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cpm_uart: Add generic clock API support to set baudrates

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This patch introduces baudrate setting support via the generic clock API.
When present the optional device tree clock property is used instead of
fsl-cpm-brg. Platforms can then define complex clock schemes, to output
the serial clock on an external pin for instance.

Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Laurent Pinchart 2008-07-28 10:42:16 +02:00 • committed by Kumar Gala
parent 7485d26b7e
commit 80776554b6
3 changed files with 21 additions and 7 deletions
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1
arch/powerpc/platforms/Kconfig
View file

@ -283,6 +283,7 @@ config FSL_ULI1575
config CPM
bool
select PPC_CLOCK
config OF_RTC
bool

1
drivers/serial/cpm_uart/cpm_uart.h
View file

@ -77,6 +77,7 @@ struct uart_cpm_port {
unsigned char *rx_buf;
u32 flags;
void (*set_lineif)(struct uart_cpm_port *);
struct clk *clk;
u8 brg;
uint dp_addr;
void *mem_addr;

12
drivers/serial/cpm_uart/cpm_uart_core.c
View file

@ -45,6 +45,7 @@
#include <linux/of_platform.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/clk.h>
#include <asm/io.h>
#include <asm/irq.h>
@ -596,6 +597,9 @@ static void cpm_uart_set_termios(struct uart_port *port,
out_be16(&sccp->scc_psmr, (sbits << 12) | scval);
}
if (pinfo->clk)
clk_set_rate(pinfo->clk, baud);
else
cpm_set_brg(pinfo->brg - 1, baud);
spin_unlock_irqrestore(&port->lock, flags);
}
@ -1023,6 +1027,13 @@ static int cpm_uart_init_port(struct device_node *np,
int ret;
int i;
data = of_get_property(np, "clock", NULL);
if (data) {
struct clk *clk = clk_get(NULL, (const char*)data);
if (!IS_ERR(clk))
pinfo->clk = clk;
}
if (!pinfo->clk) {
data = of_get_property(np, "fsl,cpm-brg", &len);
if (!data || len != 4) {
printk(KERN_ERR "CPM UART %s has no/invalid "
@ -1030,6 +1041,7 @@ static int cpm_uart_init_port(struct device_node *np,
return -EINVAL;
}
pinfo->brg = *data;
}
data = of_get_property(np, "fsl,cpm-command", &len);
if (!data || len != 4) {