Hi Kishon, > From: Yoshihiro Shimoda > Sent: Monday, May 29, 2017 7:42 PM > > The USB 3.0 PHY modules of R-Car Gen3 SoCs have: > - Spread spectrum clock (ssc). > - Using USB 2.0 EXTAL clock instead of USB 3.0 clock. > - Enabling VBUS detection for usb3.0 peripheral. > > So, this driver supports these features. > > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> Would you review this patch? I confirmed this patch could be applied on the latest linux-phy.git / next branch. Best regards. Yoshihiro Shimoda > --- > This patch is based on the latest linux-phy.git / next branch and > "[PATCH v5 3/3] phy: Group vendor specific phy drivers" patch. > > I discussed with Geert-san about this driver on the ML: > https://patchwork.kernel.org/patch/9731759/ > > Changes from v2: > - Revise the device tree doc. > - Improve initialization method in rcar_gen3_phy_usb3_init(). > - remove some values from rcar_gen3_phy_usb3_match_table. > > Changes from v1: > - Changes from dev_info to dev_vdbg in rcar_gen3_phy_usb3_init(). > > .../devicetree/bindings/phy/rcar-gen3-phy-usb3.txt | 46 +++++ > MAINTAINERS | 4 +- > drivers/phy/renesas/Kconfig | 7 + > drivers/phy/renesas/Makefile | 1 + > drivers/phy/renesas/phy-rcar-gen3-usb3.c | 226 +++++++++++++++++++++ > 5 files changed, 282 insertions(+), 2 deletions(-) > create mode 100644 Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb3.txt > create mode 100644 drivers/phy/renesas/phy-rcar-gen3-usb3.c > > diff --git a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb3.txt > b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb3.txt > new file mode 100644 > index 0000000..f94cea4 > --- /dev/null > +++ b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb3.txt > @@ -0,0 +1,46 @@ > +* Renesas R-Car generation 3 USB 3.0 PHY > + > +This file provides information on what the device node for the R-Car generation > +3 USB 3.0 PHY contains. > +If you want to enable spread spectrum clock (ssc), you should use USB_EXTAL > +instead of USB3_CLK. However, if you don't want to these features, you don't > +need this driver. > + > +Required properties: > +- compatible: "renesas,r8a7795-usb3-phy" if the device is a part of an R8A7795 > + SoC. > + "renesas,r8a7796-usb3-phy" if the device is a part of an R8A7796 > + SoC. > + "renesas,rcar-gen3-usb3-phy" for a generic R-Car Gen3 compatible > + device. > + > + When compatible with the generic version, nodes must list the > + SoC-specific version corresponding to the platform first > + followed by the generic version. > + > +- reg: offset and length of the USB 3.0 PHY register block. > +- clocks: A list of phandles and clock-specifier pairs. > +- clock-names: Name of the clocks. > + - The funcional clock must be "usb3-if". > + - The usb3's external clock must be "usb3s_clk". > + - The usb2's external clock must be "usb_extal". If you want to use the ssc, > + the clock-frequency must not be 0. > +- #phy-cells: see phy-bindings.txt in the same directory, must be <0>. > + > +Optional properties: > +- renesas,ssc-range: Enable/disable spread spectrum clock (ssc) by using > + the following values as u32: > + - 0 (or the property doesn't exist): disable the ssc > + - 4980: enable the ssc as -4980 ppm > + - 4492: enable the ssc as -4492 ppm > + - 4003: enable the ssc as -4003 ppm > + > +Example (R-Car H3): > + > + usb-phy@e65ee000 { > + compatible = "renesas,r8a7795-usb3-phy", > + "renesas,rcar-gen3-usb3-phy"; > + reg = <0 0xe65ee000 0 0x90>; > + clocks = <&cpg CPG_MOD 328>, <&usb3s0_clk>, <&usb_extal>; > + clock-names = "usb3-if", "usb3s_clk", "usb_extal"; > + }; > diff --git a/MAINTAINERS b/MAINTAINERS > index a47d3da..d711d53 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -10829,11 +10829,11 @@ L: linux-iio@xxxxxxxxxxxxxxx > S: Supported > F: drivers/iio/adc/rcar_gyro_adc.c > > -RENESAS USB2 PHY DRIVER > +RENESAS USB PHY DRIVER > M: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> > L: linux-renesas-soc@xxxxxxxxxxxxxxx > S: Maintained > -F: drivers/phy/renesas/phy-rcar-gen3-usb2.c > +F: drivers/phy/renesas/phy-rcar-gen3-usb*.c > > RESET CONTROLLER FRAMEWORK > M: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx> > diff --git a/drivers/phy/renesas/Kconfig b/drivers/phy/renesas/Kconfig > index 432e271..4377064 100644 > --- a/drivers/phy/renesas/Kconfig > +++ b/drivers/phy/renesas/Kconfig > @@ -15,3 +15,10 @@ config PHY_RCAR_GEN3_USB2 > select GENERIC_PHY > help > Support for USB 2.0 PHY found on Renesas R-Car generation 3 SoCs. > + > +config PHY_RCAR_GEN3_USB3 > + tristate "Renesas R-Car generation 3 USB 3.0 PHY driver" > + depends on ARCH_RENESAS > + select GENERIC_PHY > + help > + Support for USB 3.0 PHY found on Renesas R-Car generation 3 SoCs. > diff --git a/drivers/phy/renesas/Makefile b/drivers/phy/renesas/Makefile > index 695241a..8b60259 100644 > --- a/drivers/phy/renesas/Makefile > +++ b/drivers/phy/renesas/Makefile > @@ -1,2 +1,3 @@ > obj-$(CONFIG_PHY_RCAR_GEN2) += phy-rcar-gen2.o > obj-$(CONFIG_PHY_RCAR_GEN3_USB2) += phy-rcar-gen3-usb2.o > +obj-$(CONFIG_PHY_RCAR_GEN3_USB3) += phy-rcar-gen3-usb3.o > diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb3.c b/drivers/phy/renesas/phy-rcar-gen3-usb3.c > new file mode 100644 > index 0000000..88c83c9 > --- /dev/null > +++ b/drivers/phy/renesas/phy-rcar-gen3-usb3.c > @@ -0,0 +1,226 @@ > +/* > + * Renesas R-Car Gen3 for USB3.0 PHY driver > + * > + * Copyright (C) 2017 Renesas Electronics Corporation > + * > + * 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/io.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/phy/phy.h> > +#include <linux/platform_device.h> > +#include <linux/pm_runtime.h> > + > +#define USB30_CLKSET0 0x034 > +#define USB30_CLKSET1 0x036 > +#define USB30_SSC_SET 0x038 > +#define USB30_PHY_ENABLE 0x060 > +#define USB30_VBUS_EN 0x064 > + > +/* USB30_CLKSET0 */ > +#define CLKSET0_PRIVATE 0x05c0 > +#define CLKSET0_USB30_FSEL_USB_EXTAL 0x0002 > + > +/* USB30_CLKSET1 */ > +#define CLKSET1_USB30_PLL_MULTI_SHIFT 6 > +#define CLKSET1_USB30_PLL_MULTI_USB_EXTAL (0x64 << \ > + CLKSET1_USB30_PLL_MULTI_SHIFT) > +#define CLKSET1_PHYRESET BIT(4) /* 1: reset */ > +#define CLKSET1_REF_CLKDIV BIT(3) /* 1: USB_EXTAL */ > +#define CLKSET1_PRIVATE_2_1 BIT(1) /* Write B'01 */ > +#define CLKSET1_REF_CLK_SEL BIT(0) /* 1: USB3S0_CLK_P */ > + > +/* USB30_SSC_SET */ > +#define SSC_SET_SSC_EN BIT(12) > +#define SSC_SET_RANGE_SHIFT 9 > +#define SSC_SET_RANGE_4980 (0x0 << SSC_SET_RANGE_SHIFT) > +#define SSC_SET_RANGE_4492 (0x1 << SSC_SET_RANGE_SHIFT) > +#define SSC_SET_RANGE_4003 (0x2 << SSC_SET_RANGE_SHIFT) > + > +/* USB30_PHY_ENABLE */ > +#define PHY_ENABLE_RESET_EN BIT(4) > + > +/* USB30_VBUS_EN */ > +#define VBUS_EN_VBUS_EN BIT(1) > + > +struct rcar_gen3_usb3 { > + void __iomem *base; > + struct phy *phy; > + u32 ssc_range; > + bool usb3s_clk; > + bool usb_extal; > +}; > + > +static void write_clkset1_for_usb_extal(struct rcar_gen3_usb3 *r, bool reset) > +{ > + u16 val = CLKSET1_USB30_PLL_MULTI_USB_EXTAL | > + CLKSET1_REF_CLKDIV | CLKSET1_PRIVATE_2_1; > + > + if (reset) > + val |= CLKSET1_PHYRESET; > + > + writew(val, r->base + USB30_CLKSET1); > +} > + > +static void rcar_gen3_phy_usb3_enable_ssc(struct rcar_gen3_usb3 *r) > +{ > + u16 val = SSC_SET_SSC_EN; > + > + switch (r->ssc_range) { > + case 4980: > + val |= SSC_SET_RANGE_4980; > + break; > + case 4492: > + val |= SSC_SET_RANGE_4492; > + break; > + case 4003: > + val |= SSC_SET_RANGE_4003; > + break; > + default: > + dev_err(&r->phy->dev, "%s: unsupported range (%x)\n", __func__, > + r->ssc_range); > + return; > + } > + > + writew(val, r->base + USB30_SSC_SET); > +} > + > +static void rcar_gen3_phy_usb3_select_usb_extal(struct rcar_gen3_usb3 *r) > +{ > + write_clkset1_for_usb_extal(r, false); > + if (r->ssc_range) > + rcar_gen3_phy_usb3_enable_ssc(r); > + writew(CLKSET0_PRIVATE | CLKSET0_USB30_FSEL_USB_EXTAL, > + r->base + USB30_CLKSET0); > + writew(PHY_ENABLE_RESET_EN, r->base + USB30_PHY_ENABLE); > + write_clkset1_for_usb_extal(r, true); > + usleep_range(10, 20); > + write_clkset1_for_usb_extal(r, false); > +} > + > +static int rcar_gen3_phy_usb3_init(struct phy *p) > +{ > + struct rcar_gen3_usb3 *r = phy_get_drvdata(p); > + > + dev_vdbg(&r->phy->dev, "%s: enter (%d, %d, %d)\n", __func__, > + r->usb3s_clk, r->usb_extal, r->ssc_range); > + > + if (!r->usb3s_clk && r->usb_extal) > + rcar_gen3_phy_usb3_select_usb_extal(r); > + > + /* Enables VBUS detection anyway */ > + writew(VBUS_EN_VBUS_EN, r->base + USB30_VBUS_EN); > + > + return 0; > +} > + > +static const struct phy_ops rcar_gen3_phy_usb3_ops = { > + .init = rcar_gen3_phy_usb3_init, > + .owner = THIS_MODULE, > +}; > + > +static const struct of_device_id rcar_gen3_phy_usb3_match_table[] = { > + { .compatible = "renesas,rcar-gen3-usb3-phy" }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb3_match_table); > + > +static int rcar_gen3_phy_usb3_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct rcar_gen3_usb3 *r; > + struct phy_provider *provider; > + struct resource *res; > + int ret = 0; > + struct clk *clk; > + > + if (!dev->of_node) { > + dev_err(dev, "This driver needs device tree\n"); > + return -EINVAL; > + } > + > + r = devm_kzalloc(dev, sizeof(*r), GFP_KERNEL); > + if (!r) > + return -ENOMEM; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + r->base = devm_ioremap_resource(dev, res); > + if (IS_ERR(r->base)) > + return PTR_ERR(r->base); > + > + clk = devm_clk_get(dev, "usb3s_clk"); > + if (!IS_ERR(clk) && !clk_prepare_enable(clk)) { > + r->usb3s_clk = !!clk_get_rate(clk); > + clk_disable_unprepare(clk); > + } > + clk = devm_clk_get(dev, "usb_extal"); > + if (!IS_ERR(clk) && !clk_prepare_enable(clk)) { > + r->usb_extal = !!clk_get_rate(clk); > + clk_disable_unprepare(clk); > + } > + > + if (!r->usb3s_clk && !r->usb_extal) { > + dev_err(dev, "This driver needs usb3s_clk and/or usb_extal\n"); > + ret = -EINVAL; > + goto error; > + } > + > + /* > + * devm_phy_create() will call pm_runtime_enable(&phy->dev); > + * And then, phy-core will manage runtime pm for this device. > + */ > + pm_runtime_enable(dev); > + > + r->phy = devm_phy_create(dev, NULL, &rcar_gen3_phy_usb3_ops); > + if (IS_ERR(r->phy)) { > + dev_err(dev, "Failed to create USB3 PHY\n"); > + ret = PTR_ERR(r->phy); > + goto error; > + } > + > + of_property_read_u32(dev->of_node, "renesas,ssc-range", &r->ssc_range); > + > + platform_set_drvdata(pdev, r); > + phy_set_drvdata(r->phy, r); > + > + provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); > + if (IS_ERR(provider)) { > + dev_err(dev, "Failed to register PHY provider\n"); > + ret = PTR_ERR(provider); > + goto error; > + } > + > + return 0; > + > +error: > + pm_runtime_disable(dev); > + > + return ret; > +} > + > +static int rcar_gen3_phy_usb3_remove(struct platform_device *pdev) > +{ > + pm_runtime_disable(&pdev->dev); > + > + return 0; > +}; > + > +static struct platform_driver rcar_gen3_phy_usb3_driver = { > + .driver = { > + .name = "phy_rcar_gen3_usb3", > + .of_match_table = rcar_gen3_phy_usb3_match_table, > + }, > + .probe = rcar_gen3_phy_usb3_probe, > + .remove = rcar_gen3_phy_usb3_remove, > +}; > +module_platform_driver(rcar_gen3_phy_usb3_driver); > + > +MODULE_LICENSE("GPL v2"); > +MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 3.0 PHY"); > +MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>"); > -- > 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
