mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: barebox@lists.infradead.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Subject: [PATCH v3 03/17] regulator: Add support for setting regulator's voltage
Date: Tue, 15 Jan 2019 12:25:47 -0800	[thread overview]
Message-ID: <20190115202601.24831-4-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20190115202601.24831-1-andrew.smirnov@gmail.com>

Add code needed to implement regulator_set_voltage(). Currently only
bare minmum needed for ANATOP driver (added in follow up commit) is
supported.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
 drivers/regulator/core.c    | 44 +++++++++++++++++
 drivers/regulator/helpers.c | 99 +++++++++++++++++++++++++++++++++++++
 include/regulator.h         | 24 +++++++++
 3 files changed, 167 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index bcfbda62e3..795dcdb8c1 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -43,6 +43,15 @@ struct regulator {
 	struct device_d *dev;
 };
 
+static int regulator_map_voltage(struct regulator_dev *rdev, int min_uV,
+				 int max_uV)
+{
+	if (rdev->desc->ops->list_voltage == regulator_list_voltage_linear)
+		return regulator_map_voltage_linear(rdev, min_uV, max_uV);
+
+	return -ENOSYS;
+}
+
 static int regulator_enable_internal(struct regulator_internal *ri)
 {
 	int ret;
@@ -86,6 +95,33 @@ static int regulator_disable_internal(struct regulator_internal *ri)
 	return 0;
 }
 
+static int regulator_set_voltage_internal(struct regulator_internal *ri,
+					  int min_uV, int max_uV)
+{
+	struct regulator_dev *rdev = ri->rdev;
+	const struct regulator_ops *ops = rdev->desc->ops;
+	unsigned int selector;
+	int best_val = 0;
+	int ret;
+
+	if (ops->set_voltage_sel) {
+		ret = regulator_map_voltage(rdev, min_uV, max_uV);
+		if (ret >= 0) {
+			best_val = ops->list_voltage(rdev, ret);
+			if (min_uV <= best_val && max_uV >= best_val) {
+				selector = ret;
+				ret = ops->set_voltage_sel(rdev, selector);
+			} else {
+				ret = -EINVAL;
+			}
+		}
+
+		return ret;
+	}
+
+	return -ENOSYS;
+}
+
 static struct regulator_internal * __regulator_register(struct regulator_dev *rd, const char *name)
 {
 	struct regulator_internal *ri;
@@ -320,6 +356,14 @@ int regulator_disable(struct regulator *r)
 	return regulator_disable_internal(r->ri);
 }
 
+int regulator_set_voltage(struct regulator *r, int min_uV, int max_uV)
+{
+	if (!r)
+		return 0;
+
+	return regulator_set_voltage_internal(r->ri, min_uV, max_uV);
+}
+
 static void regulator_print_one(struct regulator_internal *ri)
 {
 	struct regulator *r;
diff --git a/drivers/regulator/helpers.c b/drivers/regulator/helpers.c
index 4495b4403f..f22d21b35d 100644
--- a/drivers/regulator/helpers.c
+++ b/drivers/regulator/helpers.c
@@ -85,3 +85,102 @@ int regulator_disable_regmap(struct regulator_dev *rdev)
 				  rdev->desc->enable_mask, val);
 }
 EXPORT_SYMBOL_GPL(regulator_disable_regmap);
+
+/**
+ * regulator_set_voltage_sel_regmap - standard set_voltage_sel for regmap users
+ *
+ * @rdev: regulator to operate on
+ * @sel: Selector to set
+ *
+ * Regulators that use regmap for their register I/O can set the
+ * vsel_reg and vsel_mask fields in their descriptor and then use this
+ * as their set_voltage_vsel operation, saving some code.
+ */
+int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
+{
+	int ret;
+
+	sel <<= ffs(rdev->desc->vsel_mask) - 1;
+
+	ret = regmap_update_bits(rdev->regmap, rdev->desc->vsel_reg,
+				  rdev->desc->vsel_mask, sel);
+	if (ret)
+		return ret;
+
+	if (rdev->desc->apply_bit)
+		ret = regmap_update_bits(rdev->regmap, rdev->desc->apply_reg,
+					 rdev->desc->apply_bit,
+					 rdev->desc->apply_bit);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_set_voltage_sel_regmap);
+
+/**
+ * regulator_map_voltage_linear - map_voltage() for simple linear mappings
+ *
+ * @rdev: Regulator to operate on
+ * @min_uV: Lower bound for voltage
+ * @max_uV: Upper bound for voltage
+ *
+ * Drivers providing min_uV and uV_step in their regulator_desc can
+ * use this as their map_voltage() operation.
+ */
+int regulator_map_voltage_linear(struct regulator_dev *rdev,
+				 int min_uV, int max_uV)
+{
+	int ret, voltage;
+
+	/* Allow uV_step to be 0 for fixed voltage */
+	if (rdev->desc->n_voltages == 1 && rdev->desc->uV_step == 0) {
+		if (min_uV <= rdev->desc->min_uV && rdev->desc->min_uV <= max_uV)
+			return 0;
+		else
+			return -EINVAL;
+	}
+
+	if (!rdev->desc->uV_step) {
+		BUG_ON(!rdev->desc->uV_step);
+		return -EINVAL;
+	}
+
+	if (min_uV < rdev->desc->min_uV)
+		min_uV = rdev->desc->min_uV;
+
+	ret = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
+	if (ret < 0)
+		return ret;
+
+	ret += rdev->desc->linear_min_sel;
+
+	/* Map back into a voltage to verify we're still in bounds */
+	voltage = rdev->desc->ops->list_voltage(rdev, ret);
+	if (voltage < min_uV || voltage > max_uV)
+		return -EINVAL;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(regulator_map_voltage_linear);
+
+/**
+ * regulator_list_voltage_linear - List voltages with simple calculation
+ *
+ * @rdev: Regulator device
+ * @selector: Selector to convert into a voltage
+ *
+ * Regulators with a simple linear mapping between voltages and
+ * selectors can set min_uV and uV_step in the regulator descriptor
+ * and then use this function as their list_voltage() operation,
+ */
+int regulator_list_voltage_linear(struct regulator_dev *rdev,
+				  unsigned int selector)
+{
+	if (selector >= rdev->desc->n_voltages)
+		return -EINVAL;
+	if (selector < rdev->desc->linear_min_sel)
+		return 0;
+
+	selector -= rdev->desc->linear_min_sel;
+
+	return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
+}
+EXPORT_SYMBOL_GPL(regulator_list_voltage_linear);
diff --git a/include/regulator.h b/include/regulator.h
index 1824e6ea14..cd1d3ccf55 100644
--- a/include/regulator.h
+++ b/include/regulator.h
@@ -5,8 +5,17 @@
 struct regulator;
 
