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Mon, 1 Jun 2020 08:19:45 +0000 (GMT) Subject: Re: [RFC PATCH v5 1/6] dt-bindings: exynos-bus: Add documentation for interconnect properties To: georgi.djakov@linaro.org, cw00.choi@samsung.com, krzk@kernel.org Cc: a.swigon@samsung.com, myungjoo.ham@samsung.com, inki.dae@samsung.com, sw0312.kim@samsung.com, b.zolnierkie@samsung.com, m.szyprowski@samsung.com, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, Rob Herring , devicetree@vger.kernel.org From: Sylwester Nawrocki Message-ID: Date: Mon, 1 Jun 2020 10:19:45 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.8.1 MIME-Version: 1.0 In-Reply-To: <20200529163200.18031-2-s.nawrocki@samsung.com> Content-Language: en-US Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA02Sa0hTYRiA+XbOzo6j2XFavpiZTYtU8oL9OJCsFINhGP0KstRmHqbmpmxe Wn9SRDNvmEreSrvMFDUvc4nM1FJLcl5AxTSNVS5FRULUxGaW2zHy3/O+7/PxXvhITDjJdSJj FUmMUiGNFxF8vP391uhpN/1EhG+JhksbqzIR3VrWzKU/ri9w6er+ES49sfGDoEu7tARdZCzE 6dHRFh6tnZvk0uP6RwRdNtrNoV/2f+bRM+l1BJ3Z1c+jy4oXifMHJdr6+4RkdvI1ITHmDnAk bZq7kgJdPZKsaV0uE2H8gGgmPjaFUfqIb/BjJsfbUWLr4dvpi9koDTUIcxBJAnUGhnVeOciG FFJ1CBamnHMQf5fXEcxVt/HYYA3BdpqOY7EsD4ZqSzhsoRbBG/MmxgarCEZqx3CLZU/FQMfX fMzCDlQwZH2vwi0SRn3jwE5jJddSICg/yH9XgCwsoMSQ93zc2gKn3GFDu2PlQ1Q45BmXMNax gw/lJmsDGyoAmpcNVgejHOGTqXqPj0HGq0qMHXWLB/MaV5aDYbry6V7eHpYGdDyWncFQnGcd DqgMBHmdMzw2KERgHHiCWOsszI78IiwXwygPaNb7sOlAME01cdhD2sLUih07gy0UtZdibFoA 2VlC1nYHc33p3hWdINf0By9Eoop9m1Xs26Zi3zYV//s+QXg9cmSSVXIZo/JXMKneKqlclayQ ed9MkGvR7m8z7AxsdKDu7aheRJFIdEBwamw8QsiVpqjU8l4EJCZyEAQNGyKEgmip+g6jTIhU Jsczql50hMRFjgL/Z4vhQkomTWJuMUwio/xX5ZA2Tmko0skUd84DCtUnfFKvBEWsttXyq7x+ Rg369JUf737g2s1s9vXKltoeuptP1vjKWnKuumQ0fbnXM6SueWwOGV4jyFJF57pmTd0Y7/l7 8yLdM5bMM4vdXJqv6Ru8+6+HwkZJWE+I2KBemb80zakRv0WJofKs+cEXRcvyC0cDM+JEuCpG 6ueJKVXSv0Jw6cppAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrBIsWRmVeSWpSXmKPExsVy+t/xe7pKu67EGSw6aWBxf14ro8XGGetZ La5/ec5qMf/IOVaLK1/fs1lM37uJzWLS/QksFufPb2C32PT4GqvF5V1z2CxmnN/HZLH2yF12 i9uNK9gsWvceYbeYMfklmwO/x6ZVnWwed67tYfO4332cyWPzknqPvi2rGD0+b5ILYIvSsynK Ly1JVcjILy6xVYo2tDDSM7S00DMysdQzNDaPtTIyVdK3s0lJzcksSy3St0vQy7h2eRtjwUax isaXHYwNjKuFuhg5OSQETCTOLJ/CBGILCSxllDj/LKqLkQMoLiUxv0UJokRY4s+1LjaIkveM EgcXqoLYwgIZEj17D4PFRQRcJNqezmPpYuTiYBZ4xCSxtKmPGcQREjjIKPH2yCV2kCo2AUOJ 3qN9jCA2r4CdRM/iy2CLWQRUJL5u+gdmiwrESnQv/sEOUSMocXLmExYQm1PARmL969NgNcwC 6hJ/5l1ihrDFJW49mQ8Vl5do3jqbeQKj0Cwk7bOQtMxC0jILScsCRpZVjCKppcW56bnFRnrF ibnFpXnpesn5uZsYgbG87djPLTsYu94FH2IU4GBU4uG9cP5ynBBrYllxZe4hRgkOZiURXqez p+OEeFMSK6tSi/Lji0pzUosPMZoCPTeRWUo0OR+YZvJK4g1NDc0tLA3Njc2NzSyUxHk7BA7G CAmkJ5akZqemFqQWwfQxcXBKNTDW9PwIOPPpYPHDh/u2sc6YdfTX6lzNWwYrPm6NnrprHdM9 fhsGTptTrx9HOTg93rmg8F/V/az4NZOTqr727q2oU9gyZ8/uc+YrNfOFlhhoxb5sEMtVvWz6 qunA39TJL6+73XFq/CPwdsqKhTderayV/mghEmgY9Z7l/AJHq7brUV4PRO/eYE/dq8RSnJFo qMVcVJwIAIa1OQb7AgAA X-CMS-MailID: 20200601081946eucas1p208442218e510398cacb83e4e08217bef