +- resets : References to the RCU USB configuration reset bits. +- reset-names : Must be one of the following: + "phy" (optional) + "ctrl" (shared) + +------------------------------------------------------------------------------- +Example for the USB PHYs on an xRX200 SoC: + usb_phy0: usb2-phy@18 { + compatible = "lantiq,xrx200-usb2-phy"; + reg = <0x18 4>, <0x38 4>; + + offset-phy = <0x18>; + offset-ana = <0x38>; + clocks = <&pmu PMU_GATE_USB0_CTRL>, + <&pmu PMU_GATE_USB0_PHY>; + clock-names = "ctrl", "phy"; + resets = <&reset1 4 4>, <&reset0 4 4>; + reset-names = "phy", "ctrl"; + #phy-cells = <0>; + }; diff --git a/arch/mips/lantiq/xway/sysctrl.c b/arch/mips/lantiq/xway/sysctrl.c index 87eab4d288e5..f76978e4da32 100644 --- a/arch/mips/lantiq/xway/sysctrl.c +++ b/arch/mips/lantiq/xway/sysctrl.c @@ -469,8 +469,8 @@ void __init ltq_soc_init(void) if (of_machine_is_compatible("lantiq,grx390") || of_machine_is_compatible("lantiq,ar10")) { - clkdev_add_pmu("1e101000.usb", "phy", 1, 2, PMU_ANALOG_USB0_P); - clkdev_add_pmu("1e106000.usb", "phy", 1, 2, PMU_ANALOG_USB1_P); + clkdev_add_pmu("1f203018.usb2-phy", "phy", 1, 2, PMU_ANALOG_USB0_P); + clkdev_add_pmu("1f203034.usb2-phy", "phy", 1, 2, PMU_ANALOG_USB1_P); /* rc 0 */ clkdev_add_pmu("1d900000.pcie", "phy", 1, 2, PMU_ANALOG_PCIE0_P); clkdev_add_pmu("1d900000.pcie", "msi", 1, 1, PMU1_PCIE_MSI); @@ -490,8 +490,8 @@ void __init ltq_soc_init(void) else clkdev_add_static(CLOCK_133M, CLOCK_133M, CLOCK_133M, CLOCK_133M); - clkdev_add_pmu("1e101000.usb", "ctl", 1, 0, PMU_USB0); - clkdev_add_pmu("1e101000.usb", "phy", 1, 0, PMU_USB0_P); + clkdev_add_pmu("1f203018.usb2-phy", "ctrl", 1, 0, PMU_USB0); + clkdev_add_pmu("1f203018.usb2-phy", "phy", 1, 0, PMU_USB0_P); clkdev_add_pmu("1e180000.etop", "ppe", 1, 0, PMU_PPE); clkdev_add_cgu("1e180000.etop", "ephycgu", CGU_EPHY); clkdev_add_pmu("1e180000.etop", "ephy", 1, 0, PMU_EPHY); @@ -526,10 +526,10 @@ void __init ltq_soc_init(void) } else if (of_machine_is_compatible("lantiq,vr9")) { clkdev_add_static(ltq_vr9_cpu_hz(), ltq_vr9_fpi_hz(), ltq_vr9_fpi_hz(), ltq_vr9_pp32_hz()); - clkdev_add_pmu("1e101000.usb", "phy", 1, 0, PMU_USB0_P); - clkdev_add_pmu("1e101000.usb", "ctl", 1, 0, PMU_USB0 | PMU_AHBM); - clkdev_add_pmu("1e106000.usb", "phy", 1, 0, PMU_USB1_P); - clkdev_add_pmu("1e106000.usb", "ctl", 1, 0, PMU_USB1 | PMU_AHBM); + clkdev_add_pmu("1f203018.usb2-phy", "phy", 1, 0, PMU_USB0_P); + clkdev_add_pmu("1f203018.usb2-phy", "ctrl", 1, 0, PMU_USB0 | PMU_AHBM); + clkdev_add_pmu("1f203034.usb2-phy", "phy", 1, 0, PMU_USB1_P); + clkdev_add_pmu("1f203034.usb2-phy", "ctrl", 1, 0, PMU_USB1 | PMU_AHBM); clkdev_add_pmu("1d900000.pcie", "phy", 1, 1, PMU1_PCIE_PHY); clkdev_add_pmu("1d900000.pcie", "bus", 1, 0, PMU_PCIE_CLK); clkdev_add_pmu("1d900000.pcie", "msi", 1, 1, PMU1_PCIE_MSI); @@ -550,8 +550,8 @@ void __init ltq_soc_init(void) } else if (of_machine_is_compatible("lantiq,ar9")) { clkdev_add_static(ltq_ar9_cpu_hz(), ltq_ar9_fpi_hz(), ltq_ar9_fpi_hz(), CLOCK_250M); - clkdev_add_pmu("1e101000.usb", "ctl", 1, 0, PMU_USB0); - clkdev_add_pmu("1e101000.usb", "phy", 1, 0, PMU_USB0_P); + clkdev_add_pmu("1f203018.usb2-phy", "ctrl", 1, 0, PMU_USB0); + clkdev_add_pmu("1f203018.usb2-phy", "phy", 1, 0, PMU_USB0_P); clkdev_add_pmu("1e106000.usb", "ctl", 1, 0, PMU_USB1); clkdev_add_pmu("1e106000.usb", "phy", 1, 