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([2a02:ab88:3711:c80:e7a7:e025:f1a5:ef78]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-abf0c0b99a6sm339502266b.13.2025.02.28.11.07.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Feb 2025 11:07:20 -0800 (PST) Message-ID: <31cad1da1a02aaf0935d35e9b56357fcea9320fa.camel@gmail.com> Subject: Re: [PATCH v3 5/5] clk: samsung: add exynos7870 CLKOUT support From: David Virag To: Krzysztof Kozlowski , Kaustabh Chakraborty Cc: Sylwester Nawrocki , Chanwoo Choi , Alim Akhtar , Michael Turquette , Stephen Boyd , Rob Herring , Conor Dooley , Krzysztof Kozlowski , linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org Date: Fri, 28 Feb 2025 20:07:15 +0100 In-Reply-To: <5670d992-71f4-4791-94ff-4fadc1fb5993@kernel.org> References: <20250219-exynos7870-pmu-clocks-v3-0-0d1e415e9e3a@disroot.org> <20250219-exynos7870-pmu-clocks-v3-5-0d1e415e9e3a@disroot.org> <20250219-discerning-affable-chital-1fdff4@krzk-bin> <5670d992-71f4-4791-94ff-4fadc1fb5993@kernel.org> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2025-02-24 at 20:13 +0100, Krzysztof Kozlowski wrote: > On 24/02/2025 18:47, Kaustabh Chakraborty wrote: > > >=20 > > > I wonder why do we need to keep growing this list? All devices > > > are > > > compatible, aren't they? > >=20 > > Well, there are two variants of compatibility having different mask > > values. > >=20 > > > Do you use clkout, BTW? > >=20 > > Using the clocks defined by clkout? No. I added it as downstream > > had it too. And the devices work fine without it. If you want me > > to remove this patch and send the PMU patch to its respective > > series I'll do that then (unless you object or suggest something > > else). >=20 > clkout is a testing tool and I doubt you can use it on a phone - > finding > the actual clkout pins to connect the oscilloscope is tricky. Actually, jackpotlte uses one of the clkout pins (7885 has two) to feed it's NFC chip with a clock.=20 Not sure if any 7870 (or any other Exynos) devices use it for something similar but here we have at least one example of a non-debug use for it. I will avoid it on 7885 though until it's actually needed and I can test the functionality (and when I have the time to work on 7885 again). Best Regards, David