linux-kernel - [PATCH 2/2] arm64: dts: msm8916-samsung-a5u: Override iris compatible

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Date:   Thu, 22 Aug 2019 13:23:39 +0200
From:   Stephan Gerhold <stephan@...hold.net>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Stephan Gerhold <stephan@...hold.net>
Subject: [PATCH 2/2] arm64: dts: msm8916-samsung-a5u: Override iris compatible

msm8916.dtsi sets the iris compatible to "qcom,wcn3620".
While WCN3620 seems to be used on most MSM8916 devices,
MSM8916 can also be paired with another chip (e.g. for WiFi dual-band).

A5U uses WCN3660B instead, so the compatible needs to be overridden
to apply the correct configuration.

However, simply using "qcom,wcn3660" would be incorrect,
since WCN3660B requires a slightly different regulator configuration
compared to WCN3660.

Instead, it requires the same configuration as "qcom,wcn3680".
Replace the compatible with "qcom,wcn3680" for A5U to make WCNSS
work correctly.

Signed-off-by: Stephan Gerhold <stephan@...hold.net>
---
I'm not quite sure if it would be better to define a new compatible
for WCN3660B (e.g. "qcom,wcn3660b") since this isn't really a WCN3680.
But in any case, it would use exactly the same configuration.

The compatible seems to be only used for regulator + clock configuration,
see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/remoteproc/qcom_wcnss_iris.c#n57

 arch/arm64/boot/dts/qcom/msm8916-samsung-a5u-eur.dts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/msm8916-samsung-a5u-eur.dts b/arch/arm64/boot/dts/qcom/msm8916-samsung-a5u-eur.dts
index 1aa59da98495..6629a621139c 100644
--- a/arch/arm64/boot/dts/qcom/msm8916-samsung-a5u-eur.dts
+++ b/arch/arm64/boot/dts/qcom/msm8916-samsung-a5u-eur.dts
@@ -8,3 +8,9 @@
 	model = "Samsung Galaxy A5U (EUR)";
 	compatible = "samsung,a5u-eur", "qcom,msm8916";
 };
+
+&pronto {
+	iris {
+		compatible = "qcom,wcn3680";
+	};
+};
-- 
2.22.1