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phy: ufs-qcom: add optional ref aux clk

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phy-ufs-qcom-qmp-v3 needs an additional ref aux clk to be enabled,
add support for the new ref aux clk and make it optional as its not
needed by other phy versions.

Change-Id: I5e04980eb451b193e9c024bfe35383d10d17feff
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
This commit is contained in:
Venkat Gopalakrishnan 2016-04-20 13:18:37 -07:00 • committed by Jeevan Shriram
parent 2bb44fdeb8
commit 32ae49b565
2 changed files with 33 additions and 0 deletions
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1
drivers/phy/phy-qcom-ufs-i.h
View file

@ -91,6 +91,7 @@ struct ufs_qcom_phy {
struct clk *ref_clk_src;
struct clk *ref_clk_parent;
struct clk *ref_clk;
struct clk *ref_aux_clk;
bool is_ref_clk_enabled;
bool is_dev_ref_clk_enabled;
struct ufs_qcom_phy_vreg vdda_pll;

32
drivers/phy/phy-qcom-ufs.c
View file

@ -220,7 +220,15 @@ ufs_qcom_phy_init_clks(struct phy *generic_phy,
err = ufs_qcom_phy_clk_get(generic_phy, "ref_clk",
&phy_common->ref_clk);
if (err)
goto out;
/*
* "ref_aux_clk" is optional and only supported by certain
* phy versions, don't abort init if it's not found.
*/
__ufs_qcom_phy_clk_get(generic_phy, "ref_aux_clk",
&phy_common->ref_aux_clk, false);
out:
return err;
}
@ -434,9 +442,26 @@ int ufs_qcom_phy_enable_ref_clk(struct phy *generic_phy)
goto out_disable_parent;
}
/*
* "ref_aux_clk" is optional clock and only supported by certain
* phy versions, hence make sure that clk reference is available
* before trying to enable the clock.
*/
if (phy->ref_aux_clk) {
ret = clk_prepare_enable(phy->ref_aux_clk);
if (ret) {
dev_err(phy->dev, "%s: ref_aux_clk enable failed %d\n",
__func__, ret);
goto out_disable_ref;
}
}
phy->is_ref_clk_enabled = true;
goto out;
out_disable_ref:
if (phy->ref_clk)
clk_disable_unprepare(phy->ref_clk);
out_disable_parent:
if (phy->ref_clk_parent)
clk_disable_unprepare(phy->ref_clk_parent);
@ -477,6 +502,13 @@ void ufs_qcom_phy_disable_ref_clk(struct phy *generic_phy)
struct ufs_qcom_phy *phy = get_ufs_qcom_phy(generic_phy);
if (phy->is_ref_clk_enabled) {
/*
* "ref_aux_clk" is optional clock and only supported by
* certain phy versions, hence make sure that clk reference
* is available before trying to disable the clock.
*/
if (phy->ref_aux_clk)
clk_disable_unprepare(phy->ref_aux_clk);
clk_disable_unprepare(phy->ref_clk);
/*
* "ref_clk_parent" is optional clock hence make sure that clk