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Message-ID: <a2a87ae8-932a-4bc0-8c9c-f08bf109f0f2@kernel.org>
Date:   Wed, 1 Nov 2023 11:51:00 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Pu Li <pu.li@...soc.com>, Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     Zhiyong Liu <zhiyong.liu@...soc.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Orson Zhai <orsonzhai@...il.com>,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] phy: sprd: Add Spreadtrum usb20 hsphy driver

On 01/11/2023 06:44, Pu Li wrote:
> Add Spreadtrum platform USB20 HSPHY driver support. This driver
> takes care of all the PHY functionality, normally paired with
> DesignWare USB20 (DRD) Controller or Spreadtrum musb phy (DRD )controller.
> 
> Signed-off-by: Pu Li <pu.li@...soc.com>
> ---


> +
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/io.h>
> +#include <linux/iio/consumer.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/slab.h>
> +#include <linux/timer.h>
> +#include <linux/usb/otg.h>
> +#include <uapi/linux/usb/charger.h>
> +
> +#include "phy-sprd-usb20-hs.h"
> +
> +static const struct sprd_hsphy_cfg *phy_cfg;

File-scope variables do not look good.

> +

...

> +
> +static int sprd_hsphy_cali_mode(void)
> +{
> +	struct device_node *cmdline_node;
> +	const char *cmdline, *mode;
> +	int ret;
> +
> +	cmdline_node = of_find_node_by_path("/chosen");
> +	ret = of_property_read_string(cmdline_node, "bootargs", &cmdline);
> +
> +	if (ret) {
> +		pr_err("Can't not parse bootargs\n");
> +		return 0;
> +	}
> +
> +	mode = strstr(cmdline, "androidboot.mode=cali");

NAK, drop this nonsense.

> +	if (mode)
> +		return 1;
> +
> +	mode = strstr(cmdline, "sprdboot.mode=cali");

NAK, drop this nonsense.


> +	if (mode)
> +		return 1;
> +
> +	return 0;
> +}
> +
> +static int sprd_hsphy_probe(struct platform_device *pdev)
> +{
> +	struct sprd_hsphy *phy;
> +	struct resource *res;
> +	struct device *dev = &pdev->dev;
> +	int ret = 0, calimode = 0;
> +	struct usb_otg *otg;
> +
> +	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
> +	if (!phy)
> +		return -ENOMEM;
> +
> +	otg = devm_kzalloc(dev, sizeof(*otg), GFP_KERNEL);
> +	if (!otg)
> +		return -ENOMEM;
> +
> +	/* phy cfg data */
> +	phy_cfg = of_device_get_match_data(dev);
> +	if (!phy_cfg) {
> +		dev_err(dev, "no matching driver data found\n");
> +		return -EINVAL;
> +	}
> +
> +	/* set vdd */
> +	ret = of_property_read_u32(dev->of_node, "sprd,vdd-voltage",
> +				   &phy->vdd_vol);
> +	if (ret < 0) {
> +		dev_err(dev, "unable to read hsphy vdd voltage\n");
> +		return ret;
> +	}
> +
> +	calimode = sprd_hsphy_cali_mode();
> +	if (calimode) {
> +		phy->vdd_vol = phy_cfg->parameters[FULLSPEED_USB33_TUNE];
> +		dev_info(dev, "calimode vdd_vol:%d\n", phy->vdd_vol);
> +	}
> +
> +	phy->vdd = devm_regulator_get(dev, "vdd");
> +	if (IS_ERR(phy->vdd)) {
> +		dev_err(dev, "unable to get hsphy vdd supply\n");

You do not have regulators. You clearly did not test the code, DTS or
the bindings. Maybe nothing here was tested.

> +		return PTR_ERR(phy->vdd);

Syntax is anyway return dev_err_probe().

> +	}
> +
> +	ret = regulator_set_voltage(phy->vdd, phy->vdd_vol, phy->vdd_vol);
> +	if (ret < 0) {
> +		dev_err(dev, "fail to set hsphy vdd voltage at %dmV\n",
> +			phy->vdd_vol);
> +		return ret;
> +	}
> +
> +	/* phy tune */
> +	if (phy_cfg->phy_version == VERSION1) {
> +		ret = of_property_read_u32(dev->of_node, "sprd,tune-value",

Nope, it is not allowed in your bindings.

> +					&phy->phy_tune);
> +		if (ret < 0) {
> +			dev_err(dev, "unable to read hsphy usb phy tune\n");
> +			return ret;
> +		}
> +	}
> +
> +	/* phy base */
> +	if (phy_cfg->phy_version == VERSION1 ||
> +		phy_cfg->phy_version == VERSION2) {
> +		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_glb_regs");

This was not expressed in the bindings.

