[PATCH 05/11] dt-binding: Add ngpios property to GPIO controller node

Ray Jui rjui at broadcom.com
Thu Oct 22 11:52:02 PDT 2015

On 10/22/2015 11:43 AM, Rob Herring wrote:
> On Mon, Oct 19, 2015 at 12:43 AM, Pramod Kumar <pramodku at broadcom.com> wrote:
>> Add ngpios property to the gpio controller's DT node so that controller
>> driver extracts total number of gpio lines present in controller
>> from DT and removes dependency on driver.
>> Signed-off-by: Pramod Kumar <pramodku at broadcom.com>
>> Reviewed-by: Ray Jui <rjui at broadcom.com>
>> Reviewed-by: Scott Branden <sbranden at broadcom.com>
>> ---
>>   Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt | 5 +++++
>>   1 file changed, 5 insertions(+)
>> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
>> index f92b833..655a8d7 100644
>> --- a/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
>> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,cygnus-gpio.txt
>> @@ -10,6 +10,9 @@ Required properties:
>>       Define the base and range of the I/O address space that contains the Cygnus
>>   GPIO/PINCONF controller registers
>> +- ngpios:
>> +    Total number of GPIOs the controller provides
> This must be optional for compatibility and the driver needs to handle
> it not present.

You meant to be compatible with existing Cygnus devices, correct?

Just to clarify, here you suggest we still leave the existing hard coded 
ngpios in the driver, in order to be compatible with all existing Cygnus 
devices (while the Cygnus device tree changes to use ngpio is still 
being merged and through different maintainer), and have all new iProc 
SoCs switch to use ngpios from device tree, right?



More information about the linux-arm-kernel mailing list