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Date: Wed, 16 Sep 2020 00:47:01 +0200
From: Paul Cercueil <paul@...pouillou.net>
To: 周琰杰 <zhouyanjie@...yeetech.com>
Cc: balbi@...nel.org, gregkh@...uxfoundation.org, kishon@...com,
vkoul@...nel.org, linux-kernel@...r.kernel.org,
linux-usb@...r.kernel.org, dongsheng.qiu@...enic.com,
aric.pzqi@...enic.com, rick.tyliu@...enic.com,
yanfei.li@...enic.com, sernia.zhou@...mail.com,
zhenwenjin@...il.com
Subject: Re: [PATCH v3 2/2] USB: PHY: JZ4770: Use the generic PHY framework.
Hi Zhou,
Le dim. 13 sept. 2020 à 14:34, 周琰杰 (Zhou Yanjie)
<zhouyanjie@...yeetech.com> a écrit :
> Used the generic PHY framework API to create the PHY,
> and move the driver to driver/phy/ingenic. And adjust
> the position of some codes to make it consistent with
> the style of other USB PHY drivers.
>
> Tested-by: 周正 (Zhou Zheng) <sernia.zhou@...mail.com>
> Co-developed-by: 漆鹏振 (Qi Pengzhen) <aric.pzqi@...enic.com>
> Signed-off-by: 漆鹏振 (Qi Pengzhen) <aric.pzqi@...enic.com>
> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>
> ---
>
> Notes:
> v1->v2:
> Fix bug, ".of_match_table =
> of_match_ptr(ingenic_usb_phy_of_matches)" is wrong
> and should be replaced with ".of_match_table =
> ingenic_usb_phy_of_matches".
>
> v2->v3:
> 1.Change "depends on (MACH_INGENIC && MIPS) || COMPILE_TEST" to
> "depends on MIPS || COMPILE_TEST".
> 2.Keep the adjustments of "ingenic_usb_phy_init()" and
> "ingenic_usb_phu_exit()"
> positions in v2 to make them consistent with the order in
> "ingenic_usb_phy_ops",
> keep the adjustments to the positions of
> "ingenic_usb_phy_of_matches[]" in v2
> to keep them consistent with the styles of other USB PHY
> drivers. And remove
> some unnecessary changes to reduce the diff size, from the
> original 256 lines
> change to the current 209 lines.
>
> drivers/phy/Kconfig | 1 +
> drivers/phy/Makefile | 1 +
> drivers/phy/ingenic/Kconfig | 12 ++
> drivers/phy/ingenic/Makefile | 2 +
> .../phy-jz4770.c => phy/ingenic/phy-ingenic-usb.c} | 209
> +++++++++++----------
> drivers/usb/phy/Kconfig | 8 -
> drivers/usb/phy/Makefile | 1 -
> 7 files changed, 128 insertions(+), 106 deletions(-)
> create mode 100644 drivers/phy/ingenic/Kconfig
> create mode 100644 drivers/phy/ingenic/Makefile
> rename drivers/{usb/phy/phy-jz4770.c =>
> phy/ingenic/phy-ingenic-usb.c} (71%)
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index de9362c25c07..0534b0fdd057 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -55,6 +55,7 @@ source "drivers/phy/broadcom/Kconfig"
> source "drivers/phy/cadence/Kconfig"
> source "drivers/phy/freescale/Kconfig"
> source "drivers/phy/hisilicon/Kconfig"
> +source "drivers/phy/ingenic/Kconfig"
> source "drivers/phy/lantiq/Kconfig"
> source "drivers/phy/marvell/Kconfig"
> source "drivers/phy/mediatek/Kconfig"
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index c27408e4daae..ab24f0d20763 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -14,6 +14,7 @@ obj-y += allwinner/ \
> cadence/ \
> freescale/ \
> hisilicon/ \
> + ingenic/ \
> intel/ \
> lantiq/ \
> marvell/ \
> diff --git a/drivers/phy/ingenic/Kconfig b/drivers/phy/ingenic/Kconfig
> new file mode 100644
> index 000000000000..912b14e512cb
> --- /dev/null
> +++ b/drivers/phy/ingenic/Kconfig
> @@ -0,0 +1,12 @@
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# Phy drivers for Ingenic platforms
> +#
> +config PHY_INGENIC_USB
> + tristate "Ingenic SoCs USB PHY Driver"
> + depends on MIPS || COMPILE_TEST
> + depends on USB_SUPPORT
> + select GENERIC_PHY
> + help
> + This driver provides USB PHY support for the USB controller found
> + on the JZ-series and X-series SoCs from Ingenic.
