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authorFrieder Schrempf <frieder.schrempf@kontron.de>2021-02-11 13:55:28 +0300
committerMark Brown <broonie@kernel.org>2021-02-11 16:11:34 +0300
commit8c67a11bae889f51fe5054364c3c789dfae3ad73 (patch)
tree70d31c34dbbc50889d7845bccf547e8b53506435 /drivers/regulator
parent7aa382cfe714f61b0c29f02c31d389c506b4e2ae (diff)
downloadlinux-8c67a11bae889f51fe5054364c3c789dfae3ad73.tar.xz
regulator: pca9450: Add SD_VSEL GPIO for LDO5
LDO5 has two separate control registers. LDO5CTRL_L is used if the input signal SD_VSEL is low and LDO5CTRL_H if it is high. The current driver implementation only uses LDO5CTRL_H. To make this work on boards that have SD_VSEL connected to a GPIO, we add support for specifying an optional GPIO and setting it to high at probe time. In the future we might also want to add support for boards that have SD_VSEL set to a fixed low level. In this case we need to change the driver to be able to use the LDO5CTRL_L register. Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de> Link: https://lore.kernel.org/r/20210211105534.38972-1-frieder.schrempf@kontron.de Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/pca9450-regulator.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/regulator/pca9450-regulator.c b/drivers/regulator/pca9450-regulator.c
index cb29421d745a..1bba8fdcb7b7 100644
--- a/drivers/regulator/pca9450-regulator.c
+++ b/drivers/regulator/pca9450-regulator.c
@@ -5,6 +5,7 @@
*/
#include <linux/err.h>
+#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
@@ -32,6 +33,7 @@ struct pca9450_regulator_desc {
struct pca9450 {
struct device *dev;
struct regmap *regmap;
+ struct gpio_desc *sd_vsel_gpio;
enum pca9450_chip_type type;
unsigned int rcnt;
int irq;
@@ -795,6 +797,18 @@ static int pca9450_i2c_probe(struct i2c_client *i2c,
return ret;
}
+ /*
+ * The driver uses the LDO5CTRL_H register to control the LDO5 regulator.
+ * This is only valid if the SD_VSEL input of the PMIC is high. Let's
+ * check if the pin is available as GPIO and set it to high.
+ */
+ pca9450->sd_vsel_gpio = gpiod_get_optional(pca9450->dev, "sd-vsel", GPIOD_OUT_HIGH);
+
+ if (IS_ERR(pca9450->sd_vsel_gpio)) {
+ dev_err(&i2c->dev, "Failed to get SD_VSEL GPIO\n");
+ return ret;
+ }
+
dev_info(&i2c->dev, "%s probed.\n",
type == PCA9450_TYPE_PCA9450A ? "pca9450a" : "pca9450bc");