From: Lee Jones <lee.jones@linaro.org>
To: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Cc: mazziesaccount@gmail.com, Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>,
linux-kernel@vger.kernel.org, linux-power@fi.rohmeurope.com
Subject: Re: [PATCH 11/15] regulator: rohm-regulator: SNVS dvs and linear voltage support
Date: Fri, 15 Jan 2021 08:26:36 +0000 [thread overview]
Message-ID: <20210115082636.GF3975472@dell> (raw)
In-Reply-To: <f0af653b3d3d56bd1852468502518a54b31b1f10.1610110144.git.matti.vaittinen@fi.rohmeurope.com>
On Fri, 08 Jan 2021, Matti Vaittinen wrote:
> The helper for obtaining HW-state based DVS voltage levels currently only
> works for regulators using linear-ranges. Extend support to regulators with
> simple linear mappings and add also proper error path if pickable-ranges
> regulators call this.
>
> Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
> ---
> drivers/regulator/rohm-regulator.c | 23 +++++++++++++++++++++--
> include/linux/mfd/rohm-generic.h | 6 +++++-
> 2 files changed, 26 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/regulator/rohm-regulator.c b/drivers/regulator/rohm-regulator.c
> index 399002383b28..9248bd63afa9 100644
> --- a/drivers/regulator/rohm-regulator.c
> +++ b/drivers/regulator/rohm-regulator.c
> @@ -22,13 +22,26 @@ static int set_dvs_level(const struct regulator_desc *desc,
> return ret;
> return 0;
> }
> -
> + /* If voltage is set to 0 => disable */
> if (uv == 0) {
> if (omask)
> return regmap_update_bits(regmap, oreg, omask, 0);
> }
> + /* Some setups don't allow setting own voltage but do allow enabling */
> + if (!mask) {
> + if (omask)
> + return regmap_update_bits(regmap, oreg, omask, omask);
> +
> + return -EINVAL;
> + }
> for (i = 0; i < desc->n_voltages; i++) {
> - ret = regulator_desc_list_voltage_linear_range(desc, i);
> + /* NOTE to next hacker - Does not support pickable ranges */
> + if (desc->linear_range_selectors)
> + return -EINVAL;
> + if (desc->n_linear_ranges)
> + ret = regulator_desc_list_voltage_linear_range(desc, i);
> + else
> + ret = regulator_desc_list_voltage_linear(desc, i);
> if (ret < 0)
> continue;
> if (ret == uv) {
> @@ -79,6 +92,12 @@ int rohm_regulator_set_dvs_levels(const struct rohm_dvs_config *dvs,
> mask = dvs->lpsr_mask;
> omask = dvs->lpsr_on_mask;
> break;
> + case ROHM_DVS_LEVEL_SNVS:
> + prop = "rohm,dvs-snvs-voltage";
> + reg = dvs->snvs_reg;
> + mask = dvs->snvs_mask;
> + omask = dvs->snvs_on_mask;
> + break;
> default:
> return -EINVAL;
> }
> diff --git a/include/linux/mfd/rohm-generic.h b/include/linux/mfd/rohm-generic.h
> index e99e569d3cc1..2f5fbfd0c6b3 100644
> --- a/include/linux/mfd/rohm-generic.h
> +++ b/include/linux/mfd/rohm-generic.h
> @@ -27,7 +27,8 @@ enum {
> ROHM_DVS_LEVEL_IDLE,
> ROHM_DVS_LEVEL_SUSPEND,
> ROHM_DVS_LEVEL_LPSR,
> - ROHM_DVS_LEVEL_MAX = ROHM_DVS_LEVEL_LPSR,
> + ROHM_DVS_LEVEL_SNVS,
> + ROHM_DVS_LEVEL_MAX = ROHM_DVS_LEVEL_SNVS,
> };
Does this actually work?
The code that consumes it looks like:
for (i = 0; i < ROHM_DVS_LEVEL_MAX && !ret; i++)
So it will loop through like:
0 (ROHM_DVS_LEVEL_IDLE)
1 (ROHM_DVS_LEVEL_SUSPEND)
2 (ROHM_DVS_LEVEL_LPSR)
3 (ROHM_DVS_LEVEL_SNVS)
Then break, since 'i' will be (== 4) not (< 4).
