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i2c: muxes: pca954x: Add MAX735x/MAX736x support

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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.

While the MAX7357/MAX7358 have interrupt support, they don't act as
interrupt controller like the PCA9545 does. Thus don't enable IRQ support
and handle them like the PCA9548.

Tested using the MAX7357.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Patrick Rudolph 2023-08-21 08:20:23 +02:00 committed by Wolfram Sang
parent dde2c69042
commit 81694437b6
2 changed files with 69 additions and 4 deletions
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6
drivers/i2c/muxes/Kconfig
View File

@ -65,11 +65,11 @@ config I2C_MUX_PCA9541
will be called i2c-mux-pca9541.
config I2C_MUX_PCA954x
tristate "NXP PCA954x and PCA984x I2C Mux/switches"
tristate "NXP PCA954x/PCA984x and Maxim MAX735x/MAX736x I2C Mux/switches"
depends on GPIOLIB || COMPILE_TEST
help
If you say yes here you get support for the NXP PCA954x
and PCA984x I2C mux/switch devices.
If you say yes here you get support for NXP PCA954x/PCA984x
and Maxim MAX735x/MAX736x I2C mux/switch devices.
This driver can also be built as a module. If so, the module
will be called i2c-mux-pca954x.

67
drivers/i2c/muxes/i2c-mux-pca954x.c
View File

@ -11,6 +11,12 @@
* PCA9540, PCA9542, PCA9543, PCA9544, PCA9545, PCA9546, PCA9547,
* PCA9548, PCA9846, PCA9847, PCA9848 and PCA9849.
*
* 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
*
* These chips are all controlled via the I2C bus itself, and all have a
* single 8-bit register. The upstream "parent" bus fans out to two,
* four, or eight downstream busses or channels; which of these
@ -51,6 +57,12 @@
#define PCA954X_IRQ_OFFSET 4
enum pca_type {
max_7356,
max_7357,
max_7358,
max_7367,
max_7368,
max_7369,
pca_9540,
pca_9542,
pca_9543,
@ -90,8 +102,49 @@ struct pca954x {
raw_spinlock_t lock;
};
/* Provide specs for the PCA954x types we know about */
/* Provide specs for the MAX735x, PCA954x and PCA984x types we know about */
static const struct chip_desc chips[] = {
[max_7356] = {
.nchans = 8,
.muxtype = pca954x_isswi,
.id = { .manufacturer_id = I2C_DEVICE_ID_NONE },
},
[max_7357] = {
.nchans = 8,
.muxtype = pca954x_isswi,
.id = { .manufacturer_id = I2C_DEVICE_ID_NONE },
/*
* No interrupt controller support. The interrupt
* provides information about stuck channels.
*/
},
[max_7358] = {
.nchans = 8,
.muxtype = pca954x_isswi,
.id = { .manufacturer_id = I2C_DEVICE_ID_NONE },
/*
* No interrupt controller support. The interrupt
* provides information about stuck channels.
*/
},
[max_7367] = {
.nchans = 4,
.muxtype = pca954x_isswi,
.has_irq = 1,
.id = { .manufacturer_id = I2C_DEVICE_ID_NONE },
},
[max_7368] = {
.nchans = 4,
.muxtype = pca954x_isswi,
.id = { .manufacturer_id = I2C_DEVICE_ID_NONE },
},
[max_7369] = {
.nchans = 4,
.enable = 0x4,
.muxtype = pca954x_ismux,
.has_irq = 1,
.id = { .manufacturer_id = I2C_DEVICE_ID_NONE },
},
[pca_9540] = {
.nchans = 2,
.enable = 0x4,
@ -177,6 +230,12 @@ static const struct chip_desc chips[] = {
};
static const struct i2c_device_id pca954x_id[] = {
{ "max7356", max_7356 },
{ "max7357", max_7357 },
{ "max7358", max_7358 },
{ "max7367", max_7367 },
{ "max7368", max_7368 },
{ "max7369", max_7369 },
{ "pca9540", pca_9540 },
{ "pca9542", pca_9542 },
{ "pca9543", pca_9543 },
@ -194,6 +253,12 @@ static const struct i2c_device_id pca954x_id[] = {
MODULE_DEVICE_TABLE(i2c, pca954x_id);
static const struct of_device_id pca954x_of_match[] = {
{ .compatible = "maxim,max7356", .data = &chips[max_7356] },
{ .compatible = "maxim,max7357", .data = &chips[max_7357] },
{ .compatible = "maxim,max7358", .data = &chips[max_7358] },
{ .compatible = "maxim,max7367", .data = &chips[max_7367] },
{ .compatible = "maxim,max7368", .data = &chips[max_7368] },
{ .compatible = "maxim,max7369", .data = &chips[max_7369] },
{ .compatible = "nxp,pca9540", .data = &chips[pca_9540] },
{ .compatible = "nxp,pca9542", .data = &chips[pca_9542] },
{ .compatible = "nxp,pca9543", .data = &chips[pca_9543] },