linux-kernel - [PATCH 01/16] clk: permit to define a custom parent for clk_hw_get_parent

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Date:   Sun, 13 Mar 2022 20:04:04 +0100
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Ansuel Smith <ansuelsmth@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: [PATCH 01/16] clk: permit to define a custom parent for clk_hw_get_parent_index

Clk can have multiple parents. Some clk may require to get the cached
index of other parent that are not current associated with the clk.
Extend clk_hw_get_parent_index() with an optional parent to permit a
driver to get the cached index. If parent is NULL, the parent associated
with the provided hw clk is used.

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 drivers/clk/clk.c                 | 14 +++++++++-----
 drivers/clk/tegra/clk-periph.c    |  2 +-
 drivers/clk/tegra/clk-sdmmc-mux.c |  2 +-
 drivers/clk/tegra/clk-super.c     |  4 ++--
 include/linux/clk-provider.h      |  2 +-
 5 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 8de6a22498e7..fe42f56bfbdf 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1711,15 +1711,19 @@ static int clk_fetch_parent_index(struct clk_core *core,
 /**
  * clk_hw_get_parent_index - return the index of the parent clock
  * @hw: clk_hw associated with the clk being consumed
+ * @parent: optional clk_hw of the parent to be fetched
  *
- * Fetches and returns the index of parent clock. Returns -EINVAL if the given
- * clock does not have a current parent.
+ * Fetches and returns the index of parent clock. If parent is not
+ * provided the parent of hw is used.
+ * Returns -EINVAL if the given clock does not have a current parent.
  */
-int clk_hw_get_parent_index(struct clk_hw *hw)
+int clk_hw_get_parent_index(struct clk_hw *hw, struct clk_hw *parent)
 {
-	struct clk_hw *parent = clk_hw_get_parent(hw);
+	/* With parent NULL get the current parent of hw */
+	if (!parent)
+		parent = clk_hw_get_parent(hw);
 
-	if (WARN_ON(parent == NULL))
+	if (WARN_ON(!parent))
 		return -EINVAL;
 
 	return clk_fetch_parent_index(hw->core, parent->core);
diff --git a/drivers/clk/tegra/clk-periph.c b/drivers/clk/tegra/clk-periph.c
index 79ca3aa072b7..0fecdbbaca8f 100644
--- a/drivers/clk/tegra/clk-periph.c
+++ b/drivers/clk/tegra/clk-periph.c
@@ -116,7 +116,7 @@ static void clk_periph_restore_context(struct clk_hw *hw)
 	struct clk_hw *div_hw = &periph->divider.hw;
 	int parent_id;
 
-	parent_id = clk_hw_get_parent_index(hw);
+	parent_id = clk_hw_get_parent_index(hw, NULL);
 	if (WARN_ON(parent_id < 0))
 		return;
 
diff --git a/drivers/clk/tegra/clk-sdmmc-mux.c b/drivers/clk/tegra/clk-sdmmc-mux.c
index 4f2c3309eea4..6013ca8444f4 100644
--- a/drivers/clk/tegra/clk-sdmmc-mux.c
+++ b/drivers/clk/tegra/clk-sdmmc-mux.c
@@ -210,7 +210,7 @@ static void clk_sdmmc_mux_restore_context(struct clk_hw *hw)
 	unsigned long rate = clk_hw_get_rate(hw);
 	int parent_id;
 
-	parent_id = clk_hw_get_parent_index(hw);
+	parent_id = clk_hw_get_parent_index(hw, NULL);
 	if (WARN_ON(parent_id < 0))
 		return;
 
diff --git a/drivers/clk/tegra/clk-super.c b/drivers/clk/tegra/clk-super.c
index a98a420398fa..27cbbc09ef68 100644
--- a/drivers/clk/tegra/clk-super.c
+++ b/drivers/clk/tegra/clk-super.c
@@ -128,7 +128,7 @@ static void clk_super_mux_restore_context(struct clk_hw *hw)
 {
 	int parent_id;
 
-	parent_id = clk_hw_get_parent_index(hw);
+	parent_id = clk_hw_get_parent_index(hw, NULL);
 	if (WARN_ON(parent_id < 0))
 		return;
 
@@ -180,7 +180,7 @@ static void clk_super_restore_context(struct clk_hw *hw)
 	struct clk_hw *div_hw = &super->frac_div.hw;
 	int parent_id;
 
-	parent_id = clk_hw_get_parent_index(hw);
+	parent_id = clk_hw_get_parent_index(hw, NULL);
 	if (WARN_ON(parent_id < 0))
 		return;
 
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 2faa6f7aa8a8..65b2850c09be 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -1198,7 +1198,7 @@ unsigned int clk_hw_get_num_parents(const struct clk_hw *hw);
 struct clk_hw *clk_hw_get_parent(const struct clk_hw *hw);
 struct clk_hw *clk_hw_get_parent_by_index(const struct clk_hw *hw,
 					  unsigned int index);
-int clk_hw_get_parent_index(struct clk_hw *hw);
+int clk_hw_get_parent_index(struct clk_hw *hw, struct clk_hw *parent);
 int clk_hw_set_parent(struct clk_hw *hw, struct clk_hw *new_parent);
 unsigned int __clk_get_enable_count(struct clk *clk);
 unsigned long clk_hw_get_rate(const struct clk_hw *hw);
-- 
2.34.1