linux-kernel - [linux][PATCH] pinctrl: at91-pio4: Add push-pull drive configuration

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Date:   Wed, 12 Apr 2023 10:51:46 -0700
From:   <Ryan.Wanner@...rochip.com>
To:     <ludovic.desroches@...rochip.com>, <linus.walleij@...aro.org>,
        <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <claudiu.beznea@...rochip.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Ryan Wanner <Ryan.Wanner@...rochip.com>
Subject: [linux][PATCH] pinctrl: at91-pio4: Add push-pull drive configuration

From: Ryan Wanner <Ryan.Wanner@...rochip.com>

The PIO4 does support push-pull configuration as this is the default
state of the open-drain register. Adapt the driver for this.

Signed-off-by: Ryan Wanner <Ryan.Wanner@...rochip.com>
---
This patch also fixes the warning of unsupported
configuration param 8.

This was tested on both sama5d2-som1-ek and sama7g5ek. I used dbg_show
fucntion to test if the configuration was correct when adding
drive-open-drain or drive-push-pull to the dts file.

 drivers/pinctrl/pinctrl-at91-pio4.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
index a30c6f7c9016..9a0cddfeaf92 100644
--- a/drivers/pinctrl/pinctrl-at91-pio4.c
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -776,6 +776,11 @@ static int atmel_conf_pin_config_group_get(struct pinctrl_dev *pctldev,
 			return -EINVAL;
 		arg = 1;
 		break;
+	case PIN_CONFIG_DRIVE_PUSH_PULL:
+		if ((res & ATMEL_PIO_OPD_MASK))
+			return -EINVAL;
+		arg = 1;
+		break;
 	case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 		if (!(res & ATMEL_PIO_SCHMITT_MASK))
 			return -EINVAL;
@@ -839,10 +844,10 @@ static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
 			conf &= (~ATMEL_PIO_PUEN_MASK);
 			break;
 		case PIN_CONFIG_DRIVE_OPEN_DRAIN:
-			if (arg == 0)
-				conf &= (~ATMEL_PIO_OPD_MASK);
-			else
-				conf |= ATMEL_PIO_OPD_MASK;
+			conf |= ATMEL_PIO_OPD_MASK;
+			break;
+		case PIN_CONFIG_DRIVE_PUSH_PULL:
+			conf &= (~ATMEL_PIO_OPD_MASK);
 			break;
 		case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 			if (arg == 0)
@@ -937,8 +942,10 @@ static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev,
 		seq_printf(s, "%s ", "pull-down");
 	if (conf & ATMEL_PIO_IFEN_MASK)
 		seq_printf(s, "%s ", "debounce");
-	if (conf & ATMEL_PIO_OPD_MASK)
+	if ((conf & ATMEL_PIO_OPD_MASK) > 0)
 		seq_printf(s, "%s ", "open-drain");
+	if ((conf & ATMEL_PIO_OPD_MASK) == 0)
+		seq_printf(s, "%s ", "push-pull");
 	if (conf & ATMEL_PIO_SCHMITT_MASK)
 		seq_printf(s, "%s ", "schmitt");
 	if (atmel_pioctrl->slew_rate_support && (conf & ATMEL_PIO_SR_MASK))
-- 
2.37.2