linux-kernel - [PATCH v3] NFC: nxp-nci: Make firmware GPIO pin optional

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Message-Id: <20201201113921.6572-1-frieder.schrempf@kontron.de>
Date:   Tue,  1 Dec 2020 12:39:09 +0100
From:   Schrempf Frieder <frieder.schrempf@...tron.de>
To:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Charles Gorand <charles.gorand@...innov.com>,
        Frieder Schrempf <frieder.schrempf@...tron.de>
Cc:     "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 v3] 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 this kind of controller,
let's make the firmware GPIO optional.

Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

---
Changes in v2:
  * Remove unneeded null check for phy->gpiod_fw

Changes in v3:
  * Improve commit message
  * Add Andy's R-b tag
---
 Documentation/devicetree/bindings/net/nfc/nxp-nci.txt | 2 +-
 drivers/nfc/nxp-nci/i2c.c                             | 2 +-
 2 files changed, 2 insertions(+), 2 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..7e451c10985d 100644
--- a/drivers/nfc/nxp-nci/i2c.c
+++ b/drivers/nfc/nxp-nci/i2c.c
@@ -286,7 +286,7 @@ 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