mfd: syscon: Remove the platform driver support

The platform driver is dead code. It is not used by DT platforms since
commit bdb0066df96e ("mfd: syscon: Decouple syscon interface from
platform devices") which said:

    For non-DT based platforms, this patch keeps syscon platform driver
    structure so that syscon can be probed and such non-DT based drivers
    can use syscon_regmap_lookup_by_pdev API and access 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.

The last user of syscon_regmap_lookup_by_pdevname() was removed in 2018.
syscon_regmap_lookup_by_pdevname() was then removed in 2019, but that
commit failed to remove the rest of the platform driver.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Tested-by: Will McVicker <willmcvicker@google.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Reviewed-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Tested-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20241217-syscon-fixes-v2-2-4f56d750541d@kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>

diff --git a/drivers/mfd/syscon.c b/drivers/mfd/syscon.c
index 72f20de9652da2d7bad12e4bc2c43ac0c9a97f76..bfb1f69fcff1d3cd35cf04ccd4c449e7d0395c79 100644 (file)
--- a/drivers/mfd/syscon.c
+++ b/drivers/mfd/syscon.c
@@ -12,22 +12,15 @@
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/hwspinlock.h>
-#include <linux/io.h>
-#include <linux/init.h>
 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
-#include <linux/of_platform.h>
-#include <linux/platform_data/syscon.h>
-#include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
 #include <linux/mfd/syscon.h>
 #include <linux/slab.h>
 
-static struct platform_driver syscon_driver;
-
 static DEFINE_MUTEX(syscon_list_lock);
 static LIST_HEAD(syscon_list);
 
@@ -337,62 +330,3 @@ struct regmap *syscon_regmap_lookup_by_phandle_optional(struct device_node *np,
        return regmap;
 }
 EXPORT_SYMBOL_GPL(syscon_regmap_lookup_by_phandle_optional);
-
-static int syscon_probe(struct platform_device *pdev)
-{
-       struct device *dev = &pdev->dev;
-       struct syscon_platform_data *pdata = dev_get_platdata(dev);
-       struct syscon *syscon;
-       struct regmap_config syscon_config = syscon_regmap_config;
-       struct resource *res;
-       void __iomem *base;
-
-       syscon = devm_kzalloc(dev, sizeof(*syscon), GFP_KERNEL);
-       if (!syscon)
-               return -ENOMEM;
-
-       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-       if (!res)
-               return -ENOENT;
-
-       base = devm_ioremap(dev, res->start, resource_size(res));
-       if (!base)
-               return -ENOMEM;
-
-       syscon_config.max_register = resource_size(res) - 4;
-       if (!syscon_config.max_register)
-               syscon_config.max_register_is_0 = true;
-
-       if (pdata)
-               syscon_config.name = pdata->label;
-       syscon->regmap = devm_regmap_init_mmio(dev, base, &syscon_config);
-       if (IS_ERR(syscon->regmap)) {
-               dev_err(dev, "regmap init failed\n");
-               return PTR_ERR(syscon->regmap);
-       }
-
-       platform_set_drvdata(pdev, syscon);
-
-       dev_dbg(dev, "regmap %pR registered\n", res);
-
-       return 0;
-}
-
-static const struct platform_device_id syscon_ids[] = {
-       { "syscon", },
-       { }
-};
-
-static struct platform_driver syscon_driver = {
-       .driver = {
-               .name = "syscon",
-       },
-       .probe          = syscon_probe,
-       .id_table       = syscon_ids,
-};
-
-static int __init syscon_init(void)
-{
-       return platform_driver_register(&syscon_driver);
-}
-postcore_initcall(syscon_init);

diff --git a/drivers/mfd/vexpress-sysreg.c b/drivers/mfd/vexpress-sysreg.c
index d34d58ce46db2ad0d53b3daeabc9d3763883b39a..ef03d6cec9ff6927668d051ca459eb1d8ff7269e 100644 (file)
--- a/drivers/mfd/vexpress-sysreg.c
+++ b/drivers/mfd/vexpress-sysreg.c
@@ -10,7 +10,6 @@
 #include <linux/mfd/core.h>
 #include <linux/module.h>
 #include <linux/of_platform.h>
-#include <linux/platform_data/syscon.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/stat.h>

diff --git a/include/linux/platform_data/syscon.h b/include/linux/platform_data/syscon.h
deleted file mode 100644 (file)
index 2c089dd..0000000
--- a/include/linux/platform_data/syscon.h
+++ /dev/null
@@ -1,9 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef PLATFORM_DATA_SYSCON_H
-#define PLATFORM_DATA_SYSCON_H
-
-struct syscon_platform_data {
-       const char *label;
-};
-
-#endif