linux-kernel - [PATCH v6 10/16] regulator: rohm-regulator: linear voltage support

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Message-ID: <8a9519e2fb81569c7488737901f0ecab926c658e.1617616855.git.matti.vaittinen@fi.rohmeurope.com>
Date:   Mon, 5 Apr 2021 14:43:26 +0300
From:   Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Matti Vaittinen <mazziesaccount@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        linux-power@...rohmeurope.com, linux-kernel@...r.kernel.org
Subject: [PATCH v6 10/16] regulator: rohm-regulator: linear voltage support

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@...rohmeurope.com>
Acked-by: Mark Brown <broonie@...nel.org>
---
Changes since v3:
  - No changes
 drivers/regulator/rohm-regulator.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/regulator/rohm-regulator.c b/drivers/regulator/rohm-regulator.c
index 5c558b153d55..63aabb8c7786 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) {
-- 
2.25.4


-- 
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =]