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Message-ID:
<TYCPR01MB1209398B324FDB1691D80545FC2B32@TYCPR01MB12093.jpnprd01.prod.outlook.com>
Date: Mon, 14 Apr 2025 15:43:02 +0000
From: Fabrizio Castro <fabrizio.castro.jz@...esas.com>
To: ALOK TIWARI <alok.a.tiwari@...cle.com>, Prabhakar
<prabhakar.csengg@...il.com>, Philipp Zabel <p.zabel@...gutronix.de>, Rob
Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor
Dooley <conor+dt@...nel.org>, Geert Uytterhoeven <geert+renesas@...der.be>,
Magnus Damm <magnus.damm@...il.com>
CC: "linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Biju Das
<biju.das.jz@...renesas.com>, Prabhakar Mahadev Lad
<prabhakar.mahadev-lad.rj@...renesas.com>
Subject: RE: [PATCH v4 2/3] reset: Add USB2PHY port reset driver for Renesas
RZ/V2H(P)
Hi Alok,
Thanks for your email.
> From: ALOK TIWARI <alok.a.tiwari@...cle.com>
> Sent: 14 April 2025 14:46
> Subject: Re: [PATCH v4 2/3] reset: Add USB2PHY port reset driver for Renesas RZ/V2H(P)
>
>
> > +static int rzv2h_usbphy_reset_assert(struct reset_controller_dev *rcdev,
> > + unsigned long id)
> > +{
> > + struct rzv2h_usb2phy_reset_priv *priv = rzv2h_usbphy_rcdev_to_priv(rcdev);
> > + struct device *dev = priv->dev;
> > + int ret;
> > +
> > + ret = pm_runtime_resume_and_get(dev);
> > + if (ret) {
>
> nit: it will good if we check similar to reset-rzg2l-usbphy-ctrl.c
> pm_runtime_resume_and_get -> 0 on success, or a negative error code
> otherwise.
> 1 → if the device was resumed and incremented usage count
> 0 → if the device was already active or successfully resumed
> if (ret < 0)
No.
As you can see from:
https://github.com/torvalds/linux/blob/master/include/linux/pm_runtime.h#L444
pm_runtime_resume_and_get returns a negative error code or 0 (when
successful).
The same explanation applies to your other comments.
Kind regards,
Fab
>
> > + dev_err(dev, "pm_runtime_resume_and_get failed\n");
> > + return ret;
> > + }
> > +
> > + rzv2h_usbphy_assert_helper(priv);
> > +
> > + pm_runtime_put(dev);
> > +
> > + return 0;
> > +}
> > +
> > +static int rzv2h_usbphy_reset_deassert(struct reset_controller_dev *rcdev,
> > + unsigned long id)
> > +{
> > + struct rzv2h_usb2phy_reset_priv *priv = rzv2h_usbphy_rcdev_to_priv(rcdev);
> > + const struct rzv2h_usb2phy_reset_of_data *data = priv->data;
> > + struct device *dev = priv->dev;
> > + int ret;
> > +
> > + ret = pm_runtime_resume_and_get(dev);
>
> pm_runtime_resume_and_get -> 0 on success, or a negative error code
> otherwise.
> if (ret < 0)
>
> > + if (ret) {
> > + dev_err(dev, "pm_runtime_resume_and_get failed\n");
> > + return ret;
> > + }
> > +
> > + scoped_guard(spinlock, &priv->lock) {
> > + writel(data->reset_deassert_val, priv->base + data->reset_reg);
> > + writel(data->reset2_release_val, priv->base + data->reset2_reg);
> > + writel(data->reset_release_val, priv->base + data->reset_reg);
> > + }
> > +
> > + pm_runtime_put(dev);
> > +
> > + return 0;
> > +}
> > +
> > +static int rzv2h_usbphy_reset_status(struct reset_controller_dev *rcdev,
> > + unsigned long id)
> > +{
> > + struct rzv2h_usb2phy_reset_priv *priv = rzv2h_usbphy_rcdev_to_priv(rcdev);
> > + struct device *dev = priv->dev;
> > + int ret;
> > + u32 reg;
> > +
> > + ret = pm_runtime_resume_and_get(dev);
>
> pm_runtime_resume_and_get -> 0 on success, or a negative error code
> otherwise.
