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Date: Mon, 8 Apr 2013 08:52:16 +0100
From: Lee Jones <lee.jones@...aro.org>
To: Axel Lin <axel.lin@...ics.com>
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Bengt Jonsson <bengt.g.jonsson@...ricsson.com>,
Yvan FILLION <yvan.fillion@...ricsson.com>,
Liam Girdwood <lgirdwood@...il.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] regulator: ab8500: Get rid of is_enabled from struct
ab8500_regulator_info
On Sun, 07 Apr 2013, Axel Lin wrote:
> The intention of this patch is to simplify the code.
>
> Maintain the is_enabled flag is not trivial, it not only needs to set/clear the
> flag in disable()/enable() but also needs to set the flag in is_enable() to get
> initial status. The only benefit of keeping is_enabled flag is just save a
> register read when set_mode(). Remove is_enabled flag makes the code simpler.
>
> This patch also moves ab8500_regulator_is_enabled() close to
> ab8500_regulator_[en|dis]able functions.
> This is required to avoid a forward declaration because now we call
> ab8500_regulator_is_enabled() in ab8500_regulator_set_mode().
> This change also makes the code better in readability by moving similar
> functions to one place.
>
> Signed-off-by: Axel Lin <axel.lin@...ics.com>
Code looks good to me:
Acked-by: Lee Jones <lee.jones@...aro.org>
> ---
> drivers/regulator/ab8500.c | 72 ++++++++++++++++++++------------------------
> 1 file changed, 32 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/regulator/ab8500.c b/drivers/regulator/ab8500.c
> index 517305e..9ebd131 100644
> --- a/drivers/regulator/ab8500.c
> +++ b/drivers/regulator/ab8500.c
> @@ -46,7 +46,6 @@ struct ab8500_shared_mode {
> * @desc: regulator description
> * @regulator_dev: regulator device
> * @shared_mode: used when mode is shared between two regulators
> - * @is_enabled: status of regulator (on/off)
> * @load_lp_uA: maximum load in idle (low power) mode
> * @update_bank: bank to control on/off
> * @update_reg: register to control on/off
> @@ -69,7 +68,6 @@ struct ab8500_regulator_info {
> struct regulator_desc desc;
> struct regulator_dev *regulator;
> struct ab8500_shared_mode *shared_mode;
> - bool is_enabled;
> int load_lp_uA;
> u8 update_bank;
> u8 update_reg;
> @@ -259,8 +257,6 @@ static int ab8500_regulator_enable(struct regulator_dev *rdev)
> return ret;
> }
>
> - info->is_enabled = true;
> -
> dev_vdbg(rdev_get_dev(rdev),
> "%s-enable (bank, reg, mask, value): 0x%x, 0x%x, 0x%x, 0x%x\n",
> info->desc.name, info->update_bank, info->update_reg,
> @@ -288,8 +284,6 @@ static int ab8500_regulator_disable(struct regulator_dev *rdev)
> return ret;
> }
>
> - info->is_enabled = false;
> -
> dev_vdbg(rdev_get_dev(rdev),
> "%s-disable (bank, reg, mask, value): 0x%x, 0x%x, 0x%x, 0x%x\n",
> info->desc.name, info->update_bank, info->update_reg,
> @@ -298,6 +292,37 @@ static int ab8500_regulator_disable(struct regulator_dev *rdev)
> return ret;
> }
>
> +static int ab8500_regulator_is_enabled(struct regulator_dev *rdev)
> +{
> + int ret;
> + struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
> + u8 regval;
> +
> + if (info == NULL) {
> + dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
> + return -EINVAL;
> + }
> +
> + ret = abx500_get_register_interruptible(info->dev,
> + info->update_bank, info->update_reg, ®val);
> + if (ret < 0) {
> + dev_err(rdev_get_dev(rdev),
> + "couldn't read 0x%x register\n", info->update_reg);
> + return ret;
> + }
> +
> + dev_vdbg(rdev_get_dev(rdev),
> + "%s-is_enabled (bank, reg, mask, value): 0x%x, 0x%x, 0x%x,"
> + " 0x%x\n",
> + info->desc.name, info->update_bank, info->update_reg,
> + info->update_mask, regval);
> +
> + if (regval & info->update_mask)
> + return 1;
> + else
> + return 0;
> +}
> +
> static unsigned int ab8500_regulator_get_optimum_mode(
> struct regulator_dev *rdev, int input_uV,
> int output_uV, int load_uA)
> @@ -398,7 +423,7 @@ static int ab8500_regulator_set_mode(struct regulator_dev *rdev,
> mask = info->update_mask;
> }
>
> - if (info->is_enabled || dmr) {
> + if (dmr || ab8500_regulator_is_enabled(rdev)) {
> ret = abx500_mask_and_set_register_interruptible(info->dev,
> bank, reg, mask, val);
> if (ret < 0)
> @@ -464,39 +489,6 @@ static unsigned int ab8500_regulator_get_mode(struct regulator_dev *rdev)
> return ret;
> }
>
> -static int ab8500_regulator_is_enabled(struct regulator_dev *rdev)
> -{
> - int ret;
> - struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
> - u8 regval;
> -
> - if (info == NULL) {
> - dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
> - return -EINVAL;
> - }
> -
> - ret = abx500_get_register_interruptible(info->dev,
> - info->update_bank, info->update_reg, ®val);
> - if (ret < 0) {
> - dev_err(rdev_get_dev(rdev),
> - "couldn't read 0x%x register\n", info->update_reg);
> - return ret;
> - }
> -
> - dev_vdbg(rdev_get_dev(rdev),
> - "%s-is_enabled (bank, reg, mask, value): 0x%x, 0x%x, 0x%x,"
> - " 0x%x\n",
> - info->desc.name, info->update_bank, info->update_reg,
> - info->update_mask, regval);
> -
> - if (regval & info->update_mask)
> - info->is_enabled = true;
> - else
> - info->is_enabled = false;
> -
> - return info->is_enabled;
> -}
> -
> static int ab8500_regulator_get_voltage_sel(struct regulator_dev *rdev)
> {
> int ret, val;
--
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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