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Documentation: firmware-guide: gpio-properties: Add note to SPI CS case
authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Sat, 24 Apr 2021 14:39:35 +0000 (17:39 +0300)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Wed, 28 Apr 2021 17:11:13 +0000 (19:11 +0200)
commitec3576eac11d66a388b6cba6a7cfb3b45039a712
tree721b03b962d00a18157f1d53f974bc732a490505tree | snapshot
parentd8f9176b4ece17e831306072678cd9ae49688cf5commit | diff
Documentation: firmware-guide: gpio-properties: Add note to SPI CS case

Historically ACPI has no means of the GPIO polarity and thus
the SPISerialBus() resource defines it on the per-chip basis.
In order to avoid an ambiguity, the GPIO polarity is considered
being always Active High.

Add note about this to the respective documentation file.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Documentation/firmware-guide/acpi/gpio-properties.rst diff | blob | history
Domain: System / Kernel;