linux-kernel - [PATCH] ARM: dts: meson: Set the fifo-size of uart

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Date:   Fri,  4 Jun 2021 19:08:44 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     linux-amlogic@...ts.infradead.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        jbrunet@...libre.com, khilman@...libre.com,
        narmstrong@...libre.com,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH] ARM: dts: meson: Set the fifo-size of uart_A to 128 bytes

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@...glemail.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@...0 {
 				compatible = "amlogic,meson6-uart", "amlogic,meson-uart";
 				reg = <0x84c0 0x18>;
 				interrupts = <GIC_SPI 26 IRQ_TYPE_EDGE_RISING>;
+				fifo-size = <128>;
 				status = "disabled";
 			};
 
-- 
2.31.1