Re: [PATCH v4 3/5] RISC-V: Initial DTS for Microchip ICICLE board

From: Vitaly Wool
Date: Sun Apr 18 2021 - 14:40:01 EST

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In reply to: Atish Patra: "Re: [PATCH v4 3/5] RISC-V: Initial DTS for Microchip ICICLE board"
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Hi Atish,

On Sun, Apr 18, 2021 at 5:37 AM Atish Patra <atishp@xxxxxxxxxxxxxx> wrote:
>
> On Mon, Mar 29, 2021 at 10:04 AM Vitaly Wool <vitaly.wool@xxxxxxxxxxxx> wrote:
> >
> > On Sat, Mar 27, 2021 at 6:24 PM Alex Ghiti <alex@xxxxxxxx> wrote:
> > >
> > > Hi Atish,
> > >
> > > Le 3/3/21 à 3:02 PM, Atish Patra a écrit :
> > > > Add initial DTS for Microchip ICICLE board having only
> > > > essential devices (clocks, sdhci, ethernet, serial, etc).
> > > > The device tree is based on the U-Boot patch.
> > > >
> > > > https://patchwork.ozlabs.org/project/uboot/patch/20201110103414.10142-6-padmarao.begari@xxxxxxxxxxxxx/
> > > >
> > > > Signed-off-by: Atish Patra <atish.patra@xxxxxxx>
> > > > ---
> > > > arch/riscv/boot/dts/Makefile | 1 +
> > > > arch/riscv/boot/dts/microchip/Makefile | 2 +
> > > > .../microchip/microchip-mpfs-icicle-kit.dts | 72 ++++
> > > > .../boot/dts/microchip/microchip-mpfs.dtsi | 329 ++++++++++++++++++
> > > > 4 files changed, 404 insertions(+)
> > > > create mode 100644 arch/riscv/boot/dts/microchip/Makefile
> > > > create mode 100644 arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts
> > > > create mode 100644 arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
> > > >
> > > > diff --git a/arch/riscv/boot/dts/Makefile b/arch/riscv/boot/dts/Makefile
> > > > index 7ffd502e3e7b..fe996b88319e 100644
> > > > --- a/arch/riscv/boot/dts/Makefile
> > > > +++ b/arch/riscv/boot/dts/Makefile
> > > > @@ -1,5 +1,6 @@
> > > > # SPDX-License-Identifier: GPL-2.0
> > > > subdir-y += sifive
> > > > subdir-$(CONFIG_SOC_CANAAN_K210_DTB_BUILTIN) += canaan
> > > > +subdir-y += microchip
> > > >
> > > > obj-$(CONFIG_BUILTIN_DTB) := $(addsuffix /, $(subdir-y))
> > > > diff --git a/arch/riscv/boot/dts/microchip/Makefile b/arch/riscv/boot/dts/microchip/Makefile
> > > > new file mode 100644
> > > > index 000000000000..622b12771fd3
> > > > --- /dev/null
> > > > +++ b/arch/riscv/boot/dts/microchip/Makefile
> > > > @@ -0,0 +1,2 @@
> > > > +# SPDX-License-Identifier: GPL-2.0
> > > > +dtb-$(CONFIG_SOC_MICROCHIP_POLARFIRE) += microchip-mpfs-icicle-kit.dtb
> > >
> > > I'm playing (or trying to...) with XIP_KERNEL and I had to add the
> > > following to have the device tree actually builtin the kernel:
> > >
> > > diff --git a/arch/riscv/boot/dts/microchip/Makefile
> > > b/arch/riscv/boot/dts/microchip/Makefile
> > > index 622b12771fd3..855c1502d912 100644
> > > --- a/arch/riscv/boot/dts/microchip/Makefile
> > > +++ b/arch/riscv/boot/dts/microchip/Makefile
> > > @@ -1,2 +1,3 @@
> > > # SPDX-License-Identifier: GPL-2.0
> > > dtb-$(CONFIG_SOC_MICROCHIP_POLARFIRE) += microchip-mpfs-icicle-kit.dtb
> > > +obj-$(CONFIG_BUILTIN_DTB) += $(addsuffix .o, $(dtb-y))
> > >
> > > Alex
> >
> > Yes, I believe this is necessary for BUILTIN_DTB to work on Polarfire,
> > regardless of whether the kernel is XIP or not.
> >
>
> But there is no usecase for BUILTIN_DTB for polarfire except XIP kernel.
> The bootloaders for polarfire is capable of providing a DTB to kernel.

