Message-Id: <1574944293.3.0@crapouillou.net>
Date:   Thu, 28 Nov 2019 13:31:33 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Zhou Yanjie <zhouyanjie@...o.com>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, robh+dt@...nel.org,
        paul.burton@...s.com, paulburton@...nel.org, jhogan@...nel.org,
        mripard@...nel.org, shawnguo@...nel.org, mark.rutland@....com,
        syq@...ian.org, ralf@...ux-mips.org, heiko@...ech.de,
        icenowy@...c.io, laurent.pinchart@...asonboard.com,
        krzk@...nel.org, geert+renesas@...der.be,
        prasannatsmkumar@...il.com, sernia.zhou@...mail.com,
        zhenwenjin@...il.com, 772753199@...com
Subject: Re: [PATCH v4 4/6] MIPS: Ingenic: Initial YSH & ATIL CU Neo board
 support.

Hi Zhou,


Le jeu., nov. 28, 2019 at 13:11, Zhou Yanjie <zhouyanjie@...o.com> a 
écrit :
> Hi Paul,
> 
> On 2019年11月28日 00:57, Paul Cercueil wrote:
>> Hi Zhou,
>> 
>> 
>> Le mer., nov. 27, 2019 at 01:06, Zhou Yanjie <zhouyanjie@...o.com> a 
>> écrit :
>>> Add a device tree for the Ingenic X1000 based YSH & ATIL CU Neo 
>>> board.
>>> Note that this is unselectable via Kconfig until the X1000 SoC is 
>>> made
>>> selectable in a later commit.
>>> 
>>> Signed-off-by: Zhou Yanjie <zhouyanjie@...o.com>
>>> ---
>>> 
>>> Notes:
>>>     v1->v2:
>>>     Rebase on top of mips-next, use TCU for system timer and 
>>> clocksource.
>>> 
>>>     v2->v3:
>>>     No change.
>>> 
>>>     v3->v4:
>>>     1.Adjust "model" in "cu1000.dts" to match the description in 
>>> "devices.yaml".
>>>     2.Adjust "bool" in "Kconfig" to avoid duplicate names with 
>>> subsequent boards.
>>> 
>>>  arch/mips/boot/dts/ingenic/Makefile   |   1 +
>>>  arch/mips/boot/dts/ingenic/cu1000.dts |  52 ++++++++++++++++++
>>>  arch/mips/configs/cu1000_defconfig    | 100 
>>> ++++++++++++++++++++++++++++++++++
>>>  arch/mips/jz4740/Kconfig              |   4 ++
>>>  4 files changed, 157 insertions(+)
>>>  create mode 100644 arch/mips/boot/dts/ingenic/cu1000.dts
>>>  create mode 100644 arch/mips/configs/cu1000_defconfig
>>> 
>>> diff --git a/arch/mips/boot/dts/ingenic/Makefile 
>>> b/arch/mips/boot/dts/ingenic/Makefile
>>> index 9cc4844..f6db7bb 100644
>>> --- a/arch/mips/boot/dts/ingenic/Makefile
>>> +++ b/arch/mips/boot/dts/ingenic/Makefile
>>> @@ -2,5 +2,6 @@
>>>  dtb-$(CONFIG_JZ4740_QI_LB60)    += qi_lb60.dtb
>>>  dtb-$(CONFIG_JZ4770_GCW0)    += gcw0.dtb
>>>  dtb-$(CONFIG_JZ4780_CI20)    += ci20.dtb
>>> +dtb-$(CONFIG_X1000_CU1000)    += cu1000.dtb
>>> 
>>>  obj-$(CONFIG_BUILTIN_DTB)    += $(addsuffix .o, $(dtb-y))
>>> diff --git a/arch/mips/boot/dts/ingenic/cu1000.dts 
>>> b/arch/mips/boot/dts/ingenic/cu1000.dts
>>> new file mode 100644
>>> index 00000000..f92f6af
>>> --- /dev/null
>>> +++ b/arch/mips/boot/dts/ingenic/cu1000.dts
>>> @@ -0,0 +1,52 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +/dts-v1/;
>>> +
>>> +#include "x1000.dtsi"
>>> +#include <dt-bindings/gpio/gpio.h>
>>> +#include <dt-bindings/clock/ingenic,tcu.h>
>>> +
>>> +/ {
>>> +    compatible = "yna,cu1000", "ingenic,x1000";
>>> +    model = "YSH & ATIL General Board CU Neo";
>>> +
>>> +    aliases {
>>> +        serial2 = &uart2;
>>> +    };
>>> +
>>> +    chosen {
>>> +        stdout-path = &uart2;
>>> +    };
>>> +
>>> +    memory {
>>> +        device_type = "memory";
>>> +        reg = <0x0 0x04000000>;
>>> +    };
>>> +};
>>> +
>>> +&exclk {
>>> +    clock-frequency = <24000000>;
>>> +};
>>> +
>>> +&tcu {
>>> +    /* 1500 kHz for the system timer and clocksource */
>>> +    assigned-clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER2>;
>>> +    assigned-clock-rates = <1500000>, <1500000>;
>>> +
>>> +    /* Use channel #1 for the system timer channel #2 for the 
>>> clocksource */
>>> +    ingenic,pwm-channels-mask = <0xfa>;
>> 
>> From the mask used, I'm gessing that you're reserving channels #0 
>> and #2, not #1 and #2.
>> 
> 
> My fault, you are right, it use channels #0 and #2.
> 
>>> +};
>>> +
>>> +&uart2 {
>>> +    status = "okay";
>>> +
>>> +    pinctrl-names = "default";
>>> +    pinctrl-0 = <&pins_uart2>;
