linux-kernel - [PATCH v4 1/6] clk: sunxi-ng: div: Add support for fixed post-divider

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Message-Id: <bc043a64775ec8c9cfcfe6d638e348d38e34eba3.1498422562.git-series.plaes@plaes.org>
Date:   Sun, 25 Jun 2017 23:45:42 +0300
From:   Priit Laes <plaes@...es.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Russell King <linux@...linux.org.uk>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     linux-sunxi@...glegroups.com, Jonathan Liu <net147@...il.com>,
        Priit Laes <plaes@...es.org>
Subject: [PATCH v4 1/6] clk: sunxi-ng: div: Add support for fixed post-divider

SATA clock on sun4i/sun7i is of type (parent) / M / 6 where
6 is fixed post-divider.

Signed-off-by: Priit Laes <plaes@...es.org>
---
 drivers/clk/sunxi-ng/ccu_div.c | 12 ++++++++++--
 drivers/clk/sunxi-ng/ccu_div.h |  3 ++-
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/sunxi-ng/ccu_div.c b/drivers/clk/sunxi-ng/ccu_div.c
index c0e5c10..de30e15 100644
--- a/drivers/clk/sunxi-ng/ccu_div.c
+++ b/drivers/clk/sunxi-ng/ccu_div.c
@@ -62,8 +62,13 @@ static unsigned long ccu_div_recalc_rate(struct clk_hw *hw,
 	parent_rate = ccu_mux_helper_apply_prediv(&cd->common, &cd->mux, -1,
 						  parent_rate);
 
-	return divider_recalc_rate(hw, parent_rate, val, cd->div.table,
-				   cd->div.flags);
+	val = divider_recalc_rate(hw, parent_rate, val, cd->div.table,
+				  cd->div.flags);
+
+	if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
+		val /= cd->fixed_post_div;
+
+	return val;
 }
 
 static int ccu_div_determine_rate(struct clk_hw *hw,
@@ -89,6 +94,9 @@ static int ccu_div_set_rate(struct clk_hw *hw, unsigned long rate,
 	val = divider_get_val(rate, parent_rate, cd->div.table, cd->div.width,
 			      cd->div.flags);
 
+	if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
+		val *= cd->fixed_post_div;
+
 	spin_lock_irqsave(cd->common.lock, flags);
 
 	reg = readl(cd->common.base + cd->common.reg);
diff --git a/drivers/clk/sunxi-ng/ccu_div.h b/drivers/clk/sunxi-ng/ccu_div.h
index 08d0744..f3a5028 100644
--- a/drivers/clk/sunxi-ng/ccu_div.h
+++ b/drivers/clk/sunxi-ng/ccu_div.h
@@ -86,9 +86,10 @@ struct ccu_div_internal {
 struct ccu_div {
 	u32			enable;
 
-	struct ccu_div_internal		div;
+	struct ccu_div_internal	div;
 	struct ccu_mux_internal	mux;
 	struct ccu_common	common;
+	unsigned int		fixed_post_div;
 };
 
 #define SUNXI_CCU_DIV_TABLE_WITH_GATE(_struct, _name, _parent, _reg,	\
-- 
git-series 0.9.1