This is a diagnostic patch, dumping the IDCODE of the
TWL4030/TWL5030/... family chips.
Not for merging, at least for now. Later this may be
useful to make sure the reduced-functionality catalog
parts (TPS series) don't go registering components that
don't exist, like the battery charger.
The main curiousity we've uncovered is that TWL5030 ES1.0
mis-identifies itself as TWL4030 ES1.0 ... unclear just now
whether that's also true of ES1.1 and later parts.
- Dave
---
drivers/mfd/twl4030-core.c | 62 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)
--- a/drivers/mfd/twl4030-core.c
+++ b/drivers/mfd/twl4030-core.c
@@ -748,6 +748,66 @@ static int twl4030_remove(struct i2c_cli
return 0;
}
+struct es_desc {
+ u8 nibble;
+ char name[4];
+};
+
+static const struct es_desc twl4030_es[] = {
+ { 0, "1.0", },
+ { 1, "2.x", },
+ { 4, "3.0", },
+ { 5, "3.1", },
+ { },
+};
+static const struct es_desc twl5030_es[] = {
+ { 0, "1.0", },
+ { 1, "1.1", },
+ { },
+};
+
+static u32 twl_id(struct device *dev)
+{
+ const u32 mask = ((1 << 16) - 1) << 12;
+ union { u8 bytes[4]; u32 word; } idcode;
+ int status;
+ u8 nibble;
+ char *chip;
+ const struct es_desc *desc;
+
+ status = twl4030_i2c_read(TWL4030_MODULE_INTBR,
+ idcode.bytes, 0, 4);
+ if (status < 0)
+ return 0;
+
+ idcode.word = le32_to_cpu(idcode.word),
+ nibble = idcode.word >> 28;
+
+ /* NOTE: TWL5030 / TPS65930 ES1.0 mis-identifies as TWL4030 */
+
+ if ((idcode.word & mask) == (0x0009002F & mask)) {
+ chip = "TWL4030";
+ desc = twl4030_es;
+ } else if ((idcode.word & mask) == (0x0009802F & mask)) {
+ chip = "TWL5030";
+ desc = twl5030_es;
+ } else {
+ chip = "unrecognized";
+ desc = NULL;
+ }
+
+ while (desc && desc->name[0]) {
+ if (desc->nibble == nibble) {
+ dev_info(dev, "%s ES %s; idcode %08x\n",
+ chip, desc->name, idcode.word);
+ return idcode.word;
+ }
+ desc++;
+ }
+ dev_info(dev, "%s; idcode %08x\n", chip, idcode.word);
+ return idcode.word;
+}
+
/* NOTE: this driver only handles a single twl4030/tps659x0 chip */
static int
twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id)
@@ -795,6 +855,8 @@ twl4030_probe(struct i2c_client *client,
if(0)dumpit();
+ twl_id(&client->dev);
+
/* setup clock framework */
clocks_init();
--
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