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2023-08-16Documentation: ABI: sysfs-bus-counter: Fix indentationBiju Das1-4/+4
Fix the indentation of the KernelVersion, Contact, and Description in external_input_phase_clock_select_available block by replacing spaces with tabs similar to other blocks. Reported-by: Pavel Machek <[email protected]> Closes: https://lore.kernel.org/r/[email protected]/ Signed-off-by: Biju Das <[email protected]> Link: https://lore.kernel.org/r/[email protected]/ Signed-off-by: William Breathitt Gray <[email protected]>
2023-06-08counter: i8254: Introduce the Intel 8254 interface library moduleWilliam Breathitt Gray1-0/+54
Exposes consumer library functions providing support for interfaces compatible with the venerable Intel 8254 Programmable Interval Timer (PIT). The Intel 8254 PIT first appeared in the early 1980s and was used initially in IBM PC compatibles. The popularity of the original Intel 825x family of chips led to many subsequent variants and clones of the interface in various chips and integrated circuits. Although still popular, interfaces compatible with the Intel 8254 PIT are nowdays typically found embedded in larger VLSI processing chips and FPGA components rather than as discrete ICs. A CONFIG_I8254 Kconfig option is introduced by this patch. Modules wanting access to these i8254 library functions should select this Kconfig option, and import the I8254 symbol namespace. Link: https://lore.kernel.org/r/f6fe32c2db9525d816ab1a01f45abad56c081652.1681665189.git.william.gray@linaro.org/ Signed-off-by: William Breathitt Gray <[email protected]>
2023-04-26Documentation: ABI: sysfs-bus-counter: add cascade_counts_enable and ↵Biju Das1-0/+32
external_input_phase_clock_select This commit adds cascade_counts_enable and external_input_phase_ clock_select items to counter ABI file. (e.g. for Renesas MTU3 hardware used for phase counting). Signed-off-by: Biju Das <[email protected]> Reviewed-by: William Breathitt Gray <[email protected]> Signed-off-by: Lee Jones <[email protected]> Link: https://lore.kernel.org/r/[email protected]
2022-09-30Documentation: ABI: sysfs-bus-counter: add frequency & num_overflows itemsJulien Panis1-0/+14
This commit adds frequency and num_overflows items to counter ABI file (e.g. for TI ECAP hardware used in capture operating mode). Signed-off-by: Julien Panis <[email protected]> Link: https://lore.kernel.org/r/[email protected]/ Signed-off-by: William Breathitt Gray <[email protected]> Link: https://lore.kernel.org/r/467ae80e97c586c6bc9c453c6156ffcb5d4853d6.1664318353.git.william.gray@linaro.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2022-09-30counter: Introduce the Count capture componentWilliam Breathitt Gray1-0/+7
Some devices provide a latch function to save historic Count values. This patch standardizes exposure of such functionality as Count capture components. A COUNTER_COMP_CAPTURE macro is provided for driver authors to define a capture component. A new event COUNTER_EVENT_CAPTURE is introduced to represent Count value capture events. Cc: Julien Panis <[email protected]> Link: https://lore.kernel.org/r/c239572ab4208d0d6728136e82a88ad464369a7a.1664204990.git.william.gray@linaro.org/ Signed-off-by: William Breathitt Gray <[email protected]> Link: https://lore.kernel.org/r/3cebaa0b807a225eb277d771504fe6dba7269ffd.1664318353.git.william.gray@linaro.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2022-09-30counter: Introduce the Signal polarity componentWilliam Breathitt Gray1-0/+14
The Signal polarity component represents the active level of a respective Signal. There are two possible states: positive (rising edge) and negative (falling edge); enum counter_signal_polarity represents these states. A convenience macro COUNTER_COMP_POLARITY() is provided for driver authors to declare a Signal polarity component. Cc: Julien Panis <[email protected]> Link: https://lore.kernel.org/r/8f47d6e1db71a11bb1e2666f8e2a6e9d256d4131.1664204990.git.william.gray@linaro.org/ Signed-off-by: William Breathitt Gray <[email protected]> Link: https://lore.kernel.org/r/b6e53438badcb6318997d13dd2fc052f97d808ac.1664318353.git.william.gray@linaro.org Signed-off-by: Greg Kroah-Hartman <[email protected]>
2021-10-17counter: Implement events_queue_size sysfs attributeWilliam Breathitt Gray1-0/+8
