linux-kernel - Re: [PATCH 2/7] iio: inv_mpu6050: Initial regcache support

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Date:	Sun, 1 May 2016 18:12:35 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Crestez Dan Leonard <leonard.crestez@...el.com>,
	linux-iio@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Peter Meerwald-Stadler <pmeerw@...erw.net>,
	Daniel Baluta <daniel.baluta@...el.com>,
	Ge Gao <GGao@...ensense.com>
Subject: Re: [PATCH 2/7] iio: inv_mpu6050: Initial regcache support

On 29/04/16 20:02, Crestez Dan Leonard wrote:
> Signed-off-by: Crestez Dan Leonard <leonard.crestez@...el.com>
Looks fine to me.

Jonathan
> ---
>  drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 47 ++++++++++++++++++++++++++++++
>  drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c  |  5 ----
>  drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h  |  1 +
>  drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c  |  5 ----
>  4 files changed, 48 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> index b269b37..5918c23 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> @@ -116,6 +116,53 @@ static const struct inv_mpu6050_hw hw_info[] = {
>  	},
>  };
>  
> +static bool inv_mpu6050_volatile_reg(struct device *dev, unsigned int reg)
> +{
> +	if (reg >= INV_MPU6050_REG_RAW_ACCEL && reg < INV_MPU6050_REG_RAW_ACCEL + 6)
> +		return true;
> +	if (reg >= INV_MPU6050_REG_RAW_GYRO && reg < INV_MPU6050_REG_RAW_GYRO + 6)
> +		return true;
> +	switch (reg) {
> +	case INV_MPU6050_REG_TEMPERATURE:
> +	case INV_MPU6050_REG_TEMPERATURE + 1:
> +	case INV_MPU6050_REG_USER_CTRL:
> +	case INV_MPU6050_REG_PWR_MGMT_1:
> +	case INV_MPU6050_REG_FIFO_COUNT_H:
> +	case INV_MPU6050_REG_FIFO_COUNT_H + 1:
> +	case INV_MPU6050_REG_FIFO_R_W:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
> +static bool inv_mpu6050_precious_reg(struct device *dev, unsigned int reg)
> +{
> +	switch (reg) {
> +	case INV_MPU6050_REG_FIFO_R_W:
> +		return true;
> +	default:
> +		return false;
> +	}
> +}
> +
> +/*
> + * Common regmap config for inv_mpu devices
> + *
> + * The current volatile/precious registers are common among supported devices.
> + * When that changes the volatile/precious callbacks should go through the
> + * inv_mpu6050_reg_map structs.
> + */
> +const struct regmap_config inv_mpu_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +
> +	.cache_type = REGCACHE_RBTREE,
> +	.volatile_reg = inv_mpu6050_volatile_reg,
> +	.precious_reg = inv_mpu6050_precious_reg,
> +};
> +EXPORT_SYMBOL_GPL(inv_mpu_regmap_config);
> +
>  int inv_mpu6050_switch_engine(struct inv_mpu6050_state *st, bool en, u32 mask)
>  {
>  	unsigned int d, mgmt_1;
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
> index 1a424a6..1a8d1a5 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c
> @@ -20,11 +20,6 @@
>  #include <linux/module.h>
>  #include "inv_mpu_iio.h"
>  
> -static const struct regmap_config inv_mpu_regmap_config = {
> -	.reg_bits = 8,
> -	.val_bits = 8,
> -};
> -
>  /*
>   * The i2c read/write needs to happen in unlocked mode. As the parent
>   * adapter is common. If we use locked versions, it will fail as
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> index 47ca25b..297b0ef 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> @@ -291,3 +291,4 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
>  int inv_mpu_core_remove(struct device *dev);
>  int inv_mpu6050_set_power_itg(struct inv_mpu6050_state *st, bool power_on);
>  extern const struct dev_pm_ops inv_mpu_pmops;
> +extern const struct regmap_config inv_mpu_regmap_config;
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
> index 190a4a5..b3bd977 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c
> @@ -17,11 +17,6 @@
>  #include <linux/iio/iio.h>
>  #include "inv_mpu_iio.h"
>  
> -static const struct regmap_config inv_mpu_regmap_config = {
> -	.reg_bits = 8,
> -	.val_bits = 8,
> -};
> -
>  static int inv_mpu_i2c_disable(struct iio_dev *indio_dev)
>  {
>  	struct inv_mpu6050_state *st = iio_priv(indio_dev);
>