linux-kernel - Re: [PATCH v15 3/4] i2c: muxes: pca954x: Add MAX735x/MAX736x support

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Date:   Sun, 20 Aug 2023 13:23:04 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Patrick Rudolph <patrick.rudolph@...ements.com>
Cc:     Peter Rosin <peda@...ntia.se>, 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 Patrick,

> 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>

2023?

One question, why are you adding yourself in the copyright?

>   * 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. */

I'm sorry, Peter already commented on this, can you please fix
the commenting?

		/*
		 * No interrupt controller support.
		 * The interrupt provides information
		 * about stuck channels.
		 */

Or

		/*
		 * No interrupt controller support. The interrupt
		 * provides information * about stuck channels.
		 */

to save one line. (I prefer the latter, your choice)

Rest looks good.

Andi

> +	},
> +	[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] },
> -- 
> 2.41.0
>