>>> +};
>>> +
>>> +&pinctrl {
>>> +    pins_uart2: uart2 {
>>> +        function = "uart2";
>>> +        groups = "uart2-data-d";
>>> +        bias-disable;
>>> +    };
>>> +};
>>> diff --git a/arch/mips/configs/cu1000_defconfig 
>>> b/arch/mips/configs/cu1000_defconfig
>>> new file mode 100644
>>> index 00000000..88729ee
>>> --- /dev/null
>>> +++ b/arch/mips/configs/cu1000_defconfig
>>> @@ -0,0 +1,100 @@
>>> +CONFIG_LOCALVERSION_AUTO=y
>>> +CONFIG_KERNEL_GZIP=y
>>> +CONFIG_SYSVIPC=y
>>> +CONFIG_NO_HZ_IDLE=y
>>> +CONFIG_HIGH_RES_TIMERS=y
>>> +CONFIG_PREEMPT=y
>>> +CONFIG_IKCONFIG=y
>>> +CONFIG_IKCONFIG_PROC=y
>>> +CONFIG_LOG_BUF_SHIFT=14
>>> +CONFIG_CGROUPS=y
>>> +CONFIG_MEMCG=y
>>> +CONFIG_MEMCG_KMEM=y
>>> +CONFIG_CGROUP_SCHED=y
>>> +CONFIG_CGROUP_FREEZER=y
>>> +CONFIG_CGROUP_DEVICE=y
>>> +CONFIG_CGROUP_CPUACCT=y
>>> +CONFIG_NAMESPACES=y
>>> +CONFIG_USER_NS=y
>>> +CONFIG_BLK_DEV_INITRD=y
>>> +CONFIG_INITRAMFS_SOURCE="arch/mips/boot/ramdisk.cpio.gz"
>>> +CONFIG_CC_OPTIMIZE_FOR_SIZE=y
>>> +CONFIG_SYSCTL_SYSCALL=y
>>> +CONFIG_KALLSYMS_ALL=y
>>> +CONFIG_EMBEDDED=y
>>> +# CONFIG_VM_EVENT_COUNTERS is not set
>>> +# CONFIG_COMPAT_BRK is not set
>>> +CONFIG_SLAB=y
>>> +CONFIG_MACH_INGENIC=y
>>> +CONFIG_X1000_CU1000=y
>>> +CONFIG_HIGHMEM=y
>>> +CONFIG_HZ_100=y
>>> +CONFIG_HZ=100
>> 
>> This line looks malformed.
> 
> Ok, I'll remove it in v7.
> 
>> 
>>> +# CONFIG_SECCOMP is not set
>>> +# CONFIG_SUSPEND is not set
>>> +# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
>>> +# CONFIG_COMPACTION is not set
>>> +CONFIG_CMA=y
>>> +CONFIG_CMA_AREAS=7
>>> +CONFIG_UEVENT_HELPER=y
>>> +CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
>>> +CONFIG_DEVTMPFS=y
>>> +# CONFIG_FW_LOADER is not set
>>> +# CONFIG_ALLOW_DEV_COREDUMP is not set
>>> +# CONFIG_INPUT_MOUSEDEV is not set
>>> +# CONFIG_INPUT_KEYBOARD is not set
>>> +# CONFIG_INPUT_MOUSE is not set
>>> +# CONFIG_SERIO is not set
>>> +CONFIG_VT_HW_CONSOLE_BINDING=y
>>> +CONFIG_LEGACY_PTY_COUNT=2
>>> +CONFIG_SERIAL_EARLYCON=y
>>> +CONFIG_SERIAL_8250=y
>>> +CONFIG_SERIAL_8250_CONSOLE=y
>>> +CONFIG_SERIAL_8250_NR_UARTS=3
>>> +CONFIG_SERIAL_8250_RUNTIME_UARTS=3
>>> +CONFIG_SERIAL_8250_INGENIC=y
>>> +CONFIG_SERIAL_OF_PLATFORM=y
>>> +# CONFIG_HW_RANDOM is not set
>>> +CONFIG_GPIO_SYSFS=y
>>> +# CONFIG_HWMON is not set
>>> +# CONFIG_LCD_CLASS_DEVICE is not set
>>> +# CONFIG_BACKLIGHT_CLASS_DEVICE is not set
>>> +# CONFIG_VGA_CONSOLE is not set
>>> +# CONFIG_HID is not set
>>> +# CONFIG_USB_SUPPORT is not set
>>> +# CONFIG_IOMMU_SUPPORT is not set
>>> +CONFIG_NVMEM=y
>>> +CONFIG_NVMEM_SYSFS=y
>>> +CONFIG_EXT4_FS=y
>>> +# CONFIG_DNOTIFY is not set
>>> +CONFIG_PROC_KCORE=y
>>> +# CONFIG_PROC_PAGE_MONITOR is not set
>>> +CONFIG_TMPFS=y
>>> +CONFIG_CONFIGFS_FS=y
>>> +CONFIG_NLS=y
>>> +CONFIG_NLS_CODEPAGE_936=y
>>> +CONFIG_NLS_CODEPAGE_950=y
>>> +CONFIG_NLS_ASCII=y
>>> +CONFIG_NLS_ISO8859_1=y
>>> +CONFIG_NLS_UTF8=y
>>> +CONFIG_CRYPTO_ECHAINIV=y
>>> +CONFIG_CRYPTO_AES=y
>>> +CONFIG_CRYPTO_DEFLATE=y
>>> +CONFIG_CRYPTO_LZO=y
>>> +CONFIG_PRINTK_TIME=y
>>> +CONFIG_CONSOLE_LOGLEVEL_DEFAULT=15
>>> +CONFIG_CONSOLE_LOGLEVEL_QUIET=15
>>> +CONFIG_MESSAGE_LOGLEVEL_DEFAULT=7
>>> +CONFIG_DEBUG_INFO=y
>>> +CONFIG_STRIP_ASM_SYMS=y
>>> +CONFIG_DEBUG_FS=y
>>> +CONFIG_MAGIC_SYSRQ=y
>>> +CONFIG_PANIC_ON_OOPS=y
>>> +CONFIG_PANIC_TIMEOUT=10
>>> +# CONFIG_SCHED_DEBUG is not set
>>> +# CONFIG_DEBUG_PREEMPT is not set
>>> +CONFIG_STACKTRACE=y
>>> +# CONFIG_FTRACE is not set
>>> +CONFIG_CMDLINE_BOOL=y
>>> +CONFIG_CMDLINE="console=ttyS2,115200n8 mem=32M@0x0 earlycon 
>>> clk_ignore_unused"
>> 
>> You already specify the stdout-path in the devicetree, no need to 
>> pass the "console" parameter.
>> 
> 
> According the test log , if remove "console=ttyS2,115200n8", serial 
> will not
> initialized and will stuck after:
> 
> [    0.016815] printk: bootconsole [x1000_uart0] disabled
> 
> if remove both "console=ttyS2,115200n8" and "earlycon" it will stuck 
> after:
> 
> Starting kernel ...
> 
> So I think both the "earlycon" and the "console=ttyS2,115200n8 
> earlycon" should be retained.

