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From: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
To: Philipp Zabel <p.zabel@pengutronix.de>
Cc: tomm.merciai@gmail.com, peda@axentia.se,
	linux-renesas-soc@vger.kernel.org, biju.das.jz@bp.renesas.com,
	Fabrizio Castro <fabrizio.castro.jz@renesas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Magnus Damm <magnus.damm@gmail.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Josua Mayer <josua@solid-run.com>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v9 5/6] reset: rzv2h-usb2phy: Convert to regmap API
Date: Wed, 1 Apr 2026 12:25:36 +0200	[thread overview]
Message-ID: <aczyoGDHe_PtwUzj@tom-desktop> (raw)
In-Reply-To: <7b5c5300921c9d7c931389400cdf6fb2b74ae3ea.camel@pengutronix.de>

Hi Philipp,
Thanks for your comments.

On Wed, Apr 01, 2026 at 11:25:52AM +0200, Philipp Zabel wrote:
> On Mi, 2026-04-01 at 11:10 +0200, Tommaso Merciai wrote:
> [...]
> > 
> > Then we can have:
> > 
> > static const struct reg_sequence rzv2h_init_seq[] = {
> > 	{ .reg = 0xc10, .def = 0x67c },
> > 	{ .reg = 0xc14, .def = 0x01f },
> > 	{ .reg = 0x600, .def = 0x909 },
> > };
> > 
> > static const struct reg_sequence rzv2h_assert_seq[] = {
> > 	{ .reg = 0xb04, .def = 0x303 },
> > 	{ .reg = 0x000, .def = 0x206, .delay_us = 20 },
> 
> This will call fsleep(20), which maps to usleep_range(20, 25).
> Please comment on why the delay is changed in the commit message.

Ouch, thanks.

Reference Manual says:
 - This reset must be asserted for more than 10us.

Then I think the right choiche would be:
	
	.delay_us = 11

This will call fsleep(11) which maps usleep_range(11, 13)
Please correct me if I'm wrong.

Thanks,
Tommaso


> 
> regards
> Philipp

  reply	other threads:[~2026-04-01 10:25 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-03-27 18:08 [PATCH v9 0/6] Add USB2.0 VBUS mux driver and extend rzv2h-usb2phy reset for RZ/G3E support Tommaso Merciai
2026-03-27 18:08 ` [PATCH v9 1/6] mux: Add driver for Renesas RZ/V2H USB VBENCTL VBUS_SEL mux Tommaso Merciai
2026-03-27 18:08 ` [PATCH v9 2/6] dt-bindings: reset: renesas,rzv2h-usb2phy: Add '#mux-state-cells' property Tommaso Merciai
2026-03-27 18:08 ` [PATCH v9 3/6] dt-bindings: reset: renesas,rzv2h-usb2phy: Document RZ/G3E USB2PHY reset Tommaso Merciai
2026-03-27 18:08 ` [PATCH v9 4/6] reset: rzv2h-usb2phy: Keep PHY clock enabled for entire device lifetime Tommaso Merciai
2026-03-27 18:08 ` [PATCH v9 5/6] reset: rzv2h-usb2phy: Convert to regmap API Tommaso Merciai
2026-03-31 16:36   ` Philipp Zabel
2026-04-01  8:04     ` Tommaso Merciai
2026-04-01  8:23       ` Philipp Zabel
2026-04-01  9:10         ` Tommaso Merciai
2026-04-01  9:25           ` Philipp Zabel
2026-04-01 10:25             ` Tommaso Merciai [this message]
2026-03-27 18:08 ` [PATCH v9 6/6] reset: rzv2h-usb2phy: Add support for VBUS mux controller registration Tommaso Merciai
2026-03-31 16:16 ` [PATCH v9 0/6] Add USB2.0 VBUS mux driver and extend rzv2h-usb2phy reset for RZ/G3E support Ulf Hansson

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