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Fri, 30 Oct 2020 12:52:56 +0000 (GMT) From: Sylwester Nawrocki To: georgi.djakov@linaro.org, cw00.choi@samsung.com, krzk@kernel.org Cc: devicetree@vger.kernel.org, robh+dt@kernel.org, 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-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org, dri-devel@lists.freedesktop.org, s.nawrocki@samsung.com Subject: [PATCH v7 1/6] dt-bindings: devfreq: Add documentation for the interconnect properties Date: Fri, 30 Oct 2020 13:51:44 +0100 Message-Id: <20201030125149.8227-2-s.nawrocki@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201030125149.8227-1-s.nawrocki@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA01Sa0iTYRTu3Xd1OPmcQidNpVVENy0VeskIK8FFFCZdqChb+qWSTtmcZWho XvLeULw0RU2CmRmaqYhZ1FyNsBxYmaU2UtOUIkrNS6I1v1X+e57zPs85zzm8LCHtpFzYSGUc r1IqomS0mGx5Nmveetu+PGTbwH0PbKlIR/heaT2F306OUrjS2EXh11PfaFzysJHGBRYtic3m Bga/aiun8USeEeFS8yMRvmscYHBfSg2N0x8aGdzx5RqFSwvHaH9O3libRcv7e9ppuSXHJJLn N9Ui+USjexB1UrwrjI+KjOdVXrvPiiNGFg1kbIHs0q2KaSYZ9bpmI5YFzhdGDFuzkZiVcjUI MhfyGIFMIpi5WoYEMoGgskhPZCO7JcfQVIVNpUdwM6WO/md539xHW1U0tx3ynuYjK3bmAiDj UwVpxQQ3KILUyqVOTpwCetI/UVZMcuuhTm9a8kq4nVA0+M42zQPuNDxewnacH2Rn9YoEjSM8 vzFs6+kBqc1lhDUEcGMMzPV/FgnmAPj4os3WyAnGTU2MgFdDZ2EuKRhSEeQ+6GMEokVgMVUh QeUH/V1ztPVMBLcR6tu8hPIe+DndzgjXc4Der45CCAcoaCkhhLIEMjOkgnod/KotscVxgZzh RVKQyOFed6AWrdEt20a3bBvd/7FViKhFK3mNOjqcV3sr+YueakW0WqMM9wyNiW5Ef75Y54Jp shW1zZ8zII5FMnuJv0dZiJRSxKsTog0IWELmLNn7svOMVBKmSLjMq2JCVJooXm1AriwpWynx qR47LeXCFXH8BZ6P5VV/X0WsnUsy4oYuTZgSVySJfI7oR9GPYK278btsH/Stnd9x0NkTH7Ls D7mg32vXcSBtxxU3J2pD60xHpHdo8eGomIvHG0SnkLsk9smT7tlB7y2rzO1zscP5gVPVpfGJ yrhpTY2v+Ktj8BtNd9XgseK0zdJWt8ij57t0SUHV11oKtSfOjJ9H1z/ISHWEYvsmQqVW/AaI e8CKXgMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrPIsWRmVeSWpSXmKPExsVy+t/xe7oreebEGzyYzW5xf14ro8XGGetZ La5/ec5qMf/IOVaLK1/fs1lM37uJzWLS/QksFufPb2C3uLxrDpvF594jjBYzzu9jslh75C67 xe3GFWwWrXuPsFscftPOajFj8ks2BwGPTas62TzuXNvD5nG/+ziTR9+WVYwenzfJBbBG6dkU 5ZeWpCpk5BeX2CpFG1oY6RlaWugZmVjqGRqbx1oZmSrp29mkpOZklqUW6dsl6GU8+3+IpWCS UsWSed/ZGxhvSHcxcnJICJhIPP46j72LkYtDSGApo0TjjaVADgdQQkpifosSRI2wxJ9rXWwQ NZ8YJQ5Ma2UHSbAJGEr0Hu1jBLFFBDwkTrWuZQUpYhb4wCSx9kEvWEJYIF5iwrN7YDaLgKrE muXH2UBsXgEriamPbjJDbJCXWL3hAJjNKWAt0dV5gwnkCCGgmrcHqiDKBSVOznzCAhJmFlCX WD9PCCTMDNTZvHU28wRGwVlIqmYhVM1CUrWAkXkVo0hqaXFuem6xkV5xYm5xaV66XnJ+7iZG YGRuO/Zzyw7GrnfBhxgFOBiVeHgd5GfHC7EmlhVX5h5ilOBgVhLhdTp7Ok6INyWxsiq1KD++ qDQntfgQoynQZxOZpUST84FJI68k3tDU0NzC0tDc2NzYzEJJnLdD4GCMkEB6YklqdmpqQWoR TB8TB6dUA6PKhWiX/e0m1ziTrKYXHL3RFnSy8NATrm3nV3uqCrOnPcne3vE+2cteoVCg3ELk Xl7wD+3vN4pmME/YY9nSMuHX2UbT/isb43P/it14ruPuOnnrmxNMahemzak9fOrhXWk7g9cH mllkri/1bApgKGHpX/5wR/rvoNNvfbes3/OuaW1Qr3Rl2jUlluKMREMt5qLiRADQU3/74gIA AA== X-CMS-MailID: 20201030125257eucas1p29c6b018cfcdda337b2b3d2a496f0c830 X-Msg-Generator: CA X-RootMTR: 20201030125257eucas1p29c6b018cfcdda337b2b3d2a496f0c830 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20201030125257eucas1p29c6b018cfcdda337b2b3d2a496f0c830 References: <20201030125149.8227-1-s.nawrocki@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org Add documentation for new optional properties in the exynos bus nodes: interconnects, #interconnect-cells, samsung,data-clock-ratio. 