linux-kernel - [PATCH] NFC: nxp-nci: Make firmware GPIO pin optional

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Message-Id: <20201130110447.16891-1-frieder.schrempf@kontron.de>
Date:   Mon, 30 Nov 2020 12:04:42 +0100
From:   Schrempf Frieder <frieder.schrempf@...tron.de>
To:     Charles Gorand <charles.gorand@...innov.com>,
        Clément Perrochaud 
        <clement.perrochaud@...innov.com>,
        Frieder Schrempf <frieder.schrempf@...tron.de>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-nfc@...ts.01.org, netdev@...r.kernel.org,
        Stephan Gerhold <stephan@...hold.net>
Subject: [PATCH] NFC: nxp-nci: Make firmware GPIO pin optional

From: Frieder Schrempf <frieder.schrempf@...tron.de>

There are other NXP NCI compatible NFC controllers such as the PN7150
that use an integrated firmware and therefore do not have a GPIO to
select firmware downloading mode. To support these kind of chips,
let's make the firmware GPIO optional.

Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
---
 Documentation/devicetree/bindings/net/nfc/nxp-nci.txt | 2 +-
 drivers/nfc/nxp-nci/i2c.c                             | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/nfc/nxp-nci.txt b/Documentation/devicetree/bindings/net/nfc/nxp-nci.txt
index cfaf88998918..cb2385c277d0 100644
--- a/Documentation/devicetree/bindings/net/nfc/nxp-nci.txt
+++ b/Documentation/devicetree/bindings/net/nfc/nxp-nci.txt
@@ -6,11 +6,11 @@ Required properties:
 - reg: address on the bus
 - interrupts: GPIO interrupt to which the chip is connected
 - enable-gpios: Output GPIO pin used for enabling/disabling the chip
-- firmware-gpios: Output GPIO pin used to enter firmware download mode
 
 Optional SoC Specific Properties:
 - pinctrl-names: Contains only one value - "default".
 - pintctrl-0: Specifies the pin control groups used for this controller.
+- firmware-gpios: Output GPIO pin used to enter firmware download mode
 
 Example (for ARM-based BeagleBone with NPC100 NFC controller on I2C2):
 
diff --git a/drivers/nfc/nxp-nci/i2c.c b/drivers/nfc/nxp-nci/i2c.c
index 9f60e4dc5a90..528893686e18 100644
--- a/drivers/nfc/nxp-nci/i2c.c
+++ b/drivers/nfc/nxp-nci/i2c.c
@@ -47,7 +47,8 @@ static int nxp_nci_i2c_set_mode(void *phy_id,
 {
 	struct nxp_nci_i2c_phy *phy = (struct nxp_nci_i2c_phy *) phy_id;
 
-	gpiod_set_value(phy->gpiod_fw, (mode == NXP_NCI_MODE_FW) ? 1 : 0);
+	if (phy->gpiod_fw)
+		gpiod_set_value(phy->gpiod_fw, (mode == NXP_NCI_MODE_FW) ? 1 : 0);
 	gpiod_set_value(phy->gpiod_en, (mode != NXP_NCI_MODE_COLD) ? 1 : 0);
 	usleep_range(10000, 15000);
 
@@ -286,7 +287,7 @@ static int nxp_nci_i2c_probe(struct i2c_client *client,
 		return PTR_ERR(phy->gpiod_en);
 	}
 
-	phy->gpiod_fw = devm_gpiod_get(dev, "firmware", GPIOD_OUT_LOW);
+	phy->gpiod_fw = devm_gpiod_get_optional(dev, "firmware", GPIOD_OUT_LOW);
 	if (IS_ERR(phy->gpiod_fw)) {
 		nfc_err(dev, "Failed to get FW gpio\n");
 		return PTR_ERR(phy->gpiod_fw);
-- 
2.17.1