linux-kernel - Re: [PATCH v5 15/18] thermal: sun8i: allow to use custom temperature calculation function

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Date:   Mon, 12 Aug 2019 10:49:15 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Yangtao Li <tiny.windzz@...il.com>
Cc:     rui.zhang@...el.com, edubezval@...il.com,
        daniel.lezcano@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, wens@...e.org, mchehab+samsung@...nel.org,
        davem@...emloft.net, gregkh@...uxfoundation.org,
        Jonathan.Cameron@...wei.com, nicolas.ferre@...rochip.com,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Icenowy Zheng <icenowy@...c.io>
Subject: Re: [PATCH v5 15/18] thermal: sun8i: allow to use custom temperature
 calculation function

Hi,

On Sat, Aug 10, 2019 at 05:28:26AM +0000, Yangtao Li wrote:
> From: Icenowy Zheng <icenowy@...c.io>
>
> The H5 temperature calculation function is strange. Firstly, it's
> segmented. Secondly, the formula of two sensors are different in the
> second segment.
>
> Allow to use a custom temperature calculation function, in case of
> the function is complex.
>
> Signed-off-by: Icenowy Zheng <icenowy@...c.io>

When you send a patch on someone else's behalf, you need to put your
Signed-off-by as well.

> ---
>  drivers/thermal/sun8i_thermal.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
> index 3259081da841..a761e2afda08 100644
> --- a/drivers/thermal/sun8i_thermal.c
> +++ b/drivers/thermal/sun8i_thermal.c
> @@ -76,6 +76,7 @@ struct ths_thermal_chip {
>  				     u16 *caldata, int callen);
>  	int		(*init)(struct ths_device *tmdev);
>  	int             (*irq_ack)(struct ths_device *tmdev);
> +	int		(*calc_temp)(int id, int reg);
>  };
>
>  struct ths_device {
> @@ -90,9 +91,12 @@ struct ths_device {
>
>  /* Temp Unit: millidegree Celsius */
>  static int sun8i_ths_reg2temp(struct ths_device *tmdev,
> -			      int reg)
> +			      int id, int reg)
>  {
> -	return (reg + tmdev->chip->offset) * tmdev->chip->scale;
> +	if (tmdev->chip->calc_temp)
> +		return tmdev->chip->calc_temp(id, reg);
> +	else
> +		return (reg + tmdev->chip->offset) * tmdev->chip->scale;

You're not consistent here compared to the other callbacks you have
introduced: calibrate, init and irq_ack all need to be set and will
fail (hard) if you don't set them, yet this one will have a different
behaviour (that behaviour being to use the H6 formula, which is the
latest SoC, which is a bit odd in itself).

I guess we should either make it mandatory as the rest of the
callbacks, or document which callbacks are mandatory and which are
optional (and the behaviour when it's optional).

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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