linux-kernel - Re: [PATCH v3 3/4] mfd: mfd-core: reattach mfd of_node to cells without of

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20160809134847.GJ5243@dell>
Date:	Tue, 9 Aug 2016 14:48:47 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Quentin Schulz <quentin.schulz@...e-electrons.com>
Cc:	jdelvare@...e.com, linux@...ck-us.net, jic23@...nel.org,
	knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
	maxime.ripard@...e-electrons.com, wens@...e.org,
	linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
	linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	thomas.petazzoni@...e-electrons.com,
	antoine.tenart@...e-electrons.com
Subject: Re: [PATCH v3 3/4] mfd: mfd-core: reattach mfd of_node to cells
 without of_compatible

On Tue, 26 Jul 2016, Quentin Schulz wrote:

> When an MFD cell has an of_compatible (meaning it is present in the Device
> Tree), other nodes can reference it using a phandle.
> 
> However when the MFD cell is not declared in the Device Tree, the only way
> other nodes can reference it are by using a phandle to the MFD. Then when
> this MFD cell tries to register itself in one framework, the registration
> is denied by the framework because it is not matching the of_node of the
> node which is referenced by the phandle in one of the other nodes.
> 
> This reattaches the of_node of the MFD to the MFD cell device structure
> when the MFD cell has no of_compatible.
> 
> Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
> ---
> 
> We need this modification to register the thermal sensor in the thermal
> framework.
> 
> Added in v3.
> 
>  drivers/mfd/mfd-core.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)

Can you show me the DT code where this is used?

Is it used by a patch in this series?

> diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
> index 3ac486a..0b19663 100644
> --- a/drivers/mfd/mfd-core.c
> +++ b/drivers/mfd/mfd-core.c
> @@ -175,12 +175,16 @@ static int mfd_add_device(struct device *parent, int id,
>  	if (ret < 0)
>  		goto fail_res;
>  
> -	if (parent->of_node && cell->of_compatible) {
> -		for_each_child_of_node(parent->of_node, np) {
> -			if (of_device_is_compatible(np, cell->of_compatible)) {
> -				pdev->dev.of_node = np;
> -				break;
> +	if (parent->of_node) {
> +		if (cell->of_compatible) {
> +			for_each_child_of_node(parent->of_node, np) {
> +				if (of_device_is_compatible(np, cell->of_compatible)) {
> +					pdev->dev.of_node = np;
> +					break;
> +				}
>  			}
> +		} else {
> +			pdev->dev.of_node = parent->of_node;
>  		}
>  	}
>  

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog