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From:   Johan Hovold <johan+linaro@kernel.org>
To:     Bjorn Andersson <andersson@kernel.org>
Cc:     Andy Gross <agross@kernel.org>,
        Konrad Dybcio <konrad.dybcio@somainline.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Brian Masney <bmasney@redhat.com>,
        linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Johan Hovold <johan+linaro@kernel.org>
Subject: [PATCH] arm64: dts: qcom: sc8280xp: fix ufs_card_phy ref clock
Date:   Wed,  5 Oct 2022 16:33:05 +0200
Message-Id: <20221005143305.388-1-johan+linaro@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

The GCC_UFS_REF_CLKREF_CLK must be enabled or the second UFS controller
fails to enumerate on sa8295p-adp.

Note that the vendor kernel enables both GCC_UFS_REF_CLKREF_CLK and
GCC_UFS_1_CARD_CLKREF_CLK and it is possible that the former should be
modelled as a parent of the latter. The clock driver also has a
GCC_UFS_CARD_CLKREF_CLK clock which the firmware appears to enable on
the ADP.

The usual lack of documentation for Qualcomm SoCs makes this a highly
annoying guessing game, but as the second controller works on the ADP
without either card reference clock enabled, only enable
GCC_UFS_REF_CLKREF_CLK for now.

Fixes: 152d1faf1e2f ("arm64: dts: qcom: add SC8280XP platform")
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---

The related issue for the first controller is being fixed here:

	https://lore.kernel.org/lkml/20220830180120.2082734-1-bmasney@redhat.com/T/#u

Johan


 arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
index cf7ef37c11ec..917f1feac6ac 100644
--- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
@@ -960,7 +960,7 @@ ufs_card_phy: phy@1da7000 {
 			ranges;
 			clock-names = "ref",
 				      "ref_aux";
-			clocks = <&gcc GCC_UFS_1_CARD_CLKREF_CLK>,
+			clocks = <&gcc GCC_UFS_REF_CLKREF_CLK>,
 				 <&gcc GCC_UFS_CARD_PHY_AUX_CLK>;
 
 			resets = <&ufs_card_hc 0>;
-- 
2.35.1