[RFC PATCH 0/2] extend PWM framework to support PWM modes
Hi all, Please give feedback on these patches which extends the PWM framework in order to support multiple PWM signal types. The current patch series recognize the following PWM signal types: - PWM complementary signals - PWM push-pull signal These output signals could be configured by setting PWM mode (a new input in sysfs has been added in order to support this operation). root@sama5d2-xplained:/sys/devices/platform/ahb/ahb:apb/f802c000.pwm/pwm/pwmchip0/pwm2# ls -l -r--r--r--1 root root 4096 Feb 9 10:54 capture -rw-r--r--1 root root 4096 Feb 9 10:54 duty_cycle -rw-r--r--1 root root 4096 Feb 9 10:54 enable -rw-r--r--1 root root 4096 Feb 9 10:54 mode -rw-r--r--1 root root 4096 Feb 9 10:54 period -rw-r--r--1 root root 4096 Feb 9 10:55 polarity drwxr-xr-x2 root root 0 Feb 9 10:54 power -rw-r--r--1 root root 4096 Feb 9 10:54 uevent Definition of PWM complementary mode: For a PWM controllers with more than one outputs per PWM channel, e.g. with 2 outputs per PWM channels, the PWM complementary signals have opposite levels, same duration and same starting times, as in the following diagram: ________ PWMH __| |__| |__| |__| |__ __________ PWML |__| |__| |__| |__| <--T--> Where T is the signal period. Definition of PWM push-pull mode: For PWM controllers with more than one outputs per PWM channel, e.g. with 2 outputs per PWM channel, the PWM push-pull signals have same levels, same duration and are delayed until the begining of the next period, as in the following diagram: __ __ PWMH __| || | __ __ PWML | || |__ <--T--> Where T is the signal period. The PWM push-pull mode could be usefull in applications like half bridge converters. This series add support for PWM modes on atmel SAMA5D2 SoC. Please consider that this series was build on top following patch series: [PATCH v3 0/2] switch to atomic PWM [PATCH v3 1/2] drivers: pwm: pwm-atmel: switch to atomic PWM [PATCH v3 2/2] drivers: pwm: pwm-atmel: enable PWM on sama5d2 This patch series is not dependent on the other patch series I've made for extending PWM framework with PWM dead-times: [RFC PATCH 0/2] extends PWM framework to support PWM dead-times [RFC PATCH 1/2] drivers: pwm: core: implement pwm dead-times [RFC PATCH 2/2] drivers: pwm: pwm-atmel: implement pwm dead-time but, if you consider relevant, and both patch changes are considered relevant for PWM subsistem, I can combine both of them, if any. Thanks you, Claudiu Beznea Claudiu Beznea (2): drivers: pwm: core: implement pwm mode drivers: pwm: pwm-atmel: add support for pwm modes drivers/pwm/core.c| 13 +- drivers/pwm/pwm-atmel.c | 94 +-- drivers/pwm/sysfs.c | 52 include/dt-bindings/pwm/pwm.h | 1 + include/linux/pwm.h | 37 - 5 files changed, 162 insertions(+), 35 deletions(-) -- 2.7.4
[RFC PATCH 0/2] extend PWM framework to support PWM modes
Hi all, Please give feedback on these patches which extends the PWM framework in order to support multiple PWM signal types. The current patch series recognize the following PWM signal types: - PWM complementary signals - PWM push-pull signal These output signals could be configured by setting PWM mode (a new input in sysfs has been added in order to support this operation). root@sama5d2-xplained:/sys/devices/platform/ahb/ahb:apb/f802c000.pwm/pwm/pwmchip0/pwm2# ls -l -r--r--r--1 root root 4096 Feb 9 10:54 capture -rw-r--r--1 root root 4096 Feb 9 10:54 duty_cycle -rw-r--r--1 root root 4096 Feb 9 10:54 enable -rw-r--r--1 root root 4096 Feb 9 10:54 mode -rw-r--r--1 root root 4096 Feb 9 10:54 period -rw-r--r--1 root root 4096 Feb 9 10:55 polarity drwxr-xr-x2 root root 0 Feb 9 10:54 power -rw-r--r--1 root root 4096 Feb 9 10:54 uevent Definition of PWM complementary mode: For a PWM controllers with more than one outputs per PWM channel, e.g. with 2 outputs per PWM channels, the PWM complementary signals have opposite levels, same duration and same starting times, as in the following diagram: ________ PWMH __| |__| |__| |__| |__ __________ PWML |__| |__| |__| |__| <--T--> Where T is the signal period. Definition of PWM push-pull mode: For PWM controllers with more than one outputs per PWM channel, e.g. with 2 outputs per PWM channel, the PWM push-pull signals have same levels, same duration and are delayed until the begining of the next period, as in the following diagram: __ __ PWMH __| || | __ __ PWML | || |__ <--T--> Where T is the signal period. The PWM push-pull mode could be usefull in applications like half bridge converters. This series add support for PWM modes on atmel SAMA5D2 SoC. Please consider that this series was build on top following patch series: [PATCH v3 0/2] switch to atomic PWM [PATCH v3 1/2] drivers: pwm: pwm-atmel: switch to atomic PWM [PATCH v3 2/2] drivers: pwm: pwm-atmel: enable PWM on sama5d2 This patch series is not dependent on the other patch series I've made for extending PWM framework with PWM dead-times: [RFC PATCH 0/2] extends PWM framework to support PWM dead-times [RFC PATCH 1/2] drivers: pwm: core: implement pwm dead-times [RFC PATCH 2/2] drivers: pwm: pwm-atmel: implement pwm dead-time but, if you consider relevant, and both patch changes are considered relevant for PWM subsistem, I can combine both of them, if any. Thanks you, Claudiu Beznea Claudiu Beznea (2): drivers: pwm: core: implement pwm mode drivers: pwm: pwm-atmel: add support for pwm modes drivers/pwm/core.c| 13 +- drivers/pwm/pwm-atmel.c | 94 +-- drivers/pwm/sysfs.c | 52 include/dt-bindings/pwm/pwm.h | 1 + include/linux/pwm.h | 37 - 5 files changed, 162 insertions(+), 35 deletions(-) -- 2.7.4
