On Sat, 19 May 2012 23:54:36 -0600, Grant Likely [off-list ref] wrote:

On Fri, 11 May 2012 15:05:21 -0700, David Daney [off-list ref] wrote:

quoted

From: David Daney <redacted>

When generating MODALIASes, it is convenient to add things like "spi:"
or "i2c:" to the front of the strings.  This allows the standard
modprobe to find the right driver when automatically populating bus
children from the device tree structure.

Add a prefix parameter, and adjust callers.  For
of_register_spi_devices() use the "spi:" prefix.

Signed-off-by: David Daney <redacted>

Applied, thanks.  Some notes below...

Wait... why is this necessary?  The module type prefix isn't stored in
the modalias value for any other bus type as far as I can see, and
with this series it appears that the "spi:" prefix may or may not be
present in the modalias.  That doesn't look right.

Why isn't prefixing spi: at uevent time sufficient?  IIUC, modprobe
depends on either UEVENT or the modalias attribute to know which
driver to probe.  It does look like the attribute is missing the spi:
prefix though.  Does the following change work instead of these two
patches?

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 3d8f662..da8aac7 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c

@@ -51,7 +51,7 @@ modalias_show(struct device *dev, struct device_attribute *a, char *buf)
 {
        const struct spi_device *spi = to_spi_device(dev);
 
-       return sprintf(buf, "%s\n", spi->modalias);
+       return sprintf(buf, "%s%s\n", SPI_MODULE_PREFIX, spi->modalias);
 }

So, I've dropped this patch from my tree.  If the change above works
for you then I'll push it out.

g.