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 <[EMAIL PROTECTED]>
---
drivers/serial/cpm_uart/cpm_uart.h | 1 +
drivers/serial/cpm_uart/cpm_uart_core.c | 26 +++++++++++++++++++-------
2 files changed, 20 insertions(+), 7 deletions(-)
On Friday 25 July 2008, Kumar Gala wrote:
> I'm having problems applying due to mailer formatting.
*sigh* I'll definitely have to fix GPG support in kmail. Sorry about the
annoyance.
diff --git a/drivers/serial/cpm_uart/cpm_uart.h
b/drivers/serial/cpm_uart/cpm_uart.h
index d0c55e2..2e64c03 100644
--- a/drivers/serial/cpm_uart/cpm_uart.h
+++ b/drivers/serial/cpm_uart/cpm_uart.h
@@ -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;
diff --git a/drivers/serial/cpm_uart/cpm_uart_core.c
b/drivers/serial/cpm_uart/cpm_uart_core.c
index d3c19e5..438e460 100644
--- a/drivers/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/serial/cpm_uart/cpm_uart_core.c
@@ -44,6 +44,7 @@
#include <linux/fs_uart_pd.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
+#include <linux/clk.h>
#include <asm/io.h>
#include <asm/irq.h>
@@ -641,7 +642,10 @@ static void cpm_uart_set_termios(struct uart_port *port,
out_be16(&sccp->scc_psmr, (sbits << 12) | scval);
}
- cpm_set_brg(pinfo->brg - 1, baud);
+ if (pinfo->clk)
+ clk_set_rate(pinfo->clk, baud);
+ else
+ cpm_set_brg(pinfo->brg - 1, baud);
spin_unlock_irqrestore(&port->lock, flags);
}
@@ -991,13 +995,21 @@ static int cpm_uart_init_port(struct device_node *np,
int ret;
int i;
- data = of_get_property(np, "fsl,cpm-brg", &len);
- if (!data || len != 4) {
- printk(KERN_ERR "CPM UART %s has no/invalid "
- "fsl,cpm-brg property.\n", np->name);
- return -EINVAL;
+ 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 "
+ "fsl,cpm-brg property.\n", np->name);
+ return -EINVAL;
+ }
+ pinfo->brg = *data;
}
- pinfo->brg = *data;
data = of_get_property(np, "fsl,cpm-command", &len);
if (!data || len != 4) {
--
1.5.0
--
Laurent Pinchart
CSE Semaphore Belgium
Chaussee de Bruxelles, 732A
B-1410 Waterloo
Belgium
T +32 (2) 387 42 59
F +32 (2) 387 42 75
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