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Subject: Re: [RFT PATCH v3 24/27] tty: serial: samsung_tty: Add 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
References: <20210304213902.83903-1-marcan@marcan.st>
 <20210304213902.83903-25-marcan@marcan.st>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Message-ID: <3ed6840e-1c12-4145-c2d5-cb05cac156e9@canonical.com>
Date:   Fri, 5 Mar 2021 11:58:50 +0100
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On 04/03/2021 22:38, Hector Martin wrote:
> Apple SoCs are a distant descendant of Samsung designs and use yet
> another variant of their UART style, with different interrupt handling.
> 
> In particular, this variant has the following differences with existing
> ones:
> 
> * It includes a built-in interrupt controller with different registers,
>   using only a single platform IRQ
> 
> * Internal interrupt sources are treated as edge-triggered, even though
>   the IRQ output is level-triggered. This chiefly affects the TX IRQ
>   path: the driver can no longer rely on the TX buffer empty IRQ
>   immediately firing after TX is enabled, but instead must prime the
>   FIFO with data directly.
> 
> Signed-off-by: Hector Martin <marcan@marcan.st>
> ---
>  drivers/tty/serial/Kconfig       |   2 +-
>  drivers/tty/serial/samsung_tty.c | 238 +++++++++++++++++++++++++++++--
>  include/linux/serial_s3c.h       |  16 +++
>  3 files changed, 247 insertions(+), 9 deletions(-)
> 

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

Best regards,
Krzysztof