 struct regulator_desc {
+	unsigned n_voltages;
 	const struct regulator_ops *ops;
 
+	unsigned int min_uV;
+	unsigned int uV_step;
+	unsigned int linear_min_sel;
+
+	unsigned int vsel_reg;
+	unsigned int vsel_mask;
+	unsigned int apply_reg;
+	unsigned int apply_bit;
 	unsigned int enable_reg;
 	unsigned int enable_mask;
 	unsigned int enable_val;
@@ -25,6 +34,9 @@ struct regulator_ops {
 	int (*enable) (struct regulator_dev *);
 	int (*disable) (struct regulator_dev *);
 	int (*is_enabled) (struct regulator_dev *);
+
+	int (*list_voltage) (struct regulator_dev *, unsigned int);
+	int (*set_voltage_sel) (struct regulator_dev *, unsigned int);
 };
 
 #ifdef CONFIG_OFDEVICE
@@ -49,6 +61,12 @@ int regulator_disable(struct regulator *);
 int regulator_is_enabled_regmap(struct regulator_dev *);
 int regulator_enable_regmap(struct regulator_dev *);
 int regulator_disable_regmap(struct regulator_dev *);
+int regulator_set_voltage_sel_regmap(struct regulator_dev *, unsigned);
+int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
+int regulator_map_voltage_linear(struct regulator_dev *rdev,
+				 int min_uV, int max_uV);
+int regulator_list_voltage_linear(struct regulator_dev *rdev,
+				  unsigned int selector);
 #else
 
 static inline struct regulator *regulator_get(struct device_d *dev, const char *id)
@@ -66,6 +84,12 @@ static inline int regulator_disable(struct regulator *r)
 	return 0;
 }
 
+static inline int regulator_set_voltage(struct regulator *regulator,
+					int min_uV, int max_uV)
+{
+	return 0;
+}
+
 #endif
 
 #endif /* __REGULATOR_H */
-- 
2.20.1


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

  parent reply	other threads:[~2019-01-15 20:26 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-15 20:25 [PATCH v3 00/17] PCIe support for i.MX7 Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 01/17] regulator: Convert drivers to use struct regulator_desc Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 02/17] regulator: Port basic regmap regulator functions Andrey Smirnov
2019-01-15 20:25 ` Andrey Smirnov [this message]
2019-01-15 20:25 ` [PATCH v3 04/17] base: driver: Drop redundant list_empty() check Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 05/17] regulator: Assume probe deferral instead of missing regulator Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 06/17] regulator: Port ANATOP driver from Linux Andrey Smirnov
2019-01-16  2:10   ` Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 07/17] drivers: base: Port power management code " Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 08/17] soc: imx: Add GPCv2 power gating driver Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 09/17] reset: Add i.MX7 SRC reset driver Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 10/17] reset: Mark local functions as static Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 11/17] PCI: imx6: Add code to support i.MX7D Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 12/17] PCI: imx6: Allow probe deferral by reset GPIO Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 13/17] PCI: imx6: Do not wait for speed change on i.MX7 Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 14/17] PCI: imx6: Do not switch speed if Gen2 is disabled Andrey Smirnov
2019-01-15 20:25 ` [PATCH v3 15/17] PCI: imx6: Fix spelling mistake: "contol" -> "control" Andrey Smirnov
2019-01-15 20:26 ` [PATCH v3 16/17] PCI: imx6: Drop unnecessary root_bus_nr setting Andrey Smirnov
2019-01-15 20:26 ` [PATCH v3 17/17] PCI: imx6: Port imx6_pcie_ltssm_enable() Andrey Smirnov

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190115202601.24831-4-andrew.smirnov@gmail.com \
    --to=andrew.smirnov@gmail.com \
    --cc=barebox@lists.infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox