linux-kernel - [PATCH v1] serial: pl011: Add ACPI SBSA UART match id

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Message-Id: <20211109172248.19061-1-Pierre.Gondois@arm.com>
Date:   Tue,  9 Nov 2021 17:22:48 +0000
From:   Pierre Gondois <Pierre.Gondois@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Thanu Rangarajan <Thanu.Rangarajan@....com>,
        Sami Mujawar <Sami.Mujawar@....com>,
        Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@....com>,
        Andre Przywara <andre.przywara@....com>,
        Rob Herring <rob.herring@....com>, stable@...r.kernel.org,
        Russell King <linux@...linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, linux-serial@...r.kernel.org
Subject: [PATCH v1] serial: pl011: Add ACPI SBSA UART match id

The document 'ACPI for Arm Components 1.0' defines the following
_HID mappings:
-'Prime cell UART (PL011)': ARMH0011
-'SBSA UART': ARMHB000

Use the sbsa-uart driver when a device is described with
the 'ARMHB000' _HID.

Note:
PL011 devices currently use the sbsa-uart driver instead of the
uart-pl011 driver. Indeed, PL011 devices are not bound to a clock
in ACPI. It is not possible to change their baudrate.

Cc: <stable@...r.kernel.org>
Signed-off-by: Pierre Gondois <Pierre.Gondois@....com>
---
 drivers/tty/serial/amba-pl011.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index d361cd84ff8c..52518a606c06 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2947,6 +2947,7 @@ MODULE_DEVICE_TABLE(of, sbsa_uart_of_match);
 
 static const struct acpi_device_id __maybe_unused sbsa_uart_acpi_match[] = {
 	{ "ARMH0011", 0 },
+	{ "ARMHB000", 0 },
 	{},
 };
 MODULE_DEVICE_TABLE(acpi, sbsa_uart_acpi_match);
-- 
2.17.1