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Crestez To: "robh@kernel.org" Subject: Re: [PATCH v3 6/6] arm64: dts: imx8m: Add ddr controller nodes Thread-Topic: [PATCH v3 6/6] arm64: dts: imx8m: Add ddr controller nodes Thread-Index: AQHVkDU8koftI2DJ20m2SpBhGeGQAqd7lnkAgAqB44A= Date: Mon, 11 Nov 2019 14:29:15 +0000 Message-ID: References: <44dcab5a136f5b046092e6ed456d8e206413059f.1572558427.git.leonard.crestez@nxp.com> <20191104220144.GA5218@bogus> In-Reply-To: <20191104220144.GA5218@bogus> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Evolution 3.28.5-0ubuntu0.18.04.1 authentication-results: spf=none (sender IP is ) smtp.mailfrom=leonard.crestez@nxp.com; x-originating-ip: [89.37.124.34] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 5cf86961-a53b-47b0-7f1b-08d766b3878a x-ms-traffictypediagnostic: VI1PR04MB2975:|VI1PR04MB2975: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: 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Lxy38Ddk/G+ZjwGesRj3xCcaC5POg/PgpNxTihXuheqswFTnBAnrECRSA7ryV+X+EEesyWRrr4RDSUJ3n1BHIg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR04MB2975 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191111_062921_511832_D189391F X-CRM114-Status: GOOD ( 22.80 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "mark.rutland@arm.com" , "a.swigon@partner.samsung.com" , Jacky Bai , "viresh.kumar@linaro.org" , "mturquette@baylibre.com" , "angus@akkea.ca" , "myungjoo.ham@samsung.com" , "linux-clk@vger.kernel.org" , Abel Vesa , Anson Huang , "krzk@kernel.org" , "cw00.choi@samsung.com" , "mka@chromium.org" , dl-linux-imx , "devicetree@vger.kernel.org" , "linux-pm@vger.kernel.org" , "martink@posteo.de" , "linux-arm-kernel@lists.infradead.org" , Aisheng Dong , "saravanak@google.com" , "sboyd@kernel.org" , "rjw@rjwysocki.net" , "kyungmin.park@samsung.com" , "kernel@pengutronix.de" , Fabio Estevam , "shawnguo@kernel.org" , "georgi.djakov@linaro.org" , "abailon@baylibre.com" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 2019-11-04 at 16:01 -0600, Rob Herring wrote: > On Thu, Oct 31, 2019 at 11:50:27PM +0200, Leonard Crestez wrote: > > This is used by the imx-ddrc devfreq driver to implement dynamic > > frequency scaling of DRAM. > > > > Add a devfreq-event link to the dram PMU in order to support on- > > demand scaling of ddrc based on measured dram bandwidth usage. > > > > Support for proactive scaling via interconnect will come later. The > > high-performance bus masters which need that (display, vpu, gpu) > > are not yet enabled in upstream anyway. > > > > Signed-off-by: Leonard Crestez > > --- > > arch/arm64/boot/dts/freescale/imx8mm-evk.dts | 18 ++++++++++++++ > > arch/arm64/boot/dts/freescale/imx8mm.dtsi | 17 ++++++++++++- > > .../boot/dts/freescale/imx8mn-ddr4-evk.dts | 18 ++++++++++++++ > > arch/arm64/boot/dts/freescale/imx8mn.dtsi | 16 ++++++++++++- > > arch/arm64/boot/dts/freescale/imx8mq-evk.dts | 24 > > +++++++++++++++++++ > > arch/arm64/boot/dts/freescale/imx8mq.dtsi | 16 ++++++++++++- > > 6 files changed, 106 insertions(+), 3 deletions(-) > > > > diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts > > b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts > > index 4f5e408d6e6a..be9abd8e4478 100644 > > --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts > > +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts > > @@ -69,16 +69,34 @@ > > simple-audio-card,codec { > > sound-dai = <&wm8524>; > > clocks = <&clk IMX8MM_CLK_SAI3_ROOT>; > > }; > > }; > > + > > + ddrc_opp_table: ddrc-opp-table { > > + compatible = "operating-points-v2"; > > + > > + opp-25M { > > + opp-hz = /bits/ 64 <25000000>; > > + }; > > + opp-100M { > > + opp-hz = /bits/ 64 <100000000>; > > + }; > > + opp-750M { > > + opp-hz = /bits/ 64 <750000000>; > > + }; > > + }; > > }; > > > > &A53_0 { > > cpu-supply = <&buck2_reg>; > > }; > > > > +&ddrc { > > + operating-points-v2 = <&ddrc_opp_table>; > > +}; > > + > > &fec1 { > > pinctrl-names = "default"; > > pinctrl-0 = <&pinctrl_fec1>; > > phy-mode = "rgmii-id"; > > phy-handle = <ðphy0>; > > diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi > > b/arch/arm64/boot/dts/freescale/imx8mm.dtsi > > index 6edbdfe2d0d7..5404870d80d5 100644 > > --- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi > > +++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi > > @@ -856,11 +856,26 @@ > > #interrupt-cells = <3>; > > interrupt-controller; > > interrupts = ; > > }; > > > > - ddr-pmu@3d800000 { > > + ddrc: dram-controller@3d400000 { > > + compatible = "fsl,imx8mm-ddrc", "fsl,imx8m- > > ddrc"; > > + reg = <0x3d400000 0x400000>; > > Do you really need the OS to map 4MB of register space? Virtual > space on 64-bit doesn't matter, but it's still wasting 2KB of memory > just to map all that if only a few pages are needed. Adds up if the > whole DT is done this way. This driver doesn't actually map registers, they're only touched from firmware. Information is from memory map. > > + clock-names = "dram_core", > > + "dram_pll", > > + "dram_alt", > > + "dram_apb"; > > + clocks = <&clk IMX8MM_CLK_DRAM_CORE>, > > + <&clk IMX8MM_DRAM_PLL>, > > + <&clk IMX8MM_CLK_DRAM_ALT>, > > + <&clk IMX8MM_CLK_DRAM_APB>; > > + devfreq-events = <&ddr_pmu>; > > + operating-points-v2 = <&ddrc_opp_table>; > > + }; > > + > > + ddr_pmu: ddr-pmu@3d800000 { > > compatible = "fsl,imx8mm-ddr-pmu", "fsl,imx8m- > > ddr-pmu"; > > reg = <0x3d800000 0x400000>; > > interrupt-parent = <&gic>; > > interrupts = ; > > }; > > diff --git a/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts > > b/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts > > index 071949412caf..ab2060667671 100644 > > --- a/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts > > +++ b/arch/arm64/boot/dts/freescale/imx8mn-ddr4-evk.dts > > @@ -9,16 +9,34 @@ > > #include "imx8mn-evk.dtsi" > > > > / { > > model = "NXP i.MX8MNano DDR4 EVK board"; > > compatible = "fsl,imx8mn-ddr4-evk", "fsl,imx8mn"; > > + > > + ddrc_opp_table: ddrc-opp-table { > > I think it would be better to put this under the ddrc node (and > named 'opp-table'). Yes, it's kind of silly to have a phandle to a > child node, but that still works. That looks much nicer, fixed in v4. I had to also update yaml to explicitly allow an "opp-table" child. -- Regards, Leonard _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel