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[71.212.63.227]) by smtp.gmail.com with ESMTPSA id u33-20020a056a0009a100b006e0f7b8d15bsm3722898pfg.185.2024.02.14.10.02.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Feb 2024 10:02:42 -0800 (PST) From: Kevin Hilman To: Conor Dooley Cc: Bhargav Raviprakash , arnd@arndb.de, broonie@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org, gregkh@linuxfoundation.org, jpanis@baylibre.com, kristo@kernel.org, krzysztof.kozlowski+dt@linaro.org, lee@kernel.org, lgirdwood@gmail.com, linus.walleij@linaro.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, m.nirmaladevi@ltts.com, nm@ti.com, robh+dt@kernel.org, vigneshr@ti.com Subject: Re: [RESEND PATCH v1 03/13] dt-bindings: mfd: ti,tps6594: Add TI TPS65224 PMIC In-Reply-To: <20240214-depraved-unfunded-3f0b3d6bf3e2@spud> References: <20240209-blitz-fidgety-78469aa80d6d@spud> <20240214093106.86483-1-bhargav.r@ltts.com> <20240214-galley-dweller-1e9872229d80@spud> <7hil2r5556.fsf@baylibre.com> <20240214-depraved-unfunded-3f0b3d6bf3e2@spud> Date: Wed, 14 Feb 2024 10:02:42 -0800 Message-ID: <7hfrxu6i0t.fsf@baylibre.com> Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Conor Dooley writes: > On Wed, Feb 14, 2024 at 09:26:13AM -0800, Kevin Hilman wrote: >> Conor Dooley writes: >> > On Wed, Feb 14, 2024 at 03:01:06PM +0530, Bhargav Raviprakash wrote: >> >> On Fri 2/9/2024 10:41 PM, Conor Dooley wrote: >> >> > On Thu, Feb 08, 2024 at 04:23:33PM +0530, Bhargav Raviprakash wrote: >> >> > > TPS65224 is a Power Management IC with 4 Buck regulators and 3 LDO >> >> > > regulators, it includes additional features like GPIOs, watchdog,= ESMs >> >> > > (Error Signal Monitor), and PFSM (Pre-configurable Finite State M= achine) >> >> > > managing the state of the device. >> >> >=20 >> >> > > TPS6594 and TPS65224 have significant functional overlap. >> >> >=20 >> >> > What does "significant functional overlap" mean? Does one implement= a >> >> > compatible subset of the other? I assume the answer is no, given th= ere >> >> > seems to be some core looking registers at different addresses. >> >>=20 >> >> The intention behind =E2=80=9Csignificant functional overlap=E2=80=9D= was meant to >> >> indicate a lot of the features between TPS6594 and TPS65224 overlap, >> >> while there are some features specific to TPS65224. >> >> There is compatibility between the PMIC register maps, I2C, PFSM, >> >> and other drivers even though there are some core registers at >> >> different addresses. >> >>=20 >> >> Would it be more appropriate to say the 2 devices are compatible and = have >> >> sufficient feature overlap rather than significant functional overlap? >> > >> > If core registers are at different addresses, then it is unlikely that >> > these devices are compatible. >>=20 >> That's not necessarily true. Hardware designers can sometimes be >> creative. :) > > Hence "unlikely" in my mail :) > >> > In this context, compatible means that existing software intended for >> > the 6594 would run without modification on the 65224, although maybe >> > only supporting a subset of features. If that's not the case, then >> > the devices are not compatible. >>=20 >> Compatible is a fuzzy term... so we need to get into the gray area. >>=20 >> What's going on here is that this new part is derivative in many >> signifcant (but not all) ways from an existing similar part. When >> writing drivers for new, derivative parts, there's always a choice >> between 1) extending the existing driver (using a new compatible string >> & match table for the diffs) or 2) creating a new driver which will have >> a bunch of duplicated code. >>=20 >> The first verion of this series[1] took the 2nd approach, but due to the >> significant functional (and feature) overlap, the recommendation was >> instead to take the "reuse" path to avoid signficant amounts of >> duplicated code. >>=20 >> Of course, it's possible that while going down the "reuse" path, there >> may be a point where creating a separate driver for some aspects might >> make sense, but that needs to be justified. Based on a quick glance of >> what I see in this series so far (I have not done a detailed review), >> the differences with the new device look to me like they can be handled >> with chip-specific data in a match table. > > This is all nice information, but not really relevant here - this is a > binding patch, not a driver one & the conversation stemmed from me > making sure that a fallback compatible was not suitable. hehe, oops. . my fault for mixing the two together Sorry for the noise. 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[71.212.63.227]) by smtp.gmail.com with ESMTPSA id u33-20020a056a0009a100b006e0f7b8d15bsm3722898pfg.185.2024.02.14.10.02.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Feb 2024 10:02:42 -0800 (PST) From: Kevin Hilman To: Conor Dooley Cc: Bhargav Raviprakash , arnd@arndb.de, broonie@kernel.org, conor+dt@kernel.org, devicetree@vger.kernel.org, gregkh@linuxfoundation.org, jpanis@baylibre.com, kristo@kernel.org, krzysztof.kozlowski+dt@linaro.org, lee@kernel.org, lgirdwood@gmail.com, linus.walleij@linaro.org, linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, m.nirmaladevi@ltts.com, nm@ti.com, robh+dt@kernel.org, vigneshr@ti.com Subject: Re: [RESEND PATCH v1 03/13] dt-bindings: mfd: ti,tps6594: Add TI TPS65224 PMIC In-Reply-To: <20240214-depraved-unfunded-3f0b3d6bf3e2@spud> References: <20240209-blitz-fidgety-78469aa80d6d@spud> <20240214093106.86483-1-bhargav.r@ltts.com> <20240214-galley-dweller-1e9872229d80@spud> 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