[PATCH v3 1/2] mmc: atmel-mci: Convert to gpio descriptors

From: Balamanikandan Gunasundar
Date: Mon Dec 26 2022 - 02:39:54 EST

Replace the legacy GPIO APIs with gpio descriptor consumer interface.

To maintain backward compatibility, we rely on the "cd-inverted"
property to manage the invertion flag instead of GPIO property.

Signed-off-by: Balamanikandan Gunasundar <balamanikandan.gunasundar@xxxxxxxxxxxxx>
---
drivers/mmc/host/atmel-mci.c | 78 +++++++++++++++++-------------------
include/linux/atmel-mci.h | 4 +-
2 files changed, 39 insertions(+), 43 deletions(-)

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 67b2cd166e56..6ab43733ba9f 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -11,7 +11,6 @@
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
-#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
@@ -19,7 +18,8 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
-#include <linux/of_gpio.h>
+#include <linux/irq.h>
+#include <linux/gpio/consumer.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/seq_file.h>
@@ -389,8 +389,8 @@ struct atmel_mci_slot {
#define ATMCI_CARD_NEED_INIT 1
#define ATMCI_SHUTDOWN 2

- int detect_pin;
- int wp_pin;
+ struct gpio_desc *detect_pin;
+ struct gpio_desc *wp_pin;
bool detect_is_active_high;

struct timer_list detect_timer;
@@ -638,7 +638,10 @@ atmci_of_init(struct platform_device *pdev)
pdata->slot[slot_id].bus_width = 1;

pdata->slot[slot_id].detect_pin =
- of_get_named_gpio(cnp, "cd-gpios", 0);
+ devm_fwnode_gpiod_get(&pdev->dev, of_fwnode_handle(cnp),
+ "cd", GPIOD_IN, "cd-gpios");
+ if (IS_ERR(pdata->slot[slot_id].detect_pin))
+ pdata->slot[slot_id].detect_pin = NULL;

pdata->slot[slot_id].detect_is_active_high =
of_property_read_bool(cnp, "cd-inverted");
@@ -647,7 +650,10 @@ atmci_of_init(struct platform_device *pdev)
of_property_read_bool(cnp, "non-removable");

pdata->slot[slot_id].wp_pin =
- of_get_named_gpio(cnp, "wp-gpios", 0);
+ devm_fwnode_gpiod_get(&pdev->dev, of_fwnode_handle(cnp),
+ "wp", GPIOD_IN, "wp-gpios");
+ if (IS_ERR(pdata->slot[slot_id].wp_pin))
+ pdata->slot[slot_id].wp_pin = NULL;
}

return pdata;
@@ -1511,8 +1517,8 @@ static int atmci_get_ro(struct mmc_host *mmc)
int read_only = -ENOSYS;
struct atmel_mci_slot *slot = mmc_priv(mmc);

- if (gpio_is_valid(slot->wp_pin)) {
- read_only = gpio_get_value(slot->wp_pin);
+ if (slot->wp_pin) {
+ read_only = gpiod_get_value(slot->wp_pin);
dev_dbg(&mmc->class_dev, "card is %s\n",
read_only ? "read-only" : "read-write");
}
@@ -1525,8 +1531,8 @@ static int atmci_get_cd(struct mmc_host *mmc)
int present = -ENOSYS;
struct atmel_mci_slot *slot = mmc_priv(mmc);

- if (gpio_is_valid(slot->detect_pin)) {
- present = !(gpio_get_value(slot->detect_pin) ^
+ if (slot->detect_pin) {
+ present = !(gpiod_get_raw_value(slot->detect_pin) ^
slot->detect_is_active_high);
dev_dbg(&mmc->class_dev, "card is %spresent\n",
present ? "" : "not ");
@@ -1639,8 +1645,8 @@ static void atmci_detect_change(struct timer_list *t)
if (test_bit(ATMCI_SHUTDOWN, &slot->flags))
return;

- enable_irq(gpio_to_irq(slot->detect_pin));
- present = !(gpio_get_value(slot->detect_pin) ^
+ enable_irq(gpiod_to_irq(slot->detect_pin));
+ present = !(gpiod_get_raw_value(slot->detect_pin) ^
slot->detect_is_active_high);
present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);

@@ -2241,9 +2247,9 @@ static int atmci_init_slot(struct atmel_mci *host,
dev_dbg(&mmc->class_dev,
"slot[%u]: bus_width=%u, detect_pin=%d, "
"detect_is_active_high=%s, wp_pin=%d\n",
- id, slot_data->bus_width, slot_data->detect_pin,
+ id, slot_data->bus_width, desc_to_gpio(slot_data->detect_pin),
slot_data->detect_is_active_high ? "true" : "false",
- slot_data->wp_pin);
+ desc_to_gpio(slot_data->wp_pin));

mmc->ops = &atmci_ops;
mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
@@ -2279,51 +2285,43 @@ static int atmci_init_slot(struct atmel_mci *host,

/* Assume card is present initially */
set_bit(ATMCI_CARD_PRESENT, &slot->flags);
- if (gpio_is_valid(slot->detect_pin)) {
- if (devm_gpio_request(&host->pdev->dev, slot->detect_pin,
- "mmc_detect")) {
- dev_dbg(&mmc->class_dev, "no detect pin available\n");
- slot->detect_pin = -EBUSY;
- } else if (gpio_get_value(slot->detect_pin) ^
- slot->detect_is_active_high) {
+ if (slot->detect_pin) {
+ if (gpiod_get_raw_value(slot->detect_pin) ^
+ slot->detect_is_active_high) {
clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
}
+ } else {
+ dev_dbg(&mmc->class_dev, "no detect pin available\n");
}

- if (!gpio_is_valid(slot->detect_pin)) {
+ if (!slot->detect_pin) {
if (slot_data->non_removable)
mmc->caps |= MMC_CAP_NONREMOVABLE;
else
mmc->caps |= MMC_CAP_NEEDS_POLL;
}

- if (gpio_is_valid(slot->wp_pin)) {
- if (devm_gpio_request(&host->pdev->dev, slot->wp_pin,
- "mmc_wp")) {
- dev_dbg(&mmc->class_dev, "no WP pin available\n");
- slot->wp_pin = -EBUSY;
- }
- }
+ if (!slot->wp_pin)
+ dev_dbg(&mmc->class_dev, "no WP pin available\n");

host->slot[id] = slot;
mmc_regulator_get_supply(mmc);
- mmc_pwrseq_alloc(slot->mmc);
mmc_add_host(mmc);

- if (gpio_is_valid(slot->detect_pin)) {
+ if (slot->detect_pin) {
int ret;

timer_setup(&slot->detect_timer, atmci_detect_change, 0);

- ret = request_irq(gpio_to_irq(slot->detect_pin),
- atmci_detect_interrupt,
- IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
- "mmc-detect", slot);
+ ret = request_irq(gpiod_to_irq(slot->detect_pin),
+ atmci_detect_interrupt,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+ "mmc-detect", slot);
if (ret) {
dev_dbg(&mmc->class_dev,
"could not request IRQ %d for detect pin\n",
- gpio_to_irq(slot->detect_pin));
- slot->detect_pin = -EBUSY;
+ gpiod_to_irq(slot->detect_pin));
+ slot->detect_pin = NULL;
}
}

@@ -2342,10 +2340,8 @@ static void atmci_cleanup_slot(struct atmel_mci_slot *slot,

mmc_remove_host(slot->mmc);

- if (gpio_is_valid(slot->detect_pin)) {
- int pin = slot->detect_pin;
-
- free_irq(gpio_to_irq(pin), slot);
+ if (slot->detect_pin) {
+ free_irq(gpiod_to_irq(slot->detect_pin), slot);
del_timer_sync(&slot->detect_timer);
}

diff --git a/include/linux/atmel-mci.h b/include/linux/atmel-mci.h
index 1491af38cc6e..017e7d8f6126 100644
--- a/include/linux/atmel-mci.h
+++ b/include/linux/atmel-mci.h
@@ -26,8 +26,8 @@
*/
struct mci_slot_pdata {
unsigned int bus_width;
- int detect_pin;
- int wp_pin;
+ struct gpio_desc *detect_pin;
+ struct gpio_desc *wp_pin;
bool detect_is_active_high;
bool non_removable;
};
--
2.25.1