linