linux-kernel - [PATCH 1/2] drivers: gpio: Add support for PCF8574T.

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Message-Id: <20250217-gpio-pcf8574t-v1-1-137e140df5fc@gmail.com>
Date: Mon, 17 Feb 2025 14:07:51 +0100
From: Tóth János via B4 Relay <devnull+gomba007.gmail.com@...nel.org>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, 
 Tóth János <gomba007@...il.com>
Subject: [PATCH 1/2] drivers: gpio: Add support for PCF8574T.

From: Tóth János <gomba007@...il.com>

Add support for the PCF8574T 8-bit I2C I/O expander.

The driver is tested with:
	+ tools/lsgpio
	+ tools/gpio-hammer
	+ some LEDs

[1] https://www.nxp.com/docs/en/data-sheet/PCF8574_PCF8574A.pdf

Signed-off-by: Tóth János <gomba007@...il.com>
---
 drivers/gpio/Kconfig        | 2 +-
 drivers/gpio/gpio-pcf857x.c | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 98b4d1633b25..d7cdc3cc1b00 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1193,7 +1193,7 @@ config GPIO_PCF857X
 	  Most of these parts are from NXP, though TI is a second source for
 	  some of them.  Compatible models include:
 
-	  8 bits:   pcf8574, pcf8574a, pca8574, pca8574a,
+	  8 bits:   pcf8574, pcf8574a, pcf8574t, pca8574, pca8574a,
 	            pca9670, pca9672, pca9674, pca9674a,
 	            max7328, max7329
 
diff --git a/drivers/gpio/gpio-pcf857x.c b/drivers/gpio/gpio-pcf857x.c
index 7c57eaeb0afe..2464c527a4e8 100644
--- a/drivers/gpio/gpio-pcf857x.c
+++ b/drivers/gpio/gpio-pcf857x.c
@@ -20,6 +20,7 @@
 static const struct i2c_device_id pcf857x_id[] = {
 	{ "pcf8574", 8 },
 	{ "pcf8574a", 8 },
+	{ "pcf8574t", 8 },
 	{ "pca8574", 8 },
 	{ "pca9670", 8 },
 	{ "pca9672", 8 },
@@ -38,6 +39,7 @@ MODULE_DEVICE_TABLE(i2c, pcf857x_id);
 static const struct of_device_id pcf857x_of_table[] = {
 	{ .compatible = "nxp,pcf8574", (void *)8 },
 	{ .compatible = "nxp,pcf8574a", (void *)8 },
+	{ .compatible = "nxp,pcf8574t", (void *)8 },
 	{ .compatible = "nxp,pca8574", (void *)8 },
 	{ .compatible = "nxp,pca9670", (void *)8 },
 	{ .compatible = "nxp,pca9672", (void *)8 },

-- 
2.34.1