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Message-ID: <20230825095157.76073-4-balamanikandan.gunasundar@microchip.com>
Date: Fri, 25 Aug 2023 15:21:57 +0530
From: Balamanikandan Gunasundar
<balamanikandan.gunasundar@...rochip.com>
To: <linus.walleij@...aro.org>, <dmitry.torokhov@...il.com>,
<ulf.hansson@...aro.org>, <linux-kernel@...r.kernel.org>,
<linux-mmc@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<ludovic.desroches@...rochip.com>, <nicolas.ferre@...rochip.com>,
<alexandre.belloni@...tlin.com>
CC: <hari.prasathge@...rochip.com>,
<balamanikandan.gunasundar@...rochip.com>
Subject: [PATCH v6 3/3] mmc: atmel-mci: Move card detect gpio polarity quirk to gpiolib
The polarity of the card detection gpio is handled by the "cd-inverted"
property in the device tree. Move this inversion logic to gpiolib to avoid
reading the gpio raw value.
Signed-off-by: Balamanikandan Gunasundar <balamanikandan.gunasundar@...rochip.com>
Suggested-by: Linus Walleij <linus.walleij@...aro.org>
---
drivers/gpio/gpiolib-of.c | 20 ++++++++++++++++++--
drivers/mmc/host/atmel-mci.c | 33 +++++++++++++++------------------
2 files changed, 33 insertions(+), 20 deletions(-)
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 1436cdb5fa26..9694eb5afa21 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -209,6 +209,8 @@ static void of_gpio_set_polarity_by_property(const struct device_node *np,
const char *propname,
enum of_gpio_flags *flags)
{
+ const struct device_node *np_compat = np;
+ const struct device_node *np_propname = np;
static const struct {
const char *compatible;
const char *gpio_propname;
@@ -252,15 +254,29 @@ static void of_gpio_set_polarity_by_property(const struct device_node *np,
#if IS_ENABLED(CONFIG_REGULATOR_GPIO)
{ "regulator-gpio", "enable-gpio", "enable-active-high" },
{ "regulator-gpio", "enable-gpios", "enable-active-high" },
+#endif
+#if IS_ENABLED(CONFIG_MMC_ATMELMCI)
+ { "atmel,hsmci", "cd-gpios", "cd-inverted" },
#endif
};
unsigned int i;
bool active_high;
+#if IS_ENABLED(CONFIG_MMC_ATMELMCI)
+ /*
+ * The Atmel HSMCI has compatible property in the parent node and
+ * gpio property in a child node
+ */
+ if (of_device_is_compatible(np->parent, "atmel,hsmci")) {
+ np_compat = np->parent;
+ np_propname = np;
+ }
+#endif
+
for (i = 0; i < ARRAY_SIZE(gpios); i++) {
- if (of_device_is_compatible(np, gpios[i].compatible) &&
+ if (of_device_is_compatible(np_compat, gpios[i].compatible) &&
!strcmp(propname, gpios[i].gpio_propname)) {
- active_high = of_property_read_bool(np,
+ active_high = of_property_read_bool(np_propname,
gpios[i].polarity_propname);
of_gpio_quirk_polarity(np, active_high, flags);
break;
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index 6f815818dd22..535783c43105 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -206,7 +206,6 @@ enum atmci_pdc_buf {
* @bus_width: Number of data lines wired up the slot
* @detect_pin: GPIO pin wired to the card detect switch
* @wp_pin: GPIO pin wired to the write protect sensor
- * @detect_is_active_high: The state of the detect pin when it is active
* @non_removable: The slot is not removable, only detect once
*
* If a given slot is not present on the board, @bus_width should be
@@ -222,7 +221,6 @@ struct mci_slot_pdata {
unsigned int bus_width;
struct gpio_desc *detect_pin;
struct gpio_desc *wp_pin;
- bool detect_is_active_high;
bool non_removable;
};
@@ -405,7 +403,6 @@ struct atmel_mci {
* available.
* @wp_pin: GPIO pin used for card write protect sending, or negative
* if not available.
- * @detect_is_active_high: The state of the detect pin when it is active.
* @detect_timer: Timer used for debouncing @detect_pin interrupts.
