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Wed, 21 Aug 2019 10:43:20 +0000 (GMT) From: Lukasz Luba To: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-clk@vger.kernel.org Cc: mturquette@baylibre.com, sboyd@kernel.org, b.zolnierkie@samsung.com, krzk@kernel.org, kgene@kernel.org, mark.rutland@arm.com, robh+dt@kernel.org, cw00.choi@samsung.com, kyungmin.park@samsung.com, m.szyprowski@samsung.com, s.nawrocki@samsung.com, myungjoo.ham@samsung.com, keescook@chromium.org, tony@atomide.com, jroedel@suse.de, treding@nvidia.com, digetx@gmail.com, gregkh@linuxfoundation.org, willy.mh.wolff.ml@gmail.com, Lukasz Luba Subject: [PATCH v13 4/8] dt-bindings: memory-controllers: add Exynos5422 DMC device description Date: Wed, 21 Aug 2019 12:42:59 +0200 Message-Id: <20190821104303.32079-5-l.luba@partner.samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190821104303.32079-1-l.luba@partner.samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0VSa1BMYRju23POnrON5bQ19SYjszNMDCEyn9G4zLicMSMN44eaRktnKnYr e1q5jdmYxNYWcmm6uYSS1XbZSUVh25HuLVI0GYSMSyShoWidxb/nfd7n+Z5n3vkYQvGRmszE xCbw2liVWil1JSvvjrTNWTstPHyeoWoSLssyU7jrSz+Fz9raKHx1sA/hQwVmKc5sypPgllQN zuh7R+D29lIatx58T+Mn+il4MO0phR/U5ErxkNGGcFZ7nQRfs/XS+FKXXYLtTatwT1KRFCfX 2mhc/z6FwmOPykh86+Fa3PNjIv567wVa7s2Z8k2I+zp8guQ+difTXI7eTnLV2b00V158VMrd yjPRnPHQgJS7M3BTwqVbihFX0byPGyqfGjIh1DUoklfH7OK1c5dGuEZbkiLj0313V1/ppPSo 39uAZAywC8Fq7pYakCujYIsQjLzsIMThC4Kkb62kOAwhyBwokfy1HDmZ7rQUIrAeHyP/WR5X jtIGxDBS1h+qinc6DB5sFoKcNxsdGoJ9TkD6tVzkWLizKjAOi3qSnQ6Db3QOWs4ug3MXsygx zBeult4mHFjGLoexY42U4x1g8xgwp712ilZCb0knLWJ3eNtgceIp8Kv6rLO1AHrjeSTi/dCX kefULIH6Bjvl6ECwM8FcM1ekV0B14cs/1YCdCN0f3Bw0MQ5PVJ4hRFoORw4rRLUfWNI6nEGe UGg67XRyUGCWiMfJRPCupoc8hnyz/2edQ6gYefE6QRPFCwti+UR/QaURdLFR/tviNOVo/Bs2 jzUMV6G6n1utiGWQcoI8oissXEGpdgl7NFYEDKH0kO/ODQ1XyCNVe/by2rgtWp2aF6zIhyGV XvJ9Ls/CFGyUKoHfwfPxvPbvVsLIJutR6HePAO/r91MD1SPui74bE4K9Ita4yBbf8aN/PJV5 K9Ylrs9XJCce0G+f3YJ04Ea+2mhJianI78i2ddWm9O/0ejtasOiJIdgnKIjJUQ+wPptCAm60 azxJbBjtdlv9cIbnBrtn2eVPppitvbW50Z8bi0oDi1oDEjNWX1ix+VNE3SklKUSr5s8itILq N31b1tuCAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrMIsWRmVeSWpSXmKPExsVy+t/xe7qeCrGxBn/axS02zljPanH9y3NW i/lHzrFarP74mNGiefF6NovJp+YyWZzpzrXof/ya2eL8+Q3sFmeb3rBb3GqQsfjYc4/V4vKu OWwWn3uPMFrMOL+PyWLtkbvsFkuvX2SyuHjK1eJ24wo2i9a9R9gtDr9pZ7X4d20ji8X+K14W t3/zWXw78YjRQdJjzbw1jB7fvk5i8Xh/o5XdY3bDRRaPnbPusntsWtXJ5rF/7hp2j97md2we B9/tYfLo27KK0WPz6WqPz5vkAnii9GyK8ktLUhUy8otLbJWiDS2M9AwtLfSMTCz1DI3NY62M TJX07WxSUnMyy1KL9O0S9DK2NKYU9MlX7Fx5lbWB8blkFyMnh4SAiUTHlD62LkYuDiGBpYwS f5a/YYZIiElM2redHcIWlvhzrQuq6BOjRP/CE0BFHBxsAnoSO1YVgsRFBOYwSvzs2sYI4jAL /GaWOHi3H6xbWCBe4tjvH6wgDSwCqhIfX5SChHkF7CUWLJnBCrFAXmL1hgNgizkFHCT+TTgJ FhcCqpm64S3rBEa+BYwMqxhFUkuLc9Nzi430ihNzi0vz0vWS83M3MQIjdNuxn1t2MHa9Cz7E KMDBqMTDu+NmdKwQa2JZcWXuIUYJDmYlEd6KOVGxQrwpiZVVqUX58UWlOanFhxhNgW6ayCwl mpwPTB55JfGGpobmFpaG5sbmxmYWSuK8HQIHY4QE0hNLUrNTUwtSi2D6mDg4pRoY+5XM433/ c6jr/Tn20GNq7Dr3/7cEtA0uxvCvV52mf/hkQt0m34N76lYfX+A5+5wK+8GfpRs3K1inGTDp VYjkvn7atDmcYZ6jh/N/C7ZlsRs2W15vi+58WOXM+jD29zymGR5uAfP/as/sU1WdmcNz0lnx +u3p511ldZzMM0RdWU+fDOZ5eXqpEktxRqKhFnNRcSIAgzYIleYCAAA= X-CMS-MailID: 20190821104321eucas1p284816ade1890e9660008c0428c6d56e0 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20190821104321eucas1p284816ade1890e9660008c0428c6d56e0 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20190821104321eucas1p284816ade1890e9660008c0428c6d56e0 References: <20190821104303.32079-1-l.luba@partner.samsung.