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Message-ID: <1a16242a-36e8-6e12-1ad6-31e8e984b3c2@axentia.se>
Date: Thu, 17 Aug 2023 18:22:31 +0200
From: Peter Rosin <peda@...ntia.se>
To: Patrick Rudolph <patrick.rudolph@...ements.com>
Cc: naresh.solanki@...ements.com, linux-i2c@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v15 3/4] i2c: muxes: pca954x: Add MAX735x/MAX736x support
Hi!
2023-08-17 at 09:10, Patrick Rudolph wrote:
> 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@...ements.com>
Acked-by: Peter Rosin <peda@...ntia.se>
/*
* However, if you find yourself doing a v16 for some reason, please
* update new multi-line comments to match the preferred coding style.
*/
Cheers,
Peter
> ---
> drivers/i2c/muxes/Kconfig | 6 +--
> drivers/i2c/muxes/i2c-mux-pca954x.c | 64 ++++++++++++++++++++++++++++-
> 2 files changed, 66 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig
> index ea838dbae32e..db1b9057612a 100644
> --- a/drivers/i2c/muxes/Kconfig
> +++ b/drivers/i2c/muxes/Kconfig
> @@ -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.
> diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c
> index 0ccee2ae5720..968111442625 100644
> --- a/drivers/i2c/muxes/i2c-mux-pca954x.c
> +++ b/drivers/i2c/muxes/i2c-mux-pca954x.c
> @@ -4,6 +4,7 @@
> *
> * Copyright (c) 2008-2009 Rodolfo Giometti <giometti@...ux.it>
> * Copyright (c) 2008-2009 Eurotech S.p.A. <info@...otech.it>
> + * Copyright (c) 2022 9elements GmbH <patrick.rudolph@...ements.com>
> *
> * This module supports the PCA954x and PCA984x series of I2C multiplexer/switch
> * chips made by NXP Semiconductors.
> @@ -11,6 +12,12 @@
> * 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 +58,12 @@
> #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 +103,45 @@ 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 +227,12 @@ 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 +250,12 @@ 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] },
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