Add pwm fan driver support on Tegra186 SoC.
Signed-off-by: Rajkumar Rampelli
---
V2: Removed generic-pwm-tachometer driver dt node and using pwm-fan driver
for reading fan speed.
arch/arm64/boot/dts/nvidia/tegra186.dtsi | 6 ++
1 file changed, 6 insertions(+)
diff --git a/arch/arm64
0 for FAN speed
variation
h. cat /sys/calss/hwmon/hwmon0/fan1_input
i. echo 4000 > duty_cycle
h. cat /sys/calss/hwmon/hwmon0/fan1_input
i. echo 2000 > duty_cycle
h. cat /sys/calss/hwmon/hwmon0/fan1_input
i. echo 0 > duty_cycle
h. cat /sys/calss/hwmon/hwmon0/fan1_input
Rajk
Tegra Tachometer driver implements PWM capture to measure
period. Enable this driver as a module in the ARM64 defconfig.
Signed-off-by: Rajkumar Rampelli
---
V2: No changes in this patch
arch/arm64/configs/defconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/configs
Enable pwm-fan driver to make use of a PWM interface to
read speed of a fan in rotations per minute.
Signed-off-by: Rajkumar Rampelli
---
V2: Added pwm-fan driver support as a loadable module.
Removed generic-pwm-tachometer driver support which was added as part of v1
arch/arm64/configs
Add fan device attribute fan1_input in pwm-fan driver
to read speed of fan in rotations per minute.
Signed-off-by: Rajkumar Rampelli
---
V2: Removed generic-pwm-tachometer driver and using pwm-fan driver as per
suggestions
to read fan speed.
Added fan device attribute to report speed
PWM Tachometer driver capture the PWM signal which is output of FAN
in general and provide the period of PWM signal which is converted to
RPM by SW.
Add Tegra Tachometer driver which implements the pwm-capture to
measure period.
Signed-off-by: Rajkumar Rampelli
Signed-off-by: Laxman Dewangan
(), disable(), config()
to check if they are supported by the client driver or not. Skip these
callbacks if they are not supported.
Signed-off-by: Rajkumar Rampelli
---
V2: Added if conditional checks for pwm callbacks since drivers may
implements only pwm capture functionality.
drivers/pwm
The NVIDIA Tegra186 SoC has a Tachometer Controller that analyzes the
PWM signal of a Fan and reports the period value through pwm interface.
Signed-off-by: Rajkumar Rampelli
---
V2: Renamed clock-names/reset-names dt properties values to "tachometer"
Renamed compatible propert
The NVIDIA Tegra186 SoC has a PWM controller which is
used in FAN control use case.
Signed-off-by: Rajkumar Rampelli
---
V2: no changes in this patch
arch/arm64/boot/dts/nvidia/tegra186.dtsi | 11 +++
1 file changed, 11 insertions(+)
diff --git a/arch/arm64/boot/dts/nvidia/tegra186
Supply Device tree binding documentation for the NVIDIA
Tegra186 SoC's Tachometer Controller
Signed-off-by: Rajkumar Rampelli
---
V2: Renamed compatible string to "nvidia,tegra186-pwm-tachometer"
Renamed dt property values of clock-names and reset-names to "tachom
On Wednesday 28 February 2018 07:59 PM, Guenter Roeck wrote:
On 02/27/2018 11:03 PM, Mikko Perttunen wrote:
On 02/28/2018 08:12 AM, Rajkumar Rampelli wrote:
On Wednesday 28 February 2018 11:28 AM, Guenter Roeck wrote:
On 02/27/2018 09:38 PM, Rajkumar Rampelli wrote:
On Wednesday 21
On Wednesday 28 February 2018 11:28 AM, Guenter Roeck wrote:
On 02/27/2018 09:38 PM, Rajkumar Rampelli wrote:
On Wednesday 21 February 2018 08:20 PM, Guenter Roeck wrote:
On 02/20/2018 10:58 PM, Rajkumar Rampelli wrote:
Add generic PWM based tachometer driver via HWMON interface
to report
On Wednesday 21 February 2018 08:20 PM, Guenter Roeck wrote:
On 02/20/2018 10:58 PM, Rajkumar Rampelli wrote:
Add generic PWM based tachometer driver via HWMON interface
to report the RPM of motor. This drivers get the period/duty
cycle from PWM IP which captures the motor PWM output.
