linux-kernel - Re: [PATCH v3 2/9] drivers: thermal: tsens: Pass around struct tsens

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Date:   Thu, 2 Jan 2020 11:16:42 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Amit Kucheria <amit.kucheria@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        swboyd@...omium.org, sivaa@...eaurora.org,
        Andy Gross <agross@...nel.org>,
        Amit Kucheria <amit.kucheria@...durent.com>,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 2/9] drivers: thermal: tsens: Pass around struct
 tsens_sensor as a constant

On Thu 02 Jan 06:54 PST 2020, Amit Kucheria wrote:

> All the sensor data is initialised at init time. Lock it down by passing
> it to functions as a constant.
> 

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> Signed-off-by: Amit Kucheria <amit.kucheria@...aro.org>
> ---
>  drivers/thermal/qcom/tsens-8960.c   |  2 +-
>  drivers/thermal/qcom/tsens-common.c | 14 +++++++-------
>  drivers/thermal/qcom/tsens.h        |  6 +++---
>  3 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/thermal/qcom/tsens-8960.c b/drivers/thermal/qcom/tsens-8960.c
> index a383a57cfbbc..2a28a5af209e 100644
> --- a/drivers/thermal/qcom/tsens-8960.c
> +++ b/drivers/thermal/qcom/tsens-8960.c
> @@ -245,7 +245,7 @@ static inline int code_to_mdegC(u32 adc_code, const struct tsens_sensor *s)
>  	return adc_code * slope + offset;
>  }
>  
> -static int get_temp_8960(struct tsens_sensor *s, int *temp)
> +static int get_temp_8960(const struct tsens_sensor *s, int *temp)
>  {
>  	int ret;
>  	u32 code, trdy;
> diff --git a/drivers/thermal/qcom/tsens-common.c b/drivers/thermal/qcom/tsens-common.c
> index c8d57ee0a5bb..c2df30a08b9e 100644
> --- a/drivers/thermal/qcom/tsens-common.c
> +++ b/drivers/thermal/qcom/tsens-common.c
> @@ -128,7 +128,7 @@ static inline int code_to_degc(u32 adc_code, const struct tsens_sensor *s)
>   * Return: Temperature in milliCelsius on success, a negative errno will
>   * be returned in error cases
>   */
> -static int tsens_hw_to_mC(struct tsens_sensor *s, int field)
> +static int tsens_hw_to_mC(const struct tsens_sensor *s, int field)
>  {
>  	struct tsens_priv *priv = s->priv;
>  	u32 resolution;
> @@ -160,7 +160,7 @@ static int tsens_hw_to_mC(struct tsens_sensor *s, int field)
>   *
>   * Return: ADC code or temperature in deciCelsius.
>   */
> -static int tsens_mC_to_hw(struct tsens_sensor *s, int temp)
> +static int tsens_mC_to_hw(const struct tsens_sensor *s, int temp)
>  {
>  	struct tsens_priv *priv = s->priv;
>  
> @@ -275,7 +275,7 @@ static int tsens_threshold_violated(struct tsens_priv *priv, u32 hw_id,
>  }
>  
>  static int tsens_read_irq_state(struct tsens_priv *priv, u32 hw_id,
> -				struct tsens_sensor *s, struct tsens_irq_data *d)
> +				const struct tsens_sensor *s, struct tsens_irq_data *d)
>  {
>  	int ret;
>  
> @@ -346,10 +346,10 @@ irqreturn_t tsens_irq_thread(int irq, void *data)
>  
>  	for (i = 0; i < priv->num_sensors; i++) {
>  		bool trigger = false;
> -		struct tsens_sensor *s = &priv->sensor[i];
> +		const struct tsens_sensor *s = &priv->sensor[i];
>  		u32 hw_id = s->hw_id;
>  
> -		if (IS_ERR(priv->sensor[i].tzd))
> +		if (IS_ERR(s->tzd))
>  			continue;
>  		if (!tsens_threshold_violated(priv, hw_id, &d))
>  			continue;
> @@ -457,7 +457,7 @@ void tsens_disable_irq(struct tsens_priv *priv)
>  	regmap_field_write(priv->rf[INT_EN], 0);
>  }
>  
> -int get_temp_tsens_valid(struct tsens_sensor *s, int *temp)
> +int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp)
>  {
>  	struct tsens_priv *priv = s->priv;
>  	int hw_id = s->hw_id;
> @@ -486,7 +486,7 @@ int get_temp_tsens_valid(struct tsens_sensor *s, int *temp)
>  	return 0;
>  }
>  
> -int get_temp_common(struct tsens_sensor *s, int *temp)
> +int get_temp_common(const struct tsens_sensor *s, int *temp)
>  {
>  	struct tsens_priv *priv = s->priv;
>  	int hw_id = s->hw_id;
> diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h
> index be364bf1d5a6..70dc34c80537 100644
> --- a/drivers/thermal/qcom/tsens.h
> +++ b/drivers/thermal/qcom/tsens.h
> @@ -67,7 +67,7 @@ struct tsens_ops {
>  	/* mandatory callbacks */
>  	int (*init)(struct tsens_priv *priv);
>  	int (*calibrate)(struct tsens_priv *priv);
> -	int (*get_temp)(struct tsens_sensor *s, int *temp);
> +	int (*get_temp)(const struct tsens_sensor *s, int *temp);
>  	/* optional callbacks */
>  	int (*enable)(struct tsens_priv *priv, int i);
>  	void (*disable)(struct tsens_priv *priv);
> @@ -494,8 +494,8 @@ struct tsens_priv {
>  char *qfprom_read(struct device *dev, const char *cname);
>  void compute_intercept_slope(struct tsens_priv *priv, u32 *pt1, u32 *pt2, u32 mode);
>  int init_common(struct tsens_priv *priv);
> -int get_temp_tsens_valid(struct tsens_sensor *s, int *temp);
> -int get_temp_common(struct tsens_sensor *s, int *temp);
> +int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp);
> +int get_temp_common(const struct tsens_sensor *s, int *temp);
>  int tsens_enable_irq(struct tsens_priv *priv);
>  void tsens_disable_irq(struct tsens_priv *priv);
>  int tsens_set_trips(void *_sensor, int low, int high);
> -- 
> 2.20.1
>