> diff --git a/drivers/phy/ingenic/Makefile
> b/drivers/phy/ingenic/Makefile
> new file mode 100644
> index 000000000000..65d5ea00fc9d
> --- /dev/null
> +++ b/drivers/phy/ingenic/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0
> +obj-y += phy-ingenic-usb.o
> diff --git a/drivers/usb/phy/phy-jz4770.c
> b/drivers/phy/ingenic/phy-ingenic-usb.c
> similarity index 71%
> rename from drivers/usb/phy/phy-jz4770.c
> rename to drivers/phy/ingenic/phy-ingenic-usb.c
> index 4025da20b3fd..1f2e811c9125 100644
> --- a/drivers/usb/phy/phy-jz4770.c
> +++ b/drivers/phy/ingenic/phy-ingenic-usb.c
> @@ -7,12 +7,12 @@
> */
>
> #include <linux/clk.h>
> +#include <linux/delay.h>
> #include <linux/io.h>
> #include <linux/module.h>
> #include <linux/platform_device.h>
> #include <linux/regulator/consumer.h>
> -#include <linux/usb/otg.h>
> -#include <linux/usb/phy.h>
> +#include <linux/phy/phy.h>
>
> /* OTGPHY register offsets */
> #define REG_USBPCR_OFFSET 0x00
> @@ -97,68 +97,56 @@ enum ingenic_usb_phy_version {
> struct ingenic_soc_info {
> enum ingenic_usb_phy_version version;
>
> - void (*usb_phy_init)(struct usb_phy *phy);
> + void (*usb_phy_init)(struct phy *phy);
> };
>
> -struct jz4770_phy {
> +struct ingenic_usb_phy {
> const struct ingenic_soc_info *soc_info;
>
> - struct usb_phy phy;
> - struct usb_otg otg;
> + struct phy *phy;
> struct device *dev;
> void __iomem *base;
> struct clk *clk;
> struct regulator *vcc_supply;
> };
>
> -static inline struct jz4770_phy *otg_to_jz4770_phy(struct usb_otg
> *otg)
> +static int ingenic_usb_phy_init(struct phy *phy)
> {
> - return container_of(otg, struct jz4770_phy, otg);
> -}
> -
> -static inline struct jz4770_phy *phy_to_jz4770_phy(struct usb_phy
> *phy)
> -{
> - return container_of(phy, struct jz4770_phy, phy);
> -}
> -
> -static int ingenic_usb_phy_set_peripheral(struct usb_otg *otg,
> - struct usb_gadget *gadget)
> -{
> - struct jz4770_phy *priv = otg_to_jz4770_phy(otg);
> + struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> + int err;
> u32 reg;
>
> - if (priv->soc_info->version >= ID_X1000) {
> - reg = readl(priv->base + REG_USBPCR1_OFFSET);
> - reg |= USBPCR1_BVLD_REG;
> - writel(reg, priv->base + REG_USBPCR1_OFFSET);
> + err = clk_prepare_enable(priv->clk);
> + if (err) {
> + dev_err(priv->dev, "Unable to start clock: %d\n", err);
> + return err;
> }
>
> + priv->soc_info->usb_phy_init(phy);
> +
> + /* Wait for PHY to reset */
> + usleep_range(30, 300);
> reg = readl(priv->base + REG_USBPCR_OFFSET);
> - reg &= ~USBPCR_USB_MODE;
> - reg |= USBPCR_VBUSVLDEXT | USBPCR_VBUSVLDEXTSEL |
> USBPCR_OTG_DISABLE;
> - writel(reg, priv->base + REG_USBPCR_OFFSET);
> + writel(reg & ~USBPCR_POR, priv->base + REG_USBPCR_OFFSET);
> + usleep_range(300, 1000);
>
> return 0;
> }
>
> -static int ingenic_usb_phy_set_host(struct usb_otg *otg, struct
> usb_bus *host)
> +static int ingenic_usb_phy_exit(struct phy *phy)
> {
> - struct jz4770_phy *priv = otg_to_jz4770_phy(otg);
> - u32 reg;
> + struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
>
> - reg = readl(priv->base + REG_USBPCR_OFFSET);
> - reg &= ~(USBPCR_VBUSVLDEXT | USBPCR_VBUSVLDEXTSEL |
> USBPCR_OTG_DISABLE);
> - reg |= USBPCR_USB_MODE;
> - writel(reg, priv->base + REG_USBPCR_OFFSET);
> + clk_disable_unprepare(priv->clk);
> + regulator_disable(priv->vcc_supply);
>
> return 0;
> }
That part is still messy. You remove ingenic_usb_phy_set_peripheral()
and ingenic_usb_phy_set_host(), then add ingenic_usb_phy_init() and
ingenic_usb_phy_exit(). Why were the two first functions removed? Just
keep these around, and call them from ingenic_usb_phy_set_mode(). That
will automatically make the diff much smaller.
And by making the diff smaller, we can spot the actual differences.
Like how support for PHY_MODE_USB_OTG was added, without any notice.
>
> -static int ingenic_usb_phy_init(struct usb_phy *phy)
> +static int ingenic_usb_phy_power_on(struct phy *phy)
> {
> - struct jz4770_phy *priv = phy_to_jz4770_phy(phy);
> + struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> int err;
> - u32 reg;
>
> err = regulator_enable(priv->vcc_supply);
> if (err) {
> @@ -166,39 +154,71 @@ static int ingenic_usb_phy_init(struct usb_phy
> *phy)
> return err;
> }
>
> - err = clk_prepare_enable(priv->clk);
> - if (err) {
> - dev_err(priv->dev, "Unable to start clock: %d\n", err);
> - return err;
> - }
> -
> - priv->soc_info->usb_phy_init(phy);
> -
> - /* Wait for PHY to reset */
> - usleep_range(30, 300);
> - reg = readl(priv->base + REG_USBPCR_OFFSET);
> - writel(reg & ~USBPCR_POR, priv->base + REG_USBPCR_OFFSET);
> - usleep_range(300, 1000);
> -
> return 0;
> }
>
> -static void ingenic_usb_phy_shutdown(struct usb_phy *phy)
> +static int ingenic_usb_phy_power_off(struct phy *phy)
> {
> - struct jz4770_phy *priv = phy_to_jz4770_phy(phy);
> + struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
>
> - clk_disable_unprepare(priv->clk);
> regulator_disable(priv->vcc_supply);
> +
> + return 0;
> }
>
> -static void ingenic_usb_phy_remove(void *phy)
> +static int ingenic_usb_phy_set_mode(struct phy *phy,
> + enum phy_mode mode, int submode)
> {
> - usb_remove_phy(phy);
> + struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> + u32 reg;
> +
> + switch (mode) {
> + case PHY_MODE_USB_HOST:
> + reg = readl(priv->base + REG_USBPCR_OFFSET);
> + reg &= ~(USBPCR_VBUSVLDEXT | USBPCR_VBUSVLDEXTSEL |
> USBPCR_OTG_DISABLE);
> + reg |= USBPCR_USB_MODE;
> + writel(reg, priv->base + REG_USBPCR_OFFSET);
> +
> + break;
> + case PHY_MODE_USB_DEVICE:
> + if (priv->soc_info->version >= ID_X1000) {
> + reg = readl(priv->base + REG_USBPCR1_OFFSET);
> + reg |= USBPCR1_BVLD_REG;
> + writel(reg, priv->base + REG_USBPCR1_OFFSET);
> + }
> +
> + reg = readl(priv->base + REG_USBPCR_OFFSET);
> + reg &= ~USBPCR_USB_MODE;
> + reg |= USBPCR_VBUSVLDEXT | USBPCR_VBUSVLDEXTSEL |
> USBPCR_OTG_DISABLE;
> + writel(reg, priv->base + REG_USBPCR_OFFSET);
> +
> + break;
> + case PHY_MODE_USB_OTG:
> + reg = readl(priv->base + REG_USBPCR_OFFSET);
> + reg &= ~USBPCR_OTG_DISABLE;
> + reg |= USBPCR_VBUSVLDEXT | USBPCR_VBUSVLDEXTSEL | USBPCR_USB_MODE;
> + writel(reg, priv->base + REG_USBPCR_OFFSET);
> +
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> }
>
> -static void jz4770_usb_phy_init(struct usb_phy *phy)
> +static const struct phy_ops ingenic_usb_phy_ops = {
> + .init = ingenic_usb_phy_init,
> + .exit = ingenic_usb_phy_exit,
> + .power_on = ingenic_usb_phy_power_on,
> + .power_off = ingenic_usb_phy_power_off,
> + .set_mode = ingenic_usb_phy_set_mode,
> + .owner = THIS_MODULE,
> +};
> +
> +static void jz4770_usb_phy_init(struct phy *phy)
> {
> - struct jz4770_phy *priv = phy_to_jz4770_phy(phy);
> + struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> u32 reg;
>
> reg = USBPCR_AVLD_REG | USBPCR_COMMONONN | USBPCR_IDPULLUP_ALWAYS |
> @@ -208,9 +228,9 @@ static void jz4770_usb_phy_init(struct usb_phy
> *phy)
> writel(reg, priv->base + REG_USBPCR_OFFSET);
