[PATCH 0/3] ARM: dts/keystone: Introduce SoC specific compatible matches

[PATCH 0/3] ARM: dts/keystone: Introduce SoC specific compatible matches

[Nishanth Menon]

Hi,
Here is a series that introduces keystone SoC specific compatible flags

Series based on v4.3-rc1.

Test log(merge on master): http://paste.ubuntu.org.cn/3462285 (note
netcp seems to freezeup after a while into boot. debug not complete on
that yet - boots fine with a minimal system..)

Nishanth Menon (3):
  Documentation: dt: keystone: provide SoC specific compatible flags
  ARM: keystone: Update compatible to have SoC specific matches
  ARM: dts: keystone: Update SoC specific compatible flags

 .../devicetree/bindings/arm/keystone/keystone.txt    | 20 +++++++++++++++++---
 arch/arm/boot/dts/k2e-evm.dts                        |  2 +-
 arch/arm/boot/dts/k2e.dtsi                           |  3 +++
 arch/arm/boot/dts/k2hk-evm.dts                       |  2 +-
 arch/arm/boot/dts/k2hk.dtsi                          |  3 +++
 arch/arm/boot/dts/k2l-evm.dts                        |  2 +-
 arch/arm/boot/dts/k2l.dtsi                           |  3 +++
 arch/arm/boot/dts/keystone.dtsi                      |  1 +
 arch/arm/mach-keystone/keystone.c                    |  3 +++
 9 files changed, 33 insertions(+), 6 deletions(-)

-- 
2.1.4

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[PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[Nishanth Menon]

Keystone2 devices are used on more platforms than just Texas
Instruments reference evaluation platforms called EVMs. Providing a
generic compatible "ti,keystone" is not sufficient to differentiate
various SoC definitions possible on various platforms. So, provide
compatible matches for each SoC family by itself.

This allows SoC specific logic to be run time handled based on
of_machine_is_compatible("ti,k2hk") or as needed for the dependent
processor instead of needing to use board dependent compatibles that
are needed now.

Signed-off-by: Nishanth Menon <nm@ti.com>
---
 .../devicetree/bindings/arm/keystone/keystone.txt    | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/keystone/keystone.txt b/Documentation/devicetree/bindings/arm/keystone/keystone.txt
index 59d7a46f85eb..800d2d02e27b 100644
--- a/Documentation/devicetree/bindings/arm/keystone/keystone.txt
+++ b/Documentation/devicetree/bindings/arm/keystone/keystone.txt
@@ -9,12 +9,26 @@ Required properties:
    the form "ti,keystone-*". Generic devices like gic, arch_timers, ns16550
    type UART should use the specified compatible for those devices.
 
+SoC families:
+
+- Keystone 2 generic SoC:
+   compatible = "ti,keystone"
+
+SoCs:
+
+- Keystone 2 Hawking/Kepler
+   compatible = ti,k2hk", "ti,keystone"
+- Keystone 2 Lamarr
+   compatible = ti,k2l", "ti,keystone"
+- Keystone 2 Edison
+   compatible = ti,k2e", "ti,keystone"
+
 Boards:
 -  Keystone 2 Hawking/Kepler EVM
-   compatible = "ti,k2hk-evm","ti,keystone"
+   compatible = "ti,k2hk-evm", "ti,k2hk", "ti,keystone"
 
 -  Keystone 2 Lamarr EVM
-   compatible = "ti,k2l-evm","ti,keystone"
+   compatible = "ti,k2l-evm", "ti, k2l", "ti,keystone"
 
 -  Keystone 2 Edison EVM
-   compatible = "ti,k2e-evm","ti,keystone"
+   compatible = "ti,k2e-evm", "ti,k2e", "ti,keystone"
-- 
2.1.4

[PATCH 2/3] ARM: keystone: Update compatible to have SoC specific matches

[Nishanth Menon]

With future SoCs of keystone2 family, the generic compatible match may
not be sufficient to handle SoC specific handling. So introduce matches
based on SoC compatiblity.

Signed-off-by: Nishanth Menon <nm@ti.com>
---
 arch/arm/mach-keystone/keystone.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/mach-keystone/keystone.c b/arch/arm/mach-keystone/keystone.c
index e288010522f9..c279293f084c 100644
--- a/arch/arm/mach-keystone/keystone.c
+++ b/arch/arm/mach-keystone/keystone.c
@@ -97,6 +97,9 @@ static long long __init keystone_pv_fixup(void)
 }
 
 static const char *const keystone_match[] __initconst = {
+	"ti,k2hk",
+	"ti,k2e",
+	"ti,k2l",
 	"ti,keystone",
 	NULL,
 };
-- 
2.1.4

[PATCH 3/3] ARM: dts: keystone: Update SoC specific compatible flags

[Nishanth Menon]

Update the compatible flags to allow specific SoC identification.

Signed-off-by: Nishanth Menon <nm@ti.com>
---
 arch/arm/boot/dts/k2e-evm.dts   | 2 +-
 arch/arm/boot/dts/k2e.dtsi      | 3 +++
 arch/arm/boot/dts/k2hk-evm.dts  | 2 +-
 arch/arm/boot/dts/k2hk.dtsi     | 3 +++
 arch/arm/boot/dts/k2l-evm.dts   | 2 +-
 arch/arm/boot/dts/k2l.dtsi      | 3 +++
 arch/arm/boot/dts/keystone.dtsi | 1 +
 7 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/k2e-evm.dts b/arch/arm/boot/dts/k2e-evm.dts
index 50c83c21d911..b7e99807f5c2 100644
--- a/arch/arm/boot/dts/k2e-evm.dts
+++ b/arch/arm/boot/dts/k2e-evm.dts
@@ -13,7 +13,7 @@
 #include "k2e.dtsi"
 
