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, 7 insertions, 7 deletions

diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 3a644cf62f..622c56d97b 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -387,22 +387,22 @@ static struct platform_device_id at91_twi_devtypes[] = {
 static struct of_device_id at91_twi_dt_ids[] = {
 	{
 		.compatible = "atmel,at91rm9200-i2c",
-		.data = (unsigned long) &at91rm9200_config,
+		.data = &at91rm9200_config,
 	} , {
 		.compatible = "atmel,at91sam9260-i2c",
-		.data = (unsigned long) &at91sam9260_config,
+		.data = &at91sam9260_config,
 	} , {
 		.compatible = "atmel,at91sam9261-i2c",
-		.data = (unsigned long) &at91sam9261_config,
+		.data = &at91sam9261_config,
 	} , {
 		.compatible = "atmel,at91sam9g20-i2c",
-		.data = (unsigned long) &at91sam9g20_config,
+		.data = &at91sam9g20_config,
 	} , {
 		.compatible = "atmel,at91sam9g10-i2c",
-		.data = (unsigned long) &at91sam9g10_config,
+		.data = &at91sam9g10_config,
 	}, {
 		.compatible = "atmel,at91sam9x5-i2c",
-		.data = (unsigned long) &at91sam9x5_config,
+		.data = &at91sam9x5_config,
 	}, {
 		/* sentinel */
 	}
@@ -417,7 +417,7 @@ static int at91_twi_probe(struct device_d *dev)
 
 	i2c_at91 = xzalloc(sizeof(struct at91_twi_dev));
 
-	rc = dev_get_drvdata(dev, (unsigned long *)&i2c_data);
+	rc = dev_get_drvdata(dev, (const void **)&i2c_data);
 	if (rc < 0) {
 		dev_err(dev, "failed to retrieve driver data\n");
 		goto out_free;