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[24.155.109.49]) by smtp.gmail.com with ESMTPSA id q26sm672522ota.35.2019.04.29.10.23.37 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 29 Apr 2019 10:23:38 -0700 (PDT) Date: Mon, 29 Apr 2019 12:23:37 -0500 From: Rob Herring To: Sylwester Nawrocki Cc: krzk@kernel.org, kgene@kernel.org, mark.rutland@arm.com, cw00.choi@samsung.com, myungjoo.ham@samsung.com, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, pankaj.dubey@samsung.com, b.zolnierkie@samsung.com, m.szyprowski@samsung.com Subject: Re: [PATCH RFC 3/8] dt-bindings: exynos: Add ASV tables binding documentation Message-ID: <20190429172337.GA30032@bogus> References: <20190404171735.12815-1-s.nawrocki@samsung.com> <20190404171735.12815-4-s.nawrocki@samsung.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190404171735.12815-4-s.nawrocki@samsung.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Apr 04, 2019 at 07:17:30PM +0200, Sylwester Nawrocki wrote: > This patch adds documentation of the Exynos ASV (Adaptive Voltage Supply) > tables DT binding. > > Signed-off-by: Sylwester Nawrocki > --- > .../devicetree/bindings/arm/samsung/asv.txt | 76 +++++++++++++++++++ > 1 file changed, 76 insertions(+) > create mode 100644 Documentation/devicetree/bindings/arm/samsung/asv.txt > > diff --git a/Documentation/devicetree/bindings/arm/samsung/asv.txt b/Documentation/devicetree/bindings/arm/samsung/asv.txt > new file mode 100644 > index 000000000000..0db907263a91 > --- /dev/null > +++ b/Documentation/devicetree/bindings/arm/samsung/asv.txt > @@ -0,0 +1,76 @@ > +Exynos Adaptive Supply Voltage (ASV) tables > +------------------------------------------- > + > +The Adaptive Supply Voltage (ASV) on Exynos SoCs is a technique of adjusting > +operating points, i.e. the power supply voltage for given clock frequency, > +in order to better match actual capabilities of the hardware and optimize power > +consumption. This applies to subsystem of the SoC like: CPU clusters, GPU, > +the memory controller or camera ISP. During production process the SoC chip > +is assigned to one of several bins (ASV groups) and the group information > +is encoded in the SoC CHIPID block registers and/or OTP memory. This information > +is then used by the OS to select more finely matching operating points for > +devices. We already have OPP tables defined for QCom CPUs to do speed bining, and I just reviewed something from Allwinner for similar purposes. We can't have each vendor doing their own thing here. Rob