[PATCH v3 1/6] at91: kernel: bump to 5.10

[Claudiu.Beznea at microchip.com]

On 09.09.2021 22:52, Hauke Mehrtens wrote:
>> Bump at91 targets to kernel v5.10. With this patches and files for
>> wb45n and wb50n were removed as they are now included in upstream
>> kernel. Along with this:
>> - the kernel config for sam9x targets has been refreshed (with
>>    make kernel_menuconfig + save);
>> - CONFIG_ARCH_AT91 and specific sam9x SoCs (AT91RM9200, AT91SAM9,
>>    SAM9X60) has been enabled such that sam9x SoCs to be able to boot.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea at microchip.com>
>> ---
>>   target/linux/at91/Makefile                    |   2 +-
>>   .../at91/files/arch/arm/boot/dts/wb45n.dts    | 220 ------------------
>>   .../at91/files/arch/arm/boot/dts/wb50n.dts    | 113 ---------
>>   .../at91/files/arch/arm/boot/dts/wb50n.dtsi   | 205 ----------------
>>   target/linux/at91/image/sam9x.mk              |   1 +
>>   target/linux/at91/image/sama5.mk              |   1 +
>>   .../101-ARM-at91-build-dtb-for-q5xr5.patch    |  10 +
>>   .../101-ARM-at91-build-dtb-for-q5xr5.patch    |  10 -
>>   .../102-ARM-at91-build-dtb-for-wb45n.patch    |  12 -
>>   ...2-ARM-at91-wb45n-fix-duplicate-label.patch |  20 --
>>   .../103-ARM-at91-build-dtb-for-wb50n.patch    |  12 -
>>   ...3-ARM-at91-wb50n-fix-duplicate-label.patch |  39 ----
>>   target/linux/at91/sam9x/config-default        | 105 ++++-----
>>   13 files changed, 57 insertions(+), 693 deletions(-)
>>   delete mode 100644 target/linux/at91/files/arch/arm/boot/dts/wb45n.dts
>>   delete mode 100644 target/linux/at91/files/arch/arm/boot/dts/wb50n.dts
>>   delete mode 100644 target/linux/at91/files/arch/arm/boot/dts/wb50n.dtsi
>>   create mode 040000 target/linux/at91/patches-5.10
>>   create mode 100644
>> target/linux/at91/patches-5.10/101-ARM-at91-build-dtb-for-q5xr5.patch
>>   delete mode 040000 target/linux/at91/patches-5.4
>>   delete mode 100644
>> target/linux/at91/patches-5.4/101-ARM-at91-build-dtb-for-q5xr5.patch
>>   delete mode 100644
>> target/linux/at91/patches-5.4/102-ARM-at91-build-dtb-for-wb45n.patch
>>   delete mode 100644
>> target/linux/at91/patches-5.4/102-ARM-at91-wb45n-fix-duplicate-label.patch
>>   delete mode 100644
>> target/linux/at91/patches-5.4/103-ARM-at91-build-dtb-for-wb50n.patch
>>   delete mode 100644
>> target/linux/at91/patches-5.4/103-ARM-at91-wb50n-fix-duplicate-label.patch
>>
> ......
>> -CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
>> -CONFIG_HAVE_RSEQ=y
>> -CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
>> -CONFIG_HAVE_UID16=y
>> -CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
>> -CONFIG_HZ_FIXED=0
>> +CONFIG_HZ=128
>> +CONFIG_HZ_FIXED=128
> 
> CONFIG_HZ=100 is set in the generic configuration, do you really need 128?

It is the result of doing make kernel_menuconfig + save as arch/arm/Kconfig
from Linux kernel tree has these lines:

config HZ_FIXED

        int

        default 128 if SOC_AT91RM9200

        default 0


Since SOC_AT91RM9200 has been introduced in this commit (along with
SOC_AT91SAM9, SOC_SAM9X60) as the targets were not able to boot without
these config flags, the CONFIG_HZ_FIXED has been selected accordingly to 128.

The Linux commit that introduces this is:

commit 1164f672d71ac103d85207b0453f3127c0efefb3
Author: Alexandre Belloni <alexandre.belloni at bootlin.com>
Date:   Fri Mar 13 22:57:24 2015 +0100

    ARM: at91: drop AT91_TIMER_HZ

    Drop AT91_TIMER_HZ as this can be handled using HZ_FIXED. Initial help
message
    was:

    On AT91rm9200 chips where you're using a system clock derived
    from the 32768 Hz hardware clock, this tick rate should divide
    it exactly: use a power-of-two value, such as 128 or 256, to
    reduce timing errors caused by rounding.

    Signed-off-by: Alexandre Belloni <alexandre.belloni at free-electrons.com>
    Signed-off-by: Nicolas Ferre <nicolas.ferre at atmel.com>

>From commit description seems better to keep it at 128.

Thank you,
Claudiu Beznea