linux-kernel - RE: [PATCH v2 04/11] phy: renesas: Add Renesas RZ/G3E USB3.0 PHY driver

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Message-ID:
 <TY3PR01MB11346B0B825BC26B1AF690EF7860EA@TY3PR01MB11346.jpnprd01.prod.outlook.com>
Date: Wed, 10 Sep 2025 10:43:54 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Philipp Zabel <p.zabel@...gutronix.de>, biju.das.au
	<biju.das.au@...il.com>, Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham
 I <kishon@...nel.org>, Geert Uytterhoeven <geert+renesas@...der.be>,
	magnus.damm <magnus.damm@...il.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: RE: [PATCH v2 04/11] phy: renesas: Add Renesas RZ/G3E USB3.0 PHY
 driver

Hi Philipp Zabel,

Thanks for the feedback.

> -----Original Message-----
> From: Philipp Zabel <p.zabel@...gutronix.de>
> Sent: 10 September 2025 10:18
> Subject: Re: [PATCH v2 04/11] phy: renesas: Add Renesas RZ/G3E USB3.0 PHY driver
> 
> On Di, 2025-09-09 at 19:07 +0100, Biju wrote:
> > From: Biju Das <biju.das.jz@...renesas.com>
> >
> > Add Renesas RZ/G3E USB3.0 PHY driver. This module is connected between
> > USB3 Host and PHY module. The main functions of this module are:
> >  1) Reset control
> >  2) Control of PHY input pins
> >  3) Monitoring of PHY output pins
> >
> > Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
> > ---
> > v1->v2:
> >  * Replaced magic numbers with macros.
> > ---
> >  drivers/phy/renesas/Kconfig          |   7 +
> >  drivers/phy/renesas/Makefile         |   1 +
> >  drivers/phy/renesas/phy-rzg3e-usb3.c | 271
> > +++++++++++++++++++++++++++
> >  3 files changed, 279 insertions(+)
> >  create mode 100644 drivers/phy/renesas/phy-rzg3e-usb3.c
> >
> [...]
> > diff --git a/drivers/phy/renesas/phy-rzg3e-usb3.c
> > b/drivers/phy/renesas/phy-rzg3e-usb3.c
> > new file mode 100644
> > index 000000000000..6463519b2c22
> > --- /dev/null
> > +++ b/drivers/phy/renesas/phy-rzg3e-usb3.c
> > @@ -0,0 +1,271 @@
> [...]
> > +static int rzg3e_phy_usb3_probe(struct platform_device *pdev) {
> > +	struct device *dev = &pdev->dev;
> > +	struct phy_provider *provider;
> > +	struct rz_usb3 *r;
> > +	struct phy *phy;
> > +	int ret;
> > +
> > +	r = devm_kzalloc(dev, sizeof(*r), GFP_KERNEL);
> > +	if (!r)
> > +		return -ENOMEM;
> > +
> > +	r->base = devm_platform_ioremap_resource(pdev, 0);
> > +	if (IS_ERR(r->base))
> > +		return PTR_ERR(r->base);
> > +
> > +	r->rstc = devm_reset_control_get_shared(dev, NULL);
> > +	if (IS_ERR(r->rstc))
> > +		return dev_err_probe(dev, PTR_ERR(r->rstc), "failed to get
> > +reset\n");
> > +
> > +	ret = reset_control_deassert(r->rstc);
> > +	if (ret)
> > +		return ret;
> 
> It looks like you should be able to use
> devm_reset_control_get_shared_deasserted() and let devres handle reset control assertion on error and
> driver removal.
> 
> As is, the driver is missing a reset_control_assert() in the probe error paths.

Agreed. Will address this in next version.

Cheers,
Biju