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cpts: specify the input clock frequency via DT
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>
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3 changed files with 22 additions and 0 deletions
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@ -24,6 +24,8 @@ Required properties:
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for the specific platform
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- slaves : Specifies number for slaves
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- cpts_active_slave : Specifies the slave to use for time stamping
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- cpts_clock_mult : Numerator to convert input clock ticks into nanoseconds
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- cpts_clock_shift : Denominator to convert input clock ticks into nanoseconds
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- slave_reg_ofs : Specifies slave register offset
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- sliver_reg_ofs : Specifies slave sliver register offset
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- phy_id : Specifies slave phy id
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@ -62,6 +64,8 @@ Examples:
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mac_control = <0x20>;
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slaves = <2>;
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cpts_active_slave = <0>;
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cpts_clock_mult = <0x80000000>;
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cpts_clock_shift = <29>;
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cpsw_emac0: slave@0 {
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slave_reg_ofs = <0x200>;
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sliver_reg_ofs = <0xd80>;
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@ -98,6 +102,8 @@ Examples:
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mac_control = <0x20>;
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slaves = <2>;
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cpts_active_slave = <0>;
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cpts_clock_mult = <0x80000000>;
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cpts_clock_shift = <29>;
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cpsw_emac0: slave@0 {
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slave_reg_ofs = <0x200>;
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sliver_reg_ofs = <0xd80>;
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@ -854,6 +854,20 @@ static int cpsw_probe_dt(struct cpsw_platform_data *data,
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}
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data->cpts_active_slave = prop;
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if (of_property_read_u32(node, "cpts_clock_mult", &prop)) {
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pr_err("Missing cpts_clock_mult property in the DT.\n");
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ret = -EINVAL;
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goto error_ret;
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}
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data->cpts_clock_mult = prop;
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if (of_property_read_u32(node, "cpts_clock_shift", &prop)) {
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pr_err("Missing cpts_clock_shift property in the DT.\n");
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ret = -EINVAL;
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goto error_ret;
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}
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data->cpts_clock_shift = prop;
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data->slave_data = kzalloc(sizeof(struct cpsw_slave_data) *
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data->slaves, GFP_KERNEL);
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if (!data->slave_data) {
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@ -34,6 +34,8 @@ struct cpsw_platform_data {
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u32 slaves; /* number of slave cpgmac ports */
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struct cpsw_slave_data *slave_data;
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u32 cpts_active_slave; /* time stamping slave */
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u32 cpts_clock_mult; /* convert input clock ticks to nanoseconds */
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u32 cpts_clock_shift; /* convert input clock ticks to nanoseconds */
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u32 ale_reg_ofs; /* address lookup engine reg offset */
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u32 ale_entries; /* ale table size */
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