 / {
-	compatible =  "ti,k2e-evm","ti,keystone";
+	compatible = "ti,k2e-evm", "ti,k2e", "ti,keystone";
 	model = "Texas Instruments Keystone 2 Edison EVM";
 
 	soc {
diff --git a/arch/arm/boot/dts/k2e.dtsi b/arch/arm/boot/dts/k2e.dtsi
index 675fb8e492c6..1097dada56d2 100644
--- a/arch/arm/boot/dts/k2e.dtsi
+++ b/arch/arm/boot/dts/k2e.dtsi
@@ -9,6 +9,9 @@
  */
 
 / {
+	compatible = "ti,k2e", "ti,keystone";
+	model = "Texas Instruments Keystone 2 Edison SoC";
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
diff --git a/arch/arm/boot/dts/k2hk-evm.dts b/arch/arm/boot/dts/k2hk-evm.dts
index 660ebf58d547..8161bf53271b 100644
--- a/arch/arm/boot/dts/k2hk-evm.dts
+++ b/arch/arm/boot/dts/k2hk-evm.dts
@@ -13,7 +13,7 @@
 #include "k2hk.dtsi"
 
 / {
-	compatible =  "ti,k2hk-evm","ti,keystone";
+	compatible =  "ti,k2hk-evm", "ti,k2hk", "ti,keystone";
 	model = "Texas Instruments Keystone 2 Kepler/Hawking EVM";
 
 	soc {
diff --git a/arch/arm/boot/dts/k2hk.dtsi b/arch/arm/boot/dts/k2hk.dtsi
index d0810a5f2968..ada4c7ac96e7 100644
--- a/arch/arm/boot/dts/k2hk.dtsi
+++ b/arch/arm/boot/dts/k2hk.dtsi
@@ -9,6 +9,9 @@
  */
 
 / {
+	compatible = "ti,k2hk", "ti,keystone";
+	model = "Texas Instruments Keystone 2 Kepler/Hawking SoC";
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
diff --git a/arch/arm/boot/dts/k2l-evm.dts b/arch/arm/boot/dts/k2l-evm.dts
index 9a69a6b55374..00861244d788 100644
--- a/arch/arm/boot/dts/k2l-evm.dts
+++ b/arch/arm/boot/dts/k2l-evm.dts
@@ -13,7 +13,7 @@
 #include "k2l.dtsi"
 
 / {
-	compatible =  "ti,k2l-evm","ti,keystone";
+	compatible = "ti,k2l-evm", "ti,k2l", "ti,keystone";
 	model = "Texas Instruments Keystone 2 Lamarr EVM";
 
 	soc {
diff --git a/arch/arm/boot/dts/k2l.dtsi b/arch/arm/boot/dts/k2l.dtsi
index 49fd414f680c..4446da72b0ae 100644
--- a/arch/arm/boot/dts/k2l.dtsi
+++ b/arch/arm/boot/dts/k2l.dtsi
@@ -9,6 +9,9 @@
  */
 
 / {
+	compatible = "ti,k2l", "ti,keystone";
+	model = "Texas Instruments Keystone 2 Lamarr SoC";
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
diff --git a/arch/arm/boot/dts/keystone.dtsi b/arch/arm/boot/dts/keystone.dtsi
index 72816d65f7ec..ff91f703d371 100644
--- a/arch/arm/boot/dts/keystone.dtsi
+++ b/arch/arm/boot/dts/keystone.dtsi
@@ -12,6 +12,7 @@
 #include "skeleton.dtsi"
 
 / {
+	compatible = "ti,keystone";
 	model = "Texas Instruments Keystone 2 SoC";
 	#address-cells = <2>;
 	#size-cells = <2>;
-- 
2.1.4

Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[Murali Karicheri]

On 09/22/2015 12:08 PM, Nishanth Menon wrote:
> Keystone2 devices are used on more platforms than just Texas
> Instruments reference evaluation platforms called EVMs. Providing a
> generic compatible "ti,keystone" is not sufficient to differentiate
> various SoC definitions possible on various platforms. So, provide
> compatible matches for each SoC family by itself.
>
> This allows SoC specific logic to be run time handled based on
> of_machine_is_compatible("ti,k2hk") or as needed for the dependent
> processor instead of needing to use board dependent compatibles that
> are needed now.
>
> Signed-off-by: Nishanth Menon <nm@ti.com>
> ---
>   .../devicetree/bindings/arm/keystone/keystone.txt    | 20 +++++++++++++++++---
>   1 file changed, 17 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/keystone/keystone.txt b/Documentation/devicetree/bindings/arm/keystone/keystone.txt
> index 59d7a46f85eb..800d2d02e27b 100644
> --- a/Documentation/devicetree/bindings/arm/keystone/keystone.txt
> +++ b/Documentation/devicetree/bindings/arm/keystone/keystone.txt
> @@ -9,12 +9,26 @@ Required properties:
>      the form "ti,keystone-*". Generic devices like gic, arch_timers, ns16550
>      type UART should use the specified compatible for those devices.
>
> +SoC families:
> +
> +- Keystone 2 generic SoC:
> +   compatible = "ti,keystone"
> +
> +SoCs:
> +
> +- Keystone 2 Hawking/Kepler
> +   compatible = ti,k2hk", "ti,keystone"
> +- Keystone 2 Lamarr
> +   compatible = ti,k2l", "ti,keystone"
> +- Keystone 2 Edison
> +   compatible = ti,k2e", "ti,keystone"
> +
>   Boards:
>   -  Keystone 2 Hawking/Kepler EVM
> -   compatible = "ti,k2hk-evm","ti,keystone"
> +   compatible = "ti,k2hk-evm", "ti,k2hk", "ti,keystone"
>
>   -  Keystone 2 Lamarr EVM
> -   compatible = "ti,k2l-evm","ti,keystone"
> +   compatible = "ti,k2l-evm", "ti, k2l", "ti,keystone"
>
>   -  Keystone 2 Edison EVM
> -   compatible = "ti,k2e-evm","ti,keystone"
> +   compatible = "ti,k2e-evm", "ti,k2e", "ti,keystone"
>
DTS takes care of the difference in the hardware and If there SoC 
specific customization required outside this, then it is best to include 
this as part of that change. In the past, I believe we didn't do it due 
to the same reason as above.

