linux-kernel - Re: [PATCH v9 03/13] ARM: Add basic support for Airoha EN7523 SoC

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Message-ID: <04c91b4e-e7c8-ac6a-f60a-0453a49122fa@nbd.name>
Date:   Mon, 31 Jan 2022 13:57:13 +0100
From:   Felix Fietkau <nbd@....name>
To:     Luka Perkov <luka.perkov@...tura.hr>
Cc:     Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        soc@...nel.org, Rob Herring <robh+dt@...nel.org>,
        linux-mediatek@...ts.infradead.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        John Crispin <john@...ozen.org>, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, Robert Marko <robert.marko@...tura.hr>
Subject: Re: [PATCH v9 03/13] ARM: Add basic support for Airoha EN7523 SoC


On 31.01.22 11:51, Luka Perkov wrote:
> Hello Felix,
> 
> On Sun, Jan 30, 2022 at 3:56 PM Felix Fietkau <nbd@....name> wrote:
>>
>> From: John Crispin <john@...ozen.org>
>>
>> EN7523 is an armv8 based silicon used inside broadband access type devices
>> such as xPON and xDSL. It shares various silicon blocks with MediaTek
>> silicon such as the MT7622.
>>
>> Add basic support for Airoha EN7523, enough for booting to console.
>>
>> The UART is basically 8250-compatible, except for the clock selection.
>> A clock-frequency value is synthesized to get this to run at 115200 bps.
>>
>> Signed-off-by: John Crispin <john@...ozen.org>
>> Signed-off-by: Bert Vermeulen <bert@...t.com>
>> Signed-off-by: Felix Fietkau <nbd@....name>
>> ---
>> index 000000000000..ea23b5abb478
>> --- /dev/null
>> +++ b/arch/arm/mach-airoha/airoha.c
>> @@ -0,0 +1,16 @@
>> +// SPDX-License-Identifier: GPL-2.0-or-later
>> +/*
>> + * Device Tree support for Airoha SoCs
>> + *
>> + * Copyright (c) 2022 Felix Fietkau <nbd@....name>
>> + */
>> +#include <asm/mach/arch.h>
>> +
>> +static const char * const airoha_board_dt_compat[] = {
>> +       "airoha,en7523",
>> +       NULL,
>> +};
>> +
>> +DT_MACHINE_START(MEDIATEK_DT, "Airoha Cortex-A53 (Device Tree)")
> 
> Since this is Cortex-A53 core is there a reason why this is not placed
> within arm64 directory?
 From what I can tell, it's a stripped-down core that only runs in 
32-bit mode.

- Felix