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Message-ID: <aXB7GqQaxtgKReVa@vaman>
Date: Wed, 21 Jan 2026 12:37:06 +0530
From: Vinod Koul <vkoul@...nel.org>
To: Jiayu Du <jiayu.riscv@...c.iscas.ac.cn>
Cc: gregkh@...uxfoundation.org, conor@...nel.org, neil.armstrong@...aro.org,
robh@...nel.org, krzk+dt@...nel.org, pjw@...nel.org,
palmer@...belt.com, aou@...s.berkeley.edu, alex@...ti.fr,
linux-phy@...ts.infradead.org, linux-usb@...r.kernel.org,
devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/4] phy: usb: Add driver for Canaan K230 USB 2.0 PHY
On 20-01-26, 22:32, Jiayu Du wrote:
> Add driver for the USB 2.0 PHY in Canaan K230 SoC, which supports PHY
> initialization and power management.
>
> Add Kconfig/Makefile under drivers/phy/canaan/.
>
> Signed-off-by: Jiayu Du <jiayu.riscv@...c.iscas.ac.cn>
> ---
> drivers/phy/Kconfig | 1 +
> drivers/phy/Makefile | 1 +
> drivers/phy/canaan/Kconfig | 14 ++
> drivers/phy/canaan/Makefile | 2 +
> drivers/phy/canaan/phy-k230-usb.c | 283 ++++++++++++++++++++++++++++++
> 5 files changed, 301 insertions(+)
> create mode 100644 drivers/phy/canaan/Kconfig
> create mode 100644 drivers/phy/canaan/Makefile
> create mode 100644 drivers/phy/canaan/phy-k230-usb.c
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 142e7b0ef2ef..e37bcceef65a 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -150,6 +150,7 @@ source "drivers/phy/amlogic/Kconfig"
> source "drivers/phy/apple/Kconfig"
> source "drivers/phy/broadcom/Kconfig"
> source "drivers/phy/cadence/Kconfig"
> +source "drivers/phy/canaan/Kconfig"
> source "drivers/phy/freescale/Kconfig"
> source "drivers/phy/hisilicon/Kconfig"
> source "drivers/phy/ingenic/Kconfig"
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index dcbb060c8207..8cef0a447986 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -22,6 +22,7 @@ obj-y += allwinner/ \
> apple/ \
> broadcom/ \
> cadence/ \
> + canaan/ \
> freescale/ \
> hisilicon/ \
> ingenic/ \
> diff --git a/drivers/phy/canaan/Kconfig b/drivers/phy/canaan/Kconfig
> new file mode 100644
> index 000000000000..1ff8831846d5
> --- /dev/null
> +++ b/drivers/phy/canaan/Kconfig
> @@ -0,0 +1,14 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +#
> +# Phy drivers for Canaan platforms
> +#
> +config PHY_CANAAN_USB
> + tristate "Canaan USB2 PHY Driver"
> + depends on (ARCH_CANAAN || COMPILE_TEST) && OF
> + select GENERIC_PHY
> + help
> + Enable this driver to support the USB 2.0 PHY controller
> + on Canaan K230 RISC-V SoCs. This PHY controller
> + provides physical layer functionality for USB 2.0 devices.
> + If you have a Canaan K230 board and need USB 2.0 support,
> + say Y or M here.
> diff --git a/drivers/phy/canaan/Makefile b/drivers/phy/canaan/Makefile
> new file mode 100644
> index 000000000000..d73857ba284e
> --- /dev/null
> +++ b/drivers/phy/canaan/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0
> +obj-$(CONFIG_PHY_CANAAN_USB) += phy-k230-usb.o
> diff --git a/drivers/phy/canaan/phy-k230-usb.c b/drivers/phy/canaan/phy-k230-usb.c
> new file mode 100644
> index 000000000000..350950563f60
> --- /dev/null
> +++ b/drivers/phy/canaan/phy-k230-usb.c
> @@ -0,0 +1,283 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Canaan usb PHY driver
> + *
> + * Copyright (C) 2025 Jiayu Du <jiayu.riscv@...c.iscas.ac.cn>
2026 now!
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/io.h>
> +#include <linux/of_address.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +
> +#define MAX_PHYS 2
> +
> +/* Register offsets within the HiSysConfig system controller */
> +#define K230_USB0_TEST_REG_BASE 0x70
> +#define K230_USB0_CTL_REG_BASE 0xb0
> +#define K230_USB1_TEST_REG_BASE 0x90
> +#define K230_USB1_CTL_REG_BASE 0xb8
> +
> +/* Relative offsets within each PHY's control/test block */
> +#define CTL0_OFFSET 0x00
> +#define CTL1_OFFSET 0x04
> +#define TEST_CTL3_OFFSET 0x0c
> +
> +/* Bit definitions for TEST_CTL3 */
> +#define USB_IDPULLUP0 BIT(4)
> +#define USB_DMPULLDOWN0 BIT(8)
> +#define USB_DPPULLDOWN0 BIT(9)
> +
> +/* USB control register 0 in HiSysConfig system controller */
> +/* PLL Integral Path Tune */
> +#define USB_CTL0_PLLITUNE_MASK GENMASK(23, 22)
> +
> +/* PLL Proportional Path Tune */
> +#define USB_CTL0_PLLPTUNE_MASK GENMASK(21, 18)
> +
> +/* PLL Bandwidth Adjustment */
> +#define USB_CTL0_PLLBTUNE_MASK GENMASK(17, 17)
> +
> +/* VReg18 Bypass Control */
> +#define USB_CTL0_VREGBYPASS_MASK GENMASK(16, 16)
> +
> +/* Retention Mode Enable */
> +#define USB_CTL0_RETENABLEN_MASK GENMASK(15, 15)
> +
> +/* Reserved Request Input */
> +#define USB_CTL0_RESREQIN_MASK GENMASK(14, 14)
> +
> +/* External VBUS Valid Select */
> +#define USB_CTL0_VBUSVLDEXTSEL0_MASK GENMASK(13, 13)
> +
> +/* OTG Block Disable Control */
> +#define USB_CTL0_OTGDISABLE0_MASK GENMASK(12, 12)
> +
> +/* Drive VBUS Enable */
> +#define USB_CTL0_DRVVBUS0_MASK GENMASK(11, 11)
> +
> +/* Autoresume Mode Enable */
> +#define USB_CTL0_AUTORSMENB0_MASK GENMASK(10, 10)
> +
> +/* HS Transceiver Asynchronous Control */
> +#define USB_CTL0_HSXCVREXTCTL0_MASK GENMASK(9, 9)
> +
> +/* USB 1.1 Transmit Data */
> +#define USB_CTL0_FSDATAEXT0_MASK GENMASK(8, 8)
> +
> +/* USB 1.1 SE0 Generation */
> +#define USB_CTL0_FSSE0EXT0_MASK GENMASK(7, 7)
> +
> +/* USB 1.1 Data Enable */
> +#define USB_CTL0_TXENABLEN0_MASK GENMASK(6, 6)
> +
> +/* Disconnect Threshold */
> +#define USB_CTL0_COMPDISTUNE0_MASK GENMASK(5, 3)
> +
> +/* Squelch Threshold */
> +#define USB_CTL0_SQRXTUNE0_MASK GENMASK(2, 0)
> +
> +/* USB control register 1 in HiSysConfig system controller */
> +/* Data Detect Voltage */
> +#define USB_CTL1_VDATREFTUNE0_MASK GENMASK(23, 22)
> +
> +/* VBUS Valid Threshold */
> +#define USB_CTL1_OTGTUNE0_MASK GENMASK(21, 19)
> +
> +/* Transmitter High-Speed Crossover */
> +#define USB_CTL1_TXHSXVTUNE0_MASK GENMASK(18, 17)
> +
> +/* FS/LS Source Impedance */
> +#define USB_CTL1_TXFSLSTUNE0_MASK GENMASK(16, 13)
> +
> +/* HS DC Voltage Level */
> +#define USB_CTL1_TXVREFTUNE0_MASK GENMASK(12, 9)
> +
> +/* HS Transmitter Rise/Fall Time */
> +#define USB_CTL1_TXRISETUNE0_MASK GENMASK(8, 7)
> +
> +/* USB Source Impedance */
> +#define USB_CTL1_TXRESTUNE0_MASK GENMASK(6, 5)
> +
> +/* HS Transmitter Pre-Emphasis Current Control */
> +#define USB_CTL1_TXPREEMPAMPTUNE0_MASK GENMASK(4, 3)
> +
> +/* HS Transmitter Pre-Emphasis Duration Control */
> +#define USB_CTL1_TXPREEMPPULSETUNE0_MASK GENMASK(2, 2)
> +
> +/* charging detection */
> +#define USB_CTL1_CHRGSRCPUENB0_MASK GENMASK(1, 0)
> +
> +#define K230_PHY_CTL0_VAL \
> +( \
> + FIELD_PREP(USB_CTL0_PLLITUNE_MASK, 0x0) | \
> + FIELD_PREP(USB_CTL0_PLLPTUNE_MASK, 0xc) | \
> + FIELD_PREP(USB_CTL0_PLLBTUNE_MASK, 0x1) | \
> + FIELD_PREP(USB_CTL0_VREGBYPASS_MASK, 0x1) | \
> + FIELD_PREP(USB_CTL0_RETENABLEN_MASK, 0x1) | \
> + FIELD_PREP(USB_CTL0_RESREQIN_MASK, 0x0) | \
> + FIELD_PREP(USB_CTL0_VBUSVLDEXTSEL0_MASK, 0x0) | \
> + FIELD_PREP(USB_CTL0_OTGDISABLE0_MASK, 0x0) | \
> + FIELD_PREP(USB_CTL0_DRVVBUS0_MASK, 0x1) | \
> + FIELD_PREP(USB_CTL0_AUTORSMENB0_MASK, 0x0) | \
> + FIELD_PREP(USB_CTL0_HSXCVREXTCTL0_MASK, 0x0) | \
> + FIELD_PREP(USB_CTL0_FSDATAEXT0_MASK, 0x0) | \
> + FIELD_PREP(USB_CTL0_FSSE0EXT0_MASK, 0x0) | \
> + FIELD_PREP(USB_CTL0_TXENABLEN0_MASK, 0x0) | \
> + FIELD_PREP(USB_CTL0_COMPDISTUNE0_MASK, 0x3) | \
> + FIELD_PREP(USB_CTL0_SQRXTUNE0_MASK, 0x3) \
> +)
> +
> +#define K230_PHY_CTL1_VAL \
> +( \
> + FIELD_PREP(USB_CTL1_VDATREFTUNE0_MASK, 0x1) | \
> + FIELD_PREP(USB_CTL1_OTGTUNE0_MASK, 0x3) | \
> + FIELD_PREP(USB_CTL1_TXHSXVTUNE0_MASK, 0x3) | \
> + FIELD_PREP(USB_CTL1_TXFSLSTUNE0_MASK, 0x3) | \
> + FIELD_PREP(USB_CTL1_TXVREFTUNE0_MASK, 0x3) | \
> + FIELD_PREP(USB_CTL1_TXRISETUNE0_MASK, 0x1) | \
> + FIELD_PREP(USB_CTL1_TXRESTUNE0_MASK, 0x1) | \
> + FIELD_PREP(USB_CTL1_TXPREEMPAMPTUNE0_MASK, 0x0) | \
> + FIELD_PREP(USB_CTL1_TXPREEMPPULSETUNE0_MASK, 0x0) | \
> + FIELD_PREP(USB_CTL1_CHRGSRCPUENB0_MASK, 0x0) \
> +)
> +
> +struct k230_usb_phy_instance {
> + struct k230_usb_phy_global *global;
> + struct phy *phy;
> + u32 test_offset;
> + u32 ctl_offset;
> + int index;
> +};
> +
> +struct k230_usb_phy_global {
> + struct k230_usb_phy_instance phys[MAX_PHYS];
> + void __iomem *base;
> +};
> +
> +static int k230_usb_phy_power_on(struct phy *phy)
> +{
> + struct k230_usb_phy_instance *inst = phy_get_drvdata(phy);
> + struct k230_usb_phy_global *global = inst->global;
> + void __iomem *base = global->base;
> + u32 val;
blank line here please
> + /* Apply recommended settings */
> + writel(K230_PHY_CTL0_VAL, base + inst->ctl_offset + CTL0_OFFSET);
> + writel(K230_PHY_CTL1_VAL, base + inst->ctl_offset + CTL1_OFFSET);
> +
> + /* Configure test register (pull-ups/pull-downs) */
wrong alignment above, pls fix it
--
~Vinod
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