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cpts: specify the input clock frequency via DT

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This patch adds a way to configure the CPTS input clock scaling factors
via the device tree.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Cochran 2012-10-29 08:45:19 +00:00 committed by David S. Miller
parent 78ca0b2873
commit 00ab94eeaf
3 changed files with 22 additions and 0 deletions
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6
Documentation/devicetree/bindings/net/cpsw.txt
View file

@ -24,6 +24,8 @@ Required properties:
for the specific platform
- slaves : Specifies number for slaves
- cpts_active_slave : Specifies the slave to use for time stamping
- cpts_clock_mult : Numerator to convert input clock ticks into nanoseconds
- cpts_clock_shift : Denominator to convert input clock ticks into nanoseconds
- slave_reg_ofs : Specifies slave register offset
- sliver_reg_ofs : Specifies slave sliver register offset
- phy_id : Specifies slave phy id
@ -62,6 +64,8 @@ Examples:
mac_control = <0x20>;
slaves = <2>;
cpts_active_slave = <0>;
cpts_clock_mult = <0x80000000>;
cpts_clock_shift = <29>;
cpsw_emac0: slave@0 {
slave_reg_ofs = <0x200>;
sliver_reg_ofs = <0xd80>;
@ -98,6 +102,8 @@ Examples:
mac_control = <0x20>;
slaves = <2>;
cpts_active_slave = <0>;
cpts_clock_mult = <0x80000000>;
cpts_clock_shift = <29>;
cpsw_emac0: slave@0 {
slave_reg_ofs = <0x200>;
sliver_reg_ofs = <0xd80>;

14
drivers/net/ethernet/ti/cpsw.c
View file

@ -854,6 +854,20 @@ static int cpsw_probe_dt(struct cpsw_platform_data *data,
}
data->cpts_active_slave = prop;
if (of_property_read_u32(node, "cpts_clock_mult", &prop)) {
pr_err("Missing cpts_clock_mult property in the DT.\n");
ret = -EINVAL;
goto error_ret;
}
data->cpts_clock_mult = prop;
if (of_property_read_u32(node, "cpts_clock_shift", &prop)) {
pr_err("Missing cpts_clock_shift property in the DT.\n");
ret = -EINVAL;
goto error_ret;
}
data->cpts_clock_shift = prop;
data->slave_data = kzalloc(sizeof(struct cpsw_slave_data) *
data->slaves, GFP_KERNEL);
if (!data->slave_data) {

2
include/linux/platform_data/cpsw.h
View file

@ -34,6 +34,8 @@ struct cpsw_platform_data {
u32 slaves; /* number of slave cpgmac ports */
struct cpsw_slave_data *slave_data;
u32 cpts_active_slave; /* time stamping slave */
u32 cpts_clock_mult; /* convert input clock ticks to nanoseconds */
u32 cpts_clock_shift; /* convert input clock ticks to nanoseconds */
u32 ale_reg_ofs; /* address lookup engine reg offset */
u32 ale_entries; /* ale table size */