There must be something wrong with your kernel config. It works here.

Use this as your stdout-path: "serial2:115200n8", unset 
CONFIG_CMDLINE_OVERRIDE, enable MIPS_CMDLINE_DTB_EXTEND, and just use 
"earlycon clk_ignore_unused" in the devicetree's bootargs. That should 
do it.

> 
>> For the "mem" parameter, it's already set in the devicetree, so no 
>> need to set it again here.
>> Besides, in the devicetree it is set to 64 MiB.
> 
> Ok, I'll remove them in v7.
> 
>> 
>> Why is clk_ignore_unused needed?
> 
> In fact, I also don't know why "clk_ignore_unused" needed.
> This part of the parameter is copied from ci20_defconfig,
> but according to the test, if remove "clk_ignore_unused",
> it will stuck after :
> 
> [    0.374361] printk: bootconsole [x1000_uart0] disabled
> 
> Differeent from the case where "console=ttyS2,115200n8" is removed,
> the serial is successfully initialized this time.
> 
> So I think "clk_ignore_unused" should be retained.

It locks up because Linux disables a clock that is required for the 
system. This clock should be requested and enabled by a client driver. 
Could you investigate which clock is the problem?

@Paul Burton: do you remember why it was needed on CI20?

In the meantime I suppose "clk_ignore_unused" is fine.

Cheers,
-Paul

>> 
>>> +CONFIG_CMDLINE_OVERRIDE=y
>>> diff --git a/arch/mips/jz4740/Kconfig b/arch/mips/jz4740/Kconfig
>>> index 6b96844..ccaf507 100644
>>> --- a/arch/mips/jz4740/Kconfig
>>> +++ b/arch/mips/jz4740/Kconfig
>>> @@ -16,6 +16,10 @@ config JZ4780_CI20
>>>      bool "MIPS Creator CI20"
>>>      select MACH_JZ4780
>>> 
>>> +config X1000_CU1000
>>> +    bool "YSH & ATIL General Module CU1000"
>>> +    select MACH_X1000
>>> +
>>>  endchoice
>>> 
>>>  config MACH_JZ4740
>>> --
>>> 2.7.4
>>> 
>>> 
>> 
>> 
> 
> 
> 

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