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: [PATCH] ARM: dts: meson: Set the fifo-size of uart_A to 128 bytes
To:     Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        linux-amlogic@lists.infradead.org
Cc:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        jbrunet@baylibre.com, khilman@baylibre.com
References: <20210604170844.2201229-1-martin.blumenstingl@googlemail.com>
From:   Neil Armstrong <narmstrong@baylibre.com>
Organization: Baylibre
Message-ID: <0e3b8d5b-756b-fefe-fbd3-8a786d7344ac@baylibre.com>
Date:   Mon, 14 Jun 2021 09:56:01 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101
 Thunderbird/78.8.1
MIME-Version: 1.0
In-Reply-To: <20210604170844.2201229-1-martin.blumenstingl@googlemail.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 04/06/2021 19:08, Martin Blumenstingl wrote:
> The first UART controller in the "Everything-Else" power domain is
> called uart_A. Unlike all other UARTs (which use a 64 byte fifo-size in
> hardware) uart_A has a fifo-size of 128 bytes. This UART controller is
> typically used for Bluetooth HCI.
> The fifo-size of 128 bytes is valid from all SoCs from Meson6 (or
> possibly even earlier) all the way up to the latest 64-bit ones.
> 
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> ---
>  arch/arm/boot/dts/meson.dtsi | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm/boot/dts/meson.dtsi b/arch/arm/boot/dts/meson.dtsi
> index 8bae6ed0abb2..bd0e864964e9 100644
> --- a/arch/arm/boot/dts/meson.dtsi
> +++ b/arch/arm/boot/dts/meson.dtsi
> @@ -50,6 +50,7 @@ uart_A: serial@84c0 {
>  				compatible = "amlogic,meson6-uart", "amlogic,meson-uart";
>  				reg = <0x84c0 0x18>;
>  				interrupts = <GIC_SPI 26 IRQ_TYPE_EDGE_RISING>;
> +				fifo-size = <128>;
>  				status = "disabled";
>  			};
>  
> 

Acked-by: Neil Armstrong <narmstrong@baylibre.com>