This
Tegra Tachometer driver implements PWM capture to measure
period. Enable this driver as a module in the ARM64 defconfig.
Signed-off-by: Rajkumar Rampelli
---
arch/arm64/configs/defconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs
Add PWM based Tachometer support on Tegra186 to measure
number of rotations of a Fan per minute by using PWM
capture interface
Signed-off-by: Rajkumar Rampelli
---
arch/arm64/boot/dts/nvidia/tegra186.dtsi | 6 ++
1 file changed, 6 insertions(+)
diff --git a/arch/arm64/boot/dts/nvidia
The NVIDIA Tegra186 SoC has a PWM controller which is
used in FAN control use case.
Signed-off-by: Rajkumar Rampelli
---
arch/arm64/boot/dts/nvidia/tegra186.dtsi | 11 +++
1 file changed, 11 insertions(+)
diff --git a/arch/arm64/boot/dts/nvidia/tegra186.dtsi
b/arch/arm64/boot/dts
Enable Generic PWM based Tachometer driver which implements a simple
interface for monitoring the speed of a fan in roatations per minute,
and exposes it to the user space by using the hwmon's sysfs interface.
Enable this driver as a module in the ARM64 defconfig.
Signed-off-by: Rajkumar Ram
) to the user space
by using the hwmon's sysfs interface
Signed-off-by: Rajkumar Rampelli
---
Documentation/hwmon/generic-pwm-tachometer | 17 +
drivers/hwmon/Kconfig | 10 +++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/generic-pwm-tachome
The NVIDIA Tegra186 SoC has a Tachometer Controller that analyzes the
PWM signal of a Fan and reports the period value through pwm interface.
Signed-off-by: Rajkumar Rampelli
---
arch/arm64/boot/dts/nvidia/tegra186-p2771-.dts | 5 +
arch/arm64/boot/dts/nvidia/tegra186.dtsi
Add DT binding details for the PWM based generic tachometer
driver which gets the period of the PWM tach-output from Fan
via PWM IP having capability of capturing the signal.
Signed-off-by: Rajkumar Rampelli
---
.../bindings/hwmon/generic-pwm-tachometer.txt | 25 ++
1
PWM Tachometer driver capture the PWM signal which is output of FAN
in general and provide the period of PWM signal which is converted to
RPM by SW.
Add Tegra Tachometer driver which implements the pwm-capture to
measure period.
Signed-off-by: Rajkumar Rampelli
Signed-off-by: Laxman Dewangan
Supply Device tree binding documentation for the NVIDIA
Tegra186 SoC's Tachometer Controller
Signed-off-by: Rajkumar Rampelli
---
.../bindings/pwm/pwm-tegra-tachometer.txt | 31 ++
1 file changed, 31 insertions(+)
create mode 100644
Documentation/devic
Add support for pwm HW driver which has only capture functionality.
This helps to implement the PWM based Tachometer driver which reads
the PWM output signals from electronic fans.
PWM Tachometer captures the period and duty cycle of the PWM signal
Signed-off-by: Rajkumar Rampelli
---
drivers
/sys/devices/platform/generic_pwm_tachometer/hwmon/hwmon0/rpm
i. echo 0 > duty_cycle
h. cat /sys/devices/platform/generic_pwm_tachometer/hwmon/hwmon0/rpm
Rajkumar Rampelli (10):
pwm: core: Add support for PWM HW driver with pwm capture only
dt-bindings: Tegra186 tachometer device tree bindings
p
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