Re: [PATCH v3 03/11] thermal: armada: Simplify the check of the validity bit

[Baruch Siach <baruch-NswTu9S1W3P6gbPvEgmw2w@public.gmane.org>]

Hi Miquel,

On Thu, Dec 14, 2017 at 11:30:03AM +0100, Miquel Raynal wrote:
> All Armada SoCs use one bit to declare if the sensor values are valid.
> This bit moves across the versions of the IP.
> 
> The method until then was to do both a shift and compare with an useless
> flag of "0x1". It is clearer and quicker to directly save the value that
> must be ANDed instead of the bit position and do a single bitwise AND
> operation.
> 
> Signed-off-by: Miquel Raynal <miquel.raynal-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
> ---
>  drivers/thermal/armada_thermal.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/thermal/armada_thermal.c b/drivers/thermal/armada_thermal.c
> index 6c4af2622d4f..26698f2d3ca7 100644
> --- a/drivers/thermal/armada_thermal.c
> +++ b/drivers/thermal/armada_thermal.c
> @@ -24,8 +24,6 @@
>  #include <linux/of_device.h>
>  #include <linux/thermal.h>
>  
> -#define THERMAL_VALID_MASK		0x1
> -
>  /* Thermal Manager Control and Status Register */
>  #define PMU_TDC0_SW_RST_MASK		(0x1 << 1)
>  #define PMU_TM_DISABLE_OFFS		0
> @@ -67,7 +65,7 @@ struct armada_thermal_data {
>  	/* Register shift and mask to access the sensor temperature */
>  	unsigned int temp_shift;
>  	unsigned int temp_mask;
> -	unsigned int is_valid_shift;
> +	unsigned int is_valid_bit;

Type should be u32 now, I think.

>  };
>  
>  static void armadaxp_init_sensor(struct platform_device *pdev,
> @@ -151,7 +149,7 @@ static bool armada_is_valid(struct armada_thermal_priv *priv)
>  {
>  	unsigned long reg = readl_relaxed(priv->sensor);

u32 here also, I think. But that's unrelated to this patch.

> -	return (reg >> priv->data->is_valid_shift) & THERMAL_VALID_MASK;
> +	return reg & priv->data->is_valid_bit;
>  }
>  
>  static int armada_get_temp(struct thermal_zone_device *thermal,
> @@ -199,7 +197,7 @@ static const struct armada_thermal_data armadaxp_data = {
>  static const struct armada_thermal_data armada370_data = {
>  	.is_valid = armada_is_valid,
>  	.init_sensor = armada370_init_sensor,
> -	.is_valid_shift = 9,
> +	.is_valid_bit = BIT(9),
>  	.temp_shift = 10,
>  	.temp_mask = 0x1ff,
>  	.coef_b = 3153000000UL,
> @@ -210,7 +208,7 @@ static const struct armada_thermal_data armada370_data = {
>  static const struct armada_thermal_data armada375_data = {
>  	.is_valid = armada_is_valid,
>  	.init_sensor = armada375_init_sensor,
> -	.is_valid_shift = 10,
> +	.is_valid_bit = BIT(10),
>  	.temp_shift = 0,
>  	.temp_mask = 0x1ff,
>  	.coef_b = 3171900000UL,
> @@ -221,7 +219,7 @@ static const struct armada_thermal_data armada375_data = {
>  static const struct armada_thermal_data armada380_data = {
>  	.is_valid = armada_is_valid,
>  	.init_sensor = armada380_init_sensor,
> -	.is_valid_shift = 10,
> +	.is_valid_bit = BIT(10),
>  	.temp_shift = 0,
>  	.temp_mask = 0x3ff,
>  	.coef_b = 1172499100UL,

baruch

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