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Commit a686b527 authored by Can Guo's avatar Can Guo
Browse files

phy: qcom-ufs: make ref_clk as optional 



Per newer UFS PHY design, some platforms may not have the ON/OFF control
for reference clock, hence this clock may be optional.

Change-Id: I26edd35970e88a8d17edded399b63c5d3cc7f5d9
Signed-off-by: default avatarCan Guo <cang@codeaurora.org>
parent 427b10e6

drivers/phy/qualcomm/phy-qcom-ufs.c

+25 −10
Original line number Diff line number Diff line
@@ -219,10 +219,12 @@ int ufs_qcom_phy_init_clks(struct ufs_qcom_phy *phy_common) 
	__ufs_qcom_phy_clk_get(phy_common->dev, "ref_clk_parent",

				   &phy_common->ref_clk_parent, false);



	err = ufs_qcom_phy_clk_get(phy_common->dev, "ref_clk",

				   &phy_common->ref_clk);

	if (err)

		goto out;

	/*

	 * Some platforms may not have the ON/OFF control for reference clock,

	 * hence this clock may be optional.

	 */

	__ufs_qcom_phy_clk_get(phy_common->dev, "ref_clk",

				   &phy_common->ref_clk, false);



	/*

	 * "ref_aux_clk" is optional and only supported by certain
@@ -408,12 +410,18 @@ static int ufs_qcom_phy_enable_ref_clk(struct ufs_qcom_phy *phy) 
		}

	}



	/*

	 * "ref_clk" is optional clock hence make sure that clk reference

	 * is available before trying to enable the clock.

	 */

	if (phy->ref_clk) {

		ret = clk_prepare_enable(phy->ref_clk);

		if (ret) {

			dev_err(phy->dev, "%s: ref_clk enable failed %d\n",

					__func__, ret);

			goto out_disable_parent;

		}

	}



	/*

	 * "ref_aux_clk" is optional clock and only supported by certain
@@ -476,7 +484,14 @@ static void ufs_qcom_phy_disable_ref_clk(struct ufs_qcom_phy *phy) 
		 */

		if (phy->ref_aux_clk)

			clk_disable_unprepare(phy->ref_aux_clk);



		/*

		 * "ref_clk" is optional clock hence make sure that clk

		 * reference is available before trying to disable the clock.

		 */

		if (phy->ref_clk)

			clk_disable_unprepare(phy->ref_clk);



		/*

		 * "ref_clk_parent" is optional clock hence make sure that clk

		 * reference is available before trying to disable the clock.