linux-kernel - Re: [PATCH v2] ARM: at91: debug: add lan966 support

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Message-ID: <14e896d59fa48e51a777324d5813d17a@walle.cc>
Date:   Thu, 24 Mar 2022 14:38:51 +0100
From:   Michael Walle <michael@...le.cc>
To:     Kavyasree Kotagiri <kavyasree.kotagiri@...rochip.com>
Cc:     alexandre.belloni@...tlin.com, linux@...linux.org.uk,
        linus.walleij@...aro.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, UNGLinuxDriver@...rochip.com,
        Manohar.Puri@...rochip.com
Subject: Re: [PATCH v2] ARM: at91: debug: add lan966 support

Hi Kavyasree,

Am 2022-03-24 14:10, schrieb Kavyasree Kotagiri:
> Add support for low-level debugging on FLEXCOM3 USART of
> LAN966 SoC.
> 
> Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@...rochip.com>
> ---
> v1 -> v2:
> - Corrected flexcom3 base address - 0xe0064200.

Unfortunately, you didn't respond to my previous remarks. Not
everyone has the debug console on FLEXCOM3. Therefore, I suggested
to use DEBUG_AT91_LAN966_FLEXCOM (please note the missing '3' at
the end) and add a table with all the offsets to the help text.

I'm fine with having the flexcom3 base address by default. But
that should also be noted in the help text.

-michael

>  arch/arm/Kconfig.debug | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
> index 0c9497d549e3..04501ddc7ab4 100644
> --- a/arch/arm/Kconfig.debug
> +++ b/arch/arm/Kconfig.debug
> @@ -210,6 +210,14 @@ choice
>  		  Say Y here if you want kernel low-level debugging support
>  		  on the FLEXCOM3 port of SAMA7G5.
> 
> +        config DEBUG_AT91_LAN966_FLEXCOM3
> +                bool "Kernel low-level debugging on LAN966 FLEXCOM3 
> USART"
> +                select DEBUG_AT91_UART
> +                depends on SOC_LAN966
> +                help
> +                  Say Y here if you want kernel low-level debugging 
> support
> +                  on the FLEXCOM3 port of LAN966.
> +
>  	config DEBUG_BCM2835
>  		bool "Kernel low-level debugging on BCM2835 PL011 UART"
>  		depends on ARCH_BCM2835 && ARCH_MULTI_V6
> @@ -1685,6 +1693,7 @@ config DEBUG_UART_PHYS
>  	default 0xd4017000 if DEBUG_MMP_UART2
>  	default 0xd4018000 if DEBUG_MMP_UART3
>  	default 0xe0000000 if DEBUG_SPEAR13XX
> +	default 0xe0064200 if DEBUG_AT91_LAN966_FLEXCOM3
>  	default 0xe1824200 if DEBUG_AT91_SAMA7G5_FLEXCOM3
>  	default 0xe4007000 if DEBUG_HIP04_UART
>  	default 0xe6c40000 if DEBUG_RMOBILE_SCIFA0
> @@ -1805,6 +1814,7 @@ config DEBUG_UART_VIRT
>  	default 0xfb10c000 if DEBUG_REALVIEW_PB1176_PORT
>  	default 0xfcfe8600 if DEBUG_BCM63XX_UART
>  	default 0xfd000000 if DEBUG_SPEAR3XX || DEBUG_SPEAR13XX
> +	default 0xfd064200 if DEBUG_AT91_LAN966_FLEXCOM3
>  	default 0xfd531000 if DEBUG_STIH41X_SBC_ASC1
>  	default 0xfd883000 if DEBUG_ALPINE_UART0
>  	default 0xfdd32000 if DEBUG_STIH41X_ASC2