linux-kernel - [PATCH 1/2] clk: sunxi: add predivider handling for factors clock

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Date:	Sun, 17 Apr 2016 02:55:05 +0800
From:	Vishnu Patekar <vishnupatekar0510@...il.com>
To:	maxime.ripard@...e-electrons.com, emilio@...pez.com.ar,
	wens@...e.org
Cc:	sboyd@...eaurora.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: [PATCH 1/2] clk: sunxi: add predivider handling for factors clock

For A31 ahb1 and a83t ahb1 clocks have predivider for certain parent.
To handle this, this patch adds predivider table with parent index,
prediv shift and width, parents with predivider will have nonzero width.

Rate adjustment is moved from clock specific recalc function to generic
factors recalc.

Signed-off-by: Vishnu Patekar <vishnupatekar0510@...il.com>
---
 drivers/clk/sunxi/clk-factors.c | 31 +++++++++++++++----------------
 drivers/clk/sunxi/clk-factors.h | 10 +++++++++-
 2 files changed, 24 insertions(+), 17 deletions(-)

diff --git a/drivers/clk/sunxi/clk-factors.c b/drivers/clk/sunxi/clk-factors.c
index ddefe96..8f3b637 100644
--- a/drivers/clk/sunxi/clk-factors.c
+++ b/drivers/clk/sunxi/clk-factors.c
@@ -45,10 +45,12 @@ static unsigned long clk_factors_recalc_rate(struct clk_hw *hw,
 					     unsigned long parent_rate)
 {
 	u8 n = 1, k = 0, p = 0, m = 0;
+	u8 par_index = 0;
 	u32 reg;
 	unsigned long rate;
 	struct clk_factors *factors = to_clk_factors(hw);
 	const struct clk_factors_config *config = factors->config;
+	const struct clk_factors_prediv *prediv = factors->prediv_config;
 
 	/* Fetch the register value */
 	reg = readl(factors->reg);
@@ -63,24 +65,16 @@ static unsigned long clk_factors_recalc_rate(struct clk_hw *hw,
 	if (config->pwidth != SUNXI_FACTORS_NOT_APPLICABLE)
 		p = FACTOR_GET(config->pshift, config->pwidth, reg);
 
-	if (factors->recalc) {
-		struct factors_request factors_req = {
-			.parent_rate = parent_rate,
-			.n = n,
-			.k = k,
-			.m = m,
-			.p = p,
-		};
-
+	if (prediv) {
 		/* get mux details from mux clk structure */
 		if (factors->mux)
-			factors_req.parent_index =
-				(reg >> factors->mux->shift) &
-				factors->mux->mask;
-
-		factors->recalc(&factors_req);
+			par_index = (reg >> factors->mux->shift) &
+					factors->mux->mask;
 
-		return factors_req.rate;
+		if (prediv[par_index].width != SUNXI_FACTORS_NOT_APPLICABLE) {
+			m = FACTOR_GET(prediv[par_index].shift,
+				prediv[par_index].width, reg);
+		}
 	}
 
 	/* Calculate the rate */
@@ -102,8 +96,12 @@ static int clk_factors_determine_rate(struct clk_hw *hw,
 	for (i = 0; i < num_parents; i++) {
 		struct factors_request factors_req = {
 			.rate = req->rate,
-			.parent_index = i,
 		};
+
+		if (factors->prediv_config)
+			factors_req.prediv_width =
+						factors->prediv_config[i].width;
+
 		parent = clk_hw_get_parent_by_index(hw, i);
 		if (!parent)
 			continue;
@@ -211,6 +209,7 @@ struct clk *sunxi_factors_register(struct device_node *node,
 	/* set up factors properties */
 	factors->reg = reg;
 	factors->config = data->table;
+	factors->prediv_config = data->prediv_table;
 	factors->get_factors = data->getter;
 	factors->recalc = data->recalc;
 	factors->lock = lock;
diff --git a/drivers/clk/sunxi/clk-factors.h b/drivers/clk/sunxi/clk-factors.h
index 1e63c5b..b1b7745 100644
--- a/drivers/clk/sunxi/clk-factors.h
+++ b/drivers/clk/sunxi/clk-factors.h
@@ -18,10 +18,16 @@ struct clk_factors_config {
 	u8 n_start;
 };
 
+struct clk_factors_prediv {
+	u8 parent_index;
+	u8 shift;
+	u8 width;
+};
+
 struct factors_request {
 	unsigned long rate;
 	unsigned long parent_rate;
-	u8 parent_index;
+	u8 prediv_width;
 	u8 n;
 	u8 k;
 	u8 m;
@@ -33,6 +39,7 @@ struct factors_data {
 	int mux;
 	int muxmask;
 	const struct clk_factors_config *table;
+	const struct clk_factors_prediv *prediv_table;
 	void (*getter)(struct factors_request *req);
 	void (*recalc)(struct factors_request *req);
 	const char *name;
@@ -42,6 +49,7 @@ struct clk_factors {
 	struct clk_hw hw;
 	void __iomem *reg;
 	const struct clk_factors_config *config;
+	const struct clk_factors_prediv *prediv_config;
 	void (*get_factors)(struct factors_request *req);
 	void (*recalc)(struct factors_request *req);
 	spinlock_t *lock;
-- 
1.9.1