From: Shawn Guo <shawn.guo@linaro.org>
To: Dong Aisheng <b29396@freescale.com>
Cc: <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linus.walleij@stericsson.com>, <s.hauer@pengutronix.de>,
<kernel@pengutronix.de>, <grant.likely@secretlab.ca>,
<rob.herring@calxeda.com>, <sameo@linux.intel.com>, <lrg@ti.com>,
<broonie@opensource.wolfsonmicro.com>,
<richard.zhao@freescale.com>,
<devicetree-discuss@lists.ozlabs.org>, <swarren@wwwdotorg.org>
Subject: Re: [PATCH v4 1/7] mfd: add syscon driver based on regmap
Date: Fri, 31 Aug 2012 09:26:29 +0800 [thread overview]
Message-ID: <20120831012626.GA7726@r65073-Latitude-D630> (raw)
In-Reply-To: <1346237818-9498-2-git-send-email-b29396@freescale.com>
On Wed, Aug 29, 2012 at 06:56:52PM +0800, Dong Aisheng wrote:
> +config MFD_SYSCON
> + bool "System Controller Register R/W Based on Regmap"
If the driver only compiles and works for device tree probe, we should
have the following?
depends on OF
> + select REGMAP_MMIO
> + help
> + Select this option to enable accessing system control registers
> + via regmap.
> +
<snip>
> +struct regmap *syscon_node_to_regmap(struct device_node *np)
> +{
> + struct syscon *syscon;
> + struct device *dev;
> +
> + dev = driver_find_device(&syscon_driver.driver, NULL, np,
> + syscon_match);
> + of_node_put(np);
This looks a little unnatural to me. Function syscon_node_to_regmap
becomes an API visible to clients, who might never know that np will
be put inside the API. I'm saying the client may also call of_node_put
to put the node they get.
I think of_node_put should be moved out from here and put into
syscon_node_to_regmap and syscon_regmap_lookup_by_compatible.
Regards,
Shawn
> +
> + if (!dev)
> + return ERR_PTR(-EPROBE_DEFER);
> +
> + syscon = dev_get_drvdata(dev);
> +
> + return syscon->regmap;
> +}
> +EXPORT_SYMBOL_GPL(syscon_node_to_regmap);
> +
> +struct regmap *syscon_regmap_lookup_by_compatible(const char *s)
> +{
> + struct device_node *syscon_np;
> +
> + syscon_np = of_find_compatible_node(NULL, NULL, s);
> + if (!syscon_np)
> + return ERR_PTR(-ENODEV);
> +
> + return syscon_node_to_regmap(syscon_np);
> +}
> +EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_compatible);
> +
> +struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np,
> + const char *property)
> +{
> + struct device_node *syscon_np;
> +
> + syscon_np = of_parse_phandle(np, property, 0);
> + if (!syscon_np)
> + return ERR_PTR(-ENODEV);
> +
> + return syscon_node_to_regmap(syscon_np);
> +}
> +EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle);
next prev parent reply other threads:[~2012-08-31 14:26 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-29 10:56 [PATCH v4 0/7] add syscon driver based on regmap for general registers access Dong Aisheng
2012-08-29 10:56 ` [PATCH v4 1/7] mfd: add syscon driver based on regmap Dong Aisheng
2012-08-31 1:26 ` Shawn Guo [this message]
2012-09-03 2:31 ` Dong Aisheng
2012-09-03 3:09 ` Shawn Guo
2012-09-03 8:02 ` Dong Aisheng
2012-08-29 10:56 ` [PATCH v4 2/7] ARM: imx6q: add iomuxc gpr support into syscon Dong Aisheng
2012-08-31 2:02 ` Shawn Guo
2012-09-03 2:46 ` Dong Aisheng
2012-08-29 10:56 ` [PATCH v4 3/7] ARM: imx6q: add anatop " Dong Aisheng
2012-08-29 10:56 ` [PATCH v4 4/7] regulator: anatop-regulator: convert to use syscon to access anatop register Dong Aisheng
2012-08-29 10:56 ` [PATCH v4 5/7] ARM: imx6q: convert to use syscon to access anatop registers Dong Aisheng
2012-08-29 10:56 ` [PATCH v4 6/7] ARM: dts: imx6q: add simple-bus compatible string for anatop Dong Aisheng
2012-08-29 10:56 ` [PATCH v4 7/7] mfd: anatop-mfd: remove anatop driver Dong Aisheng
2012-08-31 1:39 ` Shawn Guo
2012-09-03 2:34 ` Dong Aisheng
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