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Date: Thu, 7 Feb 2013 15:29:32 +0800
From: Dong Aisheng <b29396@...escale.com>
To: Alexander Shiyan <shc_work@...l.ru>
CC: <linux-kernel@...r.kernel.org>,
Samuel Ortiz <sameo@...ux.intel.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Dong Aisheng <dong.aisheng@...aro.org>
Subject: Re: [PATCH] mfd: syscon: Added support for using platform driver
resources
Hi Alexander,
Thanks for the patch adding non-dt support. :-)
On Mon, Feb 04, 2013 at 07:00:40PM +0400, Alexander Shiyan wrote:
> This patch adds support usage platform driver resources, i.e.
> possibility works without oftree support. Additionally patch
> removes CONFIG_OF dependency and adds helper for accessing
> regmap by searching device by its name.
>
> Signed-off-by: Alexander Shiyan <shc_work@...l.ru>
> ---
> drivers/mfd/Kconfig | 1 -
> drivers/mfd/syscon.c | 62 +++++++++++++++++++++++++++++++++++-----------
> include/linux/mfd/syscon.h | 1 +
> 3 files changed, 48 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 47ad4e2..389f5e2 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1065,7 +1065,6 @@ config MFD_STA2X11
>
> config MFD_SYSCON
> bool "System Controller Register R/W Based on Regmap"
> - depends on OF
> select REGMAP_MMIO
> help
> Select this option to enable accessing system control registers
> diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
> index 3f10591..27d0a08 100644
> --- a/drivers/mfd/syscon.c
> +++ b/drivers/mfd/syscon.c
> @@ -29,7 +29,27 @@ struct syscon {
> struct regmap *regmap;
> };
>
> -static int syscon_match(struct device *dev, void *data)
> +static int syscon_match_name(struct device *dev, void *data)
> +{
> + return !strcmp(dev_name(dev), (const char *)data);
> +}
> +
> +struct regmap *syscon_regmap_lookup_by_name(const char *name)
> +{
> + struct syscon *syscon;
> + struct device *dev;
> +
> + dev = driver_find_device(&syscon_driver.driver, NULL, (void *)name,
> + syscon_match_name);
> + if (!dev)
> + return ERR_PTR(-EPROBE_DEFER);
> +
> + syscon = dev_get_drvdata(dev);
> +
> + return syscon->regmap;
> +}
> +
How about syscon_dev_to_regmap(struct device *dev) as the exist dt version
syscon_node_to_regmap since it's not affected by the name change of devices?
> +static int syscon_match_of(struct device *dev, void *data)
> {
> struct syscon *syscon = dev_get_drvdata(dev);
> struct device_node *dn = data;
> @@ -43,7 +63,7 @@ struct regmap *syscon_node_to_regmap(struct device_node *np)
> struct device *dev;
>
> dev = driver_find_device(&syscon_driver.driver, NULL, np,
> - syscon_match);
> + syscon_match_of);
> if (!dev)
> return ERR_PTR(-EPROBE_DEFER);
>
> @@ -102,26 +122,38 @@ static int syscon_probe(struct platform_device *pdev)
> struct device *dev = &pdev->dev;
> struct device_node *np = dev->of_node;
> struct syscon *syscon;
> - struct resource res;
> + struct resource *res, res_of;
> int ret;
>
> - if (!np)
> - return -ENOENT;
> -
> syscon = devm_kzalloc(dev, sizeof(struct syscon),
> GFP_KERNEL);
> if (!syscon)
> return -ENOMEM;
>
> - syscon->base = of_iomap(np, 0);
> - if (!syscon->base)
> - return -EADDRNOTAVAIL;
> -
> - ret = of_address_to_resource(np, 0, &res);
> - if (ret)
> - return ret;
> + if (IS_ENABLED(CONFIG_OF) && np) {
> + syscon->base = of_iomap(np, 0);
> + if (!syscon->base)
> + return -EADDRNOTAVAIL;
> +
> + res = &res_of;
> + ret = of_address_to_resource(np, 0, res);
> + if (ret)
> + return ret;
> + } else {
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res)
> + return -ENXIO;
> +
> + if (!request_mem_region(res->start, resource_size(res),
> + dev_name(&pdev->dev)))
> + return -EBUSY;
> +
> + syscon->base = ioremap(res->start, resource_size(res));
> + if (!syscon->base)
> + return -EADDRNOTAVAIL;
devm_request_and_ioremap?
Regards
Dong Aisheng
> + }
>
> - syscon_regmap_config.max_register = res.end - res.start - 3;
> + syscon_regmap_config.max_register = res->end - res->start - 3;
> syscon->regmap = devm_regmap_init_mmio(dev, syscon->base,
> &syscon_regmap_config);
> if (IS_ERR(syscon->regmap)) {
> @@ -133,7 +165,7 @@ static int syscon_probe(struct platform_device *pdev)
> platform_set_drvdata(pdev, syscon);
>
> dev_info(dev, "syscon regmap start 0x%x end 0x%x registered\n",
> - res.start, res.end);
> + res->start, res->end);
>
> return 0;
> }
> diff --git a/include/linux/mfd/syscon.h b/include/linux/mfd/syscon.h
> index 6aeb6b8..e14f7fd 100644
> --- a/include/linux/mfd/syscon.h
> +++ b/include/linux/mfd/syscon.h
> @@ -15,6 +15,7 @@
> #ifndef __LINUX_MFD_SYSCON_H__
> #define __LINUX_MFD_SYSCON_H__
>
> +extern struct regmap *syscon_regmap_lookup_by_name(const char *name);
> extern struct regmap *syscon_node_to_regmap(struct device_node *np);
> extern struct regmap *syscon_regmap_lookup_by_compatible(const char *s);
> extern struct regmap *syscon_regmap_lookup_by_phandle(
> --
> 1.7.12.4
>
> --
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