> }
>
> -static void jz4780_usb_phy_init(struct usb_phy *phy)
> +static void jz4780_usb_phy_init(struct phy *phy)
> {
> - struct jz4770_phy *priv = phy_to_jz4770_phy(phy);
> + struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> u32 reg;
>
> reg = readl(priv->base + REG_USBPCR1_OFFSET) | USBPCR1_USB_SEL |
> @@ -221,9 +241,9 @@ static void jz4780_usb_phy_init(struct usb_phy
> *phy)
> writel(reg, priv->base + REG_USBPCR_OFFSET);
> }
>
> -static void x1000_usb_phy_init(struct usb_phy *phy)
> +static void x1000_usb_phy_init(struct phy *phy)
> {
> - struct jz4770_phy *priv = phy_to_jz4770_phy(phy);
> + struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> u32 reg;
>
> reg = readl(priv->base + REG_USBPCR1_OFFSET) |
> USBPCR1_WORD_IF_16BIT;
> @@ -235,9 +255,9 @@ static void x1000_usb_phy_init(struct usb_phy
> *phy)
> writel(reg, priv->base + REG_USBPCR_OFFSET);
> }
>
> -static void x1830_usb_phy_init(struct usb_phy *phy)
> +static void x1830_usb_phy_init(struct phy *phy)
> {
> - struct jz4770_phy *priv = phy_to_jz4770_phy(phy);
> + struct ingenic_usb_phy *priv = phy_get_drvdata(phy);
> u32 reg;
>
> /* rdt */
> @@ -276,43 +296,25 @@ static const struct ingenic_soc_info
> x1830_soc_info = {
> .usb_phy_init = x1830_usb_phy_init,
> };
>
> -static const struct of_device_id ingenic_usb_phy_of_matches[] = {
> - { .compatible = "ingenic,jz4770-phy", .data = &jz4770_soc_info },
> - { .compatible = "ingenic,jz4780-phy", .data = &jz4780_soc_info },
> - { .compatible = "ingenic,x1000-phy", .data = &x1000_soc_info },
> - { .compatible = "ingenic,x1830-phy", .data = &x1830_soc_info },
> - { /* sentinel */ }
> -};
> -MODULE_DEVICE_TABLE(of, ingenic_usb_phy_of_matches);
Why move that array?
> -
> -static int jz4770_phy_probe(struct platform_device *pdev)
> +static int ingenic_usb_phy_probe(struct platform_device *pdev)
> {
> + struct ingenic_usb_phy *priv;
> + struct phy_provider *provider;
> struct device *dev = &pdev->dev;
> - struct jz4770_phy *priv;
> int err;
>
> priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> if (!priv)
> return -ENOMEM;
>
> - priv->soc_info = device_get_match_data(&pdev->dev);
> + priv->soc_info = device_get_match_data(dev);
> if (!priv->soc_info) {
> - dev_err(&pdev->dev, "Error: No device match found\n");
> + dev_err(dev, "Error: No device match found\n");
> return -ENODEV;
> }
>
> platform_set_drvdata(pdev, priv);
> priv->dev = dev;
> - priv->phy.dev = dev;
> - priv->phy.otg = &priv->otg;
> - priv->phy.label = "ingenic-usb-phy";
> - priv->phy.init = ingenic_usb_phy_init;
> - priv->phy.shutdown = ingenic_usb_phy_shutdown;
> -
> - priv->otg.state = OTG_STATE_UNDEFINED;
> - priv->otg.usb_phy = &priv->phy;
> - priv->otg.set_host = ingenic_usb_phy_set_host;
> - priv->otg.set_peripheral = ingenic_usb_phy_set_peripheral;
>
> priv->base = devm_platform_ioremap_resource(pdev, 0);
> if (IS_ERR(priv->base)) {
> @@ -336,27 +338,40 @@ static int jz4770_phy_probe(struct
> platform_device *pdev)
> return err;
> }
>
> - err = usb_add_phy(&priv->phy, USB_PHY_TYPE_USB2);
> - if (err) {
> - if (err != -EPROBE_DEFER)
> - dev_err(dev, "Unable to register PHY\n");
> - return err;
> - }
> + priv->phy = devm_phy_create(priv->dev, NULL, &ingenic_usb_phy_ops);
You can use 'dev' directly.
