linux-kernel - Re: [PATCH v2 12/14] mfd: pm8008: rework driver

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Date: Wed, 29 May 2024 22:53:09 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Johan Hovold <johan+linaro@...nel.org>
Cc: Lee Jones <lee@...nel.org>, Mark Brown <broonie@...nel.org>, 
	Linus Walleij <linus.walleij@...aro.org>, Bjorn Andersson <andersson@...nel.org>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Liam Girdwood <lgirdwood@...il.com>, Das Srinagesh <quic_gurus@...cinc.com>, 
	Satya Priya Kakitapalli <quic_skakitap@...cinc.com>, Stephen Boyd <swboyd@...omium.org>, 
	"Bryan O'Donoghue" <bryan.odonoghue@...aro.org>, linux-arm-msm@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-gpio@...r.kernel.org
Subject: Re: [PATCH v2 12/14] mfd: pm8008: rework driver

On Wed, May 29, 2024 at 7:30 PM Johan Hovold <johan+linaro@...nel.org> wrote:
>
> Rework the pm8008 driver to match the new binding which no longer
> describes internal details like interrupts and register offsets
> (including which of the two consecutive I2C addresses the registers
> belong to).
>
> Instead make the interrupt controller implementation internal and pass
> interrupts to the subdrivers using MFD cell resources.
>
> Note that subdrivers may either get their resources, like register block
> offsets, from the parent MFD or this can be included in the subdrivers
> directly.
>
> In the current implementation, the temperature alarm driver is generic
> enough to just get its base address and alarm interrupt from the parent
> driver, which already uses this information to implement the interrupt
> controller.
>
> The regulator driver, however, needs additional information like parent
> supplies and regulator characteristics so in that case it is easier to
> just augment its table with the regulator register base addresses.
>
> Similarly, the current GPIO driver already holds the number of pins and
> that lookup table can therefore also be extended with register offsets.
>
> Note that subdrivers can now access the two regmaps by name, even if the
> primary regmap is registered last so that it is returned by default when
> no name is provided in lookups.
>
> Finally, note that the temperature alarm and GPIO subdrivers need some
> minor rework before they can be used with non-SPMI devices like the
> PM8008. The temperature alarm MFD cell name specifically uses a "qpnp"
> rather than "spmi" prefix to prevent binding until the driver has been
> updated.

..

> +       dummy = devm_i2c_new_dummy_device(dev, client->adapter, client->addr + 1);
> +       if (IS_ERR(dummy)) {
> +               ret = PTR_ERR(dummy);
> +               dev_err(dev, "failed to claim second address: %d\n", ret);
> +               return ret;
> +       }


> +       ret = devm_regmap_add_irq_chip_fwnode(dev, fwnode, regmap, client->irq,
>                                 IRQF_SHARED, 0, &pm8008_irq_chip, &irq_data);
> +       if (ret) {
> +               dev_err(dev, "failed to add IRQ chip: %d\n", ret);
> +               return ret;
>         }

I believe there is no harm to use

  return dev_err_probe(...);

for these. But it seems you don't like that API. Whatever, no-one will
die, just additional work for the future :-)

-- 
With Best Regards,
Andy Shevchenko