linux-kernel - Re: [PATCH 4/4] mfd: tps65217: Instantiate sub-devices from device tree

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Message-ID: <6359abe2-9a21-78a2-f5ea-87e2e3335af3@ti.com>
Date:   Wed, 7 Jun 2017 11:05:32 -0500
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-leds@...r.kernel.org>, <linux-input@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>
CC:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Tony Lindgren <tony@...mide.com>, <javier@...hile0.org>
Subject: Re: [PATCH 4/4] mfd: tps65217: Instantiate sub-devices from device
 tree



On 06/07/2017 05:32 AM, Enric Balletbo i Serra wrote:
> The driver boots only via device tree but currently all the MFD sub-devices
> are instatiated independently of the device tree configuration, i.e
> although tps65217-charger is disabled by default it's instantiated by the
> MFD driver.
> 
> Instead of register all sub-devices, if the TPS65217 device tree node has a
> sub-node enabled, try to instatiate them as MFD sub-devices but not
> instantiate sub-nodes that are not enabled.
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
>   drivers/mfd/tps65217.c       | 56 +++++++-------------------------------------
>   include/linux/mfd/tps65217.h |  6 -----
>   2 files changed, 9 insertions(+), 53 deletions(-)
> 
> diff --git a/drivers/mfd/tps65217.c b/drivers/mfd/tps65217.c
> index f769c7d..9effdda 100644
> --- a/drivers/mfd/tps65217.c
> +++ b/drivers/mfd/tps65217.c
> @@ -33,14 +33,7 @@
>   #include <linux/mfd/core.h>
>   #include <linux/mfd/tps65217.h>
>   
> -static struct resource charger_resources[] = {
> -	DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_AC, "AC"),
> -	DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_USB, "USB"),
> -};
> -
> -static struct resource pb_resources[] = {
> -	DEFINE_RES_IRQ_NAMED(TPS65217_IRQ_PB, "PB"),
> -};

May be I messed smth, but how about interrupts for charger and pwrbutton?

> +#define TPS65217_NUM_IRQ	3
>   
>   static void tps65217_irq_lock(struct irq_data *data)
>   {
> @@ -86,29 +79,6 @@ static struct irq_chip tps65217_irq_chip = {
>   	.irq_disable		= tps65217_irq_disable,
>   };
>   
> -static struct mfd_cell tps65217s[] = {
> -	{
> -		.name = "tps65217-pmic",
> -		.of_compatible = "ti,tps65217-pmic",
> -	},
> -	{
> -		.name = "tps65217-bl",
> -		.of_compatible = "ti,tps65217-bl",
> -	},
> -	{
> -		.name = "tps65217-charger",
> -		.num_resources = ARRAY_SIZE(charger_resources),
> -		.resources = charger_resources,
> -		.of_compatible = "ti,tps65217-charger",
> -	},
> -	{
> -		.name = "tps65217-pwrbutton",
> -		.num_resources = ARRAY_SIZE(pb_resources),
> -		.resources = pb_resources,
> -		.of_compatible = "ti,tps65217-pwrbutton",
> -	},
> -};
> -
>   static irqreturn_t tps65217_irq_thread(int irq, void *data)
>   {
>   	struct tps65217 *tps = data;
> @@ -359,23 +329,8 @@ static int tps65217_probe(struct i2c_client *client,
>   		return ret;
>   	}
>   
> -	if (client->irq) {
> +	if (client->irq)
>   		tps65217_irq_init(tps, client->irq);
> -	} else {
> -		int i;
> -
> -		/* Don't tell children about IRQ resources which won't fire */
> -		for (i = 0; i < ARRAY_SIZE(tps65217s); i++)
> -			tps65217s[i].num_resources = 0;
> -	}
> -
> -	ret = devm_mfd_add_devices(tps->dev, -1, tps65217s,
> -				   ARRAY_SIZE(tps65217s), NULL, 0,
> -				   tps->irq_domain);
> -	if (ret < 0) {
> -		dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
> -		return ret;
> -	}

And as I remember there was a request to use mfd_add_devices()
and not of_platform_populate() for mfd sub-devices instantiation.

 
>   
>   	ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
>   	if (ret < 0) {
> @@ -384,6 +339,13 @@ static int tps65217_probe(struct i2c_client *client,
>   		return ret;
>   	}
>   
> +	ret = of_platform_populate(client->dev.of_node, NULL, NULL,
> +				   &client->dev);
> +	if (ret) {
> +		dev_err(&client->dev, "Failed to register sub-devices\n");
> +		return ret;
> +	}
> +
>   	/* Set the PMIC to shutdown on PWR_EN toggle */
>   	if (status_off) {
>   		ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
> diff --git a/include/linux/mfd/tps65217.h b/include/linux/mfd/tps65217.h
> index eac2857..dfc51f5 100644
> --- a/include/linux/mfd/tps65217.h
> +++ b/include/linux/mfd/tps65217.h
> @@ -236,12 +236,6 @@ struct tps65217_bl_pdata {
>   	int dft_brightness;
>   };
>   
> -/* Interrupt numbers */
> -#define TPS65217_IRQ_USB		0
> -#define TPS65217_IRQ_AC			1
> -#define TPS65217_IRQ_PB			2
> -#define TPS65217_NUM_IRQ		3
> -
>   /**
>    * struct tps65217_board - packages regulator init data
>    * @tps65217_regulator_data: regulator initialization values
> 

-- 
regards,
-grygorii