linux-kernel - Re: [PATCH v3 08/10] counter: stm32-timer-cnt: probe number of channels from registers

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Message-ID: <ZZwwHBS224JXn2Hf@ubuntu-server-vm-macos>
Date: Mon, 8 Jan 2024 17:25:48 +0000
From: William Breathitt Gray <william.gray@...aro.org>
To: Fabrice Gasnier <fabrice.gasnier@...s.st.com>
Cc: lee@...nel.org, alexandre.torgue@...s.st.com, linux-iio@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 08/10] counter: stm32-timer-cnt: probe number of
 channels from registers

On Wed, Dec 20, 2023 at 03:57:24PM +0100, Fabrice Gasnier wrote:
> Probe the number of capture compare channels, by writing CCER register bits
> and read them back. Take care to restore the register original value.
> 
> This is a precursor patch to support capture channels.
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...s.st.com>
> ---
> Changes in v3:
> - New patch split from:
>   "counter: stm32-timer-cnt: populate capture channels and check encoder"
> ---
>  drivers/counter/stm32-timer-cnt.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c
> index 55eb6af34750..b5dc4378fecf 100644
> --- a/drivers/counter/stm32-timer-cnt.c
> +++ b/drivers/counter/stm32-timer-cnt.c
> @@ -43,6 +43,7 @@ struct stm32_timer_cnt {
>  	struct stm32_timer_regs bak;
>  	bool has_encoder;
>  	u32 idx;
> +	unsigned int nchannels;
>  };
>  
>  static const enum counter_function stm32_count_functions[] = {
> @@ -417,6 +418,20 @@ static struct counter_count stm32_counts = {
>  	.num_ext = ARRAY_SIZE(stm32_count_ext)
>  };
>  
> +static void stm32_timer_cnt_detect_channels(struct platform_device *pdev,

Like stm32_timer_cnt_probe_encoder() in one of the previous patches,
this function uses 'pdev' only to access 'dev'. Pass a reference to
'dev' directly instead.

William Breathitt Gray

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