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Subject: Re: [PATCH] phy: core: document calibrate() method
To:     Kishon Vijay Abraham I <kishon@ti.com>, linux-usb@vger.kernel.org,
        linux-samsung-soc@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
From:   Marek Szyprowski <m.szyprowski@samsung.com>
Message-ID: <1865da50-000f-e235-4090-1058d2aa217b@samsung.com>
Date:   Fri, 19 Jul 2019 14:21:00 +0200
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Hi Kishon,

On 2019-07-19 12:04, Kishon Vijay Abraham I wrote:
> Hi Marek,
>
> On 19/07/19 3:22 PM, Marek Szyprowski wrote:
>> Commit 36914111e682 ("drivers: phy: add calibrate method") added support
>> for generic phy_calibrate() method, but it didn't explain in detail when
>> such method is supposed to be called. Add some more documentation directly
>> to the phy.h to make it clean that it is intended to be called after every
>> host controller reset.
>>
>> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
>> ---
>>   include/linux/phy/phy.h | 12 ++++++++++++
>>   1 file changed, 12 insertions(+)
>>
>> diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
>> index 15032f145063..46775e8b0ed9 100644
>> --- a/include/linux/phy/phy.h
>> +++ b/include/linux/phy/phy.h
>> @@ -101,6 +101,18 @@ struct phy_ops {
>>   	int	(*validate)(struct phy *phy, enum phy_mode mode, int submode,
>>   			    union phy_configure_opts *opts);
>>   	int	(*reset)(struct phy *phy);
>> +
>> +	/**
>> +	 * @calibrate:
>> +	 *
>> +	 * Optional.
>> +	 *
>> +	 * Used to calibrate phy, typically by adjusting some parameters
>> +	 * in runtime, which are otherwise lost after host controller
>> +	 * reset and cannot be set in phy_init() and phy_power_on().
>> +	 *
>> +	 * Returns: 0 if successful, an negative error code otherwise
>> +	 */
>>   	int	(*calibrate)(struct phy *phy);
> This should be added in drivers/phy/phy-core.c before phy_calibrate()?

Okay. Do you want to keep it also in phy.h (like for validate and 
configure)?


> We could
> add a separate section in Documentation/phy.txt to document these phy_ops.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland