Re: [PATCH v3] Add TI CDCE925 I2C controlled clock synthesizer driver

From: Mike Looijmans
Date: Tue Jun 02 2015 - 04:43:52 EST


ïOn 02-06-15 09:50, Paul Bolle wrote:
On Mon, 2015-06-01 at 12:13 +0200, Mike Looijmans wrote:
--- /dev/null
+++ b/drivers/clk/clk-cdce925.c

+static int cdce925_regmap_i2c_write(
+ void *context, const void *data, size_t count)

+ dev_dbg(&i2c->dev, "%s(%u) %#x %#x\n", __func__, count,
+ reg_data[0], reg_data[1]);

For some silly reason (ie, I mistakenly thought I spotted an issue) I
did a quick build of this file. That triggered some noise on x86_64.

Indeed, I hadn't verified building on a 64-bit platform, and the format string is incorrect.

Thanks for spotting it and suggesting a fix, I'll integrate it in a v4 patch.

Out of curiousity, I did try a compile on the x86 host, but couldn't select the driver because it depends on CONFIG_OF, so I just compiled if for the ARM target to verify that it still compiles in kernel 4.1. How did you manage to compile the driver on the x86?


Excerpt:

drivers/clk/clk-cdce925.c: In function âcdce925_regmap_i2c_writeâ:
include/linux/dynamic_debug.h:64:16: warning: format â%uâ expects argument of type âunsigned intâ, but argument 5 has type âsize_tâ [-Wformat=]
static struct _ddebug __aligned(8) \
^
[...]
drivers/clk/clk-cdce925.c:505:2: note: in expansion of macro âdev_dbgâ
dev_dbg(&i2c->dev, "%s(%u) %#x %#x\n", __func__, count,
^

A quick look at Documentation/printk-formats.txt suggested this (very
lightly tested) fix:
@@ -502,7 +502,7 @@ static int cdce925_regmap_i2c_write(
reg_data[0] = CDCE925_I2C_COMMAND_BYTE_TRANSFER | ((u8 *)data)[0];
reg_data[1] = ((u8 *)data)[1];

- dev_dbg(&i2c->dev, "%s(%u) %#x %#x\n", __func__, count,
+ dev_dbg(&i2c->dev, "%s(%zu) %#x %#x\n", __func__, count,
reg_data[0], reg_data[1]);

ret = i2c_master_send(i2c, reg_data, count);

+static int cdce925_regmap_i2c_read(void *context,
+ const void *reg, size_t reg_size, void *val, size_t val_size)

+ dev_dbg(&i2c->dev, "%s(%u, %u) %#x %#x\n", __func__,
+ reg_size, val_size, reg_data[0], *((u8 *)val));

Likewise:
@@ -547,7 +547,7 @@ static int cdce925_regmap_i2c_read(void *context,

ret = i2c_transfer(i2c->adapter, xfer, 2);
if (likely(ret == 2)) {
- dev_dbg(&i2c->dev, "%s(%u, %u) %#x %#x\n", __func__,
+ dev_dbg(&i2c->dev, "%s(%zu, %zu) %#x %#x\n", __func__,
reg_size, val_size, reg_data[0], *((u8 *)val));
return 0;
} else if (ret < 0)

Thanks,


Paul Bolle




Kind regards,

Mike Looijmans
System Expert

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