Le 09/01/2012 11:10 AM, Jean-Christophe PLAGNIOL-VILLARD a écrit :

On 22:47 Fri 31 Aug     , Sylwester Nawrocki wrote:

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On 08/31/2012 04:51 PM, Nicolas Ferre wrote:

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diff --git a/arch/arm/mach-at91/at91rm9200.c b/arch/arm/mach-at91/at91rm9200.c
index f2112f9..0bc91e5 100644
--- a/arch/arm/mach-at91/at91rm9200.c
+++ b/arch/arm/mach-at91/at91rm9200.c

@@ -187,7 +187,7 @@ static struct clk_lookup periph_clocks_lookups[] = {
   	CLKDEV_CON_DEV_ID("pclk", "ssc.0",&ssc0_clk),
   	CLKDEV_CON_DEV_ID("pclk", "ssc.1",&ssc1_clk),
   	CLKDEV_CON_DEV_ID("pclk", "ssc.2",&ssc2_clk),
-	CLKDEV_CON_DEV_ID(NULL, "at91_i2c",&twi_clk),
+	CLKDEV_CON_DEV_ID(NULL, "at91rm9200_i2c",&twi_clk),

use i2c-xxx as on other drivers

and I do not like to have platform_device_id

Me, I like it and find this implementation very elegant.

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as we need to touch the driver to add a new soc

So what? We still keep the compatibility if the new SoC has it
compatibility assured with previous revision: there is nothing to modify.

I agree. The driver would need to be touched to support new SoC only if
the IP there have had some differences, which would have needed to be
resolved anyway.

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please use platform data

Using platform data for the dt platforms would have been more troublesome,
wouldn't it ? I like Ludovic's approach which handles both: dt and non-dt
cases in uniform way from the driver's POV.

no you will describe it via DT as done on all the other drivers

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No, it does not have to be exposed to the user: these data are highly
dependent on the actual hardware (IP revision in fact). So, no need to
mess with platform data.

no I really see no point on these list of platform_id it's does not look more
nice just more huggly to have x names. This is at the end the same as passing
platform data via soc info (add_xx or dtsi)

And here you just do the same as cpu_is via names.

The driver need to read IP revision instead

At the beginning it was planned to do this but:
- a new SoC, with a new IP version lead to update the driver also
- with the MCI driver which uses IP version, I have some cases where 
using the version was not enough, a SoC approach would be better. For 
instance, the IP version tells that we can use PDC feature but PDC is 
not connected.

Best Regards,
J.

Regards

Ludovic