I have hard time seeing an industrial application with a bootloader
mounting a vfat partition to load a device tree file. So there has to
be a less obscure and less time consuming alternative. And if the
mainline kernel doesn't provide it (e. g. in the form of support for
BUILTIN_DTB) it opens up for error prone custom solutions from various
vendors. Is that really what we want?

Best regards,
Vitaly

> If XIP kernel is enabled, the following line in
> arch/riscv/boot/dts/Makefile should take care of things
>
>
> > Best regards,
> > Vitaly
> >
> > > > diff --git a/arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts b/arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts
> > > > new file mode 100644
> > > > index 000000000000..ec79944065c9
> > > > --- /dev/null
> > > > +++ b/arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dts
> > > > @@ -0,0 +1,72 @@
> > > > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > > > +/* Copyright (c) 2020 Microchip Technology Inc */
> > > > +
> > > > +/dts-v1/;
> > > > +
> > > > +#include "microchip-mpfs.dtsi"
> > > > +
> > > > +/* Clock frequency (in Hz) of the rtcclk */
> > > > +#define RTCCLK_FREQ 1000000
> > > > +
> > > > +/ {
> > > > + #address-cells = <2>;
> > > > + #size-cells = <2>;
> > > > + model = "Microchip PolarFire-SoC Icicle Kit";
> > > > + compatible = "microchip,mpfs-icicle-kit";
> > > > +
> > > > + chosen {
> > > > + stdout-path = &serial0;
> > > > + };
> > > > +
> > > > + cpus {
> > > > + timebase-frequency = <RTCCLK_FREQ>;
> > > > + };
> > > > +
> > > > + memory@80000000 {
> > > > + device_type = "memory";
> > > > + reg = <0x0 0x80000000 0x0 0x40000000>;
> > > > + clocks = <&clkcfg 26>;
> > > > + };
> > > > +
> > > > + soc {
> > > > + };
> > > > +};
> > > > +
> > > > +&serial0 {
> > > > + status = "okay";
> > > > +};
> > > > +
> > > > +&serial1 {
> > > > + status = "okay";
> > > > +};
> > > > +
> > > > +&serial2 {
> > > > + status = "okay";
> > > > +};
> > > > +
> > > > +&serial3 {
> > > > + status = "okay";
> > > > +};
> > > > +
> > > > +&sdcard {
> > > > + status = "okay";
> > > > +};
> > > > +
> > > > +&emac0 {
> > > > + phy-mode = "sgmii";
> > > > + phy-handle = <&phy0>;
> > > > + phy0: ethernet-phy@8 {
> > > > + reg = <8>;
> > > > + ti,fifo-depth = <0x01>;
> > > > + };
> > > > +};
> > > > +
> > > > +&emac1 {
> > > > + status = "okay";
> > > > + phy-mode = "sgmii";
> > > > + phy-handle = <&phy1>;
> > > > + phy1: ethernet-phy@9 {
> > > > + reg = <9>;
> > > > + ti,fifo-depth = <0x01>;
> > > > + };
> > > > +};
> > > > diff --git a/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi b/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
> > > > new file mode 100644
> > > > index 000000000000..b9819570a7d1
> > > > --- /dev/null
> > > > +++ b/arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi
> > > > @@ -0,0 +1,329 @@
> > > > +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > > > +/* Copyright (c) 2020 Microchip Technology Inc */
> > > > +
> > > > +/dts-v1/;
> > > > +
> > > > +/ {
> > > > + #address-cells = <2>;
> > > > + #size-cells = <2>;
> > > > + model = "Microchip MPFS Icicle Kit";
> > > > + compatible = "microchip,mpfs-icicle-kit";
> > > > +
> > > > + chosen {
> > > > + };
> > > > +
> > > > + cpus {
> > > > + #address-cells = <1>;
> > > > + #size-cells = <0>;
> > > > +
> > > > + cpu@0 {
> > > > + clock-frequency = <0>;
> > > > + compatible = "sifive,e51", "sifive,rocket0", "riscv";
