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

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Message-ID: <ec504c7d-66d4-a4b7-547e-7272e012cdf9@linaro.org>
Date:   Tue, 14 Mar 2023 15:22:52 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andi Shyti <andi.shyti@...nel.org>, linux-i2c@...r.kernel.org,
        devicetree@...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>,
        Chris Packham <chris.packham@...iedtelesis.co.nz>,
        Ryan Chen <ryan_chen@...eedtech.com>
Subject: Re: [PATCH v3 3/3] i2c: mpc: Use i2c-scl-clk-low-timeout-ms i2c
 property

On 13/03/2023 00:36, 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>
> ---
>  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);

Wasn't old property in us and new one is in ms?

Best regards,
Krzysztof