linux-kernel - Re: [PATCH 3/4] platform/chrome: cros_ec: Pass firmware node to MFD device

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Message-ID: <86f40fab-3e68-bc1c-425b-94f681c7b6c6@collabora.com>
Date:   Mon, 25 Nov 2019 17:30:21 +0100
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Raul E Rangel <rrangel@...omium.org>,
        Wolfram Sang <wsa@...-dreams.de>
Cc:     Akshu.Agrawal@....com, Guenter Roeck <groeck@...omium.org>,
        linux-kernel@...r.kernel.org, Benson Leung <bleung@...omium.org>
Subject: Re: [PATCH 3/4] platform/chrome: cros_ec: Pass firmware node to MFD
 device

Hi Raul,

One comment below.

On 21/11/19 22:10, Raul E Rangel wrote:
> cros_ec_dev needs to have a firmware node associated with it so mfd
> cells can be properly bound to the correct ACPI/DT nodes.
> 
> Signed-off-by: Raul E Rangel <rrangel@...omium.org>
> ---
> 
> Before this patch:
> $ find /sys/bus/platform/devices/cros-ec-* -iname firmware_node -exec ls -l '{}' \;
> <nothing>
> 
> After this patch:
> $ find /sys/bus/platform/devices/cros-ec-dev.0.auto/ -iname firmware_node -exec ls -l '{}' \;
> /sys/bus/platform/devices/cros-ec-dev.0.auto/cros-ec-accel.1.auto/firmware_node -> ../../../../../../LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:1c/PNP0C09:00/GOOG0004:00
> /sys/bus/platform/devices/cros-ec-dev.0.auto/cros-ec-chardev.7.auto/firmware_node -> ../../../../../../LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:1c/PNP0C09:00/GOOG0004:00
> /sys/bus/platform/devices/cros-ec-dev.0.auto/cros-ec-debugfs.8.auto/firmware_node -> ../../../../../../LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:1c/PNP0C09:00/GOOG0004:00
> /sys/bus/platform/devices/cros-ec-dev.0.auto/cros-ec-gyro.2.auto/firmware_node -> ../../../../../../LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:1c/PNP0C09:00/GOOG0004:00
> /sys/bus/platform/devices/cros-ec-dev.0.auto/cros-ec-lid-angle.4.auto/firmware_node -> ../../../../../../LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:1c/PNP0C09:00/GOOG0004:00
> /sys/bus/platform/devices/cros-ec-dev.0.auto/cros-ec-lightbar.9.auto/firmware_node -> ../../../../../../LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:1c/PNP0C09:00/GOOG0004:00
> /sys/bus/platform/devices/cros-ec-dev.0.auto/cros-ec-pd-sysfs.10.auto/firmware_node -> ../../../../../../LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:1c/PNP0C09:00/GOOG0004:00
> /sys/bus/platform/devices/cros-ec-dev.0.auto/cros-ec-ring.3.auto/firmware_node -> ../../../../../../LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:1c/PNP0C09:00/GOOG0004:00
> /sys/bus/platform/devices/cros-ec-dev.0.auto/cros-ec-sysfs.11.auto/firmware_node -> ../../../../../../LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:1c/PNP0C09:00/GOOG0004:00
> /sys/bus/platform/devices/cros-ec-dev.0.auto/cros-usbpd-charger.5.auto/firmware_node -> ../../../../../../LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:1c/PNP0C09:00/GOOG0004:00
> /sys/bus/platform/devices/cros-ec-dev.0.auto/cros-usbpd-logger.6.auto/firmware_node -> ../../../../../../LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:1c/PNP0C09:00/GOOG0004:00
> /sys/bus/platform/devices/cros-ec-dev.0.auto/firmware_node -> ../../../../../LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:1c/PNP0C09:00/GOOG0004:00
> 
>  drivers/platform/chrome/cros_ec.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/chrome/cros_ec.c b/drivers/platform/chrome/cros_ec.c
> index 51d76037f52a..3c08c9098d29 100644
> --- a/drivers/platform/chrome/cros_ec.c
> +++ b/drivers/platform/chrome/cros_ec.c
> @@ -167,9 +167,16 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
>  	}
>  
>  	/* Register a platform device for the main EC instance */
> -	ec_dev->ec = platform_device_register_data(ec_dev->dev, "cros-ec-dev",
> -					PLATFORM_DEVID_AUTO, &ec_p,
> -					sizeof(struct cros_ec_platform));
> +	ec_dev->ec =
> +		platform_device_register_full(&(struct platform_device_info){
> +			.parent = ec_dev->dev,
> +			.name = "cros-ec-dev",
> +			.id = PLATFORM_DEVID_AUTO,
> +			.data = &ec_p,
> +			.size_data = sizeof(struct cros_ec_platform),
> +			.fwnode = ec_dev->dev->fwnode,
> +			.of_node_reused = 1});

Please create a local `struct platform_device_info`, fill and pass the &pdevinfo
in platform_device_register_full, I think is more clear.

Thanks,
 Enric

> +
>  	if (IS_ERR(ec_dev->ec)) {
>  		dev_err(ec_dev->dev,
>  			"Failed to create CrOS EC platform device\n");
>