Murali

-- 
Murali Karicheri
Linux Kernel, Keystone

Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[santosh shilimkar]

Nishant,

On 9/22/2015 9:08 AM, Nishanth Menon wrote:
> Keystone2 devices are used on more platforms than just Texas
> Instruments reference evaluation platforms called EVMs. Providing a
> generic compatible "ti,keystone" is not sufficient to differentiate
> various SoC definitions possible on various platforms. So, provide
> compatible matches for each SoC family by itself.
>
> This allows SoC specific logic to be run time handled based on
> of_machine_is_compatible("ti,k2hk") or as needed for the dependent
> processor instead of needing to use board dependent compatibles that
> are needed now.
>
> Signed-off-by: Nishanth Menon <nm-l0cyMroinI0@public.gmane.org>
> ---
You need to expand that 'not sufficient' for me. Unless there is
genuine case to support this, I would want to avoid this churn.

Regards,
Santosh
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Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[Nishanth Menon]

On 09/23/2015 01:05 PM, Murali Karicheri wrote:
> On 09/22/2015 12:08 PM, Nishanth Menon wrote:
[...]

>> diff --git
>> a/Documentation/devicetree/bindings/arm/keystone/keystone.txt
>> b/Documentation/devicetree/bindings/arm/keystone/keystone.txt
>> index 59d7a46f85eb..800d2d02e27b 100644
>> --- a/Documentation/devicetree/bindings/arm/keystone/keystone.txt
>> +++ b/Documentation/devicetree/bindings/arm/keystone/keystone.txt
>> @@ -9,12 +9,26 @@ Required properties:
>>      the form "ti,keystone-*". Generic devices like gic, arch_timers,
>> ns16550
>>      type UART should use the specified compatible for those devices.
>>
>> +SoC families:
>> +
>> +- Keystone 2 generic SoC:
>> +   compatible = "ti,keystone"
>> +
>> +SoCs:
>> +
>> +- Keystone 2 Hawking/Kepler
>> +   compatible = ti,k2hk", "ti,keystone"
>> +- Keystone 2 Lamarr
>> +   compatible = ti,k2l", "ti,keystone"
>> +- Keystone 2 Edison
>> +   compatible = ti,k2e", "ti,keystone"
>> +
>>   Boards:
>>   -  Keystone 2 Hawking/Kepler EVM
>> -   compatible = "ti,k2hk-evm","ti,keystone"
>> +   compatible = "ti,k2hk-evm", "ti,k2hk", "ti,keystone"
>>
>>   -  Keystone 2 Lamarr EVM
>> -   compatible = "ti,k2l-evm","ti,keystone"
>> +   compatible = "ti,k2l-evm", "ti, k2l", "ti,keystone"
>>
>>   -  Keystone 2 Edison EVM
>> -   compatible = "ti,k2e-evm","ti,keystone"
>> +   compatible = "ti,k2e-evm", "ti,k2e", "ti,keystone"
>>
> DTS takes care of the difference in the hardware and If there SoC
> specific customization required outside this, then it is best to include
> this as part of that change. In the past, I believe we didn't do it due
> to the same reason as above.

Right now, they all claim to be the same keystone SoC -> which is
inaccurate at the very least, and downright wrong IMHO since k2e/hk and
l are different SoCs - even though they belong to keystone family, they
are as similar as OMAP4 is to OMAP5 is to DRA7. This is similar to how
various other SoCs distinguish between SoCs as well.

-- 
Regards,
Nishanth Menon
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Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[Murali Karicheri]

On 09/23/2015 02:19 PM, santosh shilimkar wrote:
> Nishant,
>
> On 9/22/2015 9:08 AM, Nishanth Menon wrote:
>> Keystone2 devices are used on more platforms than just Texas
>> Instruments reference evaluation platforms called EVMs. Providing a
>> generic compatible "ti,keystone" is not sufficient to differentiate
>> various SoC definitions possible on various platforms. So, provide
>> compatible matches for each SoC family by itself.
>>
>> This allows SoC specific logic to be run time handled based on
>> of_machine_is_compatible("ti,k2hk") or as needed for the dependent
>> processor instead of needing to use board dependent compatibles that
>> are needed now.
>>
>> Signed-off-by: Nishanth Menon <nm@ti.com>
>> ---
> You need to expand that 'not sufficient' for me. Unless there is
> genuine case to support this, I would want to avoid this churn.
>

I agree. If there are run time check required in code to treat the 
variants of Keystone SoC differently, then this change is needed. At 
this time, SoC DTS captures these differences. IMHO, If a future 
Keystone SoC support required SoC specific compatibility string to 
customize SoC specific initialization code, then it can be introduced at 
that time. I am not sure why this is introduced with out an example usage.