*/
struct atmel_mci_slot {
@@ -426,7 +423,6 @@ struct atmel_mci_slot {
struct gpio_desc *detect_pin;
struct gpio_desc *wp_pin;
- bool detect_is_active_high;
struct timer_list detect_timer;
};
@@ -644,6 +640,7 @@ atmci_of_init(struct platform_device *pdev)
struct device_node *cnp;
struct mci_platform_data *pdata;
u32 slot_id;
+ int err;
if (!np) {
dev_err(&pdev->dev, "device node not found\n");
@@ -675,11 +672,12 @@ atmci_of_init(struct platform_device *pdev)
pdata->slot[slot_id].detect_pin =
devm_fwnode_gpiod_get(&pdev->dev, of_fwnode_handle(cnp),
"cd", GPIOD_IN, "cd-gpios");
- if (IS_ERR(pdata->slot[slot_id].detect_pin))
+ err = PTR_ERR_OR_ZERO(pdata->slot[slot_id].detect_pin);
+ if (err) {
+ if (err != -ENOENT)
+ return ERR_PTR(err);
pdata->slot[slot_id].detect_pin = NULL;
-
- pdata->slot[slot_id].detect_is_active_high =
- of_property_read_bool(cnp, "cd-inverted");
+ }
pdata->slot[slot_id].non_removable =
of_property_read_bool(cnp, "non-removable");
@@ -687,8 +685,12 @@ atmci_of_init(struct platform_device *pdev)
pdata->slot[slot_id].wp_pin =
devm_fwnode_gpiod_get(&pdev->dev, of_fwnode_handle(cnp),
"wp", GPIOD_IN, "wp-gpios");
- if (IS_ERR(pdata->slot[slot_id].wp_pin))
+ err = PTR_ERR_OR_ZERO(pdata->slot[slot_id].wp_pin);
+ if (err) {
+ if (err != -ENOENT)
+ return ERR_PTR(err);
pdata->slot[slot_id].wp_pin = NULL;
+ }
}
return pdata;
@@ -1566,8 +1568,7 @@ static int atmci_get_cd(struct mmc_host *mmc)
struct atmel_mci_slot *slot = mmc_priv(mmc);
if (slot->detect_pin) {
- present = !(gpiod_get_raw_value(slot->detect_pin) ^
- slot->detect_is_active_high);
+ present = gpiod_get_value_cansleep(slot->detect_pin);
dev_dbg(&mmc->class_dev, "card is %spresent\n",
present ? "" : "not ");
}
@@ -1680,8 +1681,7 @@ static void atmci_detect_change(struct timer_list *t)
return;
enable_irq(gpiod_to_irq(slot->detect_pin));
- present = !(gpiod_get_raw_value(slot->detect_pin) ^
- slot->detect_is_active_high);
+ present = gpiod_get_value_cansleep(slot->detect_pin);
present_old = test_bit(ATMCI_CARD_PRESENT, &slot->flags);
dev_vdbg(&slot->mmc->class_dev, "detect change: %d (was %d)\n",
@@ -2272,7 +2272,6 @@ static int atmci_init_slot(struct atmel_mci *host,
slot->host = host;
slot->detect_pin = slot_data->detect_pin;
slot->wp_pin = slot_data->wp_pin;
- slot->detect_is_active_high = slot_data->detect_is_active_high;
slot->sdc_reg = sdc_reg;
slot->sdio_irq = sdio_irq;
@@ -2280,7 +2279,7 @@ static int atmci_init_slot(struct atmel_mci *host,
"slot[%u]: bus_width=%u, detect_pin=%d, "
"detect_is_active_high=%s, wp_pin=%d\n",
id, slot_data->bus_width, desc_to_gpio(slot_data->detect_pin),
- slot_data->detect_is_active_high ? "true" : "false",
+ !gpiod_is_active_low(slot_data->detect_pin) ? "true" : "false",
desc_to_gpio(slot_data->wp_pin));
mmc->ops = &atmci_ops;
@@ -2318,10 +2317,8 @@ static int atmci_init_slot(struct atmel_mci *host,
/* Assume card is present initially */
set_bit(ATMCI_CARD_PRESENT, &slot->flags);
if (slot->detect_pin) {
- if (gpiod_get_raw_value(slot->detect_pin) ^
- slot->detect_is_active_high) {
+ if (!gpiod_get_value_cansleep(slot->detect_pin))
clear_bit(ATMCI_CARD_PRESENT, &slot->flags);
- }
} else {
dev_dbg(&mmc->class_dev, "no detect pin available\n");
}
--
2.25.1
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