Subject: [REPOST PATCH 1/4] ARM: dts: DRA7: Add dsp1_system syscon node

From: [email-masked] (Suman Anna)
Date: Mon, 12 Oct 2015 17:32:59 -0500

Hi Tony,

On 10/12/2015 04:43 PM, Tony Lindgren wrote:
> * Suman Anna <[email-masked]> [151002 16:27]:
>> The DSP_SYSTEM sub-module is a dedicated system control logic
>> module present within a DRA7 DSP processor sub-system. This
>> module is responsible for power management, clock generation
>> and connection to the device PRCM module.
>>
>> Add a syscon node for this module for the DSP1 processor
>> sub-system. This is added as a syscon node as it is a common
>> configuration module that can be used by the different IOMMU
>> instances and the corresponding remoteproc device.
>>
>> The node is added to the common dra7.dtsi file, as the DSP1
>> processor sub-system is mostly common across all the variants
>> of the DRA7 SoC family.
>>
>> Signed-off-by: Suman Anna <[email-masked]>
>> ---
>>  arch/arm/boot/dts/dra7.dtsi | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
>> index e289c706d27d..62055094e8d5 100644
>> --- a/arch/arm/boot/dts/dra7.dtsi
>> +++ b/arch/arm/boot/dts/dra7.dtsi
>> @@ -292,6 +292,11 @@
>>  				#thermal-sensor-cells = <1>;
>>  		};
>>  
>> +		dsp1_system: dsp_system at 40d00000 {
>> +			compatible = "syscon";
>> +			reg = <0x40d00000 0x100>;
>> +		};
>> +
>>  		sdma: dma-controller at 4a056000 {
>>  			compatible = "ti,omap4430-sdma";
>>  			reg = <0x4a056000 0x1000>;
> 
> Hmm so why would you want to set up a complete device as a syscon
> mapping rather than just doing ioremap on it?
> 
> What drivers will be sharing access to these registers?

Two different instances of the MMU for now, both get probed
independently. But there are other registers which a remoteproc driver
will mostly be interested in (like DSP_SYS_STAT for knowing the C66x
idle/active status).

regards
Suman