Currently a syscon entity can be only registered directly through a platform device that binds to a dedicated syscon driver. However in certain use cases it is desirable to make a device used with another driver a syscon interface provider. For example, certain SoCs (e.g. Exynos) contain system controller blocks which perform various functions such as power domain control, CPU power management, low power mode control, but in addition contain certain IP integration glue, such as various signal masks, coprocessor power control, etc. In such case, there is a need to have a dedicated driver for such system controller but also share registers with other drivers. The latter is where the syscon interface is helpful. In case of DT based platforms, this patch decouples syscon object from syscon platform driver, and allows to create syscon objects first time when it is required by calling of syscon_regmap_lookup_by APIs and keep a list of such syscon objects along with syscon provider device_nodes and regmap handles. For non-DT based platforms, this patch keeps syscon platform driver structure where is can be probed and such non-DT based drivers can use syscon_regmap_lookup_by_pdev API and get access to regmap handles. Once all users of "syscon_regmap_lookup_by_pdev" migrated to DT based, we can completely remove platform driver of syscon, and keep only helper functions to get regmap handles. Suggested-by: Arnd Bergmann <arnd@xxxxxxxx> Suggested-by: Tomasz Figa <tomasz.figa@xxxxxxxxx> Tested-by: Vivek Gautam <gautam.vivek@xxxxxxxxxxx> Tested-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx> Signed-off-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx> --- Patch v5 and related discussions can be found here [1]. Change since v5: - Dropping creation of dummy platform device in of_syscon_register. - As we are changing syscon to decouple from platform_device, creation of dummy platform_device does not look good option, and as suggested by Arnd, I made another attempt so that regmap_mmio_init API should work with NULL dev pointer itself. Since regmap needs to know about Syscon device node properties so let's parse device node of syscon in syscon itself for any such properties and using regmap_config parameter pass all such information to regmap. Other concern of crashes due to NULL dev pointer in regmap already addressed in separate patches of regmap. Please see [2] and [3]. Changes since v4: - Addressed Tomasz Figa's comments for v4. - Added error handing in of_syscon_register function. - Using devm_regmap_init_mmio instead of regmap_init_mmio. Changes since v3: - Addressed Arnd's comment for v2. - Updated of_syscon_register for adding dev pointer in regmap_init_mmio. - For early users created dummy platform device. Changes since v2: - Added back platform device support from syscon, with one change that syscon will not be probed for DT based platform. - Added back syscon_regmap_lookup_by_pdevname API so that non-DT base users of syscon will not be broken. - Removed unwanted change in syscon.h. - Modified Signed-off-by list, added Suggested-by of Tomasz Figa and Arnd Bergmann. - Added Tested-by of Vivek Gautam for testing on Exynos platform. Changes since v1: - Removed of_syscon_unregister function. - Modified of_syscon_register function and it will be used by syscon.c to create syscon objects whenever required. - Removed platform device support from syscon. - Removed syscon_regmap_lookup_by_pdevname API support. - As there are significant changes w.r.t patchset v1, I am taking over author for this patchset from Tomasz Figa. [1]: https://lkml.org/lkml/2014/9/22/12 [2]: https://lkml.org/lkml/2014/9/18/130 [3]: https://lkml.org/lkml/2014/9/27/2 drivers/mfd/syscon.c | 106 +++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 84 insertions(+), 22 deletions(-) diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c index ca15878..00a8410 100644 --- a/drivers/mfd/syscon.c +++ b/drivers/mfd/syscon.c @@ -15,6 +15,7 @@ #include <linux/err.h> #include <linux/io.h> #include <linux/module.h> +#include <linux/list.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_platform.h> @@ -22,31 +23,104 @@ #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/mfd/syscon.h> +#include <linux/slab.h> static struct platform_driver syscon_driver; +static DEFINE_SPINLOCK(syscon_list_slock); +static LIST_HEAD(syscon_list); + struct syscon { + struct device_node *np; struct regmap *regmap; + struct list_head list; +}; + +static struct regmap_config syscon_regmap_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, }; -static int syscon_match_node(struct device *dev, void *data) +static struct syscon *of_syscon_register(struct device_node *np) { - struct device_node *dn = data; + struct syscon *syscon; + struct regmap *regmap; + void __iomem *base; + int ret; + enum regmap_endian endian = REGMAP_ENDIAN_DEFAULT; + + if (!of_device_is_compatible(np, "syscon")) + return ERR_PTR(-EINVAL); + + syscon = kzalloc(sizeof(*syscon), GFP_KERNEL); + if (!syscon) + return ERR_PTR(-ENOMEM); + + base = of_iomap(np, 0); + if (!base) { + ret = -ENOMEM; + goto err_map; + } + + /* Parse the device's DT node for an endianness specification */ + if (of_property_read_bool(np, "big-endian")) + endian = REGMAP_ENDIAN_BIG; + else if (of_property_read_bool(np, "little-endian")) + endian = REGMAP_ENDIAN_LITTLE; + + /* If the endianness was specified in DT, use that */ + if (endian != REGMAP_ENDIAN_DEFAULT) + syscon_regmap_config.val_format_endian = endian; + + regmap = regmap_init_mmio(NULL, base, &syscon_regmap_config); + if (IS_ERR(regmap)) { + pr_err("regmap init failed\n"); + ret = PTR_ERR(regmap); + goto err_regmap; + } + + syscon->regmap = regmap; + syscon->np = np; + + spin_lock(&syscon_list_slock); + list_add_tail(&syscon->list, &syscon_list); + spin_unlock(&syscon_list_slock); - return (dev->of_node == dn) ? 1 : 0; + /* Change back endianness of syscon_regmap_config. + * As this is static config in this file and in one system we may + * have more than one syscon + */ + syscon_regmap_config.val_format_endian = REGMAP_ENDIAN_DEFAULT; + + return syscon; + +err_regmap: + iounmap(base); +err_map: + kfree(syscon); + return ERR_PTR(ret); } struct regmap *syscon_node_to_regmap(struct device_node *np) { - struct syscon *syscon; - struct device *dev; + struct syscon *entry, *syscon = NULL; - dev = driver_find_device(&syscon_driver.driver, NULL, np, - syscon_match_node); - if (!dev) - return ERR_PTR(-EPROBE_DEFER); + spin_lock(&syscon_list_slock); - syscon = dev_get_drvdata(dev); + list_for_each_entry(entry, &syscon_list, list) + if (entry->np == np) { + syscon = entry; + break; + } + + spin_unlock(&syscon_list_slock); + + if (!syscon) + syscon = of_syscon_register(np); + + if (IS_ERR(syscon)) + return ERR_CAST(syscon); return syscon->regmap; } @@ -110,17 +184,6 @@ struct regmap *syscon_regmap_lookup_by_phandle(struct device_node *np, } EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle); -static const struct of_device_id of_syscon_match[] = { - { .compatible = "syscon", }, - { }, -}; - -static struct regmap_config syscon_regmap_config = { - .reg_bits = 32, - .val_bits = 32, - .reg_stride = 4, -}; - static int syscon_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -167,7 +230,6 @@ static struct platform_driver syscon_driver = { .driver = { .name = "syscon", .owner = THIS_MODULE, - .of_match_table = of_syscon_match, }, .probe = syscon_probe, .id_table = syscon_ids, -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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