> > > > + device_type = "cpu";
> > > > + i-cache-block-size = <64>;
> > > > + i-cache-sets = <128>;
> > > > + i-cache-size = <16384>;
> > > > + reg = <0>;
> > > > + riscv,isa = "rv64imac";
> > > > + status = "disabled";
> > > > +
> > > > + cpu0_intc: interrupt-controller {
> > > > + #interrupt-cells = <1>;
> > > > + compatible = "riscv,cpu-intc";
> > > > + interrupt-controller;
> > > > + };
> > > > + };
> > > > +
> > > > + cpu@1 {
> > > > + clock-frequency = <0>;
> > > > + compatible = "sifive,u54-mc", "sifive,rocket0", "riscv";
> > > > + d-cache-block-size = <64>;
> > > > + d-cache-sets = <64>;
> > > > + d-cache-size = <32768>;
> > > > + d-tlb-sets = <1>;
> > > > + d-tlb-size = <32>;
> > > > + device_type = "cpu";
> > > > + i-cache-block-size = <64>;
> > > > + i-cache-sets = <64>;
> > > > + i-cache-size = <32768>;
> > > > + i-tlb-sets = <1>;
> > > > + i-tlb-size = <32>;
> > > > + mmu-type = "riscv,sv39";
> > > > + reg = <1>;
> > > > + riscv,isa = "rv64imafdc";
> > > > + tlb-split;
> > > > + status = "okay";
> > > > +
> > > > + cpu1_intc: interrupt-controller {
> > > > + #interrupt-cells = <1>;
> > > > + compatible = "riscv,cpu-intc";
> > > > + interrupt-controller;
> > > > + };
> > > > + };
> > > > +
> > > > + cpu@2 {
> > > > + clock-frequency = <0>;
> > > > + compatible = "sifive,u54-mc", "sifive,rocket0", "riscv";
> > > > + d-cache-block-size = <64>;
> > > > + d-cache-sets = <64>;
> > > > + d-cache-size = <32768>;
> > > > + d-tlb-sets = <1>;
> > > > + d-tlb-size = <32>;
> > > > + device_type = "cpu";
> > > > + i-cache-block-size = <64>;
> > > > + i-cache-sets = <64>;
> > > > + i-cache-size = <32768>;
> > > > + i-tlb-sets = <1>;
> > > > + i-tlb-size = <32>;
> > > > + mmu-type = "riscv,sv39";
> > > > + reg = <2>;
> > > > + riscv,isa = "rv64imafdc";
> > > > + tlb-split;
> > > > + status = "okay";
> > > > +
> > > > + cpu2_intc: interrupt-controller {
> > > > + #interrupt-cells = <1>;
> > > > + compatible = "riscv,cpu-intc";
> > > > + interrupt-controller;
> > > > + };
> > > > + };
> > > > +
> > > > + cpu@3 {
> > > > + clock-frequency = <0>;
> > > > + compatible = "sifive,u54-mc", "sifive,rocket0", "riscv";
> > > > + d-cache-block-size = <64>;
> > > > + d-cache-sets = <64>;
> > > > + d-cache-size = <32768>;
> > > > + d-tlb-sets = <1>;
> > > > + d-tlb-size = <32>;
> > > > + device_type = "cpu";
> > > > + i-cache-block-size = <64>;
> > > > + i-cache-sets = <64>;
> > > > + i-cache-size = <32768>;
> > > > + i-tlb-sets = <1>;
> > > > + i-tlb-size = <32>;
> > > > + mmu-type = "riscv,sv39";
> > > > + reg = <3>;
> > > > + riscv,isa = "rv64imafdc";
> > > > + tlb-split;
> > > > + status = "okay";
> > > > +
> > > > + cpu3_intc: interrupt-controller {
> > > > + #interrupt-cells = <1>;
> > > > + compatible = "riscv,cpu-intc";
> > > > + interrupt-controller;
> > > > + };
> > > > + };
> > > > +
> > > > + cpu@4 {
> > > > + clock-frequency = <0>;
> > > > + compatible = "sifive,u54-mc", "sifive,rocket0", "riscv";
> > > > + d-cache-block-size = <64>;
> > > > + d-cache-sets = <64>;
> > > > + d-cache-size = <32768>;
> > > > + d-tlb-sets = <1>;
> > > > + d-tlb-size = <32>;
> > > > + device_type = "cpu";
> > > > + i-cache-block-size = <64>;
> > > > + i-cache-sets = <64>;
> > > > + i-cache-size = <32768>;
> > > > + i-tlb-sets = <1>;
> > > > + i-tlb-size = <32>;
> > > > + mmu-type = "riscv,sv39";
> > > > + reg = <4>;
> > > > + riscv,isa = "rv64imafdc";