> +		if (!res) {
> +			dev_err(dev, "missing USB PHY registers resource\n");
> +			return -ENODEV;
> +		}
> +
> +		phy->base = devm_ioremap(dev, res->start, resource_size(res));
> +		if (IS_ERR(phy->base)) {
> +			dev_err(dev, "unable to get phy base!\n");
> +			return PTR_ERR(phy->base);
> +		}
> +	}
> +
> +	/* analog & aoapb & apahb regmap */
> +	phy->aon_apb = syscon_regmap_lookup_by_phandle(dev->of_node,
> +				 "sprd,syscon-enable");
> +	if (IS_ERR(phy->aon_apb)) {
> +		dev_err(dev, "USB aon apb syscon failed!\n");

return dev_err_probe, if it stays

> +		return PTR_ERR(phy->aon_apb);
> +	}
> +
> +	if (phy_cfg->phy_version == VERSION2) {


> +		phy->ap_ahb = syscon_regmap_lookup_by_phandle(dev->of_node,
> +				 "sprd,syscon-apahb");

NAK, there is no such property!

> +		if (IS_ERR(phy->ap_ahb)) {
> +			dev_err(dev, "USB apahb syscon failed!\n");

> +			return PTR_ERR(phy->ap_ahb);
> +		}
> +	}
> +
> +	if (phy_cfg->phy_version != VERSION1) {

This was not expressed in your bindings


> +		phy->analog = syscon_regmap_lookup_by_phandle(dev->of_node,
> +				 "sprd,syscon-ana");


> +		if (IS_ERR(phy->analog)) {
> +			dev_err(dev, "USB analog syscon failed!\n");
> +			return PTR_ERR(phy->analog);

return dev_err_probe, if it stays, but I insist to remove it.

> +		}
> +	}
> +
> +	/* prepare eye pattern */
> +	ret = sprd_eye_pattern_prepared(phy, dev);
> +	if (ret < 0)
> +		dev_warn(dev, "sprd_eye_pattern_prepared failed, ret = %d\n", ret);
> +
> +	/* enable usb module */
> +	if (phy_cfg->phy_version == VERSION2 ||
> +		phy_cfg->phy_version == VERSION3) {
> +		phy_cfg->cfg_ops->usb_enable_ctrl(phy, CTRL2);
> +	}
> +
> +	/* usb phy power down */
> +	if (phy_cfg->phy_version != VERSION4)
> +		phy_cfg->cfg_ops->usb_phy_power_ctrl(phy, CTRL2);
> +
> +	phy->dev = dev;
> +	phy->phy.dev = dev;
> +	phy->phy.label = "sprd-hsphy";
> +	phy->phy.otg = otg;
> +	phy->phy.init = sprd_hsphy_init;
> +	phy->phy.shutdown = sprd_hsphy_shutdown;
> +	phy->phy.set_vbus = sprd_hostphy_set;
> +	phy->phy.type = USB_PHY_TYPE_USB2;
> +	phy->phy.vbus_nb.notifier_call = sprd_hsphy_vbus_notify;
> +	otg->usb_phy = &phy->phy;
> +
> +	device_init_wakeup(phy->dev, true);
> +	phy->wake_lock = wakeup_source_register(phy->dev, "sprd-hsphy");
> +	if (!phy->wake_lock) {
> +		dev_err(dev, "fail to register wakeup lock.\n");
> +		return -ENOMEM;
> +	}
> +	INIT_WORK(&phy->work, sprd_hsphy_charger_detect_work);
> +	platform_set_drvdata(pdev, phy);
> +
> +	ret = usb_add_phy_dev(&phy->phy);
> +	if (ret) {
> +		dev_err(dev, "fail to add phy\n");
> +		return ret;
> +	}
> +
> +	ret = sysfs_create_groups(&dev->kobj, usb_hsphy_groups);
> +	if (ret)
> +		dev_warn(dev, "failed to create usb hsphy attributes\n");
> +
> +	if (extcon_get_state(phy->phy.edev, EXTCON_USB) > 0)
> +		usb_phy_set_charger_state(&phy->phy, USB_CHARGER_PRESENT);
> +
> +	dev_info(dev, "sprd usb phy probe ok !\n");

Drop. This code looks very, very poor :(. Lack of testing is even worse.

> +
> +	return ret;
> +}

...

> +static int __init sprd_hsphy_driver_init(void)
> +{
> +	return platform_driver_register(&sprd_hsphy_driver);
> +}
> +
> +static void __exit sprd_hsphy_driver_exit(void)
> +{
> +	platform_driver_unregister(&sprd_hsphy_driver);
> +}
> +
> +late_initcall(sprd_hsphy_driver_init);
> +module_exit(sprd_hsphy_driver_exit);
> +
> +MODULE_ALIAS("platform:spreadtrum-usb20-hsphy");

You should not need MODULE_ALIAS() in normal cases. If you need it,
usually it means your device ID table is wrong (e.g. misses either
entries or MODULE_DEVICE_TABLE()). MODULE_ALIAS() is not a substitute
for incomplete ID table.


