Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [RFT PATCH v3 25/27] tty: serial: samsung_tty: Add earlycon
 support for Apple UARTs
To:     Hector Martin <marcan@marcan.st>,
        linux-arm-kernel@lists.infradead.org
Cc:     Marc Zyngier <maz@kernel.org>, Rob Herring <robh@kernel.org>,
        Arnd Bergmann <arnd@kernel.org>,
        Olof Johansson <olof@lixom.net>,
        Mark Kettenis <mark.kettenis@xs4all.nl>,
        Tony Lindgren <tony@atomide.com>,
        Mohamed Mediouni <mohamed.mediouni@caramail.com>,
        Stan Skowronek <stan@corellium.com>,
        Alexander Graf <graf@amazon.com>,
        Will Deacon <will@kernel.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Christoph Hellwig <hch@infradead.org>,
        "David S. Miller" <davem@davemloft.net>,
        devicetree@vger.kernel.org, linux-serial@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
        linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
        Arnd Bergmann <arnd@arndb.de>
References: <20210304213902.83903-1-marcan@marcan.st>
 <20210304213902.83903-26-marcan@marcan.st>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Message-ID: <d315bcd3-db89-a100-5e4f-a4c51a48aed5@canonical.com>
Date:   Fri, 5 Mar 2021 11:55:53 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101
 Thunderbird/78.7.1
MIME-Version: 1.0
In-Reply-To: <20210304213902.83903-26-marcan@marcan.st>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 04/03/2021 22:39, Hector Martin wrote:
> Earlycon support is identical to S3C2410, but Apple SoCs also need
> MMIO mapped as nGnRnE. This is handled generically for normal drivers
> including the normal UART path here, but earlycon uses fixmap and
> runs before that scaffolding is ready.
> 
> Since this is the only case where we need this fix, it makes more
> sense to do it here in the UART driver instead of introducing a
> whole fdt nonposted-mmio resolver just for earlycon/fixmap.
> 
> Suggested-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Hector Martin <marcan@marcan.st>
> ---
>  drivers/tty/serial/samsung_tty.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

Best regards,
Krzysztof