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SubjectRe: [PATCH v4 1/8] at91: dt: Adds support for the bus matrix declaration in the DT
On 12/02/2014 11:45, Gregory CLEMENT :
> Hi Jean-Jacques,
>
> Thanks for this new series, I have one little comment:
>
> On 12/02/2014 11:06, Jean-Jacques Hiblot wrote:
>> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
>> ---
>> arch/arm/mach-at91/setup.c | 23 +++++++++++++++++++++++
>> 1 file changed, 23 insertions(+)
>>
>> diff --git a/arch/arm/mach-at91/setup.c b/arch/arm/mach-at91/setup.c
>> index f7ca97b..b8d0b66 100644
>> --- a/arch/arm/mach-at91/setup.c
>> +++ b/arch/arm/mach-at91/setup.c
>> @@ -487,6 +487,28 @@ end:
>> of_node_put(np);
>> }
>>
>> +static struct of_device_id matrix_ids[] = {
>> + { .compatible = "atmel,at91sam9261-bus-matrix", },
>> + { /*sentinel*/ }

I think that we can introduce this compatible string with sam9260
product: "atmel,at91sam9260-bus-matrix".

In addition, can you add this new binding in the documentation file:
Documentation/devicetree/bindings/arm/atmel-at91.txt
(in another patch with the "dt: bindings: " subject prefix + add the DT
mailing-list: devicetree@vger.kernel.org).


>> +};
>> +
>> +static void at91_dt_matrix(void)
>> +{
>> + struct device_node *np;
>> +
>> + np = of_find_matching_node(NULL, matrix_ids);
>> + if (!np) {
>> + pr_debug("AT91: unable to find compatible bus matrix controller node in dtb\n");
>
> I think that a panic here should be more consistent with the next check.
> Indeed if it fails here then at91_matrix_base will be uninitialized too,
> and it will make the kernel crash when at91_matrix_base will be accessed.

Yes.

> Thanks,
>
> Gregory
>
>
>> + return;
>> + }
>> +
>> + at91_matrix_base = of_iomap(np, 0);
>> + if (!at91_matrix_base)
>> + panic("Impossible to ioremap at91_matrix_base\n");
>> +
>> + of_node_put(np);
>> +}
>> +
>> void __init at91rm9200_dt_initialize(void)
>> {
>> at91_dt_ramc();
>> @@ -506,6 +528,7 @@ void __init at91_dt_initialize(void)
>> at91_dt_rstc();
>> at91_dt_ramc();
>> at91_dt_shdwc();
>> + at91_dt_matrix();
>>
>> /* Init clock subsystem */
>> at91_dt_clock_init();
>>
>
>


--
Nicolas Ferre


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