> > > > + tlb-split;
> > > > + status = "okay";
> > > > + cpu4_intc: interrupt-controller {
> > > > + #interrupt-cells = <1>;
> > > > + compatible = "riscv,cpu-intc";
> > > > + interrupt-controller;
> > > > + };
> > > > + };
> > > > + };
> > > > +
> > > > + soc {
> > > > + #address-cells = <2>;
> > > > + #size-cells = <2>;
> > > > + compatible = "simple-bus";
> > > > + ranges;
> > > > +
> > > > + cache-controller@2010000 {
> > > > + compatible = "sifive,fu540-c000-ccache", "cache";
> > > > + cache-block-size = <64>;
> > > > + cache-level = <2>;
> > > > + cache-sets = <1024>;
> > > > + cache-size = <2097152>;
> > > > + cache-unified;
> > > > + interrupt-parent = <&plic>;
> > > > + interrupts = <1 2 3>;
> > > > + reg = <0x0 0x2010000 0x0 0x1000>;
> > > > + };
> > > > +
> > > > + clint@2000000 {
> > > > + compatible = "sifive,clint0";
> > > > + reg = <0x0 0x2000000 0x0 0xC000>;
> > > > + interrupts-extended = <&cpu0_intc 3 &cpu0_intc 7
> > > > + &cpu1_intc 3 &cpu1_intc 7
> > > > + &cpu2_intc 3 &cpu2_intc 7
> > > > + &cpu3_intc 3 &cpu3_intc 7
> > > > + &cpu4_intc 3 &cpu4_intc 7>;
> > > > + };
> > > > +
> > > > + plic: interrupt-controller@c000000 {
> > > > + #interrupt-cells = <1>;
> > > > + compatible = "sifive,plic-1.0.0";
> > > > + reg = <0x0 0xc000000 0x0 0x4000000>;
> > > > + riscv,ndev = <186>;
> > > > + interrupt-controller;
> > > > + interrupts-extended = <&cpu0_intc 11
> > > > + &cpu1_intc 11 &cpu1_intc 9
> > > > + &cpu2_intc 11 &cpu2_intc 9
> > > > + &cpu3_intc 11 &cpu3_intc 9
> > > > + &cpu4_intc 11 &cpu4_intc 9>;
> > > > + };
> > > > +
> > > > + dma@3000000 {
> > > > + compatible = "sifive,fu540-c000-pdma";
> > > > + reg = <0x0 0x3000000 0x0 0x8000>;
> > > > + interrupt-parent = <&plic>;
> > > > + interrupts = <23 24 25 26 27 28 29 30>;
> > > > + #dma-cells = <1>;
> > > > + };
> > > > +
> > > > + refclk: refclk {
> > > > + compatible = "fixed-clock";
> > > > + #clock-cells = <0>;
> > > > + clock-frequency = <600000000>;
> > > > + clock-output-names = "msspllclk";
> > > > + };
> > > > +
> > > > + clkcfg: clkcfg@20002000 {
> > > > + compatible = "microchip,mpfs-clkcfg";
> > > > + reg = <0x0 0x20002000 0x0 0x1000>;
> > > > + reg-names = "mss_sysreg";
> > > > + clocks = <&refclk>;
> > > > + #clock-cells = <1>;
> > > > + clock-output-names = "cpu", "axi", "ahb", "envm", /* 0-3 */
> > > > + "mac0", "mac1", "mmc", "timer", /* 4-7 */
> > > > + "mmuart0", "mmuart1", "mmuart2", "mmuart3", /* 8-11 */
> > > > + "mmuart4", "spi0", "spi1", "i2c0", /* 12-15 */
> > > > + "i2c1", "can0", "can1", "usb", /* 16-19 */
> > > > + "rsvd", "rtc", "qspi", "gpio0", /* 20-23 */
> > > > + "gpio1", "gpio2", "ddrc", "fic0", /* 24-27 */
> > > > + "fic1", "fic2", "fic3", "athena", "cfm"; /* 28-32 */
> > > > + };
> > > > +
> > > > + serial0: serial@20000000 {
> > > > + compatible = "ns16550a";
> > > > + reg = <0x0 0x20000000 0x0 0x400>;
> > > > + reg-io-width = <4>;
> > > > + reg-shift = <2>;
> > > > + interrupt-parent = <&plic>;
> > > > + interrupts = <90>;
> > > > + current-speed = <115200>;
> > > > + clocks = <&clkcfg 8>;
> > > > + status = "disabled";
> > > > + };
> > > > +
> > > > + serial1: serial@20100000 {
> > > > + compatible = "ns16550a";
> > > > + reg = <0x0 0x20100000 0x0 0x400>;
> > > > + reg-io-width = <4>;
> > > > + reg-shift = <2>;
> > > > + interrupt-parent = <&plic>;
> > > > + interrupts = <91>;
> > > > + current-speed = <115200>;
