linux-kernel - [PATCH 1/4] serial: max310x: use regmap methods for SPI batch operations

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Date:   Tue, 31 May 2022 01:14:26 +0300
From:   Cosmin Tanislav <demonsingur@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Cosmin Tanislav <cosmin.tanislav@...log.com>
Subject: [PATCH 1/4] serial: max310x: use regmap methods for SPI batch operations

From: Cosmin Tanislav <cosmin.tanislav@...log.com>

The SPI batch read/write operations can be implemented as simple
regmap raw read and write, which will also try to do a gather
write just as it is done here.

Use the regmap raw read and write methods.

Signed-off-by: Cosmin Tanislav <cosmin.tanislav@...log.com>
---
 drivers/tty/serial/max310x.c | 36 ++++++++----------------------------
 1 file changed, 8 insertions(+), 28 deletions(-)

diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index a0b6ea52d133..46887a4ffea4 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -259,8 +259,6 @@ struct max310x_one {
 	struct work_struct	md_work;
 	struct work_struct	rs_work;
 
-	u8 wr_header;
-	u8 rd_header;
 	u8 rx_buf[MAX310X_FIFO_SIZE];
 };
 #define to_max310x_port(_port) \
@@ -623,32 +621,18 @@ static u32 max310x_set_ref_clk(struct device *dev, struct max310x_port *s,
 
 static void max310x_batch_write(struct uart_port *port, u8 *txbuf, unsigned int len)
 {
-	struct max310x_one *one = to_max310x_port(port);
-	struct spi_transfer xfer[] = {
-		{
-			.tx_buf = &one->wr_header,
-			.len = sizeof(one->wr_header),
-		}, {
-			.tx_buf = txbuf,
-			.len = len,
-		}
-	};
-	spi_sync_transfer(to_spi_device(port->dev), xfer, ARRAY_SIZE(xfer));
+	struct max310x_port *s = dev_get_drvdata(port->dev);
+	u8 reg = port->iobase + MAX310X_THR_REG;
+
+	regmap_raw_write(s->regmap, reg, txbuf, len);
 }
 
 static void max310x_batch_read(struct uart_port *port, u8 *rxbuf, unsigned int len)
 {
-	struct max310x_one *one = to_max310x_port(port);
-	struct spi_transfer xfer[] = {
-		{
-			.tx_buf = &one->rd_header,
-			.len = sizeof(one->rd_header),
-		}, {
-			.rx_buf = rxbuf,
-			.len = len,
-		}
-	};
-	spi_sync_transfer(to_spi_device(port->dev), xfer, ARRAY_SIZE(xfer));
+	struct max310x_port *s = dev_get_drvdata(port->dev);
+	u8 reg = port->iobase + MAX310X_RHR_REG;
+
+	regmap_raw_read(s->regmap, reg, rxbuf, len);
 }
 
 static void max310x_handle_rx(struct uart_port *port, unsigned int rxlen)
@@ -1368,10 +1352,6 @@ static int max310x_probe(struct device *dev, const struct max310x_devtype *devty
 		INIT_WORK(&s->p[i].md_work, max310x_md_proc);
 		/* Initialize queue for changing RS485 mode */
 		INIT_WORK(&s->p[i].rs_work, max310x_rs_proc);
-		/* Initialize SPI-transfer buffers */
-		s->p[i].wr_header = (s->p[i].port.iobase + MAX310X_THR_REG) |
-				    MAX310X_WRITE_BIT;
-		s->p[i].rd_header = (s->p[i].port.iobase + MAX310X_RHR_REG);
 
 		/* Register port */
 		ret = uart_add_one_port(&max310x_uart, &s->p[i].port);
-- 
2.36.1