linux-kernel - Re: [PATCH v1 25/33] ata/drivers/ahci

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Message-ID: <e8f91504-2b2d-76b9-cfe3-8f027824854f@opensource.wdc.com>
Date:   Mon, 11 Jul 2022 19:37:19 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Daniel Lezcano <daniel.lezcano@...exp.org>, rafael@...nel.org
Cc:     rui.zhang@...el.com, khilman@...libre.com, abailon@...libre.com,
        amitk@...nel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 25/33] ata/drivers/ahci_imx: Switch to new of thermal
 API

On 7/11/22 18:14, Daniel Lezcano wrote:
> On 11/07/2022 01:18, Damien Le Moal wrote:
>> On 7/11/22 06:24, Daniel Lezcano wrote:
>>> The thermal OF code has a new API allowing to migrate the OF
>>> initialization to a simpler approach.
>>>
>>> Use this new API.
>>>
>>> Signed-off-by: Daniel Lezcano <daniel.lezcano@...exp.org>
>>> ---
>>>   drivers/ata/ahci_imx.c | 15 ++++++++++-----
>>>   1 file changed, 10 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/ata/ahci_imx.c b/drivers/ata/ahci_imx.c
>>> index 79aa9f285312..5ad9a890e71a 100644
>>> --- a/drivers/ata/ahci_imx.c
>>> +++ b/drivers/ata/ahci_imx.c
>>> @@ -327,7 +327,7 @@ static int read_adc_sum(void *dev, u16 rtune_ctl_reg, void __iomem * mmio)
>>>   }
>>>   
>>>   /* SATA AHCI temperature monitor */
>>> -static int sata_ahci_read_temperature(void *dev, int *temp)
>>> +static int __sata_ahci_read_temperature(void *dev, int *temp)
>>>   {
>>>   	u16 mpll_test_reg, rtune_ctl_reg, dac_ctl_reg, read_sum;
>>>   	u32 str1, str2, str3, str4;
>>> @@ -416,6 +416,11 @@ static int sata_ahci_read_temperature(void *dev, int *temp)
>>>   	return 0;
>>>   }
>>>   
>>> +static int sata_ahci_read_temperature(struct thermal_zone_device *tz, int *temp)
>>> +{
>>> +	return __sata_ahci_read_temperature(tz->devdata, temp);
>>> +}
>>> +
>>>   static ssize_t sata_ahci_show_temp(struct device *dev,
>>>   				   struct device_attribute *da,
>>>   				   char *buf)
>>> @@ -423,14 +428,14 @@ static ssize_t sata_ahci_show_temp(struct device *dev,
>>>   	unsigned int temp = 0;
>>>   	int err;
>>>   
>>> -	err = sata_ahci_read_temperature(dev, &temp);
>>> +	err = __sata_ahci_read_temperature(dev, &temp);
>>>   	if (err < 0)
>>>   		return err;
>>>   
>>>   	return sprintf(buf, "%u\n", temp);
>>>   }
>>
>> I do not see why the above changes are necessary. Please explain.
> 
> sata_ahci_read_temperature() is used by sata_ahci_show_temp() also.
> 
> So in order to change the function prototype for the get_temp ops which 
> does not take a void* but a thermal_zone_device* structure, this 
> function wraps the call.
> 
> Do you prefer sata_ahci_read_temperature() becomes sata_ahci_get_temp() 
> and keep __sata_ahci_read_temperature() name untouched ?

Understood. You can keep the name changes you have, but please add this
explanation to the commit message.

> 
>>>   
>>> -static const struct thermal_zone_of_device_ops fsl_sata_ahci_of_thermal_ops = {
>>> +static struct thermal_zone_device_ops fsl_sata_ahci_of_thermal_ops = {
>>
>> Why remove the const ?
>>
>>>   	.get_temp = sata_ahci_read_temperature,
>>>   };
>>>   
>>> @@ -1131,8 +1136,8 @@ static int imx_ahci_probe(struct platform_device *pdev)
>>>   			ret = PTR_ERR(hwmon_dev);
>>>   			goto disable_clk;
>>>   		}
>>> -		devm_thermal_zone_of_sensor_register(hwmon_dev, 0, hwmon_dev,
>>> -					     &fsl_sata_ahci_of_thermal_ops);
>>> +		devm_thermal_of_zone_register(hwmon_dev, 0, hwmon_dev,
>>> +					      &fsl_sata_ahci_of_thermal_ops);
>>
>> This is the only change that seems necessary.
>>
>>>   		dev_info(dev, "%s: sensor 'sata_ahci'\n", dev_name(hwmon_dev));
>>>   	}
>>>   
>>
>> And it is hard to review a patch without the full series for context.
>> Please send all patches next time.
>>
>>
> 
> 


-- 
Damien Le Moal
Western Digital Research