linux-kernel - Re: [RFT PATCH v3 24/27] tty: serial: samsung

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Message-ID: <3ed6840e-1c12-4145-c2d5-cb05cac156e9@canonical.com>
Date:   Fri, 5 Mar 2021 11:58:50 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Hector Martin <marcan@...can.st>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Marc Zyngier <maz@...nel.org>, Rob Herring <robh@...nel.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Olof Johansson <olof@...om.net>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Tony Lindgren <tony@...mide.com>,
        Mohamed Mediouni <mohamed.mediouni@...amail.com>,
        Stan Skowronek <stan@...ellium.com>,
        Alexander Graf <graf@...zon.com>,
        Will Deacon <will@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@...radead.org>,
        "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFT PATCH v3 24/27] tty: serial: samsung_tty: Add support for
 Apple UARTs

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@...can.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@...onical.com>
Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>

Best regards,
Krzysztof