linux-kernel - Re: [PATCH] scsi: ufs: dt-bindings: exynos: add power-domains

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Message-ID: <ff3a0b96980669f326ed02ed81b97d34c104b09d.camel@linaro.org>
Date: Wed, 08 Oct 2025 08:56:29 +0100
From: André Draszik <andre.draszik@...aro.org>
To: Alim Akhtar <alim.akhtar@...sung.com>, 'Avri Altman'
 <avri.altman@....com>,  'Bart Van Assche'	 <bvanassche@....org>, 'Rob
 Herring' <robh@...nel.org>, 'Krzysztof Kozlowski'	 <krzk+dt@...nel.org>,
 'Conor Dooley' <conor+dt@...nel.org>
Cc: 'Peter Griffin' <peter.griffin@...aro.org>, 'Tudor Ambarus'	
 <tudor.ambarus@...aro.org>, 'Will McVicker' <willmcvicker@...gle.com>, 
	kernel-team@...roid.com, linux-scsi@...r.kernel.org,
 devicetree@...r.kernel.org, 	linux-arm-kernel@...ts.infradead.org,
 linux-samsung-soc@...r.kernel.org, 	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: ufs: dt-bindings: exynos: add power-domains

On Wed, 2025-10-08 at 11:05 +0530, Alim Akhtar wrote:
> 
> 
> > -----Original Message-----
> > From: André Draszik <andre.draszik@...aro.org>
> > Sent: Tuesday, October 7, 2025 9:26 PM
> > To: Alim Akhtar <alim.akhtar@...sung.com>; Avri Altman
> > <avri.altman@....com>; Bart Van Assche <bvanassche@....org>; Rob
> > Herring <robh@...nel.org>; Krzysztof Kozlowski <krzk+dt@...nel.org>;
> > Conor Dooley <conor+dt@...nel.org>
> > Cc: Peter Griffin <peter.griffin@...aro.org>; Tudor Ambarus
> > <tudor.ambarus@...aro.org>; Will McVicker <willmcvicker@...gle.com>;
> > kernel-team@...roid.com; linux-scsi@...r.kernel.org;
> > devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> > samsung-soc@...r.kernel.org; linux-kernel@...r.kernel.org; André Draszik
> > <andre.draszik@...aro.org>
> > Subject: [PATCH] scsi: ufs: dt-bindings: exynos: add power-domains
> > 
> > The UFS controller can be part of a power domain, so we need to allow the
> > relevant property 'power-domains'.
> > 
> In Exynos, power domains has a boundary at _block_ level. I assume in this
> case it is BLK_HSI, which contains, multiple IPs within block, including UFS
> controller.

On gs101, there are three hsi power domains:
* hsi0 (USB)
* hsi1 (PCIe)
* hsi2 (UFS)

I have not looked at hsi1 so far.

>From what I can gather, hsi2-pd affects:
* cmu_hsi2
* sysreg hsi2
* pinctrl (gpio) hsi2
* ufs
* ufs-phy
(not sure if there is more)

hsi0-pd is similar, except that there is no pinctrl (gpio) hsi0.

They're all modelled as individual nodes in DT, so we need to add the
power-domains = <>
to each of them.

> I hope you will be sending the corresponding DTS changes as well. 

Yes, of course :-)

> Feel free to add 
> Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>

Thanks :-)

Cheers,
Andre'