linux-kernel - [PATCH 2/2] serial: 8250_dw: Add Sophgo SG2044 quirk

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Message-ID: <20241009233908.153188-3-inochiama@gmail.com>
Date: Thu, 10 Oct 2024 07:39:06 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Chen Wang <unicorn_wang@...look.com>,
	Inochi Amaoto <inochiama@...look.com>
Cc: Yixun Lan <dlan@...too.org>,
	Inochi Amaoto <inochiama@...il.com>,
	linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: [PATCH 2/2] serial: 8250_dw: Add Sophgo SG2044 quirk

SG2044 relys on an internal divisor when calculating bitrate, which
means a wrong clock for the most common bitrates. So add a quirk for
this uart device to skip the set rate call and only relys on the
internal UART divisor.

Signed-off-by: Inochi Amaoto <inochiama@...il.com>
---
 drivers/tty/serial/8250/8250_dw.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index ab9e7f204260..6b7c75670f29 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -750,6 +750,11 @@ static const struct dw8250_platform_data dw8250_renesas_rzn1_data = {
 	.quirks = DW_UART_QUIRK_CPR_VALUE | DW_UART_QUIRK_IS_DMA_FC,
 };
 
+static const struct dw8250_platform_data dw8250_sophgo_sg2044_data = {
+	.usr_reg = DW_UART_USR,
+	.quirks = DW_UART_QUIRK_SKIP_SET_RATE,
+};
+
 static const struct dw8250_platform_data dw8250_starfive_jh7100_data = {
 	.usr_reg = DW_UART_USR,
 	.quirks = DW_UART_QUIRK_SKIP_SET_RATE,
@@ -760,6 +765,7 @@ static const struct of_device_id dw8250_of_match[] = {
 	{ .compatible = "cavium,octeon-3860-uart", .data = &dw8250_octeon_3860_data },
 	{ .compatible = "marvell,armada-38x-uart", .data = &dw8250_armada_38x_data },
 	{ .compatible = "renesas,rzn1-uart", .data = &dw8250_renesas_rzn1_data },
+	{ .compatible = "sophgo,sg2044-uart", .data = &dw8250_sophgo_sg2044_data },
 	{ .compatible = "starfive,jh7100-uart", .data = &dw8250_starfive_jh7100_data },
 	{ /* Sentinel */ }
 };
-- 
2.47.0