> > > > + clocks = <&clkcfg 9>;
> > > > + status = "disabled";
> > > > + };
> > > > +
> > > > + serial2: serial@20102000 {
> > > > + compatible = "ns16550a";
> > > > + reg = <0x0 0x20102000 0x0 0x400>;
> > > > + reg-io-width = <4>;
> > > > + reg-shift = <2>;
> > > > + interrupt-parent = <&plic>;
> > > > + interrupts = <92>;
> > > > + current-speed = <115200>;
> > > > + clocks = <&clkcfg 10>;
> > > > + status = "disabled";
> > > > + };
> > > > +
> > > > + serial3: serial@20104000 {
> > > > + compatible = "ns16550a";
> > > > + reg = <0x0 0x20104000 0x0 0x400>;
> > > > + reg-io-width = <4>;
> > > > + reg-shift = <2>;
> > > > + interrupt-parent = <&plic>;
> > > > + interrupts = <93>;
> > > > + current-speed = <115200>;
> > > > + clocks = <&clkcfg 11>;
> > > > + status = "disabled";
> > > > + };
> > > > +
> > > > + emmc: mmc@20008000 {
> > > > + compatible = "cdns,sd4hc";
> > > > + reg = <0x0 0x20008000 0x0 0x1000>;
> > > > + interrupt-parent = <&plic>;
> > > > + interrupts = <88 89>;
> > > > + pinctrl-names = "default";
> > > > + clocks = <&clkcfg 6>;
> > > > + bus-width = <4>;
> > > > + cap-mmc-highspeed;
> > > > + mmc-ddr-3_3v;
> > > > + max-frequency = <200000000>;
> > > > + non-removable;
> > > > + no-sd;
> > > > + no-sdio;
> > > > + voltage-ranges = <3300 3300>;
> > > > + status = "disabled";
> > > > + };
> > > > +
> > > > + sdcard: sdhc@20008000 {
> > > > + compatible = "cdns,sd4hc";
> > > > + reg = <0x0 0x20008000 0x0 0x1000>;
> > > > + interrupt-parent = <&plic>;
> > > > + interrupts = <88>;
> > > > + pinctrl-names = "default";
> > > > + clocks = <&clkcfg 6>;
> > > > + bus-width = <4>;
> > > > + disable-wp;
> > > > + cap-sd-highspeed;
> > > > + card-detect-delay = <200>;
> > > > + sd-uhs-sdr12;
> > > > + sd-uhs-sdr25;
> > > > + sd-uhs-sdr50;
> > > > + sd-uhs-sdr104;
> > > > + max-frequency = <200000000>;
> > > > + status = "disabled";
> > > > + };
> > > > +
> > > > + emac0: ethernet@20110000 {
> > > > + compatible = "cdns,macb";
> > > > + reg = <0x0 0x20110000 0x0 0x2000>;
> > > > + interrupt-parent = <&plic>;
> > > > + interrupts = <64 65 66 67>;
> > > > + local-mac-address = [00 00 00 00 00 00];
> > > > + clocks = <&clkcfg 4>, <&clkcfg 2>;
> > > > + clock-names = "pclk", "hclk";
> > > > + status = "disabled";
> > > > + #address-cells = <1>;
> > > > + #size-cells = <0>;
> > > > + };
> > > > +
> > > > + emac1: ethernet@20112000 {
> > > > + compatible = "cdns,macb";
> > > > + reg = <0x0 0x20112000 0x0 0x2000>;
> > > > + interrupt-parent = <&plic>;
> > > > + interrupts = <70 71 72 73>;
> > > > + mac-address = [00 00 00 00 00 00];
> > > > + clocks = <&clkcfg 5>, <&clkcfg 2>;
> > > > + status = "disabled";
> > > > + clock-names = "pclk", "hclk";
> > > > + #address-cells = <1>;
> > > > + #size-cells = <0>;
> > > > + };
> > > > +
> > > > + };
> > > > +};
> > > >
> > >
> > > _______________________________________________
> > > linux-riscv mailing list
> > > linux-riscv@xxxxxxxxxxxxxxxxxxx
> > > http://lists.infradead.org/mailman/listinfo/linux-riscv
> >
> > _______________________________________________
> > linux-riscv mailing list
> > linux-riscv@xxxxxxxxxxxxxxxxxxx
> > http://lists.infradead.org/mailman/listinfo/linux-riscv
>
>
>
> --
> Regards,
> Atish

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In reply to: Atish Patra: "Re: [PATCH v4 3/5] RISC-V: Initial DTS for Microchip ICICLE board"
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