linux-kernel - Re: [PATCH] clk: qcom: sc8280xp: add parent to gcc_ufs_phy_axi

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Date:   Tue, 19 Jul 2022 14:49:52 -0400
From:   Brian Masney <bmasney@...hat.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, agross@...nel.org,
        mturquette@...libre.com, sboyd@...nel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        ahalaney@...hat.com, echanude@...hat.com
Subject: Re: [PATCH] clk: qcom: sc8280xp: add parent to gcc_ufs_phy_axi_clk
 for sa8540p

On Sat, Jul 16, 2022 at 09:54:43AM -0500, Bjorn Andersson wrote:
> gcc_ufs_ref_clkref_clk isn't the parent of gcc_ufs_phy_axi_clk.
> 
> But I presume that if this works, then you're just enabling the ufs
> clkref clock, indirectly. Seems reasonable that you should be specifying
> gcc_ufs_ref_clkref_clk as "ref_clk" instead.
> 
> Could you please give that a go?

Hey Bjorn,

I assume you mean ref_aux on the phy with this patch:

--- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
@@ -1464,7 +1464,7 @@ ufs_mem_phy: phy@...7000 {
                        clock-names = "ref",
                                      "ref_aux";
                        clocks = <&rpmhcc RPMH_CXO_CLK>,
-                                <&gcc GCC_UFS_PHY_PHY_AUX_CLK>;
+                                <&gcc GCC_UFS_REF_CLKREF_CLK>;
 
                        resets = <&ufs_mem_hc 0>;
                        reset-names = "ufsphy";

This works on the sa8540p.

I tried changing ref_clk on the ufs host controller from
<&rpmhcc RPMH_CXO_CLK> to the new value and the board resets.

Brian