| Message ID | 1642686255-25951-3-git-send-email-akhilrajeev@nvidia.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Enable named interrupt smbus-alert for ACPI | expand |
Fri, Jan 21, 2022 at 2:50 PM Akhil R <akhilrajeev@nvidia.com> wrote: > > > > > > Added details and example for named interrupts in the ACPI table. > > > > > > Added details and example for --> Add a detailed example of the > > > > > > ... > > > > > > > + Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive) { > > > > + 0x20, > > > > > > I would think of splitting this to two separate entries in between > > > of which the > > > GpioInt() resource is provided. It will explicitly show that you > > > describe the case only for Interrupt(). Something like > > > > > > Interrupt (...) { 0x20 } > > > GpioInt(...) { ... } > > > Interrupt (...) { 0x24 } > > > > > > But it's up to you. > > Instead, would it be good to add a statement mentioning this > > explicitly. Something like - > > > > The interrupt name 'default' will correspond to 0x20 in Interrupt() > > resource and 'alert' to 0x24. Note that only the Interrupt() resource > > is mapped and not GpioInt() or similar. > > > > I feel mixing these in the example would add a bit of confusion to the reader. > > That's why I added "up to you" in my previous reply. I also thought about the > example being a bit confusing for a reader who is non-familiar with the ACPI. Thanks. Will send out an updated patch. Thanks, Akhil
diff --git a/Documentation/firmware-guide/acpi/enumeration.rst b/Documentation/firmware-guide/acpi/enumeration.rst index 74b830b2..595deba 100644 --- a/Documentation/firmware-guide/acpi/enumeration.rst +++ b/Documentation/firmware-guide/acpi/enumeration.rst @@ -143,6 +143,44 @@ In robust cases the client unfortunately needs to call acpi_dma_request_slave_chan_by_index() directly and therefore choose the specific FixedDMA resource by its index. +Named Interrupts +================ + +Drivers enumerated via ACPI can have names to interrupts in the ACPI table +which can be used to get the IRQ number in the driver. + +The interrupt name can be listed in _DSD as 'interrupt-names'. The names +should be listed as an array of strings which will map to the Interrupt() +resource in the ACPI table corresponding to its index. + +The table below shows an example of its usage:: + + Device (DEV0) { + ... + Name (_CRS, ResourceTemplate() { + ... + Interrupt (ResourceConsumer, Level, ActiveHigh, Exclusive) { + 0x20, + 0x24 + } + }) + + Name (_DSD, Package () { + ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), + Package () { + Package () {"interrupt-names", + Package (2) {"default", "alert"}}, + } + ... + }) + } + +The interrupt name 'default' will correspond to 0x20 in Interrupt() +resource and 'alert' to 0x24. + +The driver can call the function - device_irq_get_byname() with the device +and interrupt name as arguments to get the corresponding IRQ number. + SPI serial bus support ======================
Added details and example for named interrupts in the ACPI table. Signed-off-by: Akhil R <akhilrajeev@nvidia.com> --- Documentation/firmware-guide/acpi/enumeration.rst | 38 +++++++++++++++++++++++ 1 file changed, 38 insertions(+)