[PATCH V4 4/6] arm64/ls1043a: add DTS for Freescale LS1043A SoC
Hou Zhiqiang
B48286 at freescale.com
Thu Oct 15 20:36:31 PDT 2015
> -----Original Message-----
> From: Wood Scott-B07421
> Sent: 2015年10月16日 4:46
> To: Hou Zhiqiang-B48286
> Cc: linux-arm-kernel at lists.infradead.org; catalin.marinas at arm.com;
> will.deacon at arm.com; linux-i2c at vger.kernel.org; linux-
> watchdog at vger.kernel.org; linux-doc at vger.kernel.org; linux-
> clk at vger.kernel.org; mark.rutland at arm.com; linux at roeck-us.net; wsa at the-
> dreams.de; wim at iguana.be; corbet at lwn.net; mturquette at baylibre.com;
> sboyd at codeaurora.org; Hu Mingkai-B21284; Xie Shaohui-B21989; Sharma
> Bhupesh-B45370; Song Wenbin-B53747; Li Yang-Leo-R58472; Sharma Bhupesh-
> B45370
> Subject: Re: [PATCH V4 4/6] arm64/ls1043a: add DTS for Freescale LS1043A
> SoC
>
> On Thu, 2015-10-15 at 20:12 +0800, Zhiqiang Hou wrote:
> > From: Mingkai Hu <Mingkai.Hu at freescale.com>
> >
> > LS1043a is an SoC with 4 ARMv8 A53 cores and most other IP blocks
> > similar to LS1021a which complies to Chassis 2.1 spec.
> >
> > Following levels of DTSI/DTS files have been created for the LS1043A
> > SoC family:
> >
> > - fsl-ls1043a.dtsi:
> > DTS-Include file for FSL LS1043A SoC.
> >
> > Signed-off-by: Li Yang <leoli at freescale.com>
> > Signed-off-by: Hou Zhiqiang <B48286 at freescale.com>
> > Signed-off-by: Mingkai Hu <Mingkai.Hu at freescale.com>
> > Signed-off-by: Wenbin Song <Wenbin.Song at freescale.com>
> > ---
> > V4:
> > - Add soc node with simple-bus compatible.
> > - Add property interrupt-affinity for armv8 pmuv3 node.
> >
> > V3:
> > - Add device tree node for SATA.
> > - Remove properity enable-method for all cpu node.
> > Remove reserved memory region for spin-table.
> >
> > V2:
> > - Add secondary core boot method.
> > - Move out the sysclk node from the clockgen node.
> > - Correct the reg size of GICC.
> >
> > arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi | 525
> > +++++++++++++++++++++++++
> > 1 file changed, 525 insertions(+)
> > create mode 100644 arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi
> >
> > diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi
> > b/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi
> > new file mode 100644
> > index 0000000..1a5bf79
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/freescale/fsl-ls1043a.dtsi
> > @@ -0,0 +1,525 @@
> > +/*
> > + * Device Tree Include file for Freescale Layerscape-1043A family SoC.
> > + *
> > + * Copyright 2014-2015, Freescale Semiconductor
> > + *
> > + * Mingkai Hu <Mingkai.hu at freescale.com>
> > + *
> > + * This file is dual-licensed: you can use it either under the terms
> > + * of the GPLv2 or the X11 license, at your option. Note that this
> > +dual
> > + * licensing only applies to this file, and not this project as a
> > + * whole.
> > + *
> > + * a) This library is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License as
> > + * published by the Free Software Foundation; either version 2 of
> the
> > + * License, or (at your option) any later version.
> > + *
> > + * This library is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > + * GNU General Public License for more details.
> > + *
> > + * Or, alternatively,
> > + *
> > + * b) Permission is hereby granted, free of charge, to any person
> > + * obtaining a copy of this software and associated documentation
> > + * files (the "Software"), to deal in the Software without
> > + * restriction, including without limitation the rights to use,
> > + * copy, modify, merge, publish, distribute, sublicense, and/or
> > + * sell copies of the Software, and to permit persons to whom the
> > + * Software is furnished to do so, subject to the following
> > + * conditions:
> > + *
> > + * The above copyright notice and this permission notice shall be
> > + * included in all copies or substantial portions of the Software.
