linux-kernel - Re: [PATCH v16 02/14] counter: stm32-timer-cnt: Provide defines for slave mode selection

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ad245fd3-5751-08e6-3f3a-30522822f0af@foss.st.com>
Date:   Tue, 31 Aug 2021 15:40:37 +0200
From:   Fabrice Gasnier <fabrice.gasnier@...s.st.com>
To:     William Breathitt Gray <vilhelm.gray@...il.com>, <jic23@...nel.org>
CC:     <linux-stm32@...md-mailman.stormreply.com>,
        <kernel@...gutronix.de>, <a.fatoum@...gutronix.de>,
        <kamel.bouhara@...tlin.com>, <gwendal@...omium.org>,
        <alexandre.belloni@...tlin.com>, <david@...hnology.com>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <syednwaris@...il.com>,
        <patrick.havelange@...ensium.com>, <fabrice.gasnier@...com>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>,
        <o.rempel@...gutronix.de>, <jarkko.nikula@...ux.intel.com>
Subject: Re: [PATCH v16 02/14] counter: stm32-timer-cnt: Provide defines for
 slave mode selection

On 8/27/21 5:47 AM, William Breathitt Gray wrote:
> 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 <fabrice.gasnier@...s.st.com>
> Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
> ---
>  drivers/counter/stm32-timer-cnt.c | 16 ++++++++--------
>  include/linux/mfd/stm32-timers.h  |  4 ++++
>  2 files changed, 12 insertions(+), 8 deletions(-)

Hi William,

You can add my:
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@...s.st.com>

Thanks,
Fabrice

> 
> diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c
> index 3fb0debd7425..1fbc46f4ee66 100644
> --- a/drivers/counter/stm32-timer-cnt.c
> +++ b/drivers/counter/stm32-timer-cnt.c
> @@ -93,16 +93,16 @@ static int stm32_count_function_get(struct counter_device *counter,
>  	regmap_read(priv->regmap, TIM_SMCR, &smcr);
>  
>  	switch (smcr & TIM_SMCR_SMS) {
> -	case 0:
> +	case TIM_SMCR_SMS_SLAVE_MODE_DISABLED:
>  		*function = STM32_COUNT_SLAVE_MODE_DISABLED;
>  		return 0;
> -	case 1:
> +	case TIM_SMCR_SMS_ENCODER_MODE_1:
>  		*function = STM32_COUNT_ENCODER_MODE_1;
>  		return 0;
> -	case 2:
> +	case TIM_SMCR_SMS_ENCODER_MODE_2:
>  		*function = STM32_COUNT_ENCODER_MODE_2;
>  		return 0;
> -	case 3:
> +	case TIM_SMCR_SMS_ENCODER_MODE_3:
>  		*function = STM32_COUNT_ENCODER_MODE_3;
>  		return 0;
>  	default:
> @@ -119,16 +119,16 @@ static int stm32_count_function_set(struct counter_device *counter,
>  
>  	switch (function) {
>  	case STM32_COUNT_SLAVE_MODE_DISABLED:
> -		sms = 0;
> +		sms = TIM_SMCR_SMS_SLAVE_MODE_DISABLED;
>  		break;
>  	case STM32_COUNT_ENCODER_MODE_1:
> -		sms = 1;
> +		sms = TIM_SMCR_SMS_ENCODER_MODE_1;
>  		break;
>  	case STM32_COUNT_ENCODER_MODE_2:
> -		sms = 2;
> +		sms = TIM_SMCR_SMS_ENCODER_MODE_2;
>  		break;
>  	case STM32_COUNT_ENCODER_MODE_3:
> -		sms = 3;
> +		sms = TIM_SMCR_SMS_ENCODER_MODE_3;
>  		break;
>  	default:
>  		return -EINVAL;
> diff --git a/include/linux/mfd/stm32-timers.h b/include/linux/mfd/stm32-timers.h
> index f8db83aedb2b..5f5c43fd69dd 100644
> --- a/include/linux/mfd/stm32-timers.h
> +++ b/include/linux/mfd/stm32-timers.h
> @@ -82,6 +82,10 @@
>  #define MAX_TIM_ICPSC		0x3
>  #define TIM_CR2_MMS_SHIFT	4
>  #define TIM_CR2_MMS2_SHIFT	20
> +#define TIM_SMCR_SMS_SLAVE_MODE_DISABLED	0 /* counts on internal clock when CEN=1 */
> +#define TIM_SMCR_SMS_ENCODER_MODE_1		1 /* counts TI1FP1 edges, depending on TI2FP2 level */
> +#define TIM_SMCR_SMS_ENCODER_MODE_2		2 /* counts TI2FP2 edges, depending on TI1FP1 level */
> +#define TIM_SMCR_SMS_ENCODER_MODE_3		3 /* counts on both TI1FP1 and TI2FP2 edges */
>  #define TIM_SMCR_TS_SHIFT	4
>  #define TIM_BDTR_BKF_MASK	0xF
>  #define TIM_BDTR_BKF_SHIFT(x)	(16 + (x) * 4)
>