> + if (IS_ERR(priv))
> + return PTR_ERR(priv);
> +
> + phy_set_drvdata(priv->phy, priv);
>
> - return devm_add_action_or_reset(dev, ingenic_usb_phy_remove,
> &priv->phy);
> + provider = devm_of_phy_provider_register(priv->dev,
> of_phy_simple_xlate);
> + if (IS_ERR(provider))
> + return PTR_ERR(provider);
> +
> + return 0;
return demv_of_phy_provider_register(dev, ...)
> }
>
> -static struct platform_driver ingenic_phy_driver = {
> - .probe = jz4770_phy_probe,
> +static const struct of_device_id ingenic_usb_phy_of_matches[] = {
> + { .compatible = "ingenic,jz4770-phy", .data = &jz4770_soc_info },
> + { .compatible = "ingenic,jz4780-phy", .data = &jz4780_soc_info },
> + { .compatible = "ingenic,x1000-phy", .data = &x1000_soc_info },
> + { .compatible = "ingenic,x1830-phy", .data = &x1830_soc_info },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, ingenic_usb_phy_of_matches);
> +
> +static struct platform_driver ingenic_usb_phy_driver = {
> + .probe = ingenic_usb_phy_probe,
> .driver = {
> - .name = "jz4770-phy",
> + .name = "ingenic-usb-phy",
> .of_match_table = ingenic_usb_phy_of_matches,
> },
> };
> -module_platform_driver(ingenic_phy_driver);
> +module_platform_driver(ingenic_usb_phy_driver);
>
> MODULE_AUTHOR("周琰杰 (Zhou Yanjie) <zhouyanjie@...yeetech.com>");
> MODULE_AUTHOR("漆鹏振 (Qi Pengzhen) <aric.pzqi@...enic.com>");
> MODULE_AUTHOR("Paul Cercueil <paul@...pouillou.net>");
> MODULE_DESCRIPTION("Ingenic SoCs USB PHY driver");
> +MODULE_ALIAS("jz4770-phy");
So I first thought this generic PHY driver would be a drop-in
replacement for the old jz4770-phy driver, that's why I suggested to
add the jz4770-phy alias. But it turns out that it's a completely
different framework, so we can drop the alias.
That also means that this patch, without any change to the JZ4740 MUSB
driver, breaks USB on all Ingenic SoCs I can test with.
So unless you have a patch to the jz4740-musb driver in this series,
you can't remove the old jz4770-phy driver yet. Just modify this patch
so that the new generic-PHY driver is added, without removing the old
one. It will be much easier to review (one new driver vs lots of +/-
lines) and you can move the code around if you want to. Then when the
jz4740-musb driver is modified to use the generic PHY framework, the
old jz4770-phy driver can be "retired".
Cheers,
-Paul
> MODULE_LICENSE("GPL");
> diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
> index ef4787cd3d37..ff24fca0a2d9 100644
> --- a/drivers/usb/phy/Kconfig
> +++ b/drivers/usb/phy/Kconfig
> @@ -184,12 +184,4 @@ config USB_ULPI_VIEWPORT
> Provides read/write operations to the ULPI phy register set for
> controllers with a viewport register (e.g. Chipidea/ARC
> controllers).
>
> -config JZ4770_PHY
> - tristate "Ingenic SoCs Transceiver Driver"
> - depends on MIPS || COMPILE_TEST
> - select USB_PHY
> - help
> - This driver provides PHY support for the USB controller found
> - on the JZ-series and X-series SoCs from Ingenic.
> -
> endmenu
> diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile
> index b352bdbe8712..df1d99010079 100644
> --- a/drivers/usb/phy/Makefile
> +++ b/drivers/usb/phy/Makefile
> @@ -24,4 +24,3 @@ obj-$(CONFIG_USB_MXS_PHY) += phy-mxs-usb.o
> obj-$(CONFIG_USB_ULPI) += phy-ulpi.o
> obj-$(CONFIG_USB_ULPI_VIEWPORT) += phy-ulpi-viewport.o
> obj-$(CONFIG_KEYSTONE_USB_PHY) += phy-keystone.o
> -obj-$(CONFIG_JZ4770_PHY) += phy-jz4770.o
> --
> 2.11.0
>
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