linux-kernel - [-next] serial: 8250: Match legacy NS16550A UARTs

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Message-Id: <20210414134539.42332-1-alcooperx@gmail.com>
Date:   Wed, 14 Apr 2021 09:45:39 -0400
From:   Al Cooper <alcooperx@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        Al Cooper <alcooperx@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>, linux-serial@...r.kernel.org
Subject: [-next] serial: 8250: Match legacy NS16550A UARTs

From: Florian Fainelli <f.fainelli@...il.com>

Older 32-bit only Broadcom STB chips used a NS16550A compatible UART,
the 8250_bcm7271.c driver can drive those UARTs just fine provided that
we let it match the appropriate compatible string.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Reviewed-by: Al Cooper <alcooperx@...il.com>
---
 drivers/tty/serial/8250/8250_bcm7271.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_bcm7271.c b/drivers/tty/serial/8250/8250_bcm7271.c
index 725a450058f8..023a2de8b2d6 100644
--- a/drivers/tty/serial/8250/8250_bcm7271.c
+++ b/drivers/tty/serial/8250/8250_bcm7271.c
@@ -204,6 +204,13 @@ static const u32 brcmstb_rate_table_7278[] = {
 	MHZ(48),
 };
 
+static const u32 brcmstb_rate_table_16550a[] = {
+	MHZ(81),
+	0,
+	0,
+	0,
+};
+
 struct brcmuart_priv {
 	int		line;
 	struct clk	*baud_mux_clk;
@@ -865,6 +872,10 @@ static const struct of_device_id brcmuart_dt_ids[] = {
 		.compatible = "brcm,bcm7271-uart",
 		.data = brcmstb_rate_table,
 	},
+	{
+		.compatible = "ns16550a",
+		.data = brcmstb_rate_table_16550a,
+	},
 	{},
 };
 
-- 
2.17.1