linux-toradex.git/include/linux/mfd/stm32-timers.h, branch v6.14-rc2

mfd: stm32-timers: Drop unused TIM_DIER_CC_IE

2024-06-26T15:09:58+00:00

This macro is misleading as

	TIM_DIER_CC_IE(1) == TIM_DIER_CC2IE

. The only user was updated to use TIM_DIER_CCxIE() instead which
doesn't suffer from this mismatch, so TIM_DIER_CC_IE can be dropped.

Signed-off-by: Uwe Kleine-König 
Link: https://lore.kernel.org/r/6c8fcc4ed159992a1dbb0796087e6ceb10c39c96.1718791090.git.u.kleine-koenig@baylibre.com
Signed-off-by: Lee Jones

mfd: stm32-timers: Add some register definitions with a parameter

2024-06-26T15:09:52+00:00

There are some registers that belong together and are numbered from 1 to
4. Introduce a macro definition for these that takes the channel number
as parameter and define the previously available constants using the new
ones.

This allows to simplify some users that up to now use constructs like

	TIM_CCER_CC1NE << (ch * 4)

which is an ugly mix of using a predefined value and still knowing
internal details about it.

Note that there are several decrements by 1 involved. These are
necessary because software guys start counting at 0 while the hardware
designer started at 1 (and having TIM_CCER_CCxE(1) be TIM_CCER_CC2E
isn't a sane option). The compiler is expected to optimize these out
nicely.

Signed-off-by: Uwe Kleine-König 
Link: https://lore.kernel.org/r/05df15f61dde81033407d3b4fcb67ee403ecc8db.1718791090.git.u.kleine-koenig@baylibre.com
Signed-off-by: Lee Jones

mfd: stm32-timers: Unify alignment of register definition

2024-06-26T15:08:43+00:00

Use tabs consistently for indention and properly align register names,
values and comments. This improves readability (at least for my eyes).

Signed-off-by: Uwe Kleine-König 
Link: https://lore.kernel.org/r/da3b7f9af5794d7463aa62cbaa7251abf1af2018.1718791090.git.u.kleine-koenig@baylibre.com
Signed-off-by: Lee Jones

counter: stm32-timer-cnt: add support for capture events

2024-04-02T17:10:34+00:00

Add support for capture events. Captured counter value for each channel
can be retrieved through CCRx register.
STM32 timers can have up to 4 capture channels (on input channel 1 to
channel 4), hence need to check the number of channels before reading
the capture data.
The capture configuration is hard-coded to capture signals on both edges
(non-inverted). Interrupts are used to report events independently for
each channel.

Reviewed-by: William Breathitt Gray 
Acked-by: Lee Jones 
Signed-off-by: Fabrice Gasnier 
Link: https://lore.kernel.org/r/20240307133306.383045-11-fabrice.gasnier@foss.st.com
Signed-off-by: William Breathitt Gray

mfd: stm32-timers: Add support for interrupts

2023-11-01T10:02:12+00:00

There are two types of STM32 timers that may have:

- a global interrupt line
- 4 dedicated interrupt lines.

Those interrupts are optional as defined in the dt-bindings. Enforce checks
on either one, four or no interrupts are provided with their names.
Optionally get them here, to be used by child devices.

Signed-off-by: Fabrice Gasnier 
Link: https://lore.kernel.org/r/20230829134029.2402868-5-fabrice.gasnier@foss.st.com
Signed-off-by: Lee Jones

pwm: stm32: Enforce settings for PWM capture

2023-04-06T14:35:01+00:00

The PWM capture assumes that the input selector is set to default
input and that the slave mode is disabled. Force reset state for
TISEL and SMCR registers to match this requirement.

Note that slave mode disabling is not a pre-requisite by itself
for capture mode, as hardware supports it for PWM capture.
However, the current implementation of the driver does not
allow slave mode for PWM capture. Setting slave mode for PWM
capture results in wrong capture values.

Signed-off-by: Olivier Moysan 
Acked-by: Lee Jones 
Acked-by: Uwe Kleine-König 
Signed-off-by: Thierry Reding

counter: stm32-timer-cnt: Provide defines for slave mode selection

2021-10-17T09:52:46+00:00

The STM32 timer permits configuration of the counter encoder mode via
the slave mode control register (SMCR) slave mode selection (SMS) bits.
This patch provides preprocessor defines for the supported encoder
modes.

Cc: Fabrice Gasnier 
Signed-off-by: William Breathitt Gray 
Reviewed-by: Fabrice Gasnier 
Link: https://lore.kernel.org/r/ad3d9cd7af580d586316d368f74964cbc394f981.1630031207.git.vilhelm.gray@gmail.com
Signed-off-by: Jonathan Cameron

pwm: stm32: Remove clutter from ternary operator

2019-10-21T14:50:05+00:00

Remove usage of the ternary operator to assign values for register
fields. Instead, parameterize the register and field offset macros
and pass the index to them.

This removes clutter and improves readability.

Signed-off-by: Thierry Reding

mfd: stm32-timers: Fix pwm-stm32 linker issue with COMPILE_TEST

2018-06-04T06:14:17+00:00

This is seen when COMPILE_TEST=y and MFD_STM32_TIMERS=n.
drivers/pwm/pwm-stm32.o: In function 'stm32_pwm_raw_capture':
pwm-stm32.c:... undefined reference to 'stm32_timers_dma_burst_read'
Fixes: 0c6609805b63 ("mfd: stm32-timers: Add support for DMAs")

Signed-off-by: Fabrice Gasnier 
Reported-by: Randy Dunlap 
Tested-by: Randy Dunlap 

Signed-off-by: Lee Jones

pwm: stm32: Use input prescaler to improve period capture

2018-05-16T08:11:19+00:00

Using input prescaler, capture unit will trigger DMA once every
configurable /2, /4 or /8 events (rising edge). This helps improve
period (only) capture accuracy at high rates.

Signed-off-by: Fabrice Gasnier 
Reviewed-by: Benjamin Gaignard 
Acked-by: Thierry Reding 
Signed-off-by: Lee Jones