The events_queue_size sysfs attribute provides a way for users to dynamically configure the Counter events queue size for the Counter character device interface. The size is in number of struct counter_event data structures. The number of elements will be rounded-up to a power of 2 due to a requirement of the kfifo_alloc function called during reallocation of the queue. Cc: Oleksij Rempel <[email protected]> Signed-off-by: William Breathitt Gray <[email protected]> Link: https://lore.kernel.org/r/c914b2db2ea0a2637633bcc3e86ded3c94783f2e.1632884256.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <[email protected]>
2021-10-17counter: Implement *_component_id sysfs attributesWilliam Breathitt Gray1-1/+15
The Generic Counter chrdev interface expects users to supply component IDs in order to select extensions for requests. In order for users to know what component ID belongs to which extension this information must be exposed. The *_component_id attribute provides a way for users to discover what component ID belongs to which respective extension. Cc: David Lechner <[email protected]> Cc: Gwendal Grignou <[email protected]> Cc: Dan Carpenter <[email protected]> Signed-off-by: William Breathitt Gray <[email protected]> Link: https://lore.kernel.org/r/8961a11edbb882fc689e468194f5be75f572443e.1632884256.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <[email protected]>
2021-10-17counter: Implement signalZ_action_component_id sysfs attributeWilliam Breathitt Gray1-0/+7
The Generic Counter chrdev interface expects users to supply component IDs in order to select Synapses for requests. In order for users to know what component ID belongs to which Synapse this information must be exposed. The signalZ_action_component_id attribute provides a way for users to discover what component ID belongs to the respective Synapse. Cc: Gwendal Grignou <[email protected]> Cc: Dan Carpenter <[email protected]> Reviewed-by: David Lechner <[email protected]> Signed-off-by: William Breathitt Gray <[email protected]> Link: https://lore.kernel.org/r/a6c81b2f1f5d0b8d59b1ebe4f0fed04914b07547.1632884256.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <[email protected]>
2021-10-17docs: counter: Update to reflect sysfs internalizationWilliam Breathitt Gray1-1/+8
The Counter subsystem architecture and driver implementations have changed in order to handle Counter sysfs interactions in a more consistent way. This patch updates the Generic Counter interface documentation to reflect the changes. Reviewed-by: David Lechner <[email protected]> Signed-off-by: William Breathitt Gray <[email protected]> Link: https://lore.kernel.org/r/91cded13c0145c0d3d0acfe765a2ccb6c9af7c3b.1630031207.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <[email protected]>
2021-06-09docs: counter: Consolidate Counter sysfs attributes documentationWilliam Breathitt Gray1-2/+74
Duplicate ABIs are not valid, so let's consolidate these sysfs attributes into the main sysfs-bus-counter documentation file. Cc: Patrick Havelange <[email protected]> Reviewed-by: David Lechner <[email protected]> Signed-off-by: William Breathitt Gray <[email protected]> Link: https://lore.kernel.org/r/c651ec1c541754ad108160839e2b8425ad089819.1623201081.git.vilhelm.gray@gmail.com Signed-off-by: Jonathan Cameron <[email protected]>
2021-06-03counter: Add support for Intel Quadrature Encoder PeripheralJarkko Nikula1-0/+9
Add support for Intel Quadrature Encoder Peripheral found on Intel Elkhart Lake platform. Initial implementation was done by Felipe Balbi while he was working at Intel with later changes from Raymond Tan and me. Co-developed-by: Felipe Balbi (Intel) <[email protected]> Signed-off-by: Felipe Balbi (Intel) <[email protected]> Co-developed-by: Raymond Tan <[email protected]> Signed-off-by: Raymond Tan <[email protected]> Signed-off-by: Jarkko Nikula <[email protected]> Acked-by: William Breathitt Gray <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jonathan Cameron <[email protected]>
2019-04-25counter: Documentation: Add Generic Counter sysfs documentationWilliam Breathitt Gray1-0/+230
This patch adds standard documentation for the userspace sysfs attributes of the Generic Counter interface. Reviewed-by: Jonathan Cameron <[email protected]> Signed-off-by: William Breathitt Gray <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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