> +MODULE_AUTHOR("Pu Li <lip308226@...il.com>");
> +MODULE_DESCRIPTION("Spreadtrum USB20 HSPHY driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/phy/sprd/phy-sprd-usb20-hs.h b/drivers/phy/sprd/phy-sprd-usb20-hs.h
> new file mode 100644
> index 000000000000..897ee5e64482
> --- /dev/null
> +++ b/drivers/phy/sprd/phy-sprd-usb20-hs.h
> @@ -0,0 +1,525 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * phy-sprd-usb20-hs.h - Spreadtrum usb20 phy Glue layer h file
> + *
> + * Copyright 2020-2023 Unisoc Inc.
> + */
> +
> +#ifndef __SPRD_USB20_HS_H
> +#define __SPRD_USB20_HS_H
> +
> +#include <linux/regmap.h>
> +#include <linux/usb/phy.h>
> +
> +struct sprd_hsphy {
> +	struct device		*dev;
> +	struct usb_phy		phy;
> +	void __iomem		*base;
> +	struct regulator	*vdd;
> +	struct regmap           *aon_apb;
> +	struct regmap           *ap_ahb;
> +	struct regmap           *analog;
> +	struct wakeup_source	*wake_lock;
> +	struct work_struct	work;
> +	unsigned long event;
> +	u32			vdd_vol;
> +	u32			phy_tune;
> +	u32			host_eye_pattern;
> +	u32			device_eye_pattern;
> +	u32			host_otg_ctrl0;
> +	u32			device_otg_ctrl0;
> +	u32			host_otg_ctrl1;
> +	u32			device_otg_ctrl1;
> +	atomic_t		reset;
> +	atomic_t		inited;
> +	bool			is_host;
> +};
> +
> +enum hsphy_parameters {
> +	TUNEHSAMP_SHIFT,
> +	TUNEEQ_SHIFT,
> +	TFREGRES_SHIFT,
> +	FULLSPEED_USB33_TUNE,
> +};
> +
> +enum sprd_hsphy_reg_layout {
> +	REG_AON_APB_APB_RST1,
> +	REG_AON_APB_APB_RST2,
> +	REG_AON_APB_APB_EB1,
> +	REG_AON_APB_APB_EB2,
> +	REG_AON_APB_CGM_REG1,
> +	REG_AON_APB_OTG_PHY_TEST,
> +	REG_AON_APB_OTG_PHY_CTRL,
> +	REG_AON_APB_PWR_CTRL,
> +	REG_AON_APB_AON_SOC_USB_CTRL,
> +	REG_AON_APB_MIPI_CSI_POWER_CTRL,
> +	REG_AP_AHB_AHB_EB,
> +	REG_AP_AHB_AHB_RST,
> +	REG_AP_AHB_OTG_CTRL0,
> +	REG_AP_AHB_OTG_CTRL1,
> +	REG_AP_AHB_OTG_PHY_CTRL,
> +	REG_AP_AHB_OTG_PHY_TUNE,
> +	REG_AP_AHB_OTG_PHY_TEST,
> +	REG_ANALOG_USB20_USB20_ISO_SW,
> +	REG_ANALOG_USB20_USB20_BATTER_PLL,
> +	REG_ANALOG_USB20_USB20_UTMI_CTL1,
> +	REG_ANALOG_USB20_USB20_TRIMMING,
> +	REG_ANALOG_USB20_USB20_UTMI_CTL2,
> +	REG_ANALOG_USB20_REG_SEL_CFG_0,
> +	REG_ANALOG_USB20_IDDG,
> +	REG_ANALOG_USB20_USB20_PHY,
> +};
> +
> +enum sprd_hsphy_mask_layout {
> +	MASK_AON_APB_USB_PHY_PD_S,
> +	MASK_AON_APB_USB_PHY_PD_L,
> +	MASK_AON_APB_ANLG_APB_EB,
> +	MASK_AON_APB_ANLG_EB,
> +	MASK_AON_APB_OTG_REF_EB,
> +	MASK_AON_APB_ANA_EB,
> +	MASK_AON_APB_OTG_UTMI_EB,
> +	MASK_AON_APB_AON_USB2_TOP_EB,
> +	MASK_AON_APB_OTG_PHY_EB,
> +	MASK_AON_APB_CGM_OTG_REF_EN,
> +	MASK_AON_APB_CGM_DPHY_REF_EN,
> +	MASK_AON_APB_USB_ISO_SW_EN,
> +	MASK_AON_APB_OTG_PHY_SOFT_RST,
> +	MASK_AON_APB_OTG_UTMI_SOFT_RST,