> if (ret < 0)
>
> > + if (ret) {
> > + dev_err(dev, "pm_runtime_resume_and_get failed\n");
> > + return ret;
> > + }
> > +
> > + reg = readl(priv->base + priv->data->reset_reg);
> > +
> > + pm_runtime_put(dev);
> > +
> > + return (reg & priv->data->reset_status_bits) == priv->data->reset_status_bits;
> > +}
> > +
> > +static const struct reset_control_ops rzv2h_usbphy_reset_ops = {
> > + .assert = rzv2h_usbphy_reset_assert,
> > + .deassert = rzv2h_usbphy_reset_deassert,
> > + .status = rzv2h_usbphy_reset_status,
> > +};
> > +
> > +static int rzv2h_usb2phy_reset_of_xlate(struct reset_controller_dev *rcdev,
> > + const struct of_phandle_args *reset_spec)
> > +{
> > + /* No special handling needed, we have only one reset line per device */
> > + return 0;
> > +}
> > +
> > +static int rzv2h_usb2phy_reset_probe(struct platform_device *pdev)
> > +{
> > + const struct rzv2h_usb2phy_reset_of_data *data;
> > + struct rzv2h_usb2phy_reset_priv *priv;
> > + struct device *dev = &pdev->dev;
> > + struct reset_control *rstc;
> > + int error;
> > +
> > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> > + if (!priv)
> > + return -ENOMEM;
> > +
> > + data = of_device_get_match_data(dev);
> > + if (!data)
> > + return dev_err_probe(dev, -ENODEV,
> > + "failed to match device\n");
> > +
> > + priv->data = data;
> > + priv->dev = dev;
> > + priv->base = devm_platform_ioremap_resource(pdev, 0);
> > + if (IS_ERR(priv->base))
> > + return PTR_ERR(priv->base);
> > +
> > + rstc = devm_reset_control_get_shared_deasserted(dev, NULL);
> > + if (IS_ERR(rstc))
> > + return dev_err_probe(dev, PTR_ERR(rstc),
> > + "failed to get deasserted reset\n");
> > +
> > + spin_lock_init(&priv->lock);
> > + dev_set_drvdata(dev, priv);
> > +
> > + error = devm_pm_runtime_enable(dev);
> > + if (error)
> > + return dev_err_probe(dev, error, "Failed to enable pm_runtime\n");
> > +
> > + error = pm_runtime_resume_and_get(dev);
>
> nit: it will good if we check similar to reset-rzg2l-usbphy-ctrl.c
> pm_runtime_resume_and_get -> 0 on success, or a negative error code
> otherwise.
> if (error < 0)
>
> > + if (error)
> > + return dev_err_probe(dev, error, "pm_runtime_resume_and_get failed\n");
> > +
> > + for (unsigned int i = 0; i < data->init_val_count; i++)
> > + writel(data->init_vals[i].val, priv->base + data->init_vals[i].reg);
> > +
> > + /* keep usb2phy in asserted state */
> > + rzv2h_usbphy_assert_helper(priv);
> > +
> > + pm_runtime_put(dev);
> > +
> > + priv->rcdev.ops = &rzv2h_usbphy_reset_ops;
> > + priv->rcdev.of_reset_n_cells = 0;
> > + priv->rcdev.nr_resets = 1;
> > + priv->rcdev.of_xlate = rzv2h_usb2phy_reset_of_xlate;
> > + priv->rcdev.of_node = dev->of_node;
> > + priv->rcdev.dev = dev;
> > +
> > + return devm_reset_controller_register(dev, &priv->rcdev);
> > +}
> > +
>
>
> Thanks
> Alok
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