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Document: add PLAT_PL061_MAX_GPIOS define 

ARM PL061 GPIO driver requires the "PLAT_PL061_MAX_GPIOS" definition.
By default, it's defined to 32 in PL061 GPIO driver. If user wants
more PL061 controllers in platform, user should define the build
flag in platform.mk instead.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
This commit is contained in:
Haojian Zhuang 2016-02-03 22:35:04 +08:00
parent 0ab3f9a741
commit 7dc4b2272f
1 changed files with 12 additions and 0 deletions
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docs/porting-guide.md
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@ -466,6 +466,18 @@ memory layout implies some image overlaying like in ARM standard platforms.
Defines the maximum address that the TSP's progbits sections can occupy.
If the platform port uses the PL061 GPIO driver, the following constant may
optionally be defined:
* **PLAT_PL061_MAX_GPIOS**
Maximum number of GPIOs required by the platform. This allows control how
much memory is allocated for PL061 GPIO controllers. The default value is
32.
[For example, define the build flag in platform.mk]:
PLAT_PL061_MAX_GPIOS := 160
$(eval $(call add_define,PLAT_PL061_MAX_GPIOS))
### File : plat_macros.S [mandatory]
Each platform must ensure a file of this name is in the system include path with