Re: [PATCH v2 08/12] ASoC: arizona-jack: convert into a helper library for codec drivers

From: Richard Fitzgerald
Date: Tue Jan 19 2021 - 05:26:06 EST

On 18/01/2021 17:24, Andy Shevchenko wrote:
On Sun, Jan 17, 2021 at 6:06 PM Hans de Goede <hdegoede@xxxxxxxxxx> wrote:

Convert the arizona extcon driver into a helper library for direct use
from the arizona codec-drivers, rather then being bound to a separate
MFD cell.

Note the probe (and remove) sequence is split into 2 parts:

1. The arizona_jack_codec_dev_probe() function inits a bunch of
jack-detect specific variables in struct arizona_priv and tries to get
a number of resources where getting them may fail with -EPROBE_DEFER.

2. Then once the machine driver has create a snd_sock_jack through
snd_soc_card_jack_new() it calls snd_soc_component_set_jack() on
the codec component, which will call the new arizona_jack_set_jack(),
which sets up jack-detection and requests the IRQs.

This split is necessary, because the IRQ handlers need access to the
arizona->dapm pointer and the snd_sock_jack which are not available
when the codec-driver's probe function runs.

Note this requires that machine-drivers for codecs which are converted
to use the new helper functions from arizona-jack.c are modified to
create a snd_soc_jack through snd_soc_card_jack_new() and register
this jack with the codec through snd_soc_component_set_jack().


+int arizona_jack_codec_dev_probe(struct arizona_priv *info, struct device *dev)
- struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
+ struct arizona *arizona = info->arizona;
struct arizona_pdata *pdata = &arizona->pdata;

+ int ret, mode;

if (!dev_get_platdata(arizona->dev))
- arizona_extcon_device_get_pdata(&pdev->dev, arizona);
+ arizona_extcon_device_get_pdata(dev, arizona);

- info->micvdd = devm_regulator_get(&pdev->dev, "MICVDD");
+ info->micvdd = devm_regulator_get(arizona->dev, "MICVDD");

I'm wondering if arizona->dev == dev here. if no, can this function
get a comment / kernel-doc explaining what dev is?

pdev->dev would be *this* driver.
arizona->dev should be the MFD parent driver.

I think these gets should be against the dev passed in as argument
(I assume that is the caller's pdev->dev). So they are owned by this
driver, not its parent.