> Regards,
> Santosh
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>
>


-- 
Murali Karicheri
Linux Kernel, Keystone

Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[Nishanth Menon]

On 09/24/2015 09:05 AM, Murali Karicheri wrote:
> On 09/23/2015 02:19 PM, santosh shilimkar wrote:
>> Nishant,
>>
>> On 9/22/2015 9:08 AM, Nishanth Menon wrote:
>>> Keystone2 devices are used on more platforms than just Texas
>>> Instruments reference evaluation platforms called EVMs. Providing a
>>> generic compatible "ti,keystone" is not sufficient to differentiate
>>> various SoC definitions possible on various platforms. So, provide
>>> compatible matches for each SoC family by itself.
>>>
>>> This allows SoC specific logic to be run time handled based on
>>> of_machine_is_compatible("ti,k2hk") or as needed for the dependent
>>> processor instead of needing to use board dependent compatibles that
>>> are needed now.
>>>
>>> Signed-off-by: Nishanth Menon <nm-l0cyMroinI0@public.gmane.org>
>>> ---
>> You need to expand that 'not sufficient' for me. Unless there is
>> genuine case to support this, I would want to avoid this churn.
>>
> 
> I agree. If there are run time check required in code to treat the 
> variants of Keystone SoC differently, then this change is needed. At 
> this time, SoC DTS captures these differences. IMHO, If a future 
> Keystone SoC support required SoC specific compatibility string to 
> customize SoC specific initialization code, then it can be introduced at 
> that time. I am not sure why this is introduced with out an example usage.

a) See
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/usage-model.txt#n116
-> all we have today is board, soc generic family. The generic
compatible flag of ti,keystone to mark that this is a keystone2 device
does not identify that what kind of soc it is. which is what this
series introduces.

b) there is no realistic way for user space applications such as a
test framework or other SoC based applications in a generic distro to
detect the right SoC this platform is running on - imagine writing SoC
specific code that depends on board compatible flags - there is never
an end to that story as the number of boards expand.

c) Ideally we will try never to introduce code that will have to
depend on SoC compatible flag based match in kernel - but that is not
a reason not to follow guidelines provided by devicetree documentation
to provide SoC specific compatible flags.

-- 
Regards,
Nishanth Menon
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Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[Murali Karicheri]

Nishanth,

On 09/24/2015 10:20 AM, Nishanth Menon wrote:
> On 09/24/2015 09:05 AM, Murali Karicheri wrote:
>> On 09/23/2015 02:19 PM, santosh shilimkar wrote:
>>> Nishant,
>>>
>>> On 9/22/2015 9:08 AM, Nishanth Menon wrote:
>>>> Keystone2 devices are used on more platforms than just Texas
>>>> Instruments reference evaluation platforms called EVMs. Providing a
>>>> generic compatible "ti,keystone" is not sufficient to differentiate
>>>> various SoC definitions possible on various platforms. So, provide
>>>> compatible matches for each SoC family by itself.
>>>>
>>>> This allows SoC specific logic to be run time handled based on
>>>> of_machine_is_compatible("ti,k2hk") or as needed for the dependent
>>>> processor instead of needing to use board dependent compatibles that
>>>> are needed now.
>>>>
>>>> Signed-off-by: Nishanth Menon <nm@ti.com>
>>>> ---
>>> You need to expand that 'not sufficient' for me. Unless there is
>>> genuine case to support this, I would want to avoid this churn.
>>>
>>
>> I agree. If there are run time check required in code to treat the
>> variants of Keystone SoC differently, then this change is needed. At
>> this time, SoC DTS captures these differences. IMHO, If a future
>> Keystone SoC support required SoC specific compatibility string to
>> customize SoC specific initialization code, then it can be introduced at
>> that time. I am not sure why this is introduced with out an example usage.
>
> a) See
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/usage-model.txt#n116
> -> all we have today is board, soc generic family. The generic
> compatible flag of ti,keystone to mark that this is a keystone2 device
> does not identify that what kind of soc it is. which is what this
> series introduces.
>
> b) there is no realistic way for user space applications such as a
> test framework or other SoC based applications in a generic distro to
> detect the right SoC this platform is running on - imagine writing SoC
> specific code that depends on board compatible flags - there is never
> an end to that story as the number of boards expand.
>
> c) Ideally we will try never to introduce code that will have to
> depend on SoC compatible flag based match in kernel - but that is not
> a reason not to follow guidelines provided by devicetree documentation
> to provide SoC specific compatible flags.
>

Thanks for pointing out the link which provided me some thing to cross 
check my argument.

The relevant description from the above quoted below for discussion.
===================== Cut from the above ===============================

The 'compatible' property contains a sorted list of strings starting
with the exact name of the machine, followed by an optional list of
boards it is compatible with sorted from most compatible to least.  For
example, the root compatible properties for the TI BeagleBoard and its
successor, the BeagleBoard xM board might look like, respectively:

	compatible = "ti,omap3-beagleboard", "ti,omap3450", "ti,omap3";
	compatible = "ti,omap3-beagleboard-xm", "ti,omap3450", "ti,omap3";

Where "ti,omap3-beagleboard-xm" specifies the exact model, it also
claims that it compatible with the OMAP 3450 SoC, and the omap3 family
of SoCs in general.  You'll notice that the list is sorted from most
specific (exact board) to least specific (SoC family).

=======================================================================

So in keystone case, we have

     "ti,k2hk-evm","ti,keystone";

IMO, this is consistent with the above description as ti,k2hk-evm 
describes the board exactly and ti,keystone is the optional list which 
is a generic SoC name.

=========================== Cut from the above==========================

The reasoning behind this scheme is the observation that in the majority
of cases, a single machine_desc can support a large number of boards
if they all use the same SoC, or same family of SoCs.  However,
invariably there will be some exceptions where a specific board will
require special setup code that is not useful in the generic case.
Special cases could be handled by explicitly checking for the
troublesome board(s) in generic setup code, but doing so very quickly
becomes ugly and/or unmaintainable if it is more than just a couple of
cases.

Instead, the compatible list allows a generic machine_desc to provide
support for a wide common set of boards by specifying "less
compatible" values in the dt_compat list.  In the example above,
generic board support can claim compatibility with "ti,omap3" or
"ti,omap3450".  If a bug was discovered on the original beagleboard
that required special workaround code during early boot, then a new
machine_desc could be added which implements the workarounds and only
matches on "ti,omap3-beagleboard".
=======================================================================

This is how interpret the above.

ti,omap3 is the family of omap3 devices similar to keystone. ti,omap3450 
is required if there is an exceptional treatment required for ti,omap3450.

