[PATCH v2 4/4] usb: usb3503: Convert to use GPIO descriptors

Marek Szyprowski
2019-12-11T14:53:23Z

From: Linus Walleij <linus.walleij@linaro.org>

This converts the USB3503 to pick GPIO descriptors from the
device tree instead of iteratively picking out GPIO number
references and then referencing these from the global GPIO
numberspace.

The USB3503 is only used from device tree among the in-tree
platforms. If board files would still desire to use it they can
provide machine descriptor tables.

Make sure to preserve semantics such as the reset delay
introduced by Stefan.

Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
[mszyprow: invert the logic behind reset GPIO line]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
drivers/usb/misc/usb3503.c | 94 ++++++++++-----------------
include/linux/platform_data/usb3503.h | 3 -
2 files changed, 35 insertions(+), 62 deletions(-)

diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c
index 72f39a9751b5..116bd789e568 100644
--- a/drivers/usb/misc/usb3503.c
+++ b/drivers/usb/misc/usb3503.c
@@ -7,11 +7,10 @@

#include <linux/clk.h>
#include <linux/i2c.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/module.h>
-#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/platform_data/usb3503.h>
#include <linux/regmap.h>
@@ -47,19 +46,19 @@ struct usb3503 {
struct device *dev;
struct clk *clk;
u8 port_off_mask;
- int gpio_intn;
- int gpio_reset;
- int gpio_connect;
+ struct gpio_desc *intn;
+ struct gpio_desc *reset;
+ struct gpio_desc *connect;
bool secondary_ref_clk;
};

static int usb3503_reset(struct usb3503 *hub, int state)
{
- if (!state && gpio_is_valid(hub->gpio_connect))
- gpio_set_value_cansleep(hub->gpio_connect, 0);
+ if (!state && hub->connect)
+ gpiod_set_value_cansleep(hub->connect, 0);

- if (gpio_is_valid(hub->gpio_reset))
- gpio_set_value_cansleep(hub->gpio_reset, state);
+ if (hub->reset)
+ gpiod_set_value_cansleep(hub->reset, !state);

/* Wait T_HUBINIT == 4ms for hub logic to stabilize */
if (state)
@@ -115,8 +114,8 @@ static int usb3503_connect(struct usb3503 *hub)
}
}

- if (gpio_is_valid(hub->gpio_connect))
- gpio_set_value_cansleep(hub->gpio_connect, 1);
+ if (hub->connect)
+ gpiod_set_value_cansleep(hub->connect, 1);

hub->mode = USB3503_MODE_HUB;
dev_info(dev, "switched to HUB mode\n");
@@ -163,13 +162,11 @@ static int usb3503_probe(struct usb3503 *hub)
int err;
u32 mode = USB3503_MODE_HUB;
const u32 *property;
+ enum gpiod_flags flags;
int len;

if (pdata) {
hub->port_off_mask = pdata->port_off_mask;
- hub->gpio_intn = pdata->gpio_intn;
- hub->gpio_connect = pdata->gpio_connect;
- hub->gpio_reset = pdata->gpio_reset;
hub->mode = pdata->initial_mode;
} else if (np) {
u32 rate = 0;
@@ -230,59 +227,38 @@ static int usb3503_probe(struct usb3503 *hub)
}
}

- hub->gpio_intn = of_get_named_gpio(np, "intn-gpios", 0);
- if (hub->gpio_intn == -EPROBE_DEFER)
- return -EPROBE_DEFER;
- hub->gpio_connect = of_get_named_gpio(np, "connect-gpios", 0);
- if (hub->gpio_connect == -EPROBE_DEFER)
- return -EPROBE_DEFER;
- hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
- if (hub->gpio_reset == -EPROBE_DEFER)
- return -EPROBE_DEFER;
of_property_read_u32(np, "initial-mode", &mode);
hub->mode = mode;
}

- if (hub->port_off_mask && !hub->regmap)
- dev_err(dev, "Ports disabled with no control interface\n");
-
- if (gpio_is_valid(hub->gpio_intn)) {
- int val = hub->secondary_ref_clk ? GPIOF_OUT_INIT_LOW :
- GPIOF_OUT_INIT_HIGH;
- err = devm_gpio_request_one(dev, hub->gpio_intn, val,
- "usb3503 intn");
- if (err) {
- dev_err(dev,
- "unable to request GPIO %d as interrupt pin (%d)\n",
- hub->gpio_intn, err);
- return err;
- }
- }
-
- if (gpio_is_valid(hub->gpio_connect)) {
- err = devm_gpio_request_one(dev, hub->gpio_connect,
- GPIOF_OUT_INIT_LOW, "usb3503 connect");
- if (err) {
- dev_err(dev,
- "unable to request GPIO %d as connect pin (%d)\n",
- hub->gpio_connect, err);
- return err;
- }
- }
-
- if (gpio_is_valid(hub->gpio_reset)) {
- err = devm_gpio_request_one(dev, hub->gpio_reset,
- GPIOF_OUT_INIT_LOW, "usb3503 reset");
+ if (hub->secondary_ref_clk)
+ flags = GPIOD_OUT_LOW;
+ else
+ flags = GPIOD_OUT_HIGH;
+ hub->intn = devm_gpiod_get_optional(dev, "intn", flags);
+ if (IS_ERR(hub->intn))
+ return PTR_ERR(hub->intn);
+ if (hub->intn)
+ gpiod_set_consumer_name(hub->intn, "usb3503 intn");
+
+ hub->connect = devm_gpiod_get_optional(dev, "connect", GPIOD_OUT_LOW);
+ if (IS_ERR(hub->connect))
+ return PTR_ERR(hub->connect);
+ if (hub->connect)
+ gpiod_set_consumer_name(hub->connect, "usb3503 connect");
+
+ hub->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(hub->reset))
+ return PTR_ERR(hub->reset);
+ if (hub->reset) {
/* Datasheet defines a hardware reset to be at least 100us */
usleep_range(100, 10000);
- if (err) {
- dev_err(dev,
- "unable to request GPIO %d as reset pin (%d)\n",
- hub->gpio_reset, err);
- return err;
- }
+ gpiod_set_consumer_name(hub->reset, "usb3503 reset");
}

+ if (hub->port_off_mask && !hub->regmap)
+ dev_err(dev, "Ports disabled with no control interface\n");
+
usb3503_switch_mode(hub, hub->mode);

dev_info(dev, "%s: probed in %s mode\n", __func__,
diff --git a/include/linux/platform_data/usb3503.h b/include/linux/platform_data/usb3503.h
index e049d51c1353..d01ef97ddf36 100644
--- a/include/linux/platform_data/usb3503.h
+++ b/include/linux/platform_data/usb3503.h
@@ -17,9 +17,6 @@ enum usb3503_mode {
struct usb3503_platform_data {
enum usb3503_mode initial_mode;
u8 port_off_mask;
- int gpio_intn;
- int gpio_connect;
- int gpio_reset;
};

#endif