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serial: sccnxp: Using CLK API for getting UART clock

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This patch removes "frequency" parameter from SCCNXP platform_data
and uses CLK API for getting clock. If CLK ommited, default IC
frequency will be used instead.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shiyan 2013-07-31 14:56:30 +04:00 committed by Greg Kroah-Hartman
parent e087ab74f3
commit 90efa75f7a
3 changed files with 22 additions and 18 deletions
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1
arch/mips/sni/a20r.c
View File

@ -122,7 +122,6 @@ static struct resource sc26xx_rsrc[] = {
static struct sccnxp_pdata sccnxp_data = {
.reg_shift = 2,
.frequency = 3686400,
.mctrl_cfg[0] = MCTRL_SIG(DTR_OP, LINE_OP7) |
MCTRL_SIG(RTS_OP, LINE_OP3) |
MCTRL_SIG(DSR_IP, LINE_IP5) |

36
drivers/tty/serial/sccnxp.c
View File

@ -15,6 +15,7 @@
#define SUPPORT_SYSRQ
#endif
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/device.h>
@ -783,9 +784,10 @@ static int sccnxp_probe(struct platform_device *pdev)
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
int chiptype = pdev->id_entry->driver_data;
struct sccnxp_pdata *pdata = dev_get_platdata(&pdev->dev);
int i, ret, fifosize, freq_min, freq_max;
int i, ret, fifosize, freq_min, freq_max, uartclk;
struct sccnxp_port *s;
void __iomem *membase;
struct clk *clk;
membase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(membase))
@ -898,11 +900,25 @@ static int sccnxp_probe(struct platform_device *pdev)
} else if (PTR_ERR(s->regulator) == -EPROBE_DEFER)
return -EPROBE_DEFER;
if (!pdata) {
dev_warn(&pdev->dev,
"No platform data supplied, using defaults\n");
s->pdata.frequency = s->freq_std;
clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
if (PTR_ERR(clk) == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto err_out;
}
dev_notice(&pdev->dev, "Using default clock frequency\n");
uartclk = s->freq_std;
} else
uartclk = clk_get_rate(clk);
/* Check input frequency */
if ((uartclk < freq_min) || (uartclk > freq_max)) {
dev_err(&pdev->dev, "Frequency out of bounds\n");
ret = -EINVAL;
goto err_out;
}
if (pdata)
memcpy(&s->pdata, pdata, sizeof(struct sccnxp_pdata));
if (s->pdata.poll_time_us) {
@ -920,14 +936,6 @@ static int sccnxp_probe(struct platform_device *pdev)
}
}
/* Check input frequency */
if ((s->pdata.frequency < freq_min) ||
(s->pdata.frequency > freq_max)) {
dev_err(&pdev->dev, "Frequency out of bounds\n");
ret = -EINVAL;
goto err_out;
}
s->uart.owner = THIS_MODULE;
s->uart.dev_name = "ttySC";
s->uart.major = SCCNXP_MAJOR;
@ -959,7 +967,7 @@ static int sccnxp_probe(struct platform_device *pdev)
s->port[i].mapbase = res->start;
s->port[i].membase = membase;
s->port[i].regshift = s->pdata.reg_shift;
s->port[i].uartclk = s->pdata.frequency;
s->port[i].uartclk = uartclk;
s->port[i].ops = &sccnxp_ops;
uart_add_one_port(&s->uart, &s->port[i]);
/* Set direction to input */

3
include/linux/platform_data/serial-sccnxp.h
View File

@ -60,7 +60,6 @@
* };
*
* static struct sccnxp_pdata sc2892_info = {
* .frequency = 3686400,
* .mctrl_cfg[0] = MCTRL_SIG(DIR_OP, LINE_OP0),
* .mctrl_cfg[1] = MCTRL_SIG(DIR_OP, LINE_OP1),
* };
@ -78,8 +77,6 @@
/* SCCNXP platform data structure */
struct sccnxp_pdata {
/* Frequency (extrenal clock or crystal) */
int frequency;
/* Shift for A0 line */
const u8 reg_shift;
/* Modem control lines configuration */