[U-Boot] [PATCH v3 4/6] drivers/i2c/muxes/pca954x: Add pca9547 I2C mux support

[Heiko Schocher <hs@denx.de>]

Hello Marek,

Am 06.06.2017 um 14:04 schrieb Marek Behun:
> From: Marek Behún <marek.behun@nic.cz>
>
> This I2C mux is found, for example, on the Turris Omnia board.
>
> Signed-off-by: Marek Behun <marek.behun@nic.cz>

Reviewed-by: Heiko Schocher <hs@denx.de>

bye,
Heiko
>
> diff --git a/drivers/i2c/muxes/pca954x.c b/drivers/i2c/muxes/pca954x.c
> index 1a6761858c..383f72f552 100644
> --- a/drivers/i2c/muxes/pca954x.c
> +++ b/drivers/i2c/muxes/pca954x.c
> @@ -13,11 +13,40 @@
>
>   DECLARE_GLOBAL_DATA_PTR;
>
> +enum pca_type {
> +	PCA9544,
> +	PCA9547,
> +	PCA9548
> +};
> +
> +struct chip_desc {
> +	u8 enable;
> +	enum muxtype {
> +		pca954x_ismux = 0,
> +		pca954x_isswi,
> +	} muxtype;
> +};
> +
>   struct pca954x_priv {
>   	u32 addr; /* I2C mux address */
>   	u32 width; /* I2C mux width - number of busses */
>   };
>
> +static const struct chip_desc chips[] = {
> +	[PCA9544] = {
> +		.enable = 0x4,
> +		.muxtype = pca954x_ismux,
> +	},
> +	[PCA9547] = {
> +		.enable = 0x8,
> +		.muxtype = pca954x_ismux,
> +	},
> +	[PCA9548] = {
> +		.enable = 0x8,
> +		.muxtype = pca954x_isswi,
> +	},
> +};
> +
>   static int pca954x_deselect(struct udevice *mux, struct udevice *bus,
>   			    uint channel)
>   {
> @@ -31,7 +60,13 @@ static int pca954x_select(struct udevice *mux, struct udevice *bus,
>   			  uint channel)
>   {
>   	struct pca954x_priv *priv = dev_get_priv(mux);
> -	uchar byte = 1 << channel;
> +	const struct chip_desc *chip = &chips[dev_get_driver_data(mux)];
> +	uchar byte;
> +
> +	if (chip->muxtype == pca954x_ismux)
> +		byte = channel | chip->enable;
> +	else
> +		byte = 1 << channel;
>
>   	return dm_i2c_write(mux, priv->addr, &byte, 1);
>   }
> @@ -42,8 +77,9 @@ static const struct i2c_mux_ops pca954x_ops = {
>   };
>
>   static const struct udevice_id pca954x_ids[] = {
> -	{ .compatible = "nxp,pca9548", .data = (ulong)8 },
> -	{ .compatible = "nxp,pca9544", .data = (ulong)4 },
> +	{ .compatible = "nxp,pca9544", .data = PCA9544 },
> +	{ .compatible = "nxp,pca9547", .data = PCA9547 },
> +	{ .compatible = "nxp,pca9548", .data = PCA9548 },
>   	{ }
>   };
>
>

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