The driver assumes that the input selection register (TIM_TISEL) is at its reset default value. Usually this is the case, but the bootloader might have modified it. Also reset the SMCR register while at it. This bases on the effectively same patch submitted by Olivier Moysan for pwm-stm32. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx> --- Hello, note that the patch by Olivier Moysan[1] for pwm-stm32 is expected to appear in Thierry's tree soon. It added the definition of TIM_TISEL in the same way, so the two patches should merge just fine. Alternatively you can commit it to a tree that already has the pwm change (and then drop the change to include/linux/mfd/stm32-timers.h from this one). Best regards Uwe [1] https://lore.kernel.org/linux-pwm/20221213102707.1096345-1-olivier.moysan@xxxxxxxxxxx drivers/counter/stm32-timer-cnt.c | 4 ++++ include/linux/mfd/stm32-timers.h | 1 + 2 files changed, 5 insertions(+) diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c index 9bf20a5d6bda..d001d77f17ac 100644 --- a/drivers/counter/stm32-timer-cnt.c +++ b/drivers/counter/stm32-timer-cnt.c @@ -342,6 +342,10 @@ static int stm32_timer_cnt_probe(struct platform_device *pdev) platform_set_drvdata(pdev, priv); + /* Reset input selector to its default input and disable slave mode */ + regmap_write(priv->regmap, TIM_TISEL, 0x0); + regmap_write(priv->regmap, TIM_SMCR, 0x0); + /* Register Counter device */ ret = devm_counter_add(dev, counter); if (ret < 0) diff --git a/include/linux/mfd/stm32-timers.h b/include/linux/mfd/stm32-timers.h index 5f5c43fd69dd..1b94325febb3 100644 --- a/include/linux/mfd/stm32-timers.h +++ b/include/linux/mfd/stm32-timers.h @@ -31,6 +31,7 @@ #define TIM_BDTR 0x44 /* Break and Dead-Time Reg */ #define TIM_DCR 0x48 /* DMA control register */ #define TIM_DMAR 0x4C /* DMA register for transfer */ +#define TIM_TISEL 0x68 /* Input Selection */ #define TIM_CR1_CEN BIT(0) /* Counter Enable */ #define TIM_CR1_DIR BIT(4) /* Counter Direction */ base-commit: fe15c26ee26efa11741a7b632e9f23b01aca4cc6 -- 2.39.2
