linux-kernel - Re: [PATCHv5 4/6] mfd: da9052: make touchscreen registration optional

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Date:   Mon, 17 Jul 2017 15:34:44 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Sebastian Reichel <sebastian.reichel@...labora.co.uk>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Support Opensource <support.opensource@...semi.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>, devicetree@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv5 4/6] mfd: da9052: make touchscreen registration optional

On Mon, 03 Jul 2017, Sebastian Reichel wrote:

> If the touchscreen pins are used as general purpose analogue
> input, the touchscreen driver should not be used. The pins
> will be handled by the existing hwmon driver instead.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>
> ---
>  drivers/mfd/da9052-core.c | 28 +++++++++++++++++++++++++---
>  1 file changed, 25 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mfd/da9052-core.c b/drivers/mfd/da9052-core.c
> index 977418ca9117..a671c18381d7 100644
> --- a/drivers/mfd/da9052-core.c
> +++ b/drivers/mfd/da9052-core.c
> @@ -18,6 +18,7 @@
>  #include <linux/mfd/core.h>
>  #include <linux/slab.h>
>  #include <linux/module.h>
> +#include <linux/property.h>
>  
>  #include <linux/mfd/da9052/da9052.h>
>  #include <linux/mfd/da9052/pdata.h>
> @@ -521,9 +522,6 @@ static const struct mfd_cell da9052_subdev_info[] = {
>  		.name = "da9052-wled3",
>  	},
>  	{
> -		.name = "da9052-tsi",
> -	},
> -	{
>  		.name = "da9052-bat",
>  	},
>  	{
> @@ -531,6 +529,12 @@ static const struct mfd_cell da9052_subdev_info[] = {
>  	},
>  };
>  
> +static const struct mfd_cell da9052_tsi_subdev_info[] = {
> +	{
> +		.name = "da9052-tsi",
> +	},
> +};

I normally prefer these one a single line.

Once fixed:

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>

>  const struct regmap_config da9052_regmap_config = {
>  	.reg_bits = 8,
>  	.val_bits = 8,
> @@ -621,9 +625,27 @@ int da9052_device_init(struct da9052 *da9052, u8 chip_id)
>  		goto err;
>  	}
>  
> +	/*
> +	 * Check if touchscreen pins are used are analogue input instead
> +	 * of having a touchscreen connected to them. The analogue input
> +	 * functionality will be provided by hwmon driver (if enabled).
> +	 */
> +	if (!device_property_read_bool(da9052->dev, "dlg,tsi-as-adc")) {
> +		ret = mfd_add_devices(da9052->dev, PLATFORM_DEVID_AUTO,
> +				      da9052_tsi_subdev_info,
> +				      ARRAY_SIZE(da9052_tsi_subdev_info),
> +				      NULL, 0, NULL);
> +		if (ret) {
> +			dev_err(da9052->dev, "failed to add TSI subdev: %d\n",
> +				ret);
> +			goto err;
> +		}
> +	}
> +
>  	return 0;
>  
>  err:
> +	mfd_remove_devices(da9052->dev);
>  	da9052_irq_exit(da9052);
>  
>  	return ret;

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