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Date: Wed, 8 Jun 2016 15:31:24 +0100
From: Lee Jones <lee.jones@linaro.org>
To: John Stultz <john.stultz@linaro.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Ian Campbell <ijc+devicetree@hellion.org.uk>,
        Kumar Gala <galak@codeaurora.org>,
        Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>,
        Wei Xu <xuwei5@hisilicon.com>, Guodong Xu <guodong.xu@linaro.org>
Subject: Re: [RFC][PATCH 2/5] hi655x-pmic: Make hi655x pmic logic probe child
 nodes in the dt
Message-ID: <20160608143124.GI14888@dell>
References: <1464816460-18750-1-git-send-email-john.stultz@linaro.org>
 <1464816460-18750-3-git-send-email-john.stultz@linaro.org>
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Subject should indicate "mfd".

`git log --oneline -- drivers/mfd`

> In trying to wire up the powerkey driver, I found I
> needed to add this to get the pmic logic to probe

PMIC

> child nodes in the dt data.

DT.

Please use full buffer width.  Wrapping at 50 chars is not necessary.

> With this patch, child nodes get properly probed.
> 
> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Pawel Moll <pawel.moll@arm.com>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
> Cc: Kumar Gala <galak@codeaurora.org>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
> Cc: Wei Xu <xuwei5@hisilicon.com>
> Cc: Guodong Xu <guodong.xu@linaro.org>
> Signed-off-by: John Stultz <john.stultz@linaro.org>
> ---
>  drivers/mfd/hi655x-pmic.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/mfd/hi655x-pmic.c b/drivers/mfd/hi655x-pmic.c
> index 05ddc78..3511035 100644
> --- a/drivers/mfd/hi655x-pmic.c
> +++ b/drivers/mfd/hi655x-pmic.c
> @@ -39,6 +39,11 @@ static const struct regmap_irq hi655x_irqs[] = {
>  	{ .reg_offset = 0, .mask = RESERVE_INT },
>  };
>  
> +static const struct of_device_id of_hi655x_pmic_child_match_tbl[] = {
> +	{ .compatible = "hisilicon,hi6552-powerkey", },
> +	{ /* end */ }
> +};
> +
>  static const struct regmap_irq_chip hi655x_irq_chip = {
>  	.name = "hi655x-pmic",
>  	.irqs = hi655x_irqs,
> @@ -122,6 +127,9 @@ static int hi655x_pmic_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, pmic);
>  
> +	/* populate sub nodes */
> +	of_platform_populate(np, of_hi655x_pmic_child_match_tbl, NULL, dev);
> +

Oh, holey poop, no!

Please don't mix DT and MFD registration like this.

Drivers should contain either of_platform_populate() or
mfd_add_devices(), but never both.

>  	ret = mfd_add_devices(dev, PLATFORM_DEVID_AUTO, hi655x_pmic_devs,
>  			      ARRAY_SIZE(hi655x_pmic_devs), NULL, 0, NULL);
>  	if (ret) {

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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