Lines Matching +full:rs485 +full:- +full:rx +full:- +full:during +full:- +full:tx
1 .. SPDX-License-Identifier: GPL-2.0
13 that are accessed through memory-mapped registers.
15 In order to support this and re-use the existing drivers as much as
18 - Devices that have no bus connector resource are represented as
21 - Devices behind real busses where there is a connector resource
34 This means that when ACPI_HANDLE(dev) returns non-NULL the device was
36 device-specific configuration. There is an example of this below.
43 for the device and add supported ACPI IDs. If this same IP-block is used on
44 some other non-ACPI platform, the driver might work out of the box or needs
163 to a specific FixedDMA resource. By default "tx" means the first entry of the
164 FixedDMA resource array, "rx" means the second entry. The table below shows a
181 So, the FixedDMA with request line 0x0018 is "tx" and next one is "rx" in
194 The interrupt name can be listed in _DSD as 'interrupt-names'. The names
211 ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
213 Package () { "interrupt-names", Package () { "default", "alert" } },
223 The driver can call the function - fwnode_irq_get_byname() with the fwnode
276 ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
281 Package () { "address-width", 16 },
287 APIs during ->probe() phase like::
297 err = device_property_read_u32(dev, "address-width", &addr_width);
342 ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
344 Package () { "compatible", Package () { "pwm-leds" } },
345 Package () { "label", "alarm-led" },
359 In the above example the PWM-based LED driver references to the PWM channel 0
394 ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
397 Package () { "power-gpios", Package () { ^DEV, 0, 0, 0 } },
398 Package () { "irq-gpios", Package () { ^DEV, 1, 0, 0 } },
409 Documentation/admin-guide/gpio/.
432 See Documentation/firmware-guide/acpi/gpio-properties.rst for more information
435 RS-485 support
438 ACPI _DSD (Device Specific Data) can be used to describe RS-485 capability
447 // ACPI 5.1 _DSD used for RS-485 capabilities
450 ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
453 Package () {"rs485-rts-active-low", Zero},
454 Package () {"rs485-rx-active-high", Zero},
455 Package () {"rs485-rx-during-tx", Zero},
468 - The children share the parent ACPI handle.
469 - The MFD cell can specify the ACPI id of the device.
512 6.0). For non-enumerable bus types that object must be _HID and its value must
516 existing DT-compatible device identification in ACPI and to satisfy the above
539 For example, the following ACPI sample might be used to enumerate an lm75-type
547 ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
578 Refer to Documentation/firmware-guide/acpi/DSD-properties-rules.rst for more
588 in a fixed position (ethernet, Wi-Fi, serial ports, etc.). In this conditions it
598 16 GPIOs and we want to add the property ``gpio-line-names`` [1]_ to these pins.
617 07:00.0 Serial controller: Exar Corp. XR17V3521 Dual PCIe UART (rev 03) <-- Exar
622 -[0000:00]-+-00.0
624 +-13.0-[01]----00.0
625 +-13.1-[02]----00.0
626 +-13.2-[03]--
627 +-14.0-[04]----00.0
628 +-14.1-[05-09]----00.0-[06-09]--+-01.0-[07]----00.0 <-- Exar
629 | +-02.0-[08]----00.0
630 | \-03.0-[09]--
632 \-1f.1
637 Bus: 0 - Device: 14 - Function: 1
645 acpixtract -a acpidump
646 iasl -e ssdt?.* -d dsdt.dat
692 ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
697 "gpio-line-names",
727 .. [1] Documentation/firmware-guide/acpi/gpio-properties.rst
729 .. [2] Documentation/admin-guide/acpi/initrd_table_override.rst
731 .. [3] ACPI Specifications, Version 6.3 - Paragraph 6.1.1 _ADR Address)
733 referenced 2020-11-18