In keystone case so far there is no case of exceptional treatment 
required in the code for a specific SoC. So a generic name, ti,keystone 
is used. When exceptional treatment is needed in the future, for example 
k2hk Soc, we should introduce SoC specific string in the following order.

"ti,k2hk-evm", "ti,k2hk", "ti,keystone"

So unless there is an exception, there is no need for a SoC specific 
string in the compatibility string list. So this can be added later if 
there is need for exceptional treatment. Did I get it wrong?

-- 
Murali Karicheri
Linux Kernel, Keystone

Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[Nishanth Menon]

On 09/24/2015 10:54 AM, Murali Karicheri wrote:
[...]
> ti,omap3 is the family of omap3 devices similar to keystone. ti,omap3450
> is required if there is an exceptional treatment required for ti,omap3450.
> 
> In keystone case so far there is no case of exceptional treatment
> required in the code for a specific SoC. So a generic name, ti,keystone
> is used. When exceptional treatment is needed in the future, for example
> k2hk Soc, we should introduce SoC specific string in the following order.

Did you do a grep on the code to see?
$ git grep ti,omap3 arch/arm/mach-omap2/
           arch/arm/mach-omap2/board-generic.c:    "ti,omap3430",
arch/arm/mach-omap2/board-generic.c:    "ti,omap3",
arch/arm/mach-omap2/board-generic.c:    "ti,omap36xx",
arch/arm/mach-omap2/board-generic.c:    "ti,omap3-beagle",

This is the same as keystone's device support. even though only 36xx was
needed, we introduced other SoC specific compatibility match.

> "ti,k2hk-evm", "ti,k2hk", "ti,keystone"
> 
> So unless there is an exception, there is no need for a SoC specific
> string in the compatibility string list. So this can be added later if
> there is need for exceptional treatment. Did I get it wrong?
> 

I see both your views seem to be "if we dont need a compatible" dont add
it. My view was based on "be accurate in the hardware description"

OK - i will probably agree on the topic. But, how about userspace
needing to know which SoC they are on, without needing to depend on
board->soc mapping? How do we help resolve that?

-- 
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Nishanth Menon
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Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[santosh shilimkar]

On 9/25/2015 7:50 AM, Nishanth Menon wrote:
> On 09/24/2015 10:54 AM, Murali Karicheri wrote:
> [...]
>> ti,omap3 is the family of omap3 devices similar to keystone. ti,omap3450
>> is required if there is an exceptional treatment required for ti,omap3450.
>>
>> In keystone case so far there is no case of exceptional treatment
>> required in the code for a specific SoC. So a generic name, ti,keystone
>> is used. When exceptional treatment is needed in the future, for example
>> k2hk Soc, we should introduce SoC specific string in the following order.
>
> Did you do a grep on the code to see?
> $ git grep ti,omap3 arch/arm/mach-omap2/
>             arch/arm/mach-omap2/board-generic.c:    "ti,omap3430",
> arch/arm/mach-omap2/board-generic.c:    "ti,omap3",
> arch/arm/mach-omap2/board-generic.c:    "ti,omap36xx",
> arch/arm/mach-omap2/board-generic.c:    "ti,omap3-beagle",
>
> This is the same as keystone's device support. even though only 36xx was
> needed, we introduced other SoC specific compatibility match.
>
>> "ti,k2hk-evm", "ti,k2hk", "ti,keystone"
>>
>> So unless there is an exception, there is no need for a SoC specific
>> string in the compatibility string list. So this can be added later if
>> there is need for exceptional treatment. Did I get it wrong?
>>
>
> I see both your views seem to be "if we dont need a compatible" dont add
> it. My view was based on "be accurate in the hardware description"
>
> OK - i will probably agree on the topic. But, how about userspace
> needing to know which SoC they are on, without needing to depend on
> board->soc mapping? How do we help resolve that?
>
Why the user space should care about exact SOC ?

Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[Nishanth Menon]

On 09/25/2015 10:18 AM, santosh shilimkar wrote:
> On 9/25/2015 7:50 AM, Nishanth Menon wrote:
[...]
>> But, how about userspace
>> needing to know which SoC they are on, without needing to depend on
>> board->soc mapping? How do we help resolve that?
>>
> Why the user space should care about exact SOC ?

examples vary - trivial one is: debug tools like omapconf[1] or testing
tools like opentest[2] need some standard way to ensure Linux kernel is
functional - trusting the least set of parameters is usually what we
would prefer. while building a generic distro such as debian or yocto,
one prefers NOT to need to do a package build per SoC/perboard - that
never scales. instead, you'd like the same application run on different
systems dynamically.


[1] https://github.com/omapconf/omapconf
[2] http://arago-project.org/wiki/index.php/Opentest
-- 
Regards,
Nishanth Menon

Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[santosh shilimkar]

9/25/2015 9:01 AM, Nishanth Menon wrote:
> On 09/25/2015 10:18 AM, santosh shilimkar wrote:
>> On 9/25/2015 7:50 AM, Nishanth Menon wrote:
> [...]
>>> But, how about userspace
>>> needing to know which SoC they are on, without needing to depend on
>>> board->soc mapping? How do we help resolve that?
>>>
>> Why the user space should care about exact SOC ?
>
> examples vary - trivial one is: debug tools like omapconf[1] or testing
> tools like opentest[2] need some standard way to ensure Linux kernel is
> functional - trusting the least set of parameters is usually what we
> would prefer. while building a generic distro such as debian or yocto,
> one prefers NOT to need to do a package build per SoC/perboard - that
> never scales. instead, you'd like the same application run on different
> systems dynamically.
>
I guessed omapconf example is coming though Keystone has no such tool
yet ;-). Opentest shouldn't need that info either.

