[PATCH 4/6] thermal: renesas: rzg3s: Add thermal driver for the Renesas RZ/G3S SoC

[Claudiu Beznea]

On 25.01.2025 14:18, Jonathan Cameron wrote:
> On Wed, 22 Jan 2025 11:29:19 +0100
> Geert Uytterhoeven <geert at linux-m68k.org> wrote:
> 
>> Hi Claudiu,
>>
>> CC iio
>>
>> On Fri, Jan 3, 2025 at 5:38 PM Claudiu <claudiu.beznea at tuxon.dev> wrote:
>>> From: Claudiu Beznea <claudiu.beznea.uj at bp.renesas.com>
>>>
>>> The Renesas RZ/G3S SoC features a Thermal Sensor Unit (TSU) that reports
>>> the junction temperature. The temperature is reported through a dedicated
>>> ADC channel. Add a driver for the Renesas RZ/G3S TSU.
>>>
>>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj at bp.renesas.com>  
>>
>> Thanks for your patch!
>>
>>> --- /dev/null
>>> +++ b/drivers/thermal/renesas/rzg3s_thermal.c  
>>
>>> +static int rzg3s_thermal_probe(struct platform_device *pdev)
>>> +{
>>> +       struct rzg3s_thermal_priv *priv;
>>> +       struct device *dev = &pdev->dev;
>>> +       int ret;
>>> +
>>> +       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
>>> +       if (!priv)
>>> +               return -ENOMEM;
>>> +
>>> +       priv->base = devm_platform_ioremap_resource(pdev, 0);
>>> +       if (IS_ERR(priv->base))
>>> +               return PTR_ERR(priv->base);
>>> +
>>> +       priv->channel = devm_iio_channel_get(dev, "tsu");  
>>
>> Given there's only a single IIO channel, you could pass NULL instead
>> of the name, and drop "io-channel-names" from the DT bindings.
>> I don't know what's the IIO policy w.r.t. unnamed channels, though.
> 
> It's supported, so fine as long as no future additional names show up.
> Will just fallback to index 0 I think.

If everyone agrees, I would keep the name, too, to avoid complications in
case this IP variant will be extended on future SoCs.

Thank you,
Claudiu

> 
> Jonathan
> 
>>
>>> +       if (IS_ERR(priv->channel))
>>> +               return dev_err_probe(dev, PTR_ERR(priv->channel), "Failed to get IIO channel!\n");
>>> +
>>> +       priv->rstc = devm_reset_control_get_exclusive_deasserted(dev, NULL);
>>> +       if (IS_ERR(priv->rstc))
>>> +               return dev_err_probe(dev, PTR_ERR(priv->rstc), "Failed to get reset!\n");
>>> +
>>> +       priv->dev = dev;
>>> +       priv->mode = THERMAL_DEVICE_DISABLED;
>>> +       platform_set_drvdata(pdev, priv);
>>> +
>>> +       pm_runtime_set_autosuspend_delay(dev, 300);
>>> +       pm_runtime_use_autosuspend(dev);
>>> +       pm_runtime_enable(dev);
>>> +
>>> +       ret = rzg3s_thermal_read_calib(priv);
>>> +       if (ret) {
>>> +               dev_err_probe(dev, ret, "Failed to read calibration data!\n");
>>> +               goto rpm_disable;
>>> +       }
>>> +
>>> +       priv->tz = thermal_of_zone_register(dev->of_node, 0, priv, &rzg3s_tz_of_ops);
>>> +       if (IS_ERR(priv->tz)) {
>>> +               dev_err_probe(dev, PTR_ERR(priv->tz), "Failed to register thermal zone!\n");
>>> +               goto rpm_disable;
>>> +       }
>>> +
>>> +       ret = thermal_add_hwmon_sysfs(priv->tz);
>>> +       if (ret) {
>>> +               dev_err_probe(dev, ret, "Failed to add hwmon sysfs!\n");
>>> +               goto tz_unregister;
>>> +       }
>>> +
>>> +       return 0;
>>> +
>>> +tz_unregister:
>>> +       thermal_of_zone_unregister(priv->tz);
>>> +rpm_disable:
>>> +       pm_runtime_disable(dev);
>>> +       pm_runtime_dont_use_autosuspend(dev);
>>> +       return ret;
>>> +}  
>>
>> Gr{oetje,eeting}s,
>>
>>                         Geert
>>
>> --
>> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org
>>
>> In personal conversations with technical people, I call myself a hacker. But
>> when I'm talking to journalists I just say "programmer" or something like that.
>>                                 -- Linus Torvalds
>>
>