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serial: max3100: Get crystal frequency via device property

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Get crystal frequency via device property instead of using
a platform data.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240409144721.638326-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2024-04-09 17:45:49 +03:00 committed by Greg Kroah-Hartman
parent 771d22bce7
commit 61f538f23a
1 changed files with 20 additions and 29 deletions
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49
drivers/tty/serial/max3100.c
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@ -20,6 +20,7 @@
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/spi/spi.h>
@ -30,17 +31,6 @@
#include <asm/unaligned.h>
/**
* struct plat_max3100 - MAX3100 SPI UART platform data
* @crystal: 1 for 3.6864 Mhz, 0 for 1.8432
*
* You should use this structure in your machine description to specify
* how the MAX3100 is connected.
*/
struct plat_max3100 {
int crystal;
};
#define MAX3100_C (1<<14)
#define MAX3100_D (0<<14)
#define MAX3100_W (1<<15)
@ -106,7 +96,6 @@ struct max3100_port {
int irq; /* irq assigned to the max3100 */
int minor; /* minor number */
int crystal; /* 1 if 3.6864Mhz crystal 0 for 1.8432 */
int loopback_commit; /* need to change loopback */
int loopback; /* 1 if we are in loopback mode */
@ -426,7 +415,8 @@ max3100_set_termios(struct uart_port *port, struct ktermios *termios,
struct max3100_port *s = container_of(port,
struct max3100_port,
port);
int baud = 0;
unsigned int baud = port->uartclk / 16;
unsigned int baud230400 = (baud == 230400) ? 1 : 0;
unsigned cflag;
u32 param_new, param_mask, parity = 0;
@ -439,40 +429,40 @@ max3100_set_termios(struct uart_port *port, struct ktermios *termios,
param_new = s->conf & MAX3100_BAUD;
switch (baud) {
case 300:
if (s->crystal)
if (baud230400)
baud = s->baud;
else
param_new = 15;
break;
case 600:
param_new = 14 + s->crystal;
param_new = 14 + baud230400;
break;
case 1200:
param_new = 13 + s->crystal;
param_new = 13 + baud230400;
break;
case 2400:
param_new = 12 + s->crystal;
param_new = 12 + baud230400;
break;
case 4800:
param_new = 11 + s->crystal;
param_new = 11 + baud230400;
break;
case 9600:
param_new = 10 + s->crystal;
param_new = 10 + baud230400;
break;
case 19200:
param_new = 9 + s->crystal;
param_new = 9 + baud230400;
break;
case 38400:
param_new = 8 + s->crystal;
param_new = 8 + baud230400;
break;
case 57600:
param_new = 1 + s->crystal;
param_new = 1 + baud230400;
break;
case 115200:
param_new = 0 + s->crystal;
param_new = 0 + baud230400;
break;
case 230400:
if (s->crystal)
if (baud230400)
param_new = 0;
else
baud = s->baud;
@ -575,7 +565,7 @@ static int max3100_startup(struct uart_port *port)
dev_dbg(&s->spi->dev, "%s\n", __func__);
s->conf = MAX3100_RM;
s->baud = s->crystal ? 230400 : 115200;
s->baud = port->uartclk / 16;
s->rx_enabled = 1;
if (s->suspending)
@ -718,8 +708,8 @@ static int uart_driver_registered;
static int max3100_probe(struct spi_device *spi)
{
struct device *dev = &spi->dev;
int i, retval;
struct plat_max3100 *pdata;
u16 rx;
mutex_lock(&max3100s_lock);
@ -755,20 +745,21 @@ static int max3100_probe(struct spi_device *spi)
max3100s[i]->irq = spi->irq;
spin_lock_init(&max3100s[i]->conf_lock);
spi_set_drvdata(spi, max3100s[i]);
pdata = dev_get_platdata(&spi->dev);
max3100s[i]->crystal = pdata->crystal;
max3100s[i]->minor = i;
timer_setup(&max3100s[i]->timer, max3100_timeout, 0);
dev_dbg(&spi->dev, "%s: adding port %d\n", __func__, i);
max3100s[i]->port.irq = max3100s[i]->irq;
max3100s[i]->port.uartclk = max3100s[i]->crystal ? 3686400 : 1843200;
max3100s[i]->port.fifosize = 16;
max3100s[i]->port.ops = &max3100_ops;
max3100s[i]->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
max3100s[i]->port.line = i;
max3100s[i]->port.type = PORT_MAX3100;
max3100s[i]->port.dev = &spi->dev;
/* Read clock frequency from a property, uart_add_one_port() will fail if it's not set */
device_property_read_u32(dev, "clock-frequency", &max3100s[i]->port.uartclk);
retval = uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port);
if (retval < 0)
dev_warn(&spi->dev,