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[66.90.148.213]) by smtp.gmail.com with ESMTPSA id bf3sm4380920oib.34.2021.10.25.15.16.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Oct 2021 15:16:35 -0700 (PDT) Received: (nullmailer pid 1182134 invoked by uid 1000); Mon, 25 Oct 2021 22:16:34 -0000 Date: Mon, 25 Oct 2021 17:16:34 -0500 From: Rob Herring To: Jim Quinlan Cc: Mark Brown , Jim Quinlan , "open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" , Nicolas Saenz Julienne , "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" , Florian Fainelli , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Bjorn Helgaas , "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , open list Subject: Re: [PATCH v5 4/6] PCI: brcmstb: Add control of subdevice voltage regulators Message-ID: References: <20211022140714.28767-1-jim2101024@gmail.com> <20211022140714.28767-5-jim2101024@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211025_151638_756366_8C8F9EA7 X-CRM114-Status: GOOD ( 25.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Oct 22, 2021 at 03:15:59PM -0400, Jim Quinlan wrote: > On Fri, Oct 22, 2021 at 10:31 AM Mark Brown wrote: > > > > On Fri, Oct 22, 2021 at 10:06:57AM -0400, Jim Quinlan wrote: > > > > > +static const char * const supplies[] = { > > > + "vpcie3v3-supply", > > > + "vpcie3v3aux-supply", > > > + "brcm-ep-a-supply", > > > + "brcm-ep-b-supply", > > > +}; > > > > Why are you including "-supply" in the names here? That will lead to > > a double -supply when we look in the DT which probably isn't what you're > > looking for. > I'm not sure how this got past testing; will fix. > > > > > Also are you *sure* that the device has supplies with names like > > "brcm-ep-a"? That seems rather unidiomatic for electrical engineering, > > the names here are supposed to correspond to the names used in the > > datasheet for the part. > I try to explain this in the commit message of"PCI: allow for callback > to prepare nascent subdev". Wrt to the names, > > "These regulators typically govern the actual power supply to the > endpoint chip. Sometimes they may be a the official PCIe socket > power -- such as 3.3v or aux-3.3v. Sometimes they are truly > the regulator(s) that supply power to the EP chip." > > Each different SOC./board we deal with may present different ways of > making the EP device power on. We are using > an abstraction name "brcm-ep-a" to represent some required regulator > to make the EP work for a specific board. The RC > driver cannot hard code a descriptive name as it must work for all > boards designed by us, others, and third parties. > The EP driver also doesn't know or care about the regulator name, and > this driver is often closed source and often immutable. The EP > device itself may come from Brcm, a third party, or sometimes a competitor. > > Basically, we find using a generic name such as "brcm-ep-a-supply" > quite handy and many of our customers embrace this feature. > I know that Rob was initially against such a generic name, but I > vaguely remember him seeing some merit to this, perhaps a tiny bit :-) > Or my memory is shot, which could very well be the case. I don't recall being in favor of this. If you've got standard rails (3.3V and 12V), then I'm fine with standard properties for them with or without a slot. Rob _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel