linux-kernel - Re: [PATCH] drivers: thermal: tsens: Work with old DTBs

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Message-ID: <aa9174c2-c851-4769-0f9c-5541047a7901@linaro.org>
Date:   Wed, 11 Dec 2019 16:09:28 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Amit Kucheria <amit.kucheria@...aro.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        bjorn.andersson@...aro.org, agross@...nel.org, swboyd@...omium.org,
        stephan@...hold.net, olof@...om.net
Cc:     linux-pm@...r.kernel.org
Subject: Re: [PATCH] drivers: thermal: tsens: Work with old DTBs

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@...aro.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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