[PATCH 3/9] pinctrl: stm32: Introduce HDP driver

[Clement LE GOFFIC]

On 2/25/25 13:59, Krzysztof Kozlowski wrote:
> On 25/02/2025 09:48, Clément Le Goffic wrote:
>> This patch introduce the driver for the Hardware Debug Port available on
> 
> Please do not use "This commit/patch/change", but imperative mood. See
> longer explanation here:
> https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95

Ok

> 
>> STM32MP platforms. The HDP allows the observation of internal SoC
>> signals by using multiplexers. Each HDP port can provide up to 16
>> internal signals (one of them can be software controlled as a GPO)
> 
> 
> 
> ....
> 
>> +
>> +static int stm32_hdp_suspend(struct device *dev)
>> +{
>> +	struct stm32_hdp *hdp = dev_get_drvdata(dev);
>> +
>> +	hdp->gposet_conf = readl_relaxed(hdp->base + HDP_GPOSET);
>> +
>> +	pinctrl_pm_select_sleep_state(dev);
>> +
>> +	clk_disable_unprepare(hdp->clk);
>> +
>> +	return 0;
>> +}
>> +
>> +static int stm32_hdp_resume(struct device *dev)
>> +{
>> +	struct stm32_hdp *hdp = dev_get_drvdata(dev);
>> +	int err;
>> +
>> +	err = clk_prepare_enable(hdp->clk);
>> +	if (err)
>> +		return dev_err_probe(hdp->dev, err, "Failed to prepare_enable clk");
> 
> 
> That's wrong, it is not a probe path.

Indeed

> 
>> +
>> +	writel_relaxed(HDP_CTRL_ENABLE, hdp->base + HDP_CTRL);
>> +	writel_relaxed(hdp->gposet_conf, hdp->base + HDP_GPOSET);
>> +	writel_relaxed(hdp->mux_conf, hdp->base + HDP_MUX);
>> +
>> +	pinctrl_pm_select_default_state(dev);
>> +
>> +	return 0;
>> +}
>> +
>> +DEFINE_SIMPLE_DEV_PM_OPS(stm32_hdp_pm_ops, stm32_hdp_suspend, stm32_hdp_resume);
>> +
>> +static struct platform_driver stm32_hdp_driver = {
>> +	.probe = stm32_hdp_probe,
>> +	.remove = stm32_hdp_remove,
>> +	.driver = {
>> +		.name = DRIVER_NAME,
>> +		.pm = pm_sleep_ptr(&stm32_hdp_pm_ops),
>> +		.of_match_table = stm32_hdp_of_match,
>> +	}
>> +};
>> +
>> +module_platform_driver(stm32_hdp_driver);
>> +
>> +MODULE_ALIAS("platform:" DRIVER_NAME);
> 
> 
> You should not need MODULE_ALIAS() in normal cases. If you need it,
> usually it means your device ID table is wrong (e.g. misses either
> entries or MODULE_DEVICE_TABLE()). MODULE_ALIAS() is not a substitute
> for incomplete ID table.
> 

Ok

> 
> 
> Best regards,
> Krzysztof

Best regards,

Clément