> +	MASK_AON_APB_OTG_VBUS_VALID_PHYREG,
> +	MASK_AON_APB_USB2_PHY_IDDIG,
> +	MASK_AON_APB_UTMI_WIDTH_SEL,
> +	MASK_AON_APB_USB20_CTRL_MUX_REG,
> +	MASK_AON_APB_USB20_ISO_SW_EN,
> +	MASK_AON_APB_C2G_ANALOG_USB20_USB20_PS_PD_S,
> +	MASK_AON_APB_C2G_ANALOG_USB20_USB20_PS_PD_L,
> +	MASK_AP_AHB_OTG_EB,
> +	MASK_AP_AHB_OTG_PHY_SOFT_RST,
> +	MASK_AP_AHB_OTG_UTMI_SOFT_RST,
> +	MASK_AP_AHB_OTG_SOFT_RST,
> +	MASK_AP_AHB_USB2_PHY_IDDIG,
> +	MASK_AP_AHB_OTG_DPPULLDOWN,
> +	MASK_AP_AHB_OTG_DMPULLDOWN,
> +	MASK_AP_AHB_OTG_VBUS_VALID_EXT,
> +	MASK_AP_AHB_OTG_VBUS_VALID_PHYREG,
> +	MASK_AP_AHB_UTMI_WIDTH_SEL,
> +	MASK_AP_AHB_USB2_DATABUS16_8,
> +	MASK_AP_AHB_USB20_SAMPLER_SEL,
> +	MASK_AP_AHB_USB20_TUNEHSAMP,
> +	MASK_AP_AHB_USB20_TUNEEQ,
> +	MASK_AP_AHB_USB20_TFREGRES,
> +	MASK_ANALOG_USB20_USB20_VBUSVLDEXT,
> +	MASK_ANALOG_USB20_USB20_DATABUS16_8,
> +	MASK_DBG_SEL_ANALOG_USB20_USB20_DMPULLDOWN,
> +	MASK_DBG_SEL_ANALOG_USB20_USB20_DPPULLDOWN,
> +	MASK_ANALOG_USB20_USB20_DMPULLDOWN,
> +	MASK_ANALOG_USB20_USB20_DPPULLDOWN,
> +	MASK_ANALOG_USB20_UTMIOTG_IDDG,
> +	MASK_ANALOG_USB20_USB20_PS_PD_S,
> +	MASK_ANALOG_USB20_USB20_PS_PD_L,
> +	MASK_ANALOG_USB20_USB20_RESERVED,
> +	MASK_ANALOG_USB20_USB20_ISO_SW_EN,
> +	MASK_ANALOG_USB20_USB20_TUNEHSAMP,
> +	MASK_ANALOG_USB20_USB20_TUNEEQ,
> +	MASK_ANALOG_USB20_USB20_TFREGRES,
> +};
> +
> +enum {
> +	CTRL0 = 0,
> +	CTRL1,
> +	CTRL2,
> +};
> +
> +struct sprd_hsphy_cfg_ops {
> +	void (*usb_enable_ctrl)(struct sprd_hsphy *phy, int on);
> +	void (*usb_phy_power_ctrl)(struct sprd_hsphy *phy, int on);
> +	void (*usb_vbus_ctrl)(struct sprd_hsphy *phy, int on);
> +	void (*utmi_width_sel)(struct sprd_hsphy *phy);
> +	void (*reset_core)(struct sprd_hsphy *phy);
> +	int (*set_mode)(struct sprd_hsphy *phy, int on);
> +};
> +
> +enum hsphy_ip_version {
> +	VERSION1,
> +	VERSION2,
> +	VERSION3,
> +	VERSION4,
> +};
> +
> +enum hsphy_owner {
> +	PIKE2,
> +	SHARKLE,
> +	SHARKL3,
> +	SHARKL5,
> +	SHARKL5PRO,
> +	QOGIRL6,
> +	QOGIRN6LITE,
> +	UIS8520,
> +};
> +
> +struct sprd_hsphy_cfg {
> +	/* array of registers with different offsets */
> +	const unsigned int *regs;
> +
> +	const unsigned int *masks;
> +
> +	/* private ops for each SOC */
> +	const struct sprd_hsphy_cfg_ops *cfg_ops;
> +
> +	const unsigned int *parameters;
> +
> +	enum hsphy_ip_version phy_version;
> +
> +	enum hsphy_owner	owner;
> +};
> +
> +static const unsigned int pike2_regs_layout[] = {

Static data allocated in every unit including this header? No, this does
not look like correct code (yeah, it compiles but it is just wrong).

Best regards,
Krzysztof

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