linux-kernel - Re: [PATCH 08/16] reset: rzg2l-usbphy-ctrl: Add support for RZ/G3S

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Message-ID: <59f4d28b-5b9b-427a-baca-739fc03a5cc1@tuxon.dev>
Date: Fri, 23 Aug 2024 11:40:37 +0300
From: claudiu beznea <claudiu.beznea@...on.dev>
To: Biju Das <biju.das.jz@...renesas.com>, "vkoul@...nel.org"
 <vkoul@...nel.org>, "kishon@...nel.org" <kishon@...nel.org>,
 "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
 <krzk+dt@...nel.org>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
 "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
 "geert+renesas@...der.be" <geert+renesas@...der.be>,
 "magnus.damm@...il.com" <magnus.damm@...il.com>,
 "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
 "mturquette@...libre.com" <mturquette@...libre.com>,
 "sboyd@...nel.org" <sboyd@...nel.org>,
 Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
 "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>
Cc: "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
 "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
 "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
 "linux-arm-kernel@...ts.infradead.org"
 <linux-arm-kernel@...ts.infradead.org>,
 "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
 "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
 Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH 08/16] reset: rzg2l-usbphy-ctrl: Add support for RZ/G3S

Hi, Biju,

On 22.08.2024 19:59, Biju Das wrote:
> Hi Claudiu,
> 
>> -----Original Message-----
>> From: Claudiu <claudiu.beznea@...on.dev>
>> Sent: Thursday, August 22, 2024 4:28 PM
>> Subject: [PATCH 08/16] reset: rzg2l-usbphy-ctrl: Add support for RZ/G3S
>>
>> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>>
>> Add support for RZ/G3S SoC. It needs its own compatible as it uses 2 reset signals and it cannot work
>> w/o both of them. To be able to fully validate this on DT schema, too, the RZ/G3S uses it's own
>> compatible w/o a fallback (as if the fallback will be used the RZ/G3S will not work anyway).
> 
> Other than reset/ power domain approach for handling USBPWRRDY signal
> 
> Can't USBPWRRDY signal handled in SYSC driver directly? Since SYSC driver init happens at very early boot stage
> Check for USBPHY control device availability and handle USBPWRRDY signal there??

In theory, it can be done this way, too.  The downside I see at the moment
with this approach would be that the USB, PCIe drivers will not be in
charge with handling their signals, there will be no direct dependency
available b/w SYSC and USB drivers.

The HW manual doesn't mention anything about the power consumption of the
USB, PCI areas based on the state of the signals from SYSC, so, I don't
know if there will be any implication on this if the signals will be just
de-asserted from the SYSC driver.


Thank you,
Claudiu Beznea


> Cheers,
> Biju
> 
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>> ---
>>  drivers/reset/reset-rzg2l-usbphy-ctrl.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/reset/reset-rzg2l-usbphy-ctrl.c b/drivers/reset/reset-rzg2l-usbphy-ctrl.c
>> index 8b64c12f3bec..08b18d7de7ad 100644
>> --- a/drivers/reset/reset-rzg2l-usbphy-ctrl.c
>> +++ b/drivers/reset/reset-rzg2l-usbphy-ctrl.c
>> @@ -93,6 +93,7 @@ static int rzg2l_usbphy_ctrl_status(struct reset_controller_dev *rcdev,
>>
>>  static const struct of_device_id rzg2l_usbphy_ctrl_match_table[] = {
>>  	{ .compatible = "renesas,rzg2l-usbphy-ctrl" },
>> +	{ .compatible = "renesas,r9a08g045-usbphy-ctrl" },
>>  	{ /* Sentinel */ }
>>  };
>>  MODULE_DEVICE_TABLE(of, rzg2l_usbphy_ctrl_match_table);
>> --
>> 2.39.2
>