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path: root/drivers/mfd/stm32-timers.c
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2021-04-14mfd: stm32-timers: Avoid clearing auto reload registerFabrice Gasnier1-1/+6
The ARR register is cleared unconditionally upon probing, after the maximum value has been read. This initial condition is rather not intuitive, when considering the counter child driver. It rather expects the maximum value by default: - The counter interface shows a zero value by default for 'ceiling' attribute. - Enabling the counter without any prior configuration makes it doesn't count. The reset value of ARR register is the maximum. So Choice here is to backup it, and restore it then, instead of clearing its value. It also fixes the initial condition seen by the counter driver. Fixes: d0f949e220fd ("mfd: Add STM32 Timers driver") Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
2020-05-26mfd: stm32-timers: Use dma_request_chan() instead dma_request_slave_channel()Peter Ujfalusi1-9/+23
dma_request_slave_channel() is a wrapper on top of dma_request_chan() eating up the error code. By using dma_request_chan() directly the driver can support deferred probing against DMA. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Fabrice Gasnier <fabrice.gasnier@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
2018-05-16mfd: stm32-timers: Add support for DMAsFabrice Gasnier1-2/+199
STM32 Timers can support up to 7 DMA requests: - 4 channels, update, compare and trigger. Optionally request part, or all DMAs from stm32-timers MFD core. Also add routine to implement burst reads using DMA from timer registers. This is exported. So, it can be used by child drivers, PWM capture for instance (but not limited to). Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com> Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
2018-01-08mfd: stm32: Adopt SPDX identifierBenjamin Gaignard1-3/+1
Add SPDX identifier Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> Acked-by: Philippe Ombredanne <pombredanne@nexb.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
2017-07-06mfd: stm32-timers: Use devm_of_platform_populate()Benjamin Gaignard1-9/+1
Use devm_of_platform_populate() instead of of_platform_populate() and suppress stm32_timers_remove() which become useless. Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
2017-04-27mfd: stm32-timers: Fix max registerFabrice Gasnier1-1/+1
STM32 timers register bank size is 0x400. Fix regmap max_register. Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com> Acked-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
2017-04-27mfd: stm32-timers: Fix driver removalFabrice Gasnier1-0/+8
Add missing of_platform_depopulate() upon driver removal. Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
2017-01-23mfd: Add STM32 Timers driverBenjamin Gaignard1-0/+80
This hardware block could at used at same time for PWM generation and IIO timers. PWM and IIO timer configuration are mixed in the same registers so we need a multi fonction driver to be able to share those registers. version 7: - rebase on v4.10-rc2 version 6: - rename files to stm32-timers - rename functions to stm32_timers_xxx version 5: - fix Lee comments about detect function - add missing dependency on REGMAP_MMIO version 4: - add a function to detect Auto Reload Register (ARR) size - rename the structure shared with other drivers version 2: - rename driver "stm32-gptimer" to be align with SoC documentation - only keep one compatible - use of_platform_populate() instead of devm_mfd_add_devices() Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>