linux-kernel - [PATCH v1 1/1] serial: 8250_dw: Replace ACPI device check by a quirk

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Message-ID: <20240306143322.3291123-1-andriy.shevchenko@linux.intel.com>
Date: Wed,  6 Mar 2024 16:33:22 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>
Subject: [PATCH v1 1/1] serial: 8250_dw: Replace ACPI device check by a quirk

Instead of checking for APMC0D08 ACPI device presence,
use a quirk based on driver data.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/tty/serial/8250/8250_dw.c | 51 ++++++++++++++++---------------
 1 file changed, 26 insertions(+), 25 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 9ac4be748596..a3acbf0f5da1 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -9,7 +9,6 @@
  * LCR is written whilst busy.  If it is, then a busy detect interrupt is
  * raised, the LCR needs to be rewritten and the uart status register read.
  */
-#include <linux/acpi.h>
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/device.h>
@@ -55,6 +54,7 @@
 #define DW_UART_QUIRK_ARMADA_38X	BIT(1)
 #define DW_UART_QUIRK_SKIP_SET_RATE	BIT(2)
 #define DW_UART_QUIRK_IS_DMA_FC		BIT(3)
+#define DW_UART_QUIRK_APMC0D08		BIT(4)
 
 static inline struct dw8250_data *clk_to_dw8250_data(struct notifier_block *nb)
 {
@@ -444,33 +444,29 @@ static void dw8250_prepare_rx_dma(struct uart_8250_port *p)
 
 static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data)
 {
-	struct device_node *np = p->dev->of_node;
-
-	if (np) {
-		unsigned int quirks = data->pdata->quirks;
+	unsigned int quirks = data->pdata ? data->pdata->quirks : 0;
 
 #ifdef CONFIG_64BIT
-		if (quirks & DW_UART_QUIRK_OCTEON) {
-			p->serial_in = dw8250_serial_inq;
-			p->serial_out = dw8250_serial_outq;
-			p->flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_FIXED_TYPE;
-			p->type = PORT_OCTEON;
-			data->skip_autocfg = true;
-		}
+	if (quirks & DW_UART_QUIRK_OCTEON) {
+		p->serial_in = dw8250_serial_inq;
+		p->serial_out = dw8250_serial_outq;
+		p->flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_FIXED_TYPE;
+		p->type = PORT_OCTEON;
+		data->skip_autocfg = true;
+	}
 #endif
 
-		if (quirks & DW_UART_QUIRK_ARMADA_38X)
-			p->serial_out = dw8250_serial_out38x;
-		if (quirks & DW_UART_QUIRK_SKIP_SET_RATE)
-			p->set_termios = dw8250_do_set_termios;
-		if (quirks & DW_UART_QUIRK_IS_DMA_FC) {
-			data->data.dma.txconf.device_fc = 1;
-			data->data.dma.rxconf.device_fc = 1;
-			data->data.dma.prepare_tx_dma = dw8250_prepare_tx_dma;
-			data->data.dma.prepare_rx_dma = dw8250_prepare_rx_dma;
-		}
-
-	} else if (acpi_dev_present("APMC0D08", NULL, -1)) {
+	if (quirks & DW_UART_QUIRK_ARMADA_38X)
+		p->serial_out = dw8250_serial_out38x;
+	if (quirks & DW_UART_QUIRK_SKIP_SET_RATE)
+		p->set_termios = dw8250_do_set_termios;
+	if (quirks & DW_UART_QUIRK_IS_DMA_FC) {
+		data->data.dma.txconf.device_fc = 1;
+		data->data.dma.rxconf.device_fc = 1;
+		data->data.dma.prepare_tx_dma = dw8250_prepare_tx_dma;
+		data->data.dma.prepare_rx_dma = dw8250_prepare_rx_dma;
+	}
+	if (quirks & DW_UART_QUIRK_APMC0D08) {
 		p->iotype = UPIO_MEM32;
 		p->regshift = 2;
 		p->serial_in = dw8250_serial_in32;
@@ -750,13 +746,18 @@ static const struct of_device_id dw8250_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, dw8250_of_match);
 
+static const struct dw8250_platform_data dw8250_apmc0d08 = {
+	.usr_reg = DW_UART_USR,
+	.quirks = DW_UART_QUIRK_APMC0D08,
+};
+
 static const struct acpi_device_id dw8250_acpi_match[] = {
 	{ "80860F0A", (kernel_ulong_t)&dw8250_dw_apb },
 	{ "8086228A", (kernel_ulong_t)&dw8250_dw_apb },
 	{ "AMD0020", (kernel_ulong_t)&dw8250_dw_apb },
 	{ "AMDI0020", (kernel_ulong_t)&dw8250_dw_apb },
 	{ "AMDI0022", (kernel_ulong_t)&dw8250_dw_apb },
-	{ "APMC0D08", (kernel_ulong_t)&dw8250_dw_apb},
+	{ "APMC0D08", (kernel_ulong_t)&dw8250_apmc0d08 },
 	{ "BRCM2032", (kernel_ulong_t)&dw8250_dw_apb },
 	{ "HISI0031", (kernel_ulong_t)&dw8250_dw_apb },
 	{ "INT33C4", (kernel_ulong_t)&dw8250_dw_apb },
-- 
2.43.0.rc1.1.gbec44491f096