linux-kernel - Re: [PATCH 2/2] regulator: Add support for stm32 power regulators

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Message-ID: <20190410103852.GG6106@sirena.org.uk>
Date:   Wed, 10 Apr 2019 11:38:52 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Pascal PAILLET-LME <p.paillet@...com>
Cc:     "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/2] regulator: Add support for stm32 power regulators

On Mon, Apr 08, 2019 at 03:24:08PM +0000, Pascal PAILLET-LME wrote:

> +config REGULATOR_STM32_PWR
> +	bool "STMicroelectronics STM32 PWR"
> +	depends on ARCH_STM32

There's no build time dependency here, please also add an || COMPILE_TEST to 
help with build coverage.

> +int stm32_pwr_reg_is_enabled(struct regulator_dev *rdev)
> +{
> +	struct stm32_pwr_reg *priv = rdev_get_drvdata(rdev);
> +	u32 val;
> +
> +	val = readl_relaxed(priv->base + REG_PWR_CR3);
> +
> +	return (val & priv->ready_mask);
> +}

This looks like it's reading back a status bit from the hardware not the
state requested by software - I'd expect an _is_enabled() to reference
the same bit that's updated by the enable/disable functions.  This looks
like a better fit for _get_status().

> +	of_regulator_match(&pdev->dev, np, stm32_pwr_reg_matches,
> +			   STM32PWR_REG_NUM_REGS);

You don't need to open code the matching any more, just set of_match and
regulators_node in the regulator_desc and the core will do it for you.

> +MODULE_DESCRIPTION("STM32MP1 PWR voltage regulator driver");
> +MODULE_AUTHOR("Gabriel Fernandez <gabriel.fernandez@...com>");
> +MODULE_LICENSE("GPL v2");

No signoff from Gabriel?

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