On 2018-02-01 02:48, Mark Rutland wrote:
On Thu, Jan 25, 2018 at 03:55:12PM -0800, Channagoud Kadabi wrote:
Documentation for last level cache controller device tree bindings,
client bindings usage examples.
Signed-off-by: Channagoud Kadabi <ckadabi@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/arm/msm/qcom,llcc.txt | 93
++++++++++++++++++++++
1 file changed, 93 insertions(+)
create mode 100644
Documentation/devicetree/bindings/arm/msm/qcom,llcc.txt
+Example:
+
+ qcom,system-cache@1300000 {
+ compatible = "qcom,llcc-core", "syscon", "simple-mfd";
+ reg = <0x1300000 0x50000>;
+ reg-names = "llcc_base";
+
+ llcc: qcom,sdm845-llcc {
+ compatible = "qcom,sdm845-llcc";
+ #cache-cells = <1>;
+ max-slices = <32>;
+ };
+
+ qcom,llcc-ecc {
+ compatible = "qcom,llcc-ecc";
+ };
+
+ qcom,llcc-amon {
+ compatible = "qcom,llcc-amon";
+ qcom,fg-cnt = <0x7>;
+ };
+
+ };
The "qcom,llcc-ecc" and "qcom,llcc-amon" bindings doesn't seem to be
used by the driver in patch 2, and it's not clear how they are intended
to be used, so I think they should go from the binding for now.
Sure I can remove them for now and add them when the I push other
drivers
for review.
I don't think you need syscon and simple-mfd, and I think you can
I used syscon and simple-mfd because three drivers touch the same
address space.
Driver 1:
system cache core: The purpose of the driver is to partition the system
cache
and program the settings such as priority, lines to probe while doing a
look up
in the system cache, low power related settings etc.
The driver also provides API for clients to query the cache slice
details,
activate and deactivate them.
Driver 2:
ECC to detect single and double bit errors in LLCC memory.
Implemented using EDAC framework.
Driver 3:
AMON: Activity Monitor to detect live lock ups in the HW block.
Implemented as SOC driver similar to driver #1.
Since the hardware block has multiple functional units the driver is
implemented
to use syscon/regmap interface.
simplify the binding to a single node like:
qcom,system-cache@1300000 {
compatible = "qcom,sdm845-llcc";
reg = <0x1300000 0x50000>;
#cache-slice-cells = <1>;
max-slices = <32>;
}
If ECC and AMON are option features, we can always add boolean
properties for those later, e.g. "has-ecc".
Thanks,
Mark.
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