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The patch adds description for DT binding for a new Exynos5422 Dynamic Memory Controller device. Acked-by: Krzysztof Kozlowski Reviewed-by: Rob Herring Signed-off-by: Lukasz Luba --- .../memory-controllers/exynos5422-dmc.txt | 73 +++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt diff --git a/Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt b/Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt new file mode 100644 index 000000000000..02aeb3b5a820 --- /dev/null +++ b/Documentation/devicetree/bindings/memory-controllers/exynos5422-dmc.txt @@ -0,0 +1,73 @@ +* Exynos5422 frequency and voltage scaling for Dynamic Memory Controller device + +The Samsung Exynos5422 SoC has DMC (Dynamic Memory Controller) to which the DRAM +memory chips are connected. The driver is to monitor the controller in runtime +and switch frequency and voltage. To monitor the usage of the controller in +runtime, the driver uses the PPMU (Platform Performance Monitoring Unit), which +is able to measure the current load of the memory. +When 'userspace' governor is used for the driver, an application is able to +switch the DMC and memory frequency. + +Required properties for DMC device for Exynos5422: +- compatible: Should be "samsung,exynos5422-dmc". +- clocks : list of clock specifiers, must contain an entry for each + required entry in clock-names for CLK_FOUT_SPLL, CLK_MOUT_SCLK_SPLL, + CLK_FF_DOUT_SPLL2, CLK_FOUT_BPLL, CLK_MOUT_BPLL, CLK_SCLK_BPLL, + CLK_MOUT_MX_MSPLL_CCORE, CLK_MOUT_MX_MSPLL_CCORE_PHY, CLK_MOUT_MCLK_CDREX, +- clock-names : should include "fout_spll", "mout_sclk_spll", "ff_dout_spll2", + "fout_bpll", "mout_bpll", "sclk_bpll", "mout_mx_mspll_ccore", + "mout_mclk_cdrex" entries +- devfreq-events : phandles for PPMU devices connected to this DMC. +- vdd-supply : phandle for voltage regulator which is connected. +- reg : registers of two CDREX controllers. +- operating-points-v2 : phandle for OPPs described in v2 definition. +- device-handle : phandle of the connected DRAM memory device. For more + information please refer to documentation file: + Documentation/devicetree/bindings/ddr/lpddr3.txt +- devfreq-events : phandles of the PPMU events used by the controller. +- samsung,syscon-clk : phandle of the clock register set used by the controller, + these registers are used for enabling a 'pause' feature and are not + exposed by clock framework but they must be used in a safe way. + The register offsets are in the driver code and specyfic for this SoC + type. + +Example: + + ppmu_dmc0_0: ppmu@10d00000 { + compatible = "samsung,exynos-ppmu"; + reg = <0x10d00000 0x2000>; + clocks = <&clock CLK_PCLK_PPMU_DREX0_0>; + clock-names = "ppmu"; + events { + ppmu_event_dmc0_0: ppmu-event3-dmc0_0 { + event-name = "ppmu-event3-dmc0_0"; + }; + }; + }; + + dmc: memory-controller@10c20000 { + compatible = "samsung,exynos5422-dmc"; + reg = <0x10c20000 0x100>, <0x10c30000 0x100>, + clocks = <&clock CLK_FOUT_SPLL>, + <&clock CLK_MOUT_SCLK_SPLL>, + <&clock CLK_FF_DOUT_SPLL2>, + <&clock CLK_FOUT_BPLL>, + <&clock CLK_MOUT_BPLL>, + <&clock CLK_SCLK_BPLL>, + <&clock CLK_MOUT_MX_MSPLL_CCORE>, + <&clock CLK_MOUT_MCLK_CDREX>, + clock-names = "fout_spll", + "mout_sclk_spll", + "ff_dout_spll2", + "fout_bpll", + "mout_bpll", + "sclk_bpll", + "mout_mx_mspll_ccore", + "mout_mclk_cdrex", + operating-points-v2 = <&dmc_opp_table>; + devfreq-events = <&ppmu_event3_dmc0_0>, <&ppmu_event3_dmc0_1>, + <&ppmu_event3_dmc1_0>, <&ppmu_event3_dmc1_1>; + device-handle = <&samsung_K3QF2F20DB>; + vdd-supply = <&buck1_reg>; + samsung,syscon-clk = <&clock>; + }; -- 2.17.1