So the following will never be used:
4 (ROHM_DVS_LEVEL_MAX = ROHM_DVS_LEVEL_SNVS)
Unless I'm missing something, I think MAX should be the last entry.
> /**
> @@ -66,6 +67,9 @@ struct rohm_dvs_config {
> unsigned int lpsr_reg;
> unsigned int lpsr_mask;
> unsigned int lpsr_on_mask;
> + unsigned int snvs_reg;
> + unsigned int snvs_mask;
> + unsigned int snvs_on_mask;
> };
>
> #if IS_ENABLED(CONFIG_REGULATOR_ROHM)
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog
next prev parent reply other threads:[~2021-01-15 8:27 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-08 13:27 [PATCH 00/15] Support ROHM BD71815 PMIC Matti Vaittinen
2021-01-08 13:29 ` [PATCH 01/15] rtc: bd70528: Do not require parent data Matti Vaittinen
2021-01-08 13:31 ` [PATCH 02/15] clk: BD718x7: Do not depend on parent driver data Matti Vaittinen
2021-01-08 13:32 ` [PATCH 03/15] mfd: bd718x7: simplify by cleaning unnecessary device data Matti Vaittinen
2021-01-08 13:34 ` [PATCH 04/15] dt_bindings: bd71828: Add clock output mode Matti Vaittinen
2021-01-13 13:52 ` Rob Herring
2021-01-13 14:52 ` Matti Vaittinen
2021-01-13 15:52 ` Rob Herring
2021-01-08 13:34 ` [PATCH 05/15] dt_bindings: mfd: Add ROHM BD71815 PMIC Matti Vaittinen
2021-01-11 19:06 ` Rob Herring
2021-01-12 6:14 ` Vaittinen, Matti
2021-01-08 13:36 ` [PATCH 06/15] dt_bindings: regulator: Add ROHM BD71815 PMIC regulators Matti Vaittinen
2021-01-11 19:09 ` Rob Herring
2021-01-12 6:10 ` Matti Vaittinen
2021-01-13 13:53 ` Rob Herring
2021-01-13 14:23 ` Vaittinen, Matti
2021-01-13 15:47 ` Rob Herring
2021-01-08 13:37 ` [PATCH 07/15] mfd: Add ROHM BD71815 ID Matti Vaittinen
2021-01-08 13:37 ` [PATCH 08/15] mfd: Support for ROHM BD71815 PMIC core Matti Vaittinen
2021-01-08 13:39 ` [PATCH 09/15] gpio: support ROHM BD71815 GPOs Matti Vaittinen
2021-01-08 19:28 ` kernel test robot
2021-01-09 0:45 ` Linus Walleij
2021-01-11 6:15 ` Vaittinen, Matti
2021-01-11 7:26 ` Vaittinen, Matti
2021-01-08 13:41 ` [PATCH 10/15] regulator: helpers: Export helper voltage listing Matti Vaittinen
2021-01-08 13:42 ` [PATCH 11/15] regulator: rohm-regulator: SNVS dvs and linear voltage support Matti Vaittinen
2021-01-15 8:26 ` Lee Jones [this message]
2021-01-15 9:10 ` Vaittinen, Matti
2021-01-15 9:48 ` Matti Vaittinen
2021-01-08 13:43 ` [PATCH 12/15] regulator: Support ROHM BD71815 regulators Matti Vaittinen
2021-01-08 22:30 ` kernel test robot
2021-01-08 13:45 ` [PATCH 13/15] clk: bd718x7: Add support for clk gate on ROHM BD71815 PMIC Matti Vaittinen
2021-01-08 13:46 ` [PATCH 14/15] rtc: bd70528: Support RTC on ROHM BD71815 Matti Vaittinen
2021-01-08 13:46 ` [PATCH 15/15] MAINTAINERS: Add ROHM BD71815AGW Matti Vaittinen
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