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[109.252.193.186]) by smtp.googlemail.com with ESMTPSA id z14sm287943lji.84.2020.10.27.12.23.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 27 Oct 2020 12:23:23 -0700 (PDT) Subject: Re: [PATCH v6 08/52] dt-bindings: memory: tegra20: emc: Document mfd-simple compatible and statistics sub-device To: Thierry Reding Cc: Jonathan Hunter , Georgi Djakov , Rob Herring , Michael Turquette , Stephen Boyd , Peter De Schrijver , MyungJoo Ham , Kyungmin Park , Chanwoo Choi , Mikko Perttunen , Viresh Kumar , Peter Geis , Nicolas Chauvet , Krzysztof Kozlowski , linux-tegra@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org References: <20201025221735.3062-1-digetx@gmail.com> <20201025221735.3062-9-digetx@gmail.com> <20201027132241.GG1822510@ulmo> From: Dmitry Osipenko Message-ID: <0a619270-b301-4eeb-6216-0ad5fed6a20a@gmail.com> Date: Tue, 27 Oct 2020 22:23:22 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201027132241.GG1822510@ulmo> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 27.10.2020 16:22, Thierry Reding пишет: > On Mon, Oct 26, 2020 at 01:16:51AM +0300, Dmitry Osipenko wrote: >> External Memory Controller can gather various hardware statistics that >> are intended to be used for debugging purposes and for dynamic frequency >> scaling of memory bus. >> >> Document the new mfd-simple compatible and EMC statistics sub-device. >> The subdev contains EMC DFS OPP table and interconnect paths to be used >> for dynamic scaling of system's memory bandwidth based on EMC utilization >> statistics. >> >> Signed-off-by: Dmitry Osipenko >> --- >> .../memory-controllers/nvidia,tegra20-emc.txt | 43 +++++++++++++++++-- >> 1 file changed, 40 insertions(+), 3 deletions(-) > > Why does this have to be modelled as a separate device? Isn't this just > using a couple of registers out of the EMC register range? If so, this > would better just be integrated into the parent node and implemented as > part of the EMC driver. No need to further complicate things by adding > a dummy child. Maybe true, I'll take a closer look.