I do agree that having a soc along with board is useful in
longer run to accommodation more boards and variants.
And only on that merit, I am willing to take these patches.

Please refresh the series commit messages based on the
discussion so far and repost. Will pick it up then.

Regards,
Santosh
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Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[Nishanth Menon]

On 09/25/2015 11:15 AM, santosh shilimkar wrote:
> 9/25/2015 9:01 AM, Nishanth Menon wrote:
>> On 09/25/2015 10:18 AM, santosh shilimkar wrote:
>>> On 9/25/2015 7:50 AM, Nishanth Menon wrote:
>> [...]
>>>> But, how about userspace
>>>> needing to know which SoC they are on, without needing to depend on
>>>> board->soc mapping? How do we help resolve that?
>>>>
>>> Why the user space should care about exact SOC ?
>>
>> examples vary - trivial one is: debug tools like omapconf[1] or testing
>> tools like opentest[2] need some standard way to ensure Linux kernel is
>> functional - trusting the least set of parameters is usually what we
>> would prefer. while building a generic distro such as debian or yocto,
>> one prefers NOT to need to do a package build per SoC/perboard - that
>> never scales. instead, you'd like the same application run on different
>> systems dynamically.
>>
> I guessed omapconf example is coming though Keystone has no such tool

:) That is true - as of now. maynot be the case for future.

> yet ;-). Opentest shouldn't need that info either.

we did debate this on opentest, but we could not implement anything
since we did not have a consistent solution yet.

> I do agree that having a soc along with board is useful in
> longer run to accommodation more boards and variants.
> And only on that merit, I am willing to take these patches.
> 
> Please refresh the series commit messages based on the
> discussion so far and repost. Will pick it up then.
> 
Thanks. I will do so (probably early next week)..


-- 
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Nishanth Menon
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Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[Murali Karicheri]

On 09/25/2015 12:01 PM, Nishanth Menon wrote:
> On 09/25/2015 10:18 AM, santosh shilimkar wrote:
>> On 9/25/2015 7:50 AM, Nishanth Menon wrote:
> [...]
>>> But, how about userspace
>>> needing to know which SoC they are on, without needing to depend on
>>> board->soc mapping? How do we help resolve that?
Believe it or not, user space tools that are custom to a specific SoC 
would require such knowledge. So I agree on this front that a SoC 
specific compatibility is cool to have. I think that should have been 
clear in the commit description.

My Acked-By: Murali Karicheri <m-karicheri2-l0cyMroinI0@public.gmane.org>

>>>
>> Why the user space should care about exact SOC ?
>
> examples vary - trivial one is: debug tools like omapconf[1] or testing
> tools like opentest[2] need some standard way to ensure Linux kernel is
> functional - trusting the least set of parameters is usually what we
> would prefer. while building a generic distro such as debian or yocto,
> one prefers NOT to need to do a package build per SoC/perboard - that
> never scales. instead, you'd like the same application run on different
> systems dynamically.
>
>
> [1] https://github.com/omapconf/omapconf
> [2] http://arago-project.org/wiki/index.php/Opentest
>


-- 
Murali Karicheri
Linux Kernel, Keystone
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Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[santosh shilimkar]

Nishant,

On 9/25/2015 10:38 AM, Nishanth Menon wrote:
> On 09/25/2015 11:15 AM, santosh shilimkar wrote:
>> 9/25/2015 9:01 AM, Nishanth Menon wrote:

[..]

>> Please refresh the series commit messages based on the
>> discussion so far and repost. Will pick it up then.
>>
> Thanks. I will do so (probably early next week)..
>
Just want to check if you have series ready. I was planning
to make queue ready over the weekend for upcoming merge
window. I can hold that for another week though so let
me know.

Regards,
Santosh

[PATCH V2 0/3] ARM: dts/keystone: Introduce SoC specific compatible matches

[Nishanth Menon]

Hi,

Round 2 of the series with updated patch #1. This series introduces
SoC specific dt compatible property to allow for future SoCs to be
handled and for userspace applications that can introduce features
based on SoC they are functioning on.

V1 of the series: http://marc.info/?l=devicetree&m=144309031109988&w=2
V2 of the series has the following changes:
	- updated commit message in patch #1
	- picked up acked-by for patch #1

Series based on v4.3-rc1

Tested on v4.3-rc3: http://pastebin.ubuntu.com/12659000/

Nishanth Menon (3):
  Documentation: dt: keystone: provide SoC specific compatible flags
  ARM: keystone: Update compatible to have SoC specific matches
  ARM: dts: keystone: Update SoC specific compatible flags

 .../devicetree/bindings/arm/keystone/keystone.txt    | 20 +++++++++++++++++---
 arch/arm/boot/dts/k2e-evm.dts                        |  2 +-
 arch/arm/boot/dts/k2e.dtsi                           |  3 +++
 arch/arm/boot/dts/k2hk-evm.dts                       |  2 +-
 arch/arm/boot/dts/k2hk.dtsi                          |  3 +++
 arch/arm/boot/dts/k2l-evm.dts                        |  2 +-
 arch/arm/boot/dts/k2l.dtsi                           |  3 +++
 arch/arm/boot/dts/keystone.dtsi                      |  1 +
 arch/arm/mach-keystone/keystone.c                    |  3 +++
 9 files changed, 33 insertions(+), 6 deletions(-)

-- 
2.1.4

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[PATCH V2 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[Nishanth Menon]

Keystone2 devices are used on more platforms than just Texas
Instruments reference evaluation platforms called EVMs. Providing a
generic compatible "ti,keystone" is not sufficient to differentiate
various SoC definitions possible on various platforms for the
following reasons:
a) Userspace applications have no way of knowing which SoC they are
functioning, providing the compatible matches provide a mechanism for
them to enable SoC specific functionality. Such userspace applications
are typically automated test framework or SoC custom hardware
acceleration entitlement from a common file system.
b) Provides an accurate hardware description. This allows
SoC specific logic to be run time handled based on
of_machine_is_compatible("ti,k2hk") or as needed for the dependent
processor instead of needing to use board dependent compatibles that
are needed now.

