[PATCH v1] i2c: muxes: pca954x: Add MAX735x/MAX736x support

[bigunclemax at gmail.com]

From: Maksim Kiselev <bigunclemax at gmail.com>

Add support for the following Maxim chips using the existing PCA954x
driver:
- MAX7356
- MAX7357
- MAX7358
- MAX7367
- MAX7368
- MAX7369

All added Maxim chips behave like the PCA954x, where a single SMBUS byte
write selects up to 8 channels to be bridged to the primary bus.

Tested using the MAX7358.

Signed-off-by: Maksim Kiselev <bigunclemax at gmail.com>
---
Hi, friends!

I have a custom board with MAX7358 GPIO expander.
This patch is the port of Linux commit:
 > 81694437b6eb i2c: muxes: pca954x: Add MAX735x/MAX736x support

Best wishes, Maksim.

 drivers/i2c/muxes/Kconfig   |  5 +++++
 drivers/i2c/muxes/pca954x.c | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig
index 323c4fbe9c..cd5579aa55 100644
--- a/drivers/i2c/muxes/Kconfig
+++ b/drivers/i2c/muxes/Kconfig
@@ -36,6 +36,11 @@ config I2C_MUX_PCA954x
 	  device. Supported chips are PCA9543, PCA9544, PCA9546, PCA9547,
 	  PCA9548 and PCA9646.
 
+	  It's also compatible to Maxims MAX735x I2C switch chips, which are controlled
+	  as the NXP PCA9548 and the MAX736x chips that act like the PCA9544.
+	  This includes the:
+		MAX7356, MAX7357, MAX7358, MAX7367, MAX7368 and MAX7369
+
 config I2C_MUX_GPIO
         tristate "GPIO-based I2C multiplexer"
 	depends on I2C_MUX && DM_GPIO
diff --git a/drivers/i2c/muxes/pca954x.c b/drivers/i2c/muxes/pca954x.c
index 795288fe2e..9dd2697270 100644
--- a/drivers/i2c/muxes/pca954x.c
+++ b/drivers/i2c/muxes/pca954x.c
@@ -14,6 +14,12 @@
 #include <asm-generic/gpio.h>
 
 enum pca_type {
+	MAX7356,
+	MAX7357,
+	MAX7358,
+	MAX7367,
+	MAX7368,
+	MAX7369,
 	PCA9543,
 	PCA9544,
 	PCA9546,
@@ -39,6 +45,31 @@ struct pca954x_priv {
 };
 
 static const struct chip_desc chips[] = {
+	[MAX7356] = {
+		.muxtype = pca954x_isswi,
+		.width = 8,
+	},
+	[MAX7357] = {
+		.muxtype = pca954x_isswi,
+		.width = 8,
+	},
+	[MAX7358] = {
+		.muxtype = pca954x_isswi,
+		.width = 8,
+	},
+	[MAX7367] = {
+		.muxtype = pca954x_isswi,
+		.width = 4,
+	},
+	[MAX7368] = {
+		.muxtype = pca954x_isswi,
+		.width = 4,
+	},
+	[MAX7369] = {
+		.enable = 0x4,
+		.muxtype = pca954x_ismux,
+		.width = 4,
+	},
 	[PCA9543] = {
 		.muxtype = pca954x_isswi,
 		.width = 2,
@@ -102,6 +133,12 @@ static const struct i2c_mux_ops pca954x_ops = {
 };
 
 static const struct udevice_id pca954x_ids[] = {
+	{ .compatible = "maxim,max7356", .data = MAX7356 },
+	{ .compatible = "maxim,max7357", .data = MAX7357 },
+	{ .compatible = "maxim,max7358", .data = MAX7358 },
+	{ .compatible = "maxim,max7367", .data = MAX7367 },
+	{ .compatible = "maxim,max7368", .data = MAX7368 },
+	{ .compatible = "maxim,max7369", .data = MAX7369 },
 	{ .compatible = "nxp,pca9543", .data = PCA9543 },
 	{ .compatible = "nxp,pca9544", .data = PCA9544 },
 	{ .compatible = "nxp,pca9546", .data = PCA9546 },
-- 
2.45.2