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Message-ID: <BANLkTinrcQ-DRN-s+0sbJQ2=KRMtu+=hUg@mail.gmail.com>
Date: Mon, 16 May 2011 14:38:15 +0530
From: "T Krishnamoorthy, Balaji" <balajitk@...com>
To: Graeme Gregory <gg@...mlogic.co.uk>
Cc: linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
sameo@...ux.intel.com, balbi@...com, lrg@...mlogic.co.uk,
broonie@...nsource.wolfsonmicro.com
Subject: Re: [PATCH v2 3/4] REGULATOR: TWL6025: add support to twl-regulator
On Thu, May 12, 2011 at 6:57 PM, Graeme Gregory <gg@...mlogic.co.uk> wrote:
> Adding support for the twl6025. Major difference in the twl6025 is the
> group functionality has been removed from the chip so this affects how
> regulators are enabled and disabled.
>
> The names of the regulators also changed.
>
> The DCDCs of the 6025 are software controllable as well.
>
> Since V1
>
> Use the features variable passed via platform data instead of calling
> global function.
>
> Change the very switch like if statements to be a more readable
> switch statement.
>
> Signed-off-by: Graeme Gregory <gg@...mlogic.co.uk>
> ---
> drivers/regulator/twl-regulator.c | 414 +++++++++++++++++++++++++++++++++---
> 1 files changed, 379 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/regulator/twl-regulator.c b/drivers/regulator/twl-regulator.c
> index 2a808c2..51f28cc 100644
> --- a/drivers/regulator/twl-regulator.c
> +++ b/drivers/regulator/twl-regulator.c
> @@ -51,8 +51,13 @@ struct twlreg_info {
> u16 min_mV;
> u16 max_mV;
>
> + u8 flags;
> +
> /* used by regulator core */
> struct regulator_desc desc;
> +
> + /* chip specific features */
> + unsigned long features;
> };
>
>
> @@ -70,6 +75,7 @@ struct twlreg_info {
> #define VREG_TRANS 1
> #define VREG_STATE 2
> #define VREG_VOLTAGE 3
> +#define VREG_VOLTAGE_DCDC 4
> /* TWL6030 Misc register offsets */
> #define VREG_BC_ALL 1
> #define VREG_BC_REF 2
> @@ -87,6 +93,17 @@ struct twlreg_info {
> #define TWL6030_CFG_STATE_APP(v) (((v) & TWL6030_CFG_STATE_APP_MASK) >>\
> TWL6030_CFG_STATE_APP_SHIFT)
>
> +/* Flags for DCDC Voltage reading */
> +#define DCDC_OFFSET_EN BIT(0)
> +#define DCDC_EXTENDED_EN BIT(1)
> +
> +/* twl6025 SMPS EPROM values */
> +#define TWL6030_SMPS_OFFSET 0xB0
> +#define TWL6030_SMPS_MULT 0xB3
> +#define SMPS_MULTOFFSET_SMPS4 BIT(0)
> +#define SMPS_MULTOFFSET_VIO BIT(1)
> +#define SMPS_MULTOFFSET_SMPS3 BIT(6)
> +
> static inline int
> twlreg_read(struct twlreg_info *info, unsigned slave_subgp, unsigned offset)
> {
> @@ -144,11 +161,15 @@ static int twl6030reg_is_enabled(struct regulator_dev *rdev)
> struct twlreg_info *info = rdev_get_drvdata(rdev);
> int grp, val;
>
> - grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
> - if (grp < 0)
> - return grp;
> + if (!(info->features & TWL6025_SUBCLASS)) {
> + grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
> + if (grp < 0)
> + return grp;
>
> - grp &= P1_GRP_6030;
> + grp &= P1_GRP_6030;
> + } else {
> + grp = 1;
> + }
>
> val = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_STATE);
> val = TWL6030_CFG_STATE_APP(val);
> @@ -159,19 +180,22 @@ static int twl6030reg_is_enabled(struct regulator_dev *rdev)
> static int twlreg_enable(struct regulator_dev *rdev)
> {
> struct twlreg_info *info = rdev_get_drvdata(rdev);
> - int grp;
> - int ret;
> + int grp = 0;
> + int ret = 0;
>
> - grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
> - if (grp < 0)
> - return grp;
> + if (!(twl_class_is_6030() && (info->features & TWL6025_SUBCLASS))) {
> + grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
> + if (grp < 0)
> + return grp;
>
> - if (twl_class_is_4030())
> - grp |= P1_GRP_4030;
> - else
> - grp |= P1_GRP_6030;
> + if (twl_class_is_4030())
> + grp |= P1_GRP_4030;
> + else
> + grp |= P1_GRP_6030;
>
> - ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
> + ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER,
> + VREG_GRP, grp);
> + }
>
> if (!ret && twl_class_is_6030())
> ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_STATE,
> @@ -186,29 +210,34 @@ static int twlreg_enable(struct regulator_dev *rdev)
> static int twlreg_disable(struct regulator_dev *rdev)
> {