Hence, provide compatible matches for each SoC in the Keystone family.

Acked-By: Murali Karicheri <m-karicheri2-l0cyMroinI0@public.gmane.org>
Signed-off-by: Nishanth Menon <nm-l0cyMroinI0@public.gmane.org>
---

Changes since V2:
	- elaborated reasoning why this change is useful - highlighted
	  potential userspace usage as well.
	- picked up Acked-by from Murali

V1: https://patchwork.kernel.org/patch/7240891/

 .../devicetree/bindings/arm/keystone/keystone.txt    | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/keystone/keystone.txt b/Documentation/devicetree/bindings/arm/keystone/keystone.txt
index 59d7a46f85eb..800d2d02e27b 100644
--- a/Documentation/devicetree/bindings/arm/keystone/keystone.txt
+++ b/Documentation/devicetree/bindings/arm/keystone/keystone.txt
@@ -9,12 +9,26 @@ Required properties:
    the form "ti,keystone-*". Generic devices like gic, arch_timers, ns16550
    type UART should use the specified compatible for those devices.
 
+SoC families:
+
+- Keystone 2 generic SoC:
+   compatible = "ti,keystone"
+
+SoCs:
+
+- Keystone 2 Hawking/Kepler
+   compatible = ti,k2hk", "ti,keystone"
+- Keystone 2 Lamarr
+   compatible = ti,k2l", "ti,keystone"
+- Keystone 2 Edison
+   compatible = ti,k2e", "ti,keystone"
+
 Boards:
 -  Keystone 2 Hawking/Kepler EVM
-   compatible = "ti,k2hk-evm","ti,keystone"
+   compatible = "ti,k2hk-evm", "ti,k2hk", "ti,keystone"
 
 -  Keystone 2 Lamarr EVM
-   compatible = "ti,k2l-evm","ti,keystone"
+   compatible = "ti,k2l-evm", "ti, k2l", "ti,keystone"
 
 -  Keystone 2 Edison EVM
-   compatible = "ti,k2e-evm","ti,keystone"
+   compatible = "ti,k2e-evm", "ti,k2e", "ti,keystone"
-- 
2.1.4

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[PATCH V2 2/3] ARM: keystone: Update compatible to have SoC specific matches

[Nishanth Menon]

With future SoCs of keystone2 family, the generic compatible match
may not be sufficient to handle SoC specific handling. So introduce
matches based on SoC compatiblity.

Signed-off-by: Nishanth Menon <nm@ti.com>
---
Changes in V2:
	- reformatting of commit message. no functional change

V1: https://patchwork.kernel.org/patch/7240901/

 arch/arm/mach-keystone/keystone.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/mach-keystone/keystone.c b/arch/arm/mach-keystone/keystone.c
index e288010522f9..c279293f084c 100644
--- a/arch/arm/mach-keystone/keystone.c
+++ b/arch/arm/mach-keystone/keystone.c
@@ -97,6 +97,9 @@ static long long __init keystone_pv_fixup(void)
 }
 
 static const char *const keystone_match[] __initconst = {
+	"ti,k2hk",
+	"ti,k2e",
+	"ti,k2l",
 	"ti,keystone",
 	NULL,
 };
-- 
2.1.4

[PATCH V2 3/3] ARM: dts: keystone: Update SoC specific compatible flags

[Nishanth Menon]

Update the compatible flags to allow specific SoC identification.

Signed-off-by: Nishanth Menon <nm-l0cyMroinI0@public.gmane.org>
---
V2: No change

V1: https://patchwork.kernel.org/patch/7240911/

 arch/arm/boot/dts/k2e-evm.dts   | 2 +-
 arch/arm/boot/dts/k2e.dtsi      | 3 +++
 arch/arm/boot/dts/k2hk-evm.dts  | 2 +-
 arch/arm/boot/dts/k2hk.dtsi     | 3 +++
 arch/arm/boot/dts/k2l-evm.dts   | 2 +-
 arch/arm/boot/dts/k2l.dtsi      | 3 +++
 arch/arm/boot/dts/keystone.dtsi | 1 +
 7 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/k2e-evm.dts b/arch/arm/boot/dts/k2e-evm.dts
index 50c83c21d911..b7e99807f5c2 100644
--- a/arch/arm/boot/dts/k2e-evm.dts
+++ b/arch/arm/boot/dts/k2e-evm.dts
@@ -13,7 +13,7 @@
 #include "k2e.dtsi"
 
 / {
-	compatible =  "ti,k2e-evm","ti,keystone";
+	compatible = "ti,k2e-evm", "ti,k2e", "ti,keystone";
 	model = "Texas Instruments Keystone 2 Edison EVM";
 
 	soc {
diff --git a/arch/arm/boot/dts/k2e.dtsi b/arch/arm/boot/dts/k2e.dtsi
index 675fb8e492c6..1097dada56d2 100644
--- a/arch/arm/boot/dts/k2e.dtsi
+++ b/arch/arm/boot/dts/k2e.dtsi
@@ -9,6 +9,9 @@
  */
 
 / {
+	compatible = "ti,k2e", "ti,keystone";
+	model = "Texas Instruments Keystone 2 Edison SoC";
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
diff --git a/arch/arm/boot/dts/k2hk-evm.dts b/arch/arm/boot/dts/k2hk-evm.dts
index 660ebf58d547..8161bf53271b 100644
--- a/arch/arm/boot/dts/k2hk-evm.dts
+++ b/arch/arm/boot/dts/k2hk-evm.dts
@@ -13,7 +13,7 @@
 #include "k2hk.dtsi"
 
