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Diffstat (limited to 'Documentation/ABI/testing/debugfs-pcie-ptm')
| -rw-r--r-- | Documentation/ABI/testing/debugfs-pcie-ptm | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/debugfs-pcie-ptm b/Documentation/ABI/testing/debugfs-pcie-ptm new file mode 100644 index 000000000000..602d41363571 --- /dev/null +++ b/Documentation/ABI/testing/debugfs-pcie-ptm @@ -0,0 +1,70 @@ +What: /sys/kernel/debug/pcie_ptm_*/local_clock +Date: May 2025 +Contact: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> +Description: + (RO) PTM local clock in nanoseconds. Applicable for both Root + Complex and Endpoint controllers. + +What: /sys/kernel/debug/pcie_ptm_*/master_clock +Date: May 2025 +Contact: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> +Description: + (RO) PTM master clock in nanoseconds. Applicable only for + Endpoint controllers. + +What: /sys/kernel/debug/pcie_ptm_*/t1 +Date: May 2025 +Contact: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> +Description: + (RO) PTM T1 timestamp in nanoseconds. Applicable only for + Endpoint controllers. + +What: /sys/kernel/debug/pcie_ptm_*/t2 +Date: May 2025 +Contact: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> +Description: + (RO) PTM T2 timestamp in nanoseconds. Applicable only for + Root Complex controllers. + +What: /sys/kernel/debug/pcie_ptm_*/t3 +Date: May 2025 +Contact: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> +Description: + (RO) PTM T3 timestamp in nanoseconds. Applicable only for + Root Complex controllers. + +What: /sys/kernel/debug/pcie_ptm_*/t4 +Date: May 2025 +Contact: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> +Description: + (RO) PTM T4 timestamp in nanoseconds. Applicable only for + Endpoint controllers. + +What: /sys/kernel/debug/pcie_ptm_*/context_update +Date: May 2025 +Contact: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> +Description: + (RW) Control the PTM context update mode. Applicable only for + Endpoint controllers. + + Following values are supported: + + * auto = PTM context auto update trigger for every 10ms + + * manual = PTM context manual update. Writing 'manual' to this + file triggers PTM context update (default) + +What: /sys/kernel/debug/pcie_ptm_*/context_valid +Date: May 2025 +Contact: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> +Description: + (RW) Control the PTM context validity (local clock timing). + Applicable only for Root Complex controllers. PTM context is + invalidated by hardware if the Root Complex enters low power + mode or changes link frequency. + + Following values are supported: + + * 0 = PTM context invalid (default) + + * 1 = PTM context valid |