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 Acked-by: Krzysztof Kozlowski --- Changes for v7: - bus-width property replaced with samsung,data-clock-ratio, - the interconnect consumer bindings used instead of vendor specific properties Changes for v6: - added dts example of bus hierarchy definition and the interconnect consumer, - added new bus-width property. Changes for v5: - exynos,interconnect-parent-node renamed to samsung,interconnect-parent --- .../devicetree/bindings/devfreq/exynos-bus.txt | 68 +++++++++++++++++++++- 1 file changed, 66 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt index e71f752..e34175c 100644 --- a/Documentation/devicetree/bindings/devfreq/exynos-bus.txt +++ b/Documentation/devicetree/bindings/devfreq/exynos-bus.txt @@ -51,6 +51,16 @@ 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): +- #interconnect-cells: should be 0. +- interconnects: as documented in ../interconnect.txt, describes a path + at the higher level interconnects used by this interconnect provider. + If this interconnect provider is a parent of a top level interconnect + provider the property contains only one phandle. + +- samsung,data-clock-ratio: ratio of the data troughput in B/s to minimum data + clock frequency in Hz, default value is 8 when this property is missing. + 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 @@ -135,7 +145,7 @@ Detailed correlation between sub-blocks and power line according to Exynos SoC: |--- PERIC (Fixed clock rate) |--- FSYS (Fixed clock rate) -Example1: +Example 1: Show the AXI buses of Exynos3250 SoC. Exynos3250 divides the buses to power line (regulator). The MIF (Memory Interface) AXI bus is used to transfer data between DRAM and CPU and uses the VDD_MIF regulator. @@ -184,7 +194,7 @@ Example1: |L5 |200000 |200000 |400000 |300000 | ||1000000 | ---------------------------------------------------------- -Example2 : +Example 2: The bus of DMC (Dynamic Memory Controller) block in exynos3250.dtsi is listed below: @@ -419,3 +429,57 @@ Example2 : devfreq = <&bus_leftbus>; status = "okay"; }; + +Example 3: + An interconnect path "bus_display -- bus_leftbus -- bus_dmc" on + Exynos4412 SoC with video mixer as an interconnect consumer device. + + soc { + bus_dmc: bus_dmc { + compatible = "samsung,exynos-bus"; + clocks = <&clock CLK_DIV_DMC>; + clock-names = "bus"; + operating-points-v2 = <&bus_dmc_opp_table>; + samsung,data-clock-ratio = <4>; + #interconnect-cells = <0>; + }; + + bus_leftbus: bus_leftbus { + compatible = "samsung,exynos-bus"; + clocks = <&clock CLK_DIV_GDL>; + clock-names = "bus"; + operating-points-v2 = <&bus_leftbus_opp_table>; + #interconnect-cells = <0>; + interconnects = <&bus_dmc>; + }; + + bus_display: bus_display { + compatible = "samsung,exynos-bus"; + clocks = <&clock CLK_ACLK160>; + clock-names = "bus"; + operating-points-v2 = <&bus_display_opp_table>; + #interconnect-cells = <0>; + interconnects = <&bus_leftbus &bus_dmc>; + }; + + bus_dmc_opp_table: opp_table1 { + compatible = "operating-points-v2"; + /* ... */ + } + + bus_leftbus_opp_table: opp_table3 { + compatible = "operating-points-v2"; + /* ... */ + }; + + bus_display_opp_table: opp_table4 { + compatible = "operating-points-v2"; + /* .. */ + }; + + &mixer { + compatible = "samsung,exynos4212-mixer"; + interconnects = <&bus_display &bus_dmc>; + /* ... */ + }; + };