diff options
| author | Haojian Zhuang <haojian.zhuang@linaro.org> | 2016-02-03 22:35:04 +0800 |
|---|---|---|
| committer | Haojian Zhuang <haojian.zhuang@linaro.org> | 2016-02-12 23:21:37 +0800 |
| commit | 7dc4b2272f031924cd47c0a8fe36679f1a396a65 (patch) | |
| tree | 9a8ac3ad2f457779eaeb3e05da24d9472f91469d /docs | |
| parent | 0ab3f9a741afcded4ddd4cf4da8a2bd2d5da8551 (diff) | |
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>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/porting-guide.md | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/docs/porting-guide.md b/docs/porting-guide.md index bdbdbc22..89d8251e 100644 --- a/docs/porting-guide.md +++ b/docs/porting-guide.md @@ -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 |