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19:12:19 +0100 Date: Wed, 24 Jun 2020 19:12:19 +0100 From: Russell King - ARM Linux admin To: Bartosz Golaszewski Subject: Re: [PATCH 14/15] net: phy: add PHY regulator support Message-ID: <20200624181218.GC1551@shell.armlinux.org.uk> References: <20200622093744.13685-1-brgl@bgdev.pl> <20200622093744.13685-15-brgl@bgdev.pl> <20200622132921.GI1551@shell.armlinux.org.uk> <20200623094252.GS1551@shell.armlinux.org.uk> <20200623095646.GT1551@shell.armlinux.org.uk> <20200624165719.GB1551@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200624165719.GB1551@shell.armlinux.org.uk> User-Agent: Mutt/1.10.1 (2018-07-13) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Andrew Lunn , Alexandre Belloni , devicetree , Vladimir Oltean , Linux Kernel Mailing List , Fabien Parent , Iyappan Subramanian , Quan Nguyen , Frank Rowand , Florian 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Miller" , Heiner Kallweit Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gV2VkLCBKdW4gMjQsIDIwMjAgYXQgMDU6NTc6MTlQTSArMDEwMCwgUnVzc2VsbCBLaW5nIC0g QVJNIExpbnV4IGFkbWluIHdyb3RlOgo+IE9uIFR1ZSwgSnVuIDIzLCAyMDIwIGF0IDA2OjI3OjA2 UE0gKzAyMDAsIEJhcnRvc3ogR29sYXN6ZXdza2kgd3JvdGU6Cj4gPiB3dC4sIDIzIGN6ZSAyMDIw IG8gMTE6NTYgUnVzc2VsbCBLaW5nIC0gQVJNIExpbnV4IGFkbWluCj4gPiA8bGludXhAYXJtbGlu dXgub3JnLnVrPiBuYXBpc2HFgihhKToKPiA+ID4KPiA+ID4gT24gVHVlLCBKdW4gMjMsIDIwMjAg YXQgMTE6NDY6MTVBTSArMDIwMCwgQmFydG9zeiBHb2xhc3pld3NraSB3cm90ZToKPiA+ID4gPiB3 dC4sIDIzIGN6ZSAyMDIwIG8gMTE6NDMgUnVzc2VsbCBLaW5nIC0gQVJNIExpbnV4IGFkbWluCj4g PiA+ID4gPGxpbnV4QGFybWxpbnV4Lm9yZy51az4gbmFwaXNhxYIoYSk6Cj4gPiA+ID4gPgo+ID4g PiA+ID4gT24gVHVlLCBKdW4gMjMsIDIwMjAgYXQgMTE6NDE6MTFBTSArMDIwMCwgQmFydG9zeiBH b2xhc3pld3NraSB3cm90ZToKPiA+ID4gPiA+ID4gcG9uLiwgMjIgY3plIDIwMjAgbyAxNToyOSBS 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Fainelli , Bartosz Golaszewski , Jakub Kicinski , Vivien Didelot , devicetree , Philipp Zabel , Stephane Le Provost , Keyur Chudgar , Jassi Brar , Claudiu Manoil , Mark Brown , "moderated list:ARM/Mediatek SoC..." , Matthias Brugger , Linux ARM , netdev , Ilias Apalodimas , Linux Kernel Mailing List , Rob Herring , Andrew Perepech , Pedro Tsai , "David S . Miller" , Heiner Kallweit Subject: Re: [PATCH 14/15] net: phy: add PHY regulator support Message-ID: <20200624181218.GC1551@shell.armlinux.org.uk> References: <20200622093744.13685-1-brgl@bgdev.pl> <20200622093744.13685-15-brgl@bgdev.pl> <20200622132921.GI1551@shell.armlinux.org.uk> <20200623094252.GS1551@shell.armlinux.org.uk> <20200623095646.GT1551@shell.armlinux.org.uk> <20200624165719.GB1551@shell.armlinux.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20200624165719.GB1551@shell.armlinux.org.uk> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Wed, Jun 24, 2020 at 05:57:19PM +0100, Russell King - ARM Linux admin wrote: > On Tue, Jun 23, 2020 at 06:27:06PM +0200, Bartosz Golaszewski wrote: > > wt., 23 cze 2020 o 11:56 Russell King - ARM Linux admin > > napisał(a): > > > > > > On Tue, Jun 23, 2020 at 11:46:15AM +0200, Bartosz Golaszewski wrote: > > > > wt., 23 cze 2020 o 11:43 Russell King - ARM Linux admin > > > > napisał(a): > > > > > > > > > > On Tue, Jun 23, 2020 at 11:41:11AM +0200, Bartosz Golaszewski wrote: > > > > > > pon., 22 cze 2020 o 15:29 Russell King - ARM Linux admin > > > > > > napisał(a): > > > > > > > > > > > > > > > > > > > [snip!] > > > > > > > > > > > > > > > > > > > > This is likely to cause issues for some PHY drivers. Note that we have > > > > > > > some PHY drivers which register a temperature sensor in the probe > > > > > > > function, which means they can be accessed independently of the lifetime > > > > > > > of the PHY bound to the network driver (which may only be while the > > > > > > > network device is "up".) We certainly do not want hwmon failing just > > > > > > > because the network device is down. > > > > > > > > > > > > > > That's kind of worked around for the reset stuff, because there are two > > > > > > > layers to that: the mdio device layer reset support which knows nothing > > > > > > > of the PHY binding state to the network driver, and the phylib reset > > > > > > > support, but it is not nice. > > > > > > > > > > > > > > > > > > > Regulators are reference counted so if the hwmon driver enables it > > > > > > using mdio_device_power_on() it will stay on even after the PHY driver > > > > > > calls phy_device_power_off(), right? Am I missing something? > > > > > > > > > > If that is true, you will need to audit the PHY drivers to add that. > > > > > > > > > > > > > This change doesn't have any effect on devices which don't have a > > > > regulator assigned in DT though. The one I'm adding in the last patch > > > > is the first to use this. > > > > > > It's quality of implementation. > > > > > > Should we wait for someone else to make use of the new regulator > > > support that has been added with a PHY that uses hwmon, and they > > > don't realise that it breaks hwmon on it, and several kernel versions > > > go by without it being noticed. It will only be a noticable issue > > > when the associated network device is down, and that network device > > > driver detaches from the PHY, so _is_ likely not to be noticed. > > > > > > Or should we do a small amount of work now to properly implement > > > regulator support, which includes a trivial grep for "hwmon" amongst > > > the PHY drivers, and add the necessary call to avoid the regulator > > > being shut off. > > > > > > > I'm not sure what the correct approach is here. Provide some helper > > that, when called, would increase the regulator's reference count even > > more to keep it enabled from the moment hwmon is registered to when > > the driver is detached? > > I think a PHY driver needs the utility to control this. We need to be > careful here with naming, because phylib is not the only code in the > kernel that uses the phy_ prefix. > > If we had runtime PM support for PHYs, with regulator support hooked > into runtime PM, then we already have standard interfaces that drivers > can use to control whether the device gets powered down. Other ideas: - using genpd outside of the SoC to provide power domain management. This is already hooked into runtime PM, but would need their agreement, a genpd provider written, and runtime PM added to phylib. - if we're going for some core driver model approach, then the driver model only knows when devices are bound and unbound to their driver, it knows nothing of phylib's attach/detach from the network interface. If we want to shut off power when a PHY is not attached, we would likely need some kind of interface to do that. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!