From: Philippe Schenker <philippe.schenker@toradex.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Mark Brown <broonie@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
Liam Girdwood <lgirdwood@gmail.com>
Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
Max Krummenacher <max.krummenacher@toradex.com>,
Rob Herring <robh+dt@kernel.org>,
Stefan Agner <stefan.agner@toradex.com>,
Marcel Ziswiler <marcel.ziswiler@toradex.com>,
Mark Rutland <mark.rutland@arm.com>,
Luka Pivk <luka.pivk@toradex.com>,
Philippe Schenker <philippe.schenker@toradex.com>
Subject: [PATCH v2 1/3] regulator: fixed: add possibility to enable by clock
Date: Tue, 10 Sep 2019 06:21:15 +0000 [thread overview]
Message-ID: <20190910062103.39641-2-philippe.schenker@toradex.com> (raw)
In-Reply-To: <20190910062103.39641-1-philippe.schenker@toradex.com>
This commit adds the possibility to choose the compatible
"regulator-fixed-clock" in devicetree.
This is a special regulator-fixed that has to have a clock, from which
the regulator gets switched on and off.
Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
---
Changes in v2:
- return priv->clk_enable_counter > 0 directly.
drivers/regulator/fixed.c | 83 +++++++++++++++++++++++++++++++++++++--
1 file changed, 80 insertions(+), 3 deletions(-)
diff --git a/drivers/regulator/fixed.c b/drivers/regulator/fixed.c
index 999547dde99d..d90a6fd8cbc7 100644
--- a/drivers/regulator/fixed.c
+++ b/drivers/regulator/fixed.c
@@ -23,14 +23,63 @@
#include <linux/gpio/consumer.h>
#include <linux/slab.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/machine.h>
+#include <linux/clk.h>
+
struct fixed_voltage_data {
struct regulator_desc desc;
struct regulator_dev *dev;
+
+ struct clk *enable_clock;
+ unsigned int clk_enable_counter;
};
+struct fixed_dev_type {
+ bool has_enable_clock;
+};
+
+static const struct fixed_dev_type fixed_voltage_data = {
+ .has_enable_clock = false,
+};
+
+static const struct fixed_dev_type fixed_clkenable_data = {
+ .has_enable_clock = true,
+};
+
+static int reg_clock_enable(struct regulator_dev *rdev)
+{
+ struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
+ int ret = 0;
+
+ ret = clk_prepare_enable(priv->enable_clock);
+ if (ret)
+ return ret;
+
+ priv->clk_enable_counter++;
+
+ return ret;
+}
+
+static int reg_clock_disable(struct regulator_dev *rdev)
+{
+ struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
+
+ clk_disable_unprepare(priv->enable_clock);
+ priv->clk_enable_counter--;
+
+ return 0;
+}
+
+static int reg_clock_is_enabled(struct regulator_dev *rdev)
+{
+ struct fixed_voltage_data *priv = rdev_get_drvdata(rdev);
+
+ return priv->clk_enable_counter > 0;
+}
+
/**
* of_get_fixed_voltage_config - extract fixed_voltage_config structure info
@@ -84,10 +133,19 @@ of_get_fixed_voltage_config(struct device *dev,
static struct regulator_ops fixed_voltage_ops = {
};
+static struct regulator_ops fixed_voltage_clkenabled_ops = {
+ .enable = reg_clock_enable,
+ .disable = reg_clock_disable,
+ .is_enabled = reg_clock_is_enabled,
+};
+
static int reg_fixed_voltage_probe(struct platform_device *pdev)
{
+ struct device *dev = &pdev->dev;
struct fixed_voltage_config *config;
struct fixed_voltage_data *drvdata;
+ const struct fixed_dev_type *drvtype =
+ of_match_device(dev->driver->of_match_table, dev)->data;
struct regulator_config cfg = { };
enum gpiod_flags gflags;
int ret;
@@ -118,7 +176,18 @@ static int reg_fixed_voltage_probe(struct platform_device *pdev)
}
drvdata->desc.type = REGULATOR_VOLTAGE;
drvdata->desc.owner = THIS_MODULE;
- drvdata->desc.ops = &fixed_voltage_ops;
+
+ if (drvtype->has_enable_clock) {
+ drvdata->desc.ops = &fixed_voltage_clkenabled_ops;
+
+ drvdata->enable_clock = devm_clk_get(dev, NULL);
+ if (IS_ERR(drvdata->enable_clock)) {
+ dev_err(dev, "Cant get enable-clock from devicetree\n");
+ return -ENOENT;
+ }
+ } else {
+ drvdata->desc.ops = &fixed_voltage_ops;
+ }
drvdata->desc.enable_time = config->startup_delay;
@@ -191,8 +260,16 @@ static int reg_fixed_voltage_probe(struct platform_device *pdev)
#if defined(CONFIG_OF)
static const struct of_device_id fixed_of_match[] = {
- { .compatible = "regulator-fixed", },
- {},
+ {
+ .compatible = "regulator-fixed",
+ .data = &fixed_voltage_data,
+ },
+ {
+ .compatible = "regulator-fixed-clock",
+ .data = &fixed_clkenable_data,
+ },
+ {
+ },
};
MODULE_DEVICE_TABLE(of, fixed_of_match);
#endif
--
2.23.0
next prev parent reply other threads:[~2019-09-10 6:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-10 6:21 [PATCH v2 0/3] Add new binding regulator-fixed-clock to regulator-fixed Philippe Schenker
2019-09-10 6:21 ` Philippe Schenker [this message]
2019-10-07 13:29 ` [PATCH v2 1/3] regulator: fixed: add possibility to enable by clock Guenter Roeck
2019-10-07 13:57 ` Philippe Schenker
2019-10-07 14:25 ` Guenter Roeck
2019-09-10 6:21 ` [PATCH v2 2/3] ARM: dts: imx6ull-colibri: add phy-supply and respective regulator Philippe Schenker
2019-09-10 6:21 ` [PATCH v2 3/3] dt-bindings: regulator: add regulator-fixed-clock binding Philippe Schenker
2019-09-10 8:35 ` Rob Herring
2019-09-17 20:13 ` Rob Herring
2019-09-23 6:58 ` Philippe Schenker
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