linux-kernel - Re: [PATCH v3 06/10] phy: qcom: Add M31 based eUSB2 PHY driver

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Message-ID: <kj5dyy7bclmkft7x4hdpzpo7n35cu5nkpksj47phb7jt5lceab@7fb5i6gluqwz>
Date: Wed, 26 Mar 2025 16:33:41 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Melody Olvera <quic_molvera@...cinc.com>
Cc: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 06/10] phy: qcom: Add M31 based eUSB2 PHY driver

On Mon, Mar 24, 2025 at 01:18:34PM -0700, Melody Olvera wrote:
> From: Wesley Cheng <quic_wcheng@...cinc.com>
> 
> SM8750 utilizes an eUSB2 PHY from M31.  Add the initialization
> sequences to bring it out of reset and into an operational state.  This
> differs to the M31 USB driver, in that the M31 eUSB2 driver will
> require a connection to an eUSB2 repeater.  This PHY driver will handle
> the initialization of the associated eUSB2 repeater when required.
> 
> Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
> Signed-off-by: Melody Olvera <quic_molvera@...cinc.com>
> ---
>  drivers/phy/qualcomm/Kconfig              |  10 +
>  drivers/phy/qualcomm/Makefile             |   1 +
>  drivers/phy/qualcomm/phy-qcom-m31-eusb2.c | 297 ++++++++++++++++++++++++++++++
>  3 files changed, 308 insertions(+)
> 
> diff --git a/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c b/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c
> new file mode 100644
> index 0000000000000000000000000000000000000000..b18aab968122683e2e87287a4b570321d376870a
> --- /dev/null
> +++ b/drivers/phy/qualcomm/phy-qcom-m31-eusb2.c
> @@ -0,0 +1,297 @@
> +// SPDX-License-Identifier: GPL-2.0+

GPL-2.0-only

> +/*
> + * Copyright (c) 2024-2025 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +#include <linux/slab.h>
> +
> +#include <linux/regulator/consumer.h>
> +
> +#define USB_PHY_UTMI_CTRL0		(0x3c)
> +
> +#define USB_PHY_UTMI_CTRL5		(0x50)
> +
> +#define USB_PHY_HS_PHY_CTRL_COMMON0	(0x54)
> +#define FSEL				GENMASK(6, 4)
> +#define FSEL_38_4_MHZ_VAL		(0x6)
> +
> +#define USB_PHY_HS_PHY_CTRL2		(0x64)
> +
> +#define USB_PHY_CFG0			(0x94)
> +#define USB_PHY_CFG1			(0x154)
> +
> +#define USB_PHY_FSEL_SEL		(0xb8)
> +
> +#define USB_PHY_XCFGI_39_32		(0x16c)
> +#define USB_PHY_XCFGI_71_64		(0x17c)
> +#define USB_PHY_XCFGI_31_24		(0x168)
> +#define USB_PHY_XCFGI_7_0		(0x15c)
> +
> +#define M31_EUSB_PHY_INIT_CFG(o, b, v)	\
> +{				\
> +	.off = o,		\
> +	.mask = b,		\
> +	.val = v,		\
> +}
> +
> +struct m31_phy_tbl_entry {
> +	u32 off;
> +	u32 mask;
> +	u32 val;
> +};
> +
> +struct m31_eusb2_priv_data {
> +	const struct m31_phy_tbl_entry	*setup_seq;
> +	unsigned int			setup_seq_nregs;
> +	const struct m31_phy_tbl_entry	*override_seq;
> +	unsigned int			override_seq_nregs;
> +	const struct m31_phy_tbl_entry	*reset_seq;
> +	unsigned int			reset_seq_nregs;
> +	unsigned int			fsel;
> +};
> +
> +static const struct m31_phy_tbl_entry m31_eusb2_setup_tbl[] = {
> +	M31_EUSB_PHY_INIT_CFG(USB_PHY_CFG0, BIT(1), 1),
> +	M31_EUSB_PHY_INIT_CFG(USB_PHY_UTMI_CTRL5, BIT(1), 1),
> +	M31_EUSB_PHY_INIT_CFG(USB_PHY_CFG1, BIT(0), 1),
> +	M31_EUSB_PHY_INIT_CFG(USB_PHY_FSEL_SEL, BIT(0), 1),

I suppose, we can not expect to have #defines for all used bitfields?

> +};
> +

[...]

> +
> +static const struct phy_ops m31eusb2_phy_gen_ops = {
> +	.init	= m31eusb2_phy_init,
> +	.exit	= m31eusb2_phy_exit,

I think, you have a missing .set_mode callback here.

> +	.owner	= THIS_MODULE,
> +};
> +
> +static int m31eusb2_phy_probe(struct platform_device *pdev)
> +{
> +	struct phy_provider *phy_provider;
> +	const struct m31_eusb2_priv_data *data;
> +	struct device *dev = &pdev->dev;
> +	struct m31eusb2_phy *phy;
> +	int ret;
> +
> +	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
> +	if (!phy)
> +		return -ENOMEM;
> +
> +	data = of_device_get_match_data(dev);

device_get_match_data()

> +	if (IS_ERR(data))
> +		return -EINVAL;
> +	phy->data = data;
> +

-- 
With best wishes
Dmitry