> > + *
> > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> > + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
> > + * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
> > + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
> > + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
> > + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> > + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> > + * OTHER DEALINGS IN THE SOFTWARE.
> > + */
> > +
> > +/ {
> > + compatible = "fsl,ls1043a";
> > + interrupt-parent = <&gic>;
> > + #address-cells = <2>;
> > + #size-cells = <2>;
> > +
> > + cpus {
> > + #address-cells = <2>;
> > + #size-cells = <0>;
> > +
> > + /*
> > + * We expect the enable-method for cpu's to be "psci",
> but this
> > + * is dependent on the SoC FW, which will fill this in.
> > + *
> > + * Currently supported enable-method is psci v0.2
> > + */
> > + cpu0: cpu at 0{
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a53";
> > + reg = <0x0 0x0>;
> > + clocks = <&clockgen 1 0>;
> > + };
> > +
> > + cpu1: cpu at 1{
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a53";
> > + reg = <0x0 0x1>;
> > + clocks = <&clockgen 1 0>;
> > + };
> > +
> > + cpu2: cpu at 2{
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a53";
> > + reg = <0x0 0x2>;
> > + clocks = <&clockgen 1 0>;
> > + };
> > +
> > + cpu3: cpu at 3{
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a53";
> > + reg = <0x0 0x3>;
> > + clocks = <&clockgen 1 0>;
> > + };
> > + };
> > +
> > + memory at 80000000{
> > + device_type = "memory";
> > + reg = <0x0 0x80000000 0 0x80000000>;
> > + /* DRAM space 1, size: 2GiB DRAM */
> > + };
> > +
> > + sysclk: sysclk {
> > + compatible = "fixed-clock";
> > + #clock-cells = <0>;
> > + clock-frequency = <100000000>;
> > + clock-output-names = "sysclk";
> > + };
> > +
> > + soc {
> > + compatible = "simple-bus";
> > + #address-cells = <2>;
> > + #size-cells = <2>;
> > + ranges;
> > +
> > + clockgen: clocking at 1ee1000{
> > + compatible = "fsl,ls1043a-clockgen";
> > + reg = <0x0 0x1ee1000 0x0 0x1000>;
> > + #clock-cells = <2>;
> > + clocks = <&sysclk>;
> > + };
> > +
> > + timer {
> > + compatible = "arm,armv8-timer";
> > + interrupts = <1 13 0x1>, /* Physical Secure PPI
> */
> > + <1 14 0x1>, /* Physical Non-Secure
> PPI */
> > + <1 11 0x1>, /* Virtual PPI */
> > + <1 10 0x1>; /* Hypervisor PPI */
> > + };
> > +
> > + pmu {
> > + compatible = "arm,armv8-pmuv3";
> > + interrupts = <0 106 0x4>,
> > + <0 107 0x4>,
> > + <0 95 0x4>,
> > + <0 97 0x4>;
> > + interrupt-affinity = <&cpu0>,
> > + <&cpu1>,
> > + <&cpu2>,
> > + <&cpu3>;
> > + };
> > +
> > + gic: interrupt-controller at 1400000{
> > + compatible = "arm,gic-400";
> > + #interrupt-cells = <3>;
> > + interrupt-controller;
> > + reg = <0x0 0x1401000 0 0x1000>, /* GICD */
> > + <0x0 0x1402000 0 0x2000>, /* GICC */
> > + <0x0 0x1404000 0 0x2000>, /* GICH */
> > + <0x0 0x1406000 0 0x2000>; /* GICV */
> > + interrupts = <1 9 0xf08>;
> > + };
>
> The recently posted ls2080 device tree patch puts pmu, gic, etc. under
> the root node rather than the soc node. Where should they go? At least
> it should be consistent...
Why treat pmu, gic and timer as special? Who can explain it?
I find some venders put the gic and/or timer node under the soc node, such as
arch/arm64/boot/dts/marvell/berlin4ct.dtsi,
arch/arm64/boot/dts/mediatek/mt8173.dtsi and
arch/arm64/boot/dts/qcom/msm8916.dtsi.
So I put them underneath the soc node.
Thanks,
Zhiqiang
More information about the linux-arm-kernel
mailing list