linux-kernel - [PATCH v3] arm64: dts: qcom: sc7280: only enable IPA for boards with a modem

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Date:   Fri, 23 Dec 2022 18:21:26 -0600
From:   Alex Elder <elder@...aro.org>
To:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        andersson@...nel.org, konrad.dybcio@...aro.org, agross@...nel.org
Cc:     quic_sibis@...cinc.com, mka@...omium.org, dianders@...omium.org,
        elder@...nel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3] arm64: dts: qcom: sc7280: only enable IPA for boards with a modem

IPA is only needed on a platform if it includes a modem, and not all
SC7280 SoC variants do.  The file "sc7280-herobrine-lte-sku.dtsi" is
used to encapsulate definitions related to Chrome OS SC7280 devices
where a modem is present, and that's the proper place for the IPA
node to be enabled.

Currently IPA is enabled in "sc7280-idp.dtsi", which is included by
DTS files for Qualcomm reference platforms (all of which include the
modem).  That also includes "sc7280-herobrine-lte-sku.dtsi", so
enabling IPA there would make it unnecessary for "sc7280-idp.dtsi"
to enable it.

The only other place IPA is enabled is "sc7280-qcard.dtsi".
That file is included only by "sc7280-herobrine.dtsi", which
is (eventually) included only by these top-level DTS files:
  sc7280-herobrine-crd.dts
  sc7280-herobrine-herobrine-r1.dts
  sc7280-herobrine-evoker.dts
  sc7280-herobrine-evoker-lte.dts
  sc7280-herobrine-villager-r0.dts
  sc7280-herobrine-villager-r1.dts
  sc7280-herobrine-villager-r1-lte.dts
All of but two of these include "sc7280-herobrine-lte-sku.dtsi", and
for those cases, enabling IPA there means there is no need for it to
be enabled in "sc7280-qcard.dtsi".

The two remaining cases will no longer enable IPA as a result of
this change:
  sc7280-herobrine-evoker.dts
  sc7280-herobrine-villager-r1.dts
Both of these have "lte" counterparts, and are meant to represent
board variants that do *not* have a modem.

This is exactly the desired configuration.

Signed-off-by: Alex Elder <elder@...aro.org>
Reviewed-by: Sibi Sankar <quic_sibis@...cinc.com>
Tested-by: Sibi Sankar <quic_sibis@...cinc.com>
Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
---
v3:  Rewrote the subject line as suggested by Matthias
v2:  Moved &ipa node update earlier, and status property to end

 arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi | 5 +++++
 arch/arm64/boot/dts/qcom/sc7280-idp.dtsi               | 5 -----
 arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi             | 5 -----
 3 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi b/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
index ad66e5e9db4ed..c5309b25d0860 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280-herobrine-lte-sku.dtsi
@@ -20,6 +20,11 @@ mba_mem: memory@...00000 {
 	};
 };

+&ipa {
+	modem-init;
+	status = "okay";
+};
+
 &remoteproc_mpss {
 	compatible = "qcom,sc7280-mss-pil";
 	iommus = <&apps_smmu 0x124 0x0>, <&apps_smmu 0x488 0x7>;
diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
index f7efb9966afd1..0ddbe7f732bd9 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dtsi
@@ -376,11 +376,6 @@ &gpi_dma1 {
 	status = "okay";
 };

-&ipa {
-	status = "okay";
-	modem-init;
-};
-
 &lpass_cpu {
 	status = "okay";

diff --git a/arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi b/arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi
index df49564ae6dc1..cd6ee84b36fd4 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7280-qcard.dtsi
@@ -336,11 +336,6 @@ vreg_bob: bob {

 /* ADDITIONS TO NODES DEFINED IN PARENT DEVICE TREE FILES */

-&ipa {
-	status = "okay";
-	modem-init;
-};
-
 &lpass_va_macro {
 	vdd-micb-supply = <&vreg_bob>;
 };
-- 
2.34.1