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dt-bindings:nvpps:Document property to set initial operating mode

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Add documentation for the new 'nvpps-event-mode-init'
property in the NVIDIA nvpps driver devicetree bindings.
This optional property allows users to specify whether the
driver should start in GPIO mode (1) or TIMER mode (2).
If not specified then default mode is chosen based on
if the nvpps-gpios property is defined or not.

bug 5253938

Change-Id: I624e50458383a5a61efdb4d5dd790b4a1dc7bb7e
Signed-off-by: Sheetal Tigadoli <stigadoli@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3352703
(cherry picked from commit 3e3c946b6b0122b5cb9afe4f3150301c7f64b3a0)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3361725
Reviewed-by: Sumeet Gupta <sumeetg@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Sheetal Tigadoli
2025-04-30 17:35:33 +00:00
committed by Jon Hunter
parent ff1bc4d840
commit 148c895a23
1 changed files with 7 additions and 0 deletions
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7
Documentation/devicetree/bindings/nvpps/nvpps.txt
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@@ -47,6 +47,11 @@ Optional properties:
Valid range is from 100ms to 1000ms. This property determines how often
the driver collects timestamp data. If this property is not specified,
the driver will collect timestamps every 1000ms(1s) by default.
- nvpps-event-mode-init: Optional property that specifies the initial operating mode of the NvPPS driver.
Valid values are 1 (GPIO mode) and 2 (TIMER mode). If this property is not
specified, the default mode is determined based on the presence of the
nvpps-gpios property - GPIO mode becomes the default when nvpps-gpios is
specified, otherwise TIMER mode is used as the default.
Example: Timer mode on Orin.
@@ -100,6 +105,7 @@ nvpps {
nvpps-gpios = <&gpio_aon TEGRA234_AON_GPIO(BB, 0) GPIO_ACTIVE_HIGH>;
timestamps = <&hte_aon TEGRA234_AON_GPIO(BB, 0)>;
timestamp-names = "nvpps_gpio";
nvpps-event-mode-init = <1>; /* 1 for GPIO mode, 2 for TIMER mode */
};
@@ -117,4 +123,5 @@ nvpps {
ptp_tsc_lock_threshold = /bits/ 16 <0x26C>;
ptp_tsc_sync_dis;
ts-capture-interval = <1000>;
nvpps-event-mode-init = <2>; /* 1 for GPIO mode, 2 for TIMER mode */
};