X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20200529163219eucas1p2d127fe3936921f53f6fe7902e7d14a3e X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200529163219eucas1p2d127fe3936921f53f6fe7902e7d14a3e References: <20200529163200.18031-1-s.nawrocki@samsung.com> <20200529163200.18031-2-s.nawrocki@samsung.com> Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Cc: Rob, devicetree ML On 29.05.2020 18:31, Sylwester Nawrocki wrote: > Add documentation for new optional properties in the exynos bus nodes: > samsung,interconnect-parent, #interconnect-cells. > These properties allow to specify the SoC interconnect structure which > then allows the interconnect consumer devices to request specific > bandwidth requirements. > > Signed-off-by: Artur Świgoń > Signed-off-by: Sylwester Nawrocki > --- > Changes for v5: > - exynos,interconnect-parent-node renamed to samsung,interconnect-parent > --- > Documentation/devicetree/bindings/devfreq/exynos-bus.txt | 15 +++++++++++++-- > 1 file changed, 13 insertions(+), 2 deletions(-) > > diff --git a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt > index e71f752..e0d2daa 100644 > --- a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt > +++ b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt > @@ -51,6 +51,11 @@ Optional properties only for parent bus device: > - exynos,saturation-ratio: the percentage value which is used to calibrate > the performance count against total cycle count. > > +Optional properties for interconnect functionality (QoS frequency constraints): > +- samsung,interconnect-parent: phandle to the parent interconnect node; for > + passive devices should point to same node as the exynos,parent-bus property. > +- #interconnect-cells: should be 0 > + > Detailed correlation between sub-blocks and power line according to Exynos SoC: > - In case of Exynos3250, there are two power line as following: > VDD_MIF |--- DMC > @@ -185,8 +190,9 @@ Example1: > ---------------------------------------------------------- > > Example2 : > - The bus of DMC (Dynamic Memory Controller) block in exynos3250.dtsi > - is listed below: > + The bus of DMC (Dynamic Memory Controller) block in exynos3250.dtsi is > + listed below. An interconnect path "bus_lcd0 -- bus_leftbus -- bus_dmc" > + is defined for demonstration purposes. > > bus_dmc: bus_dmc { > compatible = "samsung,exynos-bus"; > @@ -376,12 +382,15 @@ Example2 : > &bus_dmc { > devfreq-events = <&ppmu_dmc0_3>, <&ppmu_dmc1_3>; > vdd-supply = <&buck1_reg>; /* VDD_MIF */ > + #interconnect-cells = <0>; > status = "okay"; > }; > > &bus_leftbus { > devfreq-events = <&ppmu_leftbus_3>, <&ppmu_rightbus_3>; > vdd-supply = <&buck3_reg>; > + samsung,interconnect-parent = <&bus_dmc>; > + #interconnect-cells = <0>; > status = "okay"; > }; > > @@ -392,6 +401,8 @@ Example2 : > > &bus_lcd0 { > devfreq = <&bus_leftbus>; > + samsung,interconnect-parent = <&bus_leftbus>; > + #interconnect-cells = <0>; > status = "okay"; > }; > > -- > 2.7.4