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authorPhilip, Avinash <avinashphilip@ti.com>2012-11-27 14:18:06 +0530
committerThierry Reding <thierry.reding@avionic-design.de>2012-11-28 15:14:41 +0100
commitaf0ba001d208e117b5f4e4f504672b42a664a7f7 (patch)
tree448f579454bea86b34d3e980c75668e13a43a8fd /drivers/pwm/Kconfig
parent83af24027b3df1af5c5a9aa9adcdcfeb3429d3be (diff)
downloadop-kernel-dev-af0ba001d208e117b5f4e4f504672b42a664a7f7.zip
op-kernel-dev-af0ba001d208e117b5f4e4f504672b42a664a7f7.tar.gz
pwm: Add TI PWM subsystem driver
In some platforms (like am33xx), PWM sub modules (ECAP, EHRPWM, EQEP) are integrated to PWM subsystem. These PWM submodules has resources shared and only one register bit-field is provided to control module/clock enable/disable, makes it difficult to handle common resources from independent PWMSS submodule drivers. So the solution here implemented in this patch is, to create driver for PWMSS and take the role of parent driver for PWM submodules. PWMSS parent driver enumerates all the child nodes under PWMSS module. Also symbol "pwmss_submodule_state_change" exported to enable clock gating for individual PWMSS submodules, and submodule drivers has to enable clock gating from their drivers. As this is only supported during DT boot, the parent/child relationship is created and populated in DT execution flow. The only required change is inside DTS file, making EHRPWM & ECAP as a child to PWMSS node. Signed-off-by: Philip, Avinash <avinashphilip@ti.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Diffstat (limited to 'drivers/pwm/Kconfig')
-rw-r--r--drivers/pwm/Kconfig11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 6e556c7..3dcb76d 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -136,6 +136,7 @@ config PWM_TEGRA
config PWM_TIECAP
tristate "ECAP PWM support"
depends on SOC_AM33XX
+ select PWM_TIPWMSS
help
PWM driver support for the ECAP APWM controller found on AM33XX
TI SOC
@@ -146,6 +147,7 @@ config PWM_TIECAP
config PWM_TIEHRPWM
tristate "EHRPWM PWM support"
depends on SOC_AM33XX
+ select PWM_TIPWMSS
help
PWM driver support for the EHRPWM controller found on AM33XX
TI SOC
@@ -153,6 +155,15 @@ config PWM_TIEHRPWM
To compile this driver as a module, choose M here: the module
will be called pwm-tiehrpwm.
+config PWM_TIPWMSS
+ bool
+ depends on SOC_AM33XX && (PWM_TIEHRPWM || PWM_TIECAP)
+ help
+ PWM Subsystem driver support for AM33xx SOC.
+
+ PWM submodules require PWM config space access from submodule
+ drivers and require common parent driver support.
+
config PWM_TWL6030
tristate "TWL6030 PWM support"
depends on TWL4030_CORE
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