TWxSoftware/twx-linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge tag 'gpio-v5.4-updates-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into devel

Browse Source 
gpio: updates for v5.4

- use a helper variable for &pdev->dev in gpio-em
- tweak the ifdefs in GPIO headers
- fix function links in HTML docs
- remove an unneeded error message from ixp4xx
- use the optional clk_get in gpio-mxc instead of checking the return value
- a couple improvements in pca953x
- allow to build gpio-lpc32xx on non-lpc32xx targets
This commit is contained in:
Linus Walleij
2019-09-03 16:04:19 +02:00
parent f6a7053ddc f2ee73147a
commit 8a6abcd04e
10 changed files with 147 additions and 143 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Documentation/driver-api/gpio/driver.rst
+8 -8
View File
@@ -69,9 +69,9 @@ driver code:
The code implementing a gpio_chip should support multiple instances of the
controller, preferably using the driver model. That code will configure each
gpio_chip and issue ``gpiochip_add[_data]()`` or ``devm_gpiochip_add_data()``.
Removing a GPIO controller should be rare; use ``[devm_]gpiochip_remove()``
when it is unavoidable.
gpio_chip and issue gpiochip_add(), gpiochip_add_data(), or
devm_gpiochip_add_data(). Removing a GPIO controller should be rare; use
gpiochip_remove() when it is unavoidable.
Often a gpio_chip is part of an instance-specific structure with states not
exposed by the GPIO interfaces, such as addressing, power management, and more.
@@ -512,11 +512,11 @@ available but we try to move away from this:
If there is a need to exclude certain GPIO lines from the IRQ domain handled by
these helpers, we can set .irq.need_valid_mask of the gpiochip before
``[devm_]gpiochip_add_data()`` is called. This allocates an .irq.valid_mask with as
many bits set as there are GPIO lines in the chip, each bit representing line
0..n-1. Drivers can exclude GPIO lines by clearing bits from this mask. The mask
must be filled in before gpiochip_irqchip_add() or gpiochip_irqchip_add_nested()
is called.
devm_gpiochip_add_data() or gpiochip_add_data() is called. This allocates an
.irq.valid_mask with as many bits set as there are GPIO lines in the chip, each
bit representing line 0..n-1. Drivers can exclude GPIO lines by clearing bits
from this mask. The mask must be filled in before gpiochip_irqchip_add() or
gpiochip_irqchip_add_nested() is called.
To use the helpers please keep the following in mind: