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Subject[PATCH 6/7] mfd/mc13xxx: change probing details for mc13xxx devices
Date
This removes auto-detection of which variant of mc13xxx is used because
mc34708 uses a different layout in the revision register that doesn't
allow differentiation any more.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
drivers/mfd/mc13xxx-core.c | 77 ++++++++++++++++----------------------------
drivers/mfd/mc13xxx-i2c.c | 16 +++++----
drivers/mfd/mc13xxx-spi.c | 25 +++++++-------
drivers/mfd/mc13xxx.h | 17 ++++++----
4 files changed, 60 insertions(+), 75 deletions(-)

diff --git a/drivers/mfd/mc13xxx-core.c b/drivers/mfd/mc13xxx-core.c
index f0ea3b8..7874711 100644
--- a/drivers/mfd/mc13xxx-core.c
+++ b/drivers/mfd/mc13xxx-core.c
@@ -410,62 +410,36 @@ static irqreturn_t mc13xxx_irq_thread(int irq, void *data)
return IRQ_RETVAL(handled);
}

-static const char *mc13xxx_chipname[] = {
- [MC13XXX_ID_MC13783] = "mc13783",
- [MC13XXX_ID_MC13892] = "mc13892",
-};
-
#define maskval(reg, mask) (((reg) & (mask)) >> __ffs(mask))
-static int mc13xxx_identify(struct mc13xxx *mc13xxx)
+static void mc13xxx_print_revision(struct mc13xxx *mc13xxx, u32 revision)
{
- u32 icid;
- u32 revision;
- int ret;
-
- /*
- * Get the generation ID from register 46, as apparently some older
- * IC revisions only have this info at this location. Newer ICs seem to
- * have both.
- */
- ret = mc13xxx_reg_read(mc13xxx, 46, &icid);
- if (ret)
- return ret;
-
- icid = (icid >> 6) & 0x7;
-
- switch (icid) {
- case 2:
- mc13xxx->ictype = MC13XXX_ID_MC13783;
- break;
- case 7:
- mc13xxx->ictype = MC13XXX_ID_MC13892;
- break;
- default:
- mc13xxx->ictype = MC13XXX_ID_INVALID;
- break;
- }
+ dev_info(mc13xxx->dev, "%s: rev: %d.%d, "
+ "fin: %d, fab: %d, icid: %d/%d\n",
+ mc13xxx->variant->name,
+ maskval(revision, MC13XXX_REVISION_REVFULL),
+ maskval(revision, MC13XXX_REVISION_REVMETAL),
+ maskval(revision, MC13XXX_REVISION_FIN),
+ maskval(revision, MC13XXX_REVISION_FAB),
+ maskval(revision, MC13XXX_REVISION_ICID),
+ maskval(revision, MC13XXX_REVISION_ICIDCODE));
+}

- if (mc13xxx->ictype == MC13XXX_ID_MC13783 ||
- mc13xxx->ictype == MC13XXX_ID_MC13892) {
- ret = mc13xxx_reg_read(mc13xxx, MC13XXX_REVISION, &revision);
-
- dev_info(mc13xxx->dev, "%s: rev: %d.%d, "
- "fin: %d, fab: %d, icid: %d/%d\n",
- mc13xxx_chipname[mc13xxx->ictype],
- maskval(revision, MC13XXX_REVISION_REVFULL),
- maskval(revision, MC13XXX_REVISION_REVMETAL),
- maskval(revision, MC13XXX_REVISION_FIN),
- maskval(revision, MC13XXX_REVISION_FAB),
- maskval(revision, MC13XXX_REVISION_ICID),
- maskval(revision, MC13XXX_REVISION_ICIDCODE));
- }
+/* These are only exported for mc13xxx-i2c and mc13xxx-spi */
+struct mc13xxx_variant mc13xxx_variant_mc13783 = {
+ .name = "mc13783",
+ .print_revision = mc13xxx_print_revision,
+};
+EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13783);

- return (mc13xxx->ictype == MC13XXX_ID_INVALID) ? -ENODEV : 0;
-}
+struct mc13xxx_variant mc13xxx_variant_mc13892 = {
+ .name = "mc13892",
+ .print_revision = mc13xxx_print_revision,
+};
+EXPORT_SYMBOL_GPL(mc13xxx_variant_mc13892);

static const char *mc13xxx_get_chipname(struct mc13xxx *mc13xxx)
{
- return mc13xxx_chipname[mc13xxx->ictype];
+ return mc13xxx->variant->name;
}

int mc13xxx_get_flags(struct mc13xxx *mc13xxx)
@@ -653,13 +627,16 @@ int mc13xxx_common_init(struct mc13xxx *mc13xxx,
struct mc13xxx_platform_data *pdata, int irq)
{
int ret;
+ u32 revision;

mc13xxx_lock(mc13xxx);

- ret = mc13xxx_identify(mc13xxx);
+ ret = mc13xxx_reg_read(mc13xxx, MC13XXX_REVISION, &revision);
if (ret)
goto err_revision;

+ mc13xxx_print_revision(mc13xxx, revision);
+
/* mask all irqs */
ret = mc13xxx_reg_write(mc13xxx, MC13XXX_IRQMASK0, 0x00ffffff);
if (ret)
diff --git a/drivers/mfd/mc13xxx-i2c.c b/drivers/mfd/mc13xxx-i2c.c
index e00e885..6c1598c 100644
--- a/drivers/mfd/mc13xxx-i2c.c
+++ b/drivers/mfd/mc13xxx-i2c.c
@@ -24,7 +24,7 @@
static const struct i2c_device_id mc13xxx_i2c_device_id[] = {
{
.name = "mc13892",
- .driver_data = MC13XXX_ID_MC13892,
+ .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13892,
}, {
/* sentinel */
}
@@ -34,7 +34,7 @@ MODULE_DEVICE_TABLE(i2c, mc13xxx_i2c_device_id);
static const struct of_device_id mc13xxx_dt_ids[] = {
{
.compatible = "fsl,mc13892",
- .data = (void *) &mc13xxx_i2c_device_id[0],
+ .data = &mc13xxx_variant_mc13892,
}, {
/* sentinel */
}
@@ -76,11 +76,15 @@ static int mc13xxx_i2c_probe(struct i2c_client *client,
return ret;
}

- ret = mc13xxx_common_init(mc13xxx, pdata, client->irq);
+ if (client->dev.of_node) {
+ const struct of_device_id *of_id =
+ of_match_device(mc13xxx_dt_ids, &client->dev);
+ mc13xxx->variant = of_id->data;
+ } else {
+ mc13xxx->variant = (void *)id->driver_data;
+ }

- if (ret == 0 && (id->driver_data != mc13xxx->ictype))
- dev_warn(mc13xxx->dev,
- "device id doesn't match auto detection!\n");
+ ret = mc13xxx_common_init(mc13xxx, pdata, client->irq);

return ret;
}
diff --git a/drivers/mfd/mc13xxx-spi.c b/drivers/mfd/mc13xxx-spi.c
index b99e728..75a00c4 100644
--- a/drivers/mfd/mc13xxx-spi.c
+++ b/drivers/mfd/mc13xxx-spi.c
@@ -28,10 +28,10 @@
static const struct spi_device_id mc13xxx_device_id[] = {
{
.name = "mc13783",
- .driver_data = MC13XXX_ID_MC13783,
+ .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13783,
}, {
.name = "mc13892",
- .driver_data = MC13XXX_ID_MC13892,
+ .driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13892,
}, {
/* sentinel */
}
@@ -39,8 +39,8 @@ static const struct spi_device_id mc13xxx_device_id[] = {
MODULE_DEVICE_TABLE(spi, mc13xxx_device_id);

static const struct of_device_id mc13xxx_dt_ids[] = {
- { .compatible = "fsl,mc13783", .data = (void *) MC13XXX_ID_MC13783, },
- { .compatible = "fsl,mc13892", .data = (void *) MC13XXX_ID_MC13892, },
+ { .compatible = "fsl,mc13783", .data = &mc13xxx_variant_mc13783, },
+ { .compatible = "fsl,mc13892", .data = &mc13xxx_variant_mc13892, },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
@@ -145,19 +145,18 @@ static int mc13xxx_spi_probe(struct spi_device *spi)
return ret;
}

- ret = mc13xxx_common_init(mc13xxx, pdata, spi->irq);
+ if (spi->dev.of_node) {
+ const struct of_device_id *of_id =
+ of_match_device(mc13xxx_dt_ids, &spi->dev);

- if (ret) {
- dev_set_drvdata(&spi->dev, NULL);
+ mc13xxx->variant = of_id->data;
} else {
- const struct spi_device_id *devid =
- spi_get_device_id(spi);
- if (!devid || devid->driver_data != mc13xxx->ictype)
- dev_warn(mc13xxx->dev,
- "device id doesn't match auto detection!\n");
+ const struct spi_device_id *id_entry = spi_get_device_id(spi);
+
+ mc13xxx->variant = (void *)id_entry->driver_data;
}

- return ret;
+ return mc13xxx_common_init(mc13xxx, pdata, spi->irq);
}

static int __devexit mc13xxx_spi_remove(struct spi_device *spi)
diff --git a/drivers/mfd/mc13xxx.h b/drivers/mfd/mc13xxx.h
index bbba06f..78bf4c3 100644
--- a/drivers/mfd/mc13xxx.h
+++ b/drivers/mfd/mc13xxx.h
@@ -13,19 +13,24 @@
#include <linux/regmap.h>
#include <linux/mfd/mc13xxx.h>

-enum mc13xxx_id {
- MC13XXX_ID_MC13783,
- MC13XXX_ID_MC13892,
- MC13XXX_ID_INVALID,
+#define MC13XXX_NUMREGS 0x3f
+
+struct mc13xxx;
+
+struct mc13xxx_variant {
+ const char *name;
+ void (*print_revision)(struct mc13xxx *mc13xxx, u32 revision);
};

-#define MC13XXX_NUMREGS 0x3f
+extern struct mc13xxx_variant
+ mc13xxx_variant_mc13783,
+ mc13xxx_variant_mc13892;

struct mc13xxx {
struct regmap *regmap;

struct device *dev;
- enum mc13xxx_id ictype;
+ const struct mc13xxx_variant *variant;

struct mutex lock;
int irq;
--
1.7.10.4
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