linux-kernel - Re: [PATCH v2 02/11] mfd: wcd934x: add support to wcd9340/wcd9341 codec

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Date:   Mon, 21 Oct 2019 13:14:09 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     robh@...nel.org, broonie@...nel.org, linus.walleij@...aro.org,
        vinod.koul@...aro.org, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        spapothi@...eaurora.org, bgoswami@...eaurora.org,
        linux-gpio@...r.kernel.org
Subject: Re: [PATCH v2 02/11] mfd: wcd934x: add support to wcd9340/wcd9341
 codec



On 21/10/2019 12:45, Lee Jones wrote:
> On Mon, 21 Oct 2019, Srinivas Kandagatla wrote:
> 
>> Thanks Lee for taking time to review.
>>
>> I agree with most of the style related comments, will fix them in next
>> version. For others I have replied it inline.
> 
> [...]
> 
>>>> +static int wcd934x_slim_status(struct slim_device *sdev,
>>>> +			       enum slim_device_status status)
>>>> +{
>>>> +	struct device *dev = &sdev->dev;
>>>> +	struct wcd934x_data *wcd;
>>>> +	int ret;
>>>
>>> This is semantically odd!  Why are you doing most of the
>>> initialisation and bring-up in 'status' and not 'probe'.  Seems
>>> broken to me.
>>
>> SLIMBus device will not be in a state to communicate before enumeration (at
>> probe), so all the device initialization is done in status callback where it
>> is ready for communication.
> 
> Why do we need the device to be up *before* calling probe?
> 

To Initialize the device.
And SLIMbus device registers access can not be done before enumeration.


>> This is same with SoundWire Bus as well!
> 
> [...]
> 
>>>> +	struct device *dev;
>>>> +	struct clk *extclk;
>>>> +	struct regmap *regmap;
>>>> +	struct slim_device *sdev;
>>>
>>> You don't need 'sdev' and 'dev'.
>>
>> slim_device instance (sdev) is required by audio codec driver to allocate
>> stream runtime.
> 
> You can extrapolate one from the other.
That is possible to do! I can give that a try and see in next version!

>