On Wed, Dec 20, 2023 at 03:57:22PM +0100, Fabrice Gasnier wrote:
> This is a precursor patch to support capture channels on all possible
> channels and stm32 timer types. Original driver was intended to be used
> only as quadrature encoder and simple counter on internal clock.
>
> So, add a check on encoder capability, so the driver may be probed for
> timer instances without encoder feature. This way, all timers may be used
> as simple counter on internal clock, starting from here.
>
> Encoder capability is retrieved by using the timer index (originally in
> stm32-timer-trigger driver and dt-bindings). The need to keep backward
> compatibility with existing device tree lead to parse aside trigger node.
>
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxxxxxxx>
> ---
> Changes in v3:
> - New patch split from:
> "counter: stm32-timer-cnt: populate capture channels and check encoder"
> - return -EOPNOTSUPP when encoder function isn't supported by the timer
> instance.
> ---
> drivers/counter/stm32-timer-cnt.c | 55 +++++++++++++++++++++++++++++++
> 1 file changed, 55 insertions(+)
>
> diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c
> index bf2726dd7f12..6933d42b16bf 100644
> --- a/drivers/counter/stm32-timer-cnt.c
> +++ b/drivers/counter/stm32-timer-cnt.c
> @@ -11,6 +11,7 @@
> #include <linux/mfd/stm32-timers.h>
> #include <linux/mod_devicetable.h>
> #include <linux/module.h>
> +#include <linux/of.h>
> #include <linux/pinctrl/consumer.h>
> #include <linux/platform_device.h>
> #include <linux/types.h>
> @@ -38,6 +39,8 @@ struct stm32_timer_cnt {
> u32 max_arr;
> bool enabled;
> struct stm32_timer_regs bak;
> + bool has_encoder;
> + u32 idx;
This idx value is only used temporarily to determine whether the device has
support for encoder mode. Do we really need to store it indefinitely
here?
> +static int stm32_timer_cnt_probe_encoder(struct platform_device *pdev,
This function uses 'pdev' only to access 'dev'. It'll be better to pass
a reference to 'dev' directly instead.
William Breathitt Gray
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