 / {
-	compatible =  "ti,k2hk-evm","ti,keystone";
+	compatible =  "ti,k2hk-evm", "ti,k2hk", "ti,keystone";
 	model = "Texas Instruments Keystone 2 Kepler/Hawking EVM";
 
 	soc {
diff --git a/arch/arm/boot/dts/k2hk.dtsi b/arch/arm/boot/dts/k2hk.dtsi
index d0810a5f2968..ada4c7ac96e7 100644
--- a/arch/arm/boot/dts/k2hk.dtsi
+++ b/arch/arm/boot/dts/k2hk.dtsi
@@ -9,6 +9,9 @@
  */
 
 / {
+	compatible = "ti,k2hk", "ti,keystone";
+	model = "Texas Instruments Keystone 2 Kepler/Hawking SoC";
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
diff --git a/arch/arm/boot/dts/k2l-evm.dts b/arch/arm/boot/dts/k2l-evm.dts
index 9a69a6b55374..00861244d788 100644
--- a/arch/arm/boot/dts/k2l-evm.dts
+++ b/arch/arm/boot/dts/k2l-evm.dts
@@ -13,7 +13,7 @@
 #include "k2l.dtsi"
 
 / {
-	compatible =  "ti,k2l-evm","ti,keystone";
+	compatible = "ti,k2l-evm", "ti,k2l", "ti,keystone";
 	model = "Texas Instruments Keystone 2 Lamarr EVM";
 
 	soc {
diff --git a/arch/arm/boot/dts/k2l.dtsi b/arch/arm/boot/dts/k2l.dtsi
index 49fd414f680c..4446da72b0ae 100644
--- a/arch/arm/boot/dts/k2l.dtsi
+++ b/arch/arm/boot/dts/k2l.dtsi
@@ -9,6 +9,9 @@
  */
 
 / {
+	compatible = "ti,k2l", "ti,keystone";
+	model = "Texas Instruments Keystone 2 Lamarr SoC";
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
diff --git a/arch/arm/boot/dts/keystone.dtsi b/arch/arm/boot/dts/keystone.dtsi
index 72816d65f7ec..ff91f703d371 100644
--- a/arch/arm/boot/dts/keystone.dtsi
+++ b/arch/arm/boot/dts/keystone.dtsi
@@ -12,6 +12,7 @@
 #include "skeleton.dtsi"
 
 / {
+	compatible = "ti,keystone";
 	model = "Texas Instruments Keystone 2 SoC";
 	#address-cells = <2>;
 	#size-cells = <2>;
-- 
2.1.4

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Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[Nishanth Menon]

On 10/02/2015 11:09 AM, santosh shilimkar wrote:
> Nishant,
> 
> On 9/25/2015 10:38 AM, Nishanth Menon wrote:
>> On 09/25/2015 11:15 AM, santosh shilimkar wrote:
>>> 9/25/2015 9:01 AM, Nishanth Menon wrote:
> 
> [..]
> 
>>> Please refresh the series commit messages based on the
>>> discussion so far and repost. Will pick it up then.
>>>
>> Thanks. I will do so (probably early next week)..
>>
> Just want to check if you have series ready. I was planning
> to make queue ready over the weekend for upcoming merge
> window. I can hold that for another week though so let
> me know.

Apologies on the delay. Update series was send:
https://patchwork.kernel.org/patch/7322821/
https://patchwork.kernel.org/patch/7322831/
https://patchwork.kernel.org/patch/7322841/


-- 
Regards,
Nishanth Menon

Re: [PATCH V2 0/3] ARM: dts/keystone: Introduce SoC specific compatible matches

[santosh.shilimkar-QHcLZuEGTsvQT0dZR+AlfA]

On 10/3/15 4:38 PM, Nishanth Menon wrote:
> Hi,
>
> Round 2 of the series with updated patch #1. This series introduces
> SoC specific dt compatible property to allow for future SoCs to be
> handled and for userspace applications that can introduce features
> based on SoC they are functioning on.
>
> V1 of the series: http://marc.info/?l=devicetree&m=144309031109988&w=2
> V2 of the series has the following changes:
> 	- updated commit message in patch #1
> 	- picked up acked-by for patch #1
>
> Series based on v4.3-rc1
>
Queued up for 4.4. Thanks !!

Regards,
Santosh
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Re: [PATCH 1/3] Documentation: dt: keystone: provide SoC specific compatible flags

[santosh.shilimkar-QHcLZuEGTsvQT0dZR+AlfA]

On 10/3/15 4:44 PM, Nishanth Menon wrote:
> On 10/02/2015 11:09 AM, santosh shilimkar wrote:
>> Nishant,
>>
>> On 9/25/2015 10:38 AM, Nishanth Menon wrote:
>>> On 09/25/2015 11:15 AM, santosh shilimkar wrote:
>>>> 9/25/2015 9:01 AM, Nishanth Menon wrote:
>>
>> [..]
>>
>>>> Please refresh the series commit messages based on the
>>>> discussion so far and repost. Will pick it up then.
>>>>
>>> Thanks. I will do so (probably early next week)..
>>>
>> Just want to check if you have series ready. I was planning
>> to make queue ready over the weekend for upcoming merge
>> window. I can hold that for another week though so let
>> me know.
>
> Apologies on the delay. Update series was send:
> https://patchwork.kernel.org/patch/7322821/
> https://patchwork.kernel.org/patch/7322831/
> https://patchwork.kernel.org/patch/7322841/
>
No worries. Should show up in linux-next soon. I
will let it sit there along with other patches for few
more days and then send it up.

Regards,
Santosh
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