of: use 'const void *' for struct of_device_id.data

Since 2011 barebox' of_device_id struct uses unsigned long type for data field:

    struct of_device_id {
            char *compatible;
            unsigned long data;
    };

Almost always struct of_device_id.data field are used as pointer
and need 'unsigned long' casting.

E.g. see 'git grep -A 4 of_device_id drivers/' output:

    drivers/ata/sata-imx.c:static __maybe_unused struct of_device_id imx_sata_dt_ids[] = {
    drivers/ata/sata-imx.c- {
    drivers/ata/sata-imx.c-         .compatible = "fsl,imx6q-ahci",
    drivers/ata/sata-imx.c-         .data = (unsigned long)&data_imx6,
    drivers/ata/sata-imx.c- }, {

Here is of_device_id struct in linux kernel v4.0:

    struct of_device_id {
            char name[32];
            char type[32];
            char compatible[128];
            const void *data;
    };

Changing of_device_id.data type to 'const void *data' will increase
barebox' linux kernel compatibility and decrease number of 'unsigned
long' casts.

Part of the patch was done using the 'coccinelle' tool with the
following semantic patch:

    @rule1@
    identifier dev;
    identifier type;
    identifier func;
    @@
    func(...) {
    <...
    - dev_get_drvdata(dev, (unsigned long *)&type)
    + dev_get_drvdata(dev, (const void **)&type)
    ...>
    }
    @rule2@
    identifier dev;
    identifier type;
    identifier func;
    identifier data;
    @@
    func(...) {
    <...
    - dev_get_drvdata(dev, (unsigned long *)&type->data)
    + dev_get_drvdata(dev, (const void **)&type->data)
    ...>
    }

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index 590c97c964..da020d822b 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -404,7 +404,7 @@ void devices_shutdown(void)
 	}
 }
 
-int dev_get_drvdata(struct device_d *dev, unsigned long *data)
+int dev_get_drvdata(struct device_d *dev, const void **data)
 {
 	if (dev->of_id_entry) {
 		*data = dev->of_id_entry->data;
@@ -412,7 +412,7 @@ int dev_get_drvdata(struct device_d *dev, unsigned long *data)
 	}
 
 	if (dev->id_entry) {
-		*data = dev->id_entry->driver_data;
+		*data = (const void **)dev->id_entry->driver_data;
 		return 0;
 	}