0, PMU_USB1_P); clkdev_add_pmu("1e180000.etop", "switch", 1, 0, PMU_SWITCH); @@ -562,8 +562,8 @@ void __init ltq_soc_init(void) } else { clkdev_add_static(ltq_danube_cpu_hz(), ltq_danube_fpi_hz(), ltq_danube_fpi_hz(), ltq_danube_pp32_hz()); - clkdev_add_pmu("1e101000.usb", "ctl", 1, 0, PMU_USB0); - clkdev_add_pmu("1e101000.usb", "phy", 1, 0, PMU_USB0_P); + clkdev_add_pmu("1f203018.usb2-phy", "ctrl", 1, 0, PMU_USB0); + clkdev_add_pmu("1f203018.usb2-phy", "phy", 1, 0, PMU_USB0_P); clkdev_add_pmu("1e103000.sdio", NULL, 1, 0, PMU_SDIO); clkdev_add_pmu("1e103100.deu", NULL, 1, 0, PMU_DEU); clkdev_add_pmu("1e116000.mei", "dfe", 1, 0, PMU_DFE); diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index afaf7b643eeb..f7f6bfca20fc 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -507,6 +507,14 @@ config PHY_CYGNUS_PCIE Enable this to support the Broadcom Cygnus PCIe PHY. If unsure, say N. +config PHY_LANTIQ_RCU_USB2 + tristate "Lantiq XWAY SoC RCU based USB PHY" + depends on SOC_TYPE_XWAY + depends on OF + select GENERIC_PHY + help + Support for the USB PHY(s) on the Lantiq XWAY family SoCs. + source "drivers/phy/tegra/Kconfig" config PHY_NS2_PCIE diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index f8047b4639fa..d6ba19233001 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -61,6 +61,7 @@ obj-$(CONFIG_PHY_TUSB1210) += phy-tusb1210.o obj-$(CONFIG_PHY_BRCM_SATA) += phy-brcm-sata.o obj-$(CONFIG_PHY_PISTACHIO_USB) += phy-pistachio-usb.o obj-$(CONFIG_PHY_CYGNUS_PCIE) += phy-bcm-cygnus-pcie.o +obj-$(CONFIG_PHY_LANTIQ_RCU_USB2) += phy-lantiq-rcu-usb2.o obj-$(CONFIG_ARCH_TEGRA) += tegra/ obj-$(CONFIG_PHY_NS2_PCIE) += phy-bcm-ns2-pcie.o obj-$(CONFIG_PHY_MESON8B_USB2) += phy-meson8b-usb2.o diff --git a/drivers/phy/phy-lantiq-rcu-usb2.c b/drivers/phy/phy-lantiq-rcu-usb2.c new file mode 100644 index 000000000000..9cde229f108f --- /dev/null +++ b/drivers/phy/phy-lantiq-rcu-usb2.c @@ -0,0 +1,275 @@ +/* + * Lantiq XWAY SoC RCU module based USB 1.1/2.0 PHY driver + * + * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com> + * Copyright (C) 2017 Hauke Mehrtens <hauke@hauke-m.de> + * + * 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/clk.h> +#include <linux/delay.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/property.h> +#include <linux/regmap.h> +#include <linux/reset.h> + +/* Transmitter HS Pre-Emphasis Enable */ +#define RCU_CFG1_TX_PEE BIT(0) +/* Disconnect Threshold */ +#define RCU_CFG1_DIS_THR_MASK 0x00038000 +#define RCU_CFG1_DIS_THR_SHIFT 15 + +struct ltq_rcu_usb2_bits { + u8 hostmode; + u8 slave_endianness; + u8 host_endianness; + bool have_ana_cfg; +}; + +struct ltq_rcu_usb2_priv { + struct regmap *regmap; + u32 phy_reg_offset; + u32 ana_cfg1_reg_offset; + const struct ltq_rcu_usb2_bits *reg_bits; + struct device *dev; + struct phy *phy; + struct clk *ctrl_gate_clk; + struct clk *phy_gate_clk; + struct reset_control *ctrl_reset; + struct reset_control *phy_reset; +}; + +static const struct ltq_rcu_usb2_bits xway_rcu_usb2_reg_bits = { + .hostmode = 11, + .slave_endianness = 9, + .host_endianness = 10, + .have_ana_cfg = false, +}; + +static const struct ltq_rcu_usb2_bits xrx100_rcu_usb2_reg_bits = { + .hostmode = 11, + .slave_endianness = 17, + .host_endianness = 10, + .have_ana_cfg = false, +}; + +static const struct ltq_rcu_usb2_bits xrx200_rcu_usb2_reg_bits = { + .hostmode = 11, + .slave_endianness = 9, + .host_endianness = 10, + .have_ana_cfg = true, +}; + +static const struct of_device_id ltq_rcu_usb2_phy_of_match[] = { + { + .compatible = "lantiq,ase-usb2-phy", + .data = &xway_rcu_usb2_reg_bits, + }, + { + .compatible = "lantiq,danube-usb2-phy", + .data = &xway_rcu_usb2_reg_bits, + }, + { + .compatible = "lantiq,xrx100-usb2-phy", + .data = &xrx100_rcu_usb2_reg_bits, + }, + { + .compatible = "lantiq,xrx200-usb2-phy", + .data = &xrx200_rcu_usb2_reg_bits, + }, + { + .compatible = "lantiq,xrx300-usb2-phy", + .data = &xrx200_rcu_usb2_reg_bits, + }, + { }, +}; +MODULE_DEVICE_TABLE(of, ltq_rcu_usb2_phy_of_match); + + +static int ltq_rcu_usb2_phy_power_on(struct phy *phy) +{ + struct ltq_rcu_usb2_priv *priv = phy_get_drvdata(phy); + + reset_control_deassert(priv->phy_reset); + + return 0; +} + +static int ltq_rcu_usb2_phy_power_off(struct phy *phy) +{ + struct ltq_rcu_usb2_priv *priv = phy_get_drvdata(phy); + + reset_control_assert(priv->phy_reset); + + return 0; +} + +static struct phy_ops ltq_rcu_usb2_phy_ops = { + .power_on = ltq_rcu_usb2_phy_power_on, + .power_off = ltq_rcu_usb2_phy_power_off, + .owner = THIS_MODULE, +}; + +static int ltq_rcu_usb2_start_cores(struct ltq_rcu_usb2_priv *priv) +{ + struct device *dev = priv->dev; + int ret; + + /* Power on the USB core. */ + ret = clk_prepare_enable(priv->ctrl_gate_clk); + if (ret) { + dev_err(dev, "failed to enable CTRL gate\n"); + return ret; + } + + /* + * Power on the USB PHY. We have to do it early because + * otherwise the second core won't turn on properly. + */ + ret = clk_prepare_enable(priv->phy_gate_clk); + if (ret) { + clk_disable_unprepare(priv->ctrl_gate_clk); + dev_err(dev, "failed to enable PHY gate\n"); + return ret; + } + + if (priv->reg_bits->have_ana_cfg) { + regmap_update_bits(priv->regmap, priv->ana_cfg1_reg_offset, + RCU_CFG1_TX_PEE, RCU_CFG1_TX_PEE); + regmap_update_bits(priv->regmap, priv->ana_cfg1_reg_offset, + RCU_CFG1_DIS_THR_MASK, 7 << RCU_CFG1_DIS_THR_SHIFT); + } + + /* Configure core to host mode */ + regmap_update_bits(priv->regmap, priv->phy_reg_offset, + BIT(priv->reg_bits->hostmode), 0); + + /* Select DMA endianness (Host-endian: big-endian) */ + regmap_update_bits(priv->regmap, priv->phy_reg_offset, + BIT(priv->reg_bits->slave_endianness), 0); + regmap_update_bits(priv->regmap, priv->phy_reg_offset, + BIT(priv->reg_bits->host_endianness), + BIT(priv->reg_bits->host_endianness)); + + /* Reset USB core throgh reset controller */ + reset_control_deassert(priv->ctrl_reset); + + reset_control_assert(priv->phy_reset); + + return 0; +} + +static int ltq_rcu_usb2_of_probe(struct ltq_rcu_usb2_priv *priv) +{ + struct device *dev = priv->dev; + int ret; + + priv->reg_bits = of_device_get_match_data(dev); + + priv->regmap = syscon_node_to_regmap(dev->of_node->parent); + if (IS_ERR(priv->regmap)) { + dev_err(dev, "Failed to lookup RCU regmap\n"); + return PTR_ERR(priv->regmap); + } + + priv->ctrl_gate_clk = devm_clk_get(dev, "ctrl"); + if (IS_ERR(priv->ctrl_gate_clk)) { + dev_err(dev, "Unable to get USB ctrl gate clk\n"); + return PTR_ERR(priv->ctrl_gate_clk); + } + + priv->phy_gate_clk = devm_clk_get(dev, "phy"); + if (IS_ERR(priv->phy_gate_clk)) { + dev_err(dev, "Unable to get USB phy gate clk\n"); + return PTR_ERR(priv->phy_gate_clk); + } + + priv->ctrl_reset = devm_reset_control_get_shared(dev, "ctrl"); + if (IS_ERR(priv->ctrl_reset)) { + if (PTR_ERR(priv->ctrl_reset) != -EPROBE_DEFER) + dev_err(dev, "failed to get 'ctrl' reset\n"); + return PTR_ERR(priv->ctrl_reset); + } + + priv->phy_reset = devm_reset_control_get_optional(dev, "phy"); + if (IS_ERR(priv->phy_reset)) + return PTR_ERR(priv->phy_reset); + + ret = device_property_read_u32(dev, "offset-phy", + &priv->phy_reg_offset); + if (ret) { + dev_err(dev, "Failed to get RCU PHY reg offset\n"); + return ret; + } + + ret = device_property_read_u32(dev, "offset-ana", + &priv->ana_cfg1_reg_offset); + if (ret && priv->reg_bits->have_ana_cfg) { + dev_dbg(dev, "Failed to get RCU ANA CFG1 reg offset\n"); + return ret; + } + + return 0; +} + +static int ltq_rcu_usb2_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct ltq_rcu_usb2_priv *priv; + struct phy_provider *provider; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = dev; + + ret = ltq_rcu_usb2_of_probe(priv); + if (ret) + return ret; + + priv->phy = devm_phy_create(dev, dev->of_node, <q_rcu_usb2_phy_ops); + if (IS_ERR(priv->phy)) { + dev_err(dev, "failed to create PHY\n"); + return PTR_ERR(priv->phy); + } + + phy_set_drvdata(priv->phy, priv); + + ret = ltq_rcu_usb2_start_cores(priv); + if (ret) + return ret; + + provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + if (IS_ERR(provider)) { + clk_disable_unprepare(priv->phy_gate_clk); + clk_disable_unprepare(priv->ctrl_gate_clk); + return PTR_ERR(provider); + } + + dev_set_drvdata(priv->dev, priv); + return 0; +} + +static struct platform_driver ltq_rcu_usb2_phy_driver = { + .probe = ltq_rcu_usb2_phy_probe, + .driver = { + .name = "lantiq-rcu-usb2-phy", + .of_match_table = ltq_rcu_usb2_phy_of_match, + } +}; +module_platform_driver(ltq_rcu_usb2_phy_driver); + +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>"); +MODULE_DESCRIPTION("Lantiq XWAY USB2 PHY driver"); +MODULE_LICENSE("GPL v2"); -- 2.11.0
next prev parent reply other threads:[~2017-07-02 22:40 UTC|newest] Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-07-02 22:40 [PATCH v7 00/16] MIPS: lantiq: handle RCU register by separate drivers Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens [not found] ` <20170702224051.15109-1-hauke-5/S+JYg5SzeELgA04lAiVw@public.gmane.org> 2017-07-02 22:40 ` [PATCH v7 01/16] MIPS: lantiq: Use of_platform_default_populate instead of __dt_register_buses Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens 2017-07-02 22:40 ` [PATCH v7 02/16] mtd: lantiq-flash: drop check of boot select Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens 2017-07-02 22:40 ` [PATCH v7 03/16] mtd: spi-falcon: " Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens 2017-07-02 22:40 ` [PATCH v7 04/16] watchdog: lantiq: access boot cause register through regmap Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens 2017-07-02 22:40 ` [PATCH v7 05/16] watchdog: lantiq: add device tree binding documentation Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens [not found] ` <20170702224051.15109-6-hauke-5/S+JYg5SzeELgA04lAiVw@public.gmane.org> 2017-07-07 14:08 ` Rob Herring 2017-07-07 14:08 ` Rob Herring 2017-07-07 19:01 ` Hauke Mehrtens 2017-07-07 19:01 ` Hauke Mehrtens [not found] ` <704b3b8b-3f33-3d51-82d7-a9515fc39742-5/S+JYg5SzeELgA04lAiVw@public.gmane.org> 2017-07-07 20:18 ` Rob Herring 2017-07-07 