linux-kernel - [PATCH 4.4 52/52] serial: pl011: Add ACPI SBSA UART match id

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Message-Id: <20211206145549.666678336@linuxfoundation.org>
Date:   Mon,  6 Dec 2021 15:56:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pierre Gondois <Pierre.Gondois@....com>
Subject: [PATCH 4.4 52/52] serial: pl011: Add ACPI SBSA UART match id

From: Pierre Gondois <Pierre.Gondois@....com>

commit ac442a077acf9a6bf1db4320ec0c3f303be092b3 upstream.

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>
Link: https://lore.kernel.org/r/20211109172248.19061-1-Pierre.Gondois@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/tty/serial/amba-pl011.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -2493,6 +2493,7 @@ MODULE_DEVICE_TABLE(of, sbsa_uart_of_mat
 
 static const struct acpi_device_id sbsa_uart_acpi_match[] = {
 	{ "ARMH0011", 0 },
+	{ "ARMHB000", 0 },
 	{},
 };
 MODULE_DEVICE_TABLE(acpi, sbsa_uart_acpi_match);