> struct twlreg_info *info = rdev_get_drvdata(rdev);
> - int grp;
> - int ret;
> -
> - grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
> - if (grp < 0)
> - return grp;
> -
> - /* For 6030, set the off state for all grps enabled */
> - if (twl_class_is_6030()) {
> - ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_STATE,
> - (grp & (P1_GRP_6030 | P2_GRP_6030 | P3_GRP_6030)) <<
> - TWL6030_CFG_STATE_GRP_SHIFT |
> - TWL6030_CFG_STATE_OFF);
> + int grp = 0;
> + int ret = 0;
> +
> + if (!(twl_class_is_6030() && (info->features & TWL6025_SUBCLASS))) {
> + grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
> + if (grp < 0)
> + return grp;
> +
> + /* For 6030, set the off state for all grps enabled */
> + if (twl_class_is_6030()) {
> + ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER,
> + VREG_STATE,
> + (grp & (P1_GRP_6030 | P2_GRP_6030 |
> + P3_GRP_6030)) <<
> + TWL6030_CFG_STATE_GRP_SHIFT |
> + TWL6030_CFG_STATE_OFF);
> if (ret)
> return ret;
> - }
> + }
>
> - if (twl_class_is_4030())
> - grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030);
> - else
> - grp &= ~(P1_GRP_6030 | P2_GRP_6030 | P3_GRP_6030);
> + if (twl_class_is_4030())
> + grp &= ~(P1_GRP_4030 | P2_GRP_4030 | P3_GRP_4030);
> + else
> + grp &= ~(P1_GRP_6030 | P2_GRP_6030 | P3_GRP_6030);
>
> - ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
> + ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER,
> + VREG_GRP, grp);
> + }
>
> /* Next, associate cleared grp in state register */
> if (!ret && twl_class_is_6030())
> @@ -299,10 +328,11 @@ static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
> static int twl6030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
> {
> struct twlreg_info *info = rdev_get_drvdata(rdev);
> - int grp;
> + int grp = 0;
> int val;
>
> - grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
> + if (!(twl_class_is_6030() && (info->features & TWL6025_SUBCLASS)))
> + grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
>
> if (grp < 0)
> return grp;
> @@ -594,6 +624,230 @@ static struct regulator_ops twl6030_fixed_resource = {
> .get_status = twl6030reg_get_status,
> };
>
> +/*
> + * DCDC status and control
> + */
> +
<snip>
> +
> +static struct regulator_ops twldcdc_ops = {
> + .list_voltage = twl6030dcdc_list_voltage,
> +
> + .set_voltage = twl6030dcdc_set_voltage,
> + .get_voltage_sel = twl6030dcdc_get_voltage_sel,
These 3 dcdc related function is specific to twl6025, could you please rename it
> +
> + .enable = twlreg_enable,
> + .disable = twlreg_disable,
> + .is_enabled = twl6030reg_is_enabled,
> +
> + .set_mode = twl6030reg_set_mode,
> +
> + .get_status = twl6030reg_get_status,
Can you define separate twl6025 specific regulator enable/disable/is_enabled
/set_mode and get_status function
This can improve readability, reduce the number of if
and improves maintainability of previous twl chips
> +};
> +
> /*----------------------------------------------------------------------*/
>
> #define TWL4030_FIXED_LDO(label, offset, mVolts, num, turnon_delay, \
> @@ -636,6 +890,22 @@ static struct regulator_ops twl6030_fixed_resource = {
> }, \
> }
>
> +#define TWL6025_ADJUSTABLE_LDO(label, offset, min_mVolts, max_mVolts, num, \
> + remap_conf) { \
> + .base = offset, \
> + .id = num, \
> + .min_mV = min_mVolts, \
> + .max_mV = max_mVolts, \
> + .remap = remap_conf, \
> + .desc = { \
> + .name = #label, \
> + .id = TWL6025_REG_##label, \
> + .n_voltages = ((max_mVolts - min_mVolts)/100) + 1, \
> + .ops = &twl6030ldo_ops, \
> + .type = REGULATOR_VOLTAGE, \
> + .owner = THIS_MODULE, \
> + }, \
> + }
>
> #define TWL_FIXED_LDO(label, offset, mVolts, num, turnon_delay, remap_conf, \
> family, operations) { \
> @@ -667,6 +937,23 @@ static struct regulator_ops twl6030_fixed_resource = {
> }, \
> }
>
> +#define TWL6025_ADJUSTABLE_DCDC(label, offset, num, \
> + remap_conf) { \
> + .base = offset, \
> + .id = num, \
> + .min_mV = 600, \
> + .max_mV = 2100, \
> + .remap = remap_conf, \
remap is not used for twl6025?
> + .desc = { \
> + .name = #label, \
> + .id = TWL6025_REG_##label, \
> + .n_voltages = 63, \
--
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