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From: vitor <vitor.soares@synopsys.com>
To: Przemyslaw Gaj <pgaj@cadence.com>, <bbrezillon@kernel.org>
Cc: linux-i3c@lists.infradead.org, rafalc@cadence.com,
	vitor.soares@synopsys.com
Subject: Re: [PATCH v2 1/3] i3c: Drop support for I2C 10 bit addresing
Date: Wed, 27 Feb 2019 12:05:30 +0000
Message-ID: <7607a23a-725d-b45a-a221-8a48bda301bd@synopsys.com> (raw)
In-Reply-To: <20190226142846.28294-2-pgaj@cadence.com>



On 26/02/19 14:28, Przemyslaw Gaj wrote:
> This patch dropps support for I2C devices with 10 bit addressing. When I2C
> device with 10 bit address is defined in DT, I3C master registration fails.
>
> Signed-off-by: Przemyslaw Gaj <pgaj@cadence.com>
>
> ---
>
> Main changes between v1 and v2 are:
> - Add error message when registering I2C device with 10 bit address.
>
> ---
>  drivers/i3c/master.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> index 2dc628d..8c1e365 100644
> --- a/drivers/i3c/master.c
> +++ b/drivers/i3c/master.c
> @@ -1962,6 +1962,15 @@ of_i3c_master_add_i2c_boardinfo(struct i3c_master_controller *master,
>  	if (ret)
>  		return ret;
>  
> +	/* The I3C Specification does not clearly say I2C devices with 10-bit
> +	 * address are supported. These devices can't be passed properly through
> +	 * DEFSLVS command.
> +	 */

IMO we just need to say 10-bit address not used or not supported in i3c.

> +	if (boardinfo->base.flags & I2C_CLIENT_TEN) {
> +		dev_err(&master->dev, "I2C device with 10 bit address not supported.");
> +		return -ENOTSUPP;
> +	}
> +
>  	/* LVR is encoded in reg[2]. */
>  	boardinfo->lvr = reg[2];
>  

Also need to change:

#define I2C_MAX_ADDR            GENMASK(9, 0)
to
#define I2C_MAX_ADDR            GENMASK(6, 0)
in master.h file

Not sure about:
unsigned long addrslots[((I2C_MAX_ADDR + 1) * 2) / BITS_PER_LONG];
@Boris can you check this part?

Best regards,
Vitor Soares

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Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-26 14:28 [PATCH v2 0/3] Drop support for I2C 10 bit devices from I3C subsystem Przemyslaw Gaj
2019-02-26 14:28 ` [PATCH v2 1/3] i3c: Drop support for I2C 10 bit addresing Przemyslaw Gaj
2019-02-27 12:05   ` vitor [this message]
2019-02-27 12:10     ` Boris Brezillon
2019-02-27 12:52       ` vitor
2019-02-27 13:09         ` Boris Brezillon
2019-02-26 14:28 ` [PATCH v2 2/3] i3c: master: cdns: Drop support for I2C 10 bit addresing in Cadence I3C master Przemyslaw Gaj
2019-02-26 14:28 ` [PATCH v2 3/3] dt-bindings: i3c: Document dropped support for I2C 10 bit devices Przemyslaw Gaj

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