linux-kernel - Re: [PATCH v3 3/3] i2c: mpc: Use i2c-scl-clk-low-timeout-ms i2c property

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Message-ID: <f3d6760d-f2cc-c725-d7fb-6056ee555b65@alliedtelesis.co.nz>
Date:   Mon, 13 Mar 2023 01:53:23 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     Andi Shyti <andi.shyti@...nel.org>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Wolfram Sang <wsa@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        Ryan Chen <ryan_chen@...eedtech.com>
Subject: Re: [PATCH v3 3/3] i2c: mpc: Use i2c-scl-clk-low-timeout-ms i2c
 property


On 13/03/23 12:36, Andi Shyti wrote:
> "fsl,timeout" is marked as deprecated and replaced by the
> "i2c-scl-clk-low-timeout-ms" i2c property.
>
> Use this latter and, in case it is missing, for back
> compatibility, check whether we still have "fsl,timeout" defined.
>
> Signed-off-by: Andi Shyti <andi.shyti@...nel.org>
> Reviewed-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
Gave the patches a spin on a P2041RDB so

Tested-by: Chris Packham <chris.packham@...iedtelesis.co.nz>

> ---
>   drivers/i2c/busses/i2c-mpc.c | 12 +++++++++++-
>   1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
> index 87e5c1725750..28f11e30ac50 100644
> --- a/drivers/i2c/busses/i2c-mpc.c
> +++ b/drivers/i2c/busses/i2c-mpc.c
> @@ -843,8 +843,18 @@ static int fsl_i2c_probe(struct platform_device *op)
>   			mpc_i2c_setup_8xxx(op->dev.of_node, i2c, clock);
>   	}
>   
> +	/*
> +	 * "fsl,timeout" has been marked as deprecated and, to maintain
> +	 * backward compatibility, we will only look for it if
> +	 * "i2c-scl-clk-low-timeout-ms" is not present.
> +	 */
>   	result = of_property_read_u32(op->dev.of_node,
> -				      "fsl,timeout", &mpc_ops.timeout);
> +				      "i2c-scl-clk-low-timeout-ms",
> +				      &mpc_ops.timeout);
> +	if (result == -EINVAL)
> +		result = of_property_read_u32(op->dev.of_node,
> +					      "fsl,timeout", &mpc_ops.timeout);
> +
>   	if (!result) {
>   		mpc_ops.timeout *= HZ / 1000000;
>   		if (mpc_ops.timeout < 5)