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authorLaurent Pinchart <laurentp@cse-semaphore.com>2008-07-28 10:42:16 +0200
committerKumar Gala <galak@kernel.crashing.org>2008-07-28 08:47:32 -0500
commit80776554b6c93cf828ddc702010c6a189aa0d0e9 (patch)
tree23d4ce7299449b778a28c2de531ec40292235706
parent7485d26b7e13ee8ff82adb271ac90a996c1fe830 (diff)
cpm_uart: Add generic clock API support to set baudrates
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>
-rw-r--r--arch/powerpc/platforms/Kconfig1
-rw-r--r--drivers/serial/cpm_uart/cpm_uart.h1
-rw-r--r--drivers/serial/cpm_uart/cpm_uart_core.c26
3 files changed, 21 insertions, 7 deletions
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index 18a71839dc9..4c900efa164 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -283,6 +283,7 @@ config FSL_ULI1575
config CPM
bool
+ select PPC_CLOCK
config OF_RTC
bool
diff --git a/drivers/serial/cpm_uart/cpm_uart.h b/drivers/serial/cpm_uart/cpm_uart.h
index 5999ef5ac78..7274b527a3c 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 5e0c17f7165..25efca5a7a1 100644
--- a/drivers/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/serial/cpm_uart/cpm_uart_core.c
@@ -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>
@@ -596,7 +597,10 @@ 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);
}
@@ -1023,13 +1027,21 @@ 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) {