20:18 ` Rob Herring 2017-07-02 22:40 ` [PATCH v7 06/16] MIPS: lantiq: Enable MFD_SYSCON to be able to use it for the RCU MFD Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens 2017-07-02 22:40 ` [PATCH v7 07/16] Documentation: DT: MIPS: lantiq: Add docs for the RCU bindings Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens [not found] ` <20170702224051.15109-8-hauke-5/S+JYg5SzeELgA04lAiVw@public.gmane.org> 2017-07-07 14:10 ` Rob Herring 2017-07-07 14:10 ` Rob Herring 2017-07-02 22:40 ` [PATCH v7 08/16] MIPS: lantiq: Convert the fpi bus driver to a platform_driver Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens [not found] ` <20170702224051.15109-9-hauke-5/S+JYg5SzeELgA04lAiVw@public.gmane.org> 2017-07-03 7:45 ` Andy Shevchenko 2017-07-03 7:45 ` Andy Shevchenko 2017-07-07 14:11 ` Rob Herring 2017-07-07 14:11 ` Rob Herring 2017-07-02 22:40 ` [PATCH v7 09/16] MIPS: lantiq: remove ltq_reset_cause() and ltq_boot_select() Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens 2017-07-02 22:40 ` [PATCH v7 10/16] reset: Add a reset controller driver for the Lantiq XWAY based SoCs Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens [not found] ` <20170702224051.15109-11-hauke-5/S+JYg5SzeELgA04lAiVw@public.gmane.org> 2017-07-03 7:51 ` Andy Shevchenko 2017-07-03 7:51 ` Andy Shevchenko [not found] ` <CAHp75VexwnVsb-ojXaZDN7QPVRKUeP-R=5C+j5ZSkE37Dtyp1Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2017-07-03 21:30 ` Hauke Mehrtens 2017-07-03 21:30 ` Hauke Mehrtens [not found] ` <e1160f30-eeff-3db2-884c-9cd4af35a37d-5/S+JYg5SzeELgA04lAiVw@public.gmane.org> 2017-07-04 8:30 ` Philipp Zabel 2017-07-04 8:30 ` Philipp Zabel 2017-07-04 8:30 ` Philipp Zabel 2017-07-07 14:17 ` Rob Herring 2017-07-07 14:17 ` Rob Herring 2017-07-07 14:16 ` Rob Herring 2017-07-07 14:16 ` Rob Herring 2017-07-02 22:40 ` [PATCH v7 11/16] MIPS: lantiq: remove old reset controller implementation Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens 2017-07-02 22:40 ` [PATCH v7 12/16] MIPS: lantiq: Add a GPHY driver which uses the RCU syscon-mfd Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens 2017-07-02 22:40 ` [PATCH v7 13/16] MIPS: lantiq: remove old GPHY loader code Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens [this message] 2017-07-02 22:40 ` [PATCH v7 14/16] phy: Add an USB PHY driver for the Lantiq SoCs using the RCU module Hauke Mehrtens [not found] ` <20170702224051.15109-15-hauke-5/S+JYg5SzeELgA04lAiVw@public.gmane.org> 2017-07-07 14:23 ` Rob Herring 2017-07-07 14:23 ` Rob Herring 2017-07-07 18:49 ` Hauke Mehrtens 2017-07-07 18:49 ` Hauke Mehrtens [not found] ` <534b3592-2803-ac95-ad60-3cf5d1252413-5/S+JYg5SzeELgA04lAiVw@public.gmane.org> 2017-07-07 20:11 ` Rob Herring 2017-07-07 20:11 ` Rob Herring 2017-07-11 6:38 ` Kishon Vijay Abraham I 2017-07-11 6:38 ` Kishon Vijay Abraham I [not found] ` <30adb3f5-50b5-35e3-685f-9fe0fa8c31f8-l0cyMroinI0@public.gmane.org> 2017-07-11 21:16 ` Hauke Mehrtens 2017-07-11 21:16 ` Hauke Mehrtens 2017-07-02 22:40 ` [PATCH v7 15/16] MIPS: lantiq: remove old USB PHY initialisation Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens 2017-07-02 22:40 ` [PATCH v7 16/16] MIPS: lantiq: Remove the arch/mips/lantiq/xway/reset.c implementation Hauke Mehrtens 2017-07-02 22:40 ` Hauke Mehrtens
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