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Subject: Re: [PATCH] drivers: thermal: tsens: Work with old DTBs
To:     Amit Kucheria <amit.kucheria@linaro.org>,
        linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        bjorn.andersson@linaro.org, agross@kernel.org, swboyd@chromium.org,
        stephan@gerhold.net, olof@lixom.net
Cc:     linux-pm@vger.kernel.org
References: <cover.1576058136.git.amit.kucheria@linaro.org>
 <39d6b8e4b2cc5836839cfae7cdf0ee3470653b64.1576058136.git.amit.kucheria@linaro.org>
From:   Daniel Lezcano <daniel.lezcano@linaro.org>
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Message-ID: <aa9174c2-c851-4769-0f9c-5541047a7901@linaro.org>
Date:   Wed, 11 Dec 2019 16:09:28 +0100
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Sender: linux-kernel-owner@vger.kernel.org
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On 11/12/2019 10:58, Amit Kucheria wrote:
> In order for the old DTBs to continue working, the new interrupt code
> must not return an error if interrupts are not defined.
> 
> Fixes: 634e11d5b450a ("drivers: thermal: tsens: Add interrupt support")
> Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
> ---
>  drivers/thermal/qcom/tsens.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c
> index 015e7d2015985..d8f51067ed411 100644
> --- a/drivers/thermal/qcom/tsens.c
> +++ b/drivers/thermal/qcom/tsens.c
> @@ -109,7 +109,7 @@ static int tsens_register(struct tsens_priv *priv)
>  
>  	irq = platform_get_irq_byname(pdev, "uplow");
>  	if (irq < 0) {
> -		ret = irq;

'ret' remains uninitialized here.

> +		dev_warn(&pdev->dev, "Missing uplow irq in DT\n");
>  		goto err_put_device;
>  	}
>  
> @@ -118,7 +118,8 @@ static int tsens_register(struct tsens_priv *priv)
>  					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
>  					dev_name(&pdev->dev), priv);
>  	if (ret) {
> -		dev_err(&pdev->dev, "%s: failed to get irq\n", __func__);
> +		dev_warn(&pdev->dev, "%s: failed to get uplow irq\n", __func__);
> +		ret = 0;
>  		goto err_put_device;
>  	}

The code now is unable to make a distinction between an error in the DT
and the old DT :/

Why not version the DT?


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