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path: root/drivers/gpio/gpio-syscon.c
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Diffstat (limited to 'drivers/gpio/gpio-syscon.c')
-rw-r--r--drivers/gpio/gpio-syscon.c75
1 files changed, 32 insertions, 43 deletions
diff --git a/drivers/gpio/gpio-syscon.c b/drivers/gpio/gpio-syscon.c
index 7f3da34c7874..40064d4cf47f 100644
--- a/drivers/gpio/gpio-syscon.c
+++ b/drivers/gpio/gpio-syscon.c
@@ -1,19 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SYSCON GPIO driver
*
* Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
*/
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/of.h>
-#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
@@ -28,27 +23,25 @@
/**
* struct syscon_gpio_data - Configuration for the device.
- * compatible: SYSCON driver compatible string.
- * flags: Set of GPIO_SYSCON_FEAT_ flags:
+ * @flags: Set of GPIO_SYSCON_FEAT_ flags:
* GPIO_SYSCON_FEAT_IN: GPIOs supports input,
* GPIO_SYSCON_FEAT_OUT: GPIOs supports output,
* GPIO_SYSCON_FEAT_DIR: GPIOs supports switch direction.
- * bit_count: Number of bits used as GPIOs.
- * dat_bit_offset: Offset (in bits) to the first GPIO bit.
- * dir_bit_offset: Optional offset (in bits) to the first bit to switch
+ * @bit_count: Number of bits used as GPIOs.
+ * @dat_bit_offset: Offset (in bits) to the first GPIO bit.
+ * @dir_bit_offset: Optional offset (in bits) to the first bit to switch
* GPIO direction (Used with GPIO_SYSCON_FEAT_DIR flag).
- * set: HW specific callback to assigns output value
+ * @set: HW specific callback to assigns output value
* for signal "offset"
*/
struct syscon_gpio_data {
- const char *compatible;
unsigned int flags;
unsigned int bit_count;
unsigned int dat_bit_offset;
unsigned int dir_bit_offset;
- void (*set)(struct gpio_chip *chip,
- unsigned offset, int value);
+ int (*set)(struct gpio_chip *chip, unsigned int offset,
+ int value);
};
struct syscon_gpio_priv {
@@ -75,17 +68,17 @@ static int syscon_gpio_get(struct gpio_chip *chip, unsigned offset)
return !!(val & BIT(offs % SYSCON_REG_BITS));
}
-static void syscon_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
+static int syscon_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
{
struct syscon_gpio_priv *priv = gpiochip_get_data(chip);
unsigned int offs;
offs = priv->dreg_offset + priv->data->dat_bit_offset + offset;
- regmap_update_bits(priv->syscon,
- (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,
- BIT(offs % SYSCON_REG_BITS),
- val ? BIT(offs % SYSCON_REG_BITS) : 0);
+ return regmap_update_bits(priv->syscon,
+ (offs / SYSCON_REG_BITS) * SYSCON_REG_SIZE,
+ BIT(offs % SYSCON_REG_BITS),
+ val ? BIT(offs % SYSCON_REG_BITS) : 0);
}
static int syscon_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
@@ -122,21 +115,18 @@ static int syscon_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int val)
BIT(offs % SYSCON_REG_BITS));
}
- chip->set(chip, offset, val);
-
- return 0;
+ return chip->set(chip, offset, val);
}
static const struct syscon_gpio_data clps711x_mctrl_gpio = {
/* ARM CLPS711X SYSFLG1 Bits 8-10 */
- .compatible = "cirrus,ep7209-syscon1",
.flags = GPIO_SYSCON_FEAT_IN,
.bit_count = 3,
.dat_bit_offset = 0x40 * 8 + 8,
};
-static void rockchip_gpio_set(struct gpio_chip *chip, unsigned int offset,
- int val)
+static int rockchip_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int val)
{
struct syscon_gpio_priv *priv = gpiochip_get_data(chip);
unsigned int offs;
@@ -152,6 +142,8 @@ static void rockchip_gpio_set(struct gpio_chip *chip, unsigned int offset,
data);
if (ret < 0)
dev_err(chip->parent, "gpio write failed ret(%d)\n", ret);
+
+ return ret;
}
static const struct syscon_gpio_data rockchip_rk3328_gpio_mute = {
@@ -164,7 +156,8 @@ static const struct syscon_gpio_data rockchip_rk3328_gpio_mute = {
#define KEYSTONE_LOCK_BIT BIT(0)
-static void keystone_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
+static int keystone_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int val)
{
struct syscon_gpio_priv *priv = gpiochip_get_data(chip);
unsigned int offs;
@@ -173,7 +166,7 @@ static void keystone_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
offs = priv->dreg_offset + priv->data->dat_bit_offset + offset;
if (!val)
- return;
+ return 0;
ret = regmap_update_bits(
priv->syscon,
@@ -182,11 +175,12 @@ static void keystone_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
BIT(offs % SYSCON_REG_BITS) | KEYSTONE_LOCK_BIT);
if (ret < 0)
dev_err(chip->parent, "gpio write failed ret(%d)\n", ret);
+
+ return ret;
}
static const struct syscon_gpio_data keystone_dsp_gpio = {
/* ARM Keystone 2 */
- .compatible = NULL,
.flags = GPIO_SYSCON_FEAT_OUT,
.bit_count = 28,
.dat_bit_offset = 4,
@@ -216,6 +210,7 @@ static int syscon_gpio_probe(struct platform_device *pdev)
struct syscon_gpio_priv *priv;
struct device_node *np = dev->of_node;
int ret;
+ bool use_parent_regmap = false;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -223,19 +218,15 @@ static int syscon_gpio_probe(struct platform_device *pdev)
priv->data = of_device_get_match_data(dev);
- if (priv->data->compatible) {
- priv->syscon = syscon_regmap_lookup_by_compatible(
- priv->data->compatible);
- if (IS_ERR(priv->syscon))
- return PTR_ERR(priv->syscon);
- } else {
- priv->syscon =
- syscon_regmap_lookup_by_phandle(np, "gpio,syscon-dev");
- if (IS_ERR(priv->syscon) && np->parent)
- priv->syscon = syscon_node_to_regmap(np->parent);
- if (IS_ERR(priv->syscon))
- return PTR_ERR(priv->syscon);
+ priv->syscon = syscon_regmap_lookup_by_phandle(np, "gpio,syscon-dev");
+ if (IS_ERR(priv->syscon) && np->parent) {
+ priv->syscon = syscon_node_to_regmap(np->parent);
+ use_parent_regmap = true;
+ }
+ if (IS_ERR(priv->syscon))
+ return PTR_ERR(priv->syscon);
+ if (!use_parent_regmap) {
ret = of_property_read_u32_index(np, "gpio,syscon-dev", 1,
&priv->dreg_offset);
if (ret)
@@ -264,8 +255,6 @@ static int syscon_gpio_probe(struct platform_device *pdev)
priv->chip.direction_output = syscon_gpio_dir_out;
}
- platform_set_drvdata(pdev, priv);
-
return devm_gpiochip_add_data(&pdev->dev, &priv->chip, priv);
}
generated by cgit (git 2.34.1) at 2025-12-22 09:32:58 +0000