linux-kernel - Re: [PATCH 1/3] OF: Add helper for matching against linux,stdout-path

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Message-ID: <CACxGe6uW+XN6RDnP+8QFXaCYqqPZO4dZM_aynR6AVMYZT=KuMg@mail.gmail.com>
Date:	Wed, 14 Nov 2012 20:49:54 +0000
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	linux-serial@...r.kernel.org, Alan Cox <alan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de
Subject: Re: [PATCH 1/3] OF: Add helper for matching against linux,stdout-path

On Fri, Nov 2, 2012 at 9:48 AM, Sascha Hauer <s.hauer@...gutronix.de> wrote:
> devicetrees may have a linux,stdout-path property in the chosen
> node describing the console device. This adds a helper function
> to match a device against this property so a driver can call
> add_preferred_console for a matching device.
>
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> ---
>  drivers/of/Kconfig        |    3 +++
>  drivers/of/Makefile       |    1 +
>  drivers/of/of_stdout.c    |   27 +++++++++++++++++++++++++++
>  include/linux/of_stdout.h |   24 ++++++++++++++++++++++++
>  4 files changed, 55 insertions(+)
>  create mode 100644 drivers/of/of_stdout.c
>  create mode 100644 include/linux/of_stdout.h
>
> diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
> index dfba3e6..8574ebb 100644
> --- a/drivers/of/Kconfig
> +++ b/drivers/of/Kconfig
> @@ -67,6 +67,9 @@ config OF_MDIO
>         help
>           OpenFirmware MDIO bus (Ethernet PHY) accessors
>
> +config OF_STDOUT
> +       def_bool y
> +
>  config OF_PCI
>         def_tristate PCI
>         depends on PCI
> diff --git a/drivers/of/Makefile b/drivers/of/Makefile
> index e027f44..c9f3f2f 100644
> --- a/drivers/of/Makefile
> +++ b/drivers/of/Makefile
> @@ -8,6 +8,7 @@ obj-$(CONFIG_OF_I2C)    += of_i2c.o
>  obj-$(CONFIG_OF_NET)   += of_net.o
>  obj-$(CONFIG_OF_SELFTEST) += selftest.o
>  obj-$(CONFIG_OF_MDIO)  += of_mdio.o
> +obj-$(CONFIG_OF_STDOUT) += of_stdout.o
>  obj-$(CONFIG_OF_PCI)   += of_pci.o
>  obj-$(CONFIG_OF_PCI_IRQ)  += of_pci_irq.o
>  obj-$(CONFIG_OF_MTD)   += of_mtd.o
> diff --git a/drivers/of/of_stdout.c b/drivers/of/of_stdout.c
> new file mode 100644
> index 0000000..c9e370e
> --- /dev/null
> +++ b/drivers/of/of_stdout.c
> @@ -0,0 +1,27 @@
> +/*
> + * OF helper for linux,stdoutpath property.
> + *
> + * This file is released under the GPLv2
> + */
> +#include <linux/of_stdout.h>
> +
> +/**
> + * of_device_is_stdout_path - check if a device node matches the
> + *                            linux,stdout-path property
> + *
> + * Check if this device node matches the linux,stdout-path property
> + * in the chosen node. return true if yes, false otherwise.
> + */
> +int of_device_is_stdout_path(struct device_node *dn)
> +{
> +       const char *name;
> +
> +       name = of_get_property(of_chosen, "linux,stdout-path", NULL);
> +       if (name == NULL)
> +               return 0;
> +
> +       if (dn == of_find_node_by_path(name))

need to of_node_put() the return value of of_find_node_by_path()

> +               return 1;
> +
> +       return 0;
> +}

Hi Sascha,

I'm fine with the helper, but there really is no need for a completely
separate .c file. Just put it in drivers/of/base.c.

g.
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