Re: [RFC PATCH 2/3] RISC-V: Initial DTS for Microchip ICICLE board

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On Thu, Oct 29, 2020 at 6:42 PM Ben Dooks <ben.dooks@xxxxxxxxxxxxxxx> wrote:
>
> On 28/10/2020 23:27, Atish Patra wrote:
> > Add initial DTS for Microchip ICICLE board having only
> > essential devcies (clocks, sdhci, ethernet, serial, etc).
> >
> > Signed-off-by: Atish Patra <atish.patra@xxxxxxx>
> > ---
> >   arch/riscv/boot/dts/Makefile                  |   1 +
> >   arch/riscv/boot/dts/microchip/Makefile        |   2 +
> >   .../microchip/microchip-icicle-kit-a000.dts   | 313 ++++++++++++++++++
> >   3 files changed, 316 insertions(+)
> >   create mode 100644 arch/riscv/boot/dts/microchip/Makefile
> >   create mode 100644 arch/riscv/boot/dts/microchip/microchip-icicle-kit-a000.dts
> >
> > diff --git a/arch/riscv/boot/dts/Makefile b/arch/riscv/boot/dts/Makefile
> > index ca1f8cbd78c0..3ea94ea0a18a 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-y += kendryte
> > +subdir-y += microchip
> >
> >   obj-$(CONFIG_BUILTIN_DTB) := $(addsuffix /, $(subdir-y))
> > diff --git a/arch/riscv/boot/dts/microchip/Makefile b/arch/riscv/boot/dts/microchip/Makefile
> > new file mode 100644
> > index 000000000000..55ad77521304
> > --- /dev/null
> > +++ b/arch/riscv/boot/dts/microchip/Makefile
> > @@ -0,0 +1,2 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +dtb-$(CONFIG_SOC_MICROCHIP_POLARFIRE) += microchip-icicle-kit-a000.dtb
> > diff --git a/arch/riscv/boot/dts/microchip/microchip-icicle-kit-a000.dts b/arch/riscv/boot/dts/microchip/microchip-icicle-kit-a000.dts
> > new file mode 100644
> > index 000000000000..5848920af55c
> > --- /dev/null
> > +++ b/arch/riscv/boot/dts/microchip/microchip-icicle-kit-a000.dts
> > @@ -0,0 +1,313 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/* Copyright (c) 2020 Microchip Technology Inc */
> > +
> > +/dts-v1/;
> > +
> > +/* Clock frequency (in Hz) of the rtcclk */
> > +#define RTCCLK_FREQ          1000000
> > +
> > +/ {
> > +     #address-cells = <2>;
> > +     #size-cells = <2>;
> > +     model = "Microchip PolarFire-SoC";
> > +     compatible = "microchip,polarfire-soc";
> > +
> > +     chosen {
> > +             stdout-path = &serial0;
> > +     };
> > +
> > +     cpus {
> > +             #address-cells = <1>;
> > +             #size-cells = <0>;
> > +             timebase-frequency = <RTCCLK_FREQ>;
> > +
> > +             cpu@0 {
> > +                     clock-frequency = <0>;
> > +                     compatible = "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,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,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,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,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;
> > +                     };
> > +             };
> > +     };
> > +
> > +     memory@80000000 {
> > +             device_type = "memory";
> > +             reg = <0x0 0x80000000 0x0 0x40000000>;
> > +             clocks = <&clkcfg 26>;
> > +     };
>
> U-boot doesn't seem to be updating this properly.
>
> The board should have 2GiB, confirmed by looking at the device's
> chip markings. We only see 1GiB memory. The 0x80000000 bus window
> is only capable of dealing with 1GiB memory. The higher 64-bit one
> can have 16GiB mapped.
>
> Do we need a second node for the second GiB of memory?
>
> > +
> > +     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 = "riscv,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 = <53>;
> > +                     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,pfsoc-clkcfg";
> > +                     reg = <0x0 0x20002000 0x0 0x1000>;
> > +                     reg-names = "mss_sysreg";
> > +                     clocks = <&refclk>;
> > +                     #clock-cells = <1>;
> > +                     clock-output-names = "cpuclk", "axiclk", "ahbclk", "ENVMclk", "MAC0clk", "MAC1clk", "MMCclk", "TIMERclk", "MMUART0clk", "MMUART1clk", "MMUART2clk", "MMUART3clk", "MMUART4clk", "SPI0clk", "SPI1clk", "I2C0clk", "I2C1clk", "CAN0clk", "CAN1clk", "USBclk", "RESERVED", "RTCclk", "QSPIclk", "GPIO0clk", "GPIO1clk", "GPIO2clk", "DDRCclk", "FIC0clk", "FIC1clk", "FIC2clk", "FIC3clk", "ATHENAclk", "CFMclk";
>
> Any chance of making this list multi-line, it is difficult to read as-is.

Besides the multi-line issue, I believe the clock-output-names should
all have lower case names.

>
> > +             };
> > +
> > +             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 = "okay";
> > +             };
> > +
> > +             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 = "okay";
> > +             };
> > +
> > +             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 = "okay";
> > +             };
> > +
> > +             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 = "okay";
> > +             };
> > +
> > +             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;
> > +                     no-1-8-v;
> > +                     cap-mmc-highspeed;
> > +                     cap-sd-highspeed;
> > +                     card-detect-delay = <200>;
> > +                     sd-uhs-sdr12;
> > +                     sd-uhs-sdr25;
> > +                     sd-uhs-sdr50;
> > +                     sd-uhs-sdr104;
> > +                     max-frequency = <200000000>;
> > +                     status = "okay";
> > +             };
>
> Given eMMC is the default device, shouldn't that be default for the
> device tree too? Even if not, having the emmc node here would be a
> good thing as it is different to the SD node.
>
> > +
> > +             emac1: ethernet@20112000 {
> > +                     compatible = "cdns,macb";
> > +                     reg = <0x0 0x20112000 0x0 0x2000>;
> > +                     interrupt-parent = <&plic>;
> > +                     interrupts = <70 71 72 73>;
> > +                     mac-address = [56 34 12 00 FC 00];
> > +                     phy-mode = "sgmii";
> > +                     clocks = <&clkcfg 5>, <&clkcfg 2>;
> > +                     clock-names = "pclk", "hclk";
> > +                     #address-cells = <1>;
> > +                     #size-cells = <0>;
> > +                     phy1: ethernet-phy@9 {
> > +                             reg = <9>;
> > +                             ti,fifo-depth = <0x01>;
> > +                     };
> > +             };
>
> Aren't there two ethernet ports on the board?
>
> Also, at the moment u-boot is not filling the MAC address parameter
> in so we've got at two boards on the network with the same MAC until
> we override it in the device tree for the second.
>
> > +
> > +             uio_axi_lsram@2030000000 {
> > +                     compatible = "generic-uio";
> > +                     reg = <0x20 0x30000000 0 0x80000000 >;
> > +                     status = "okay";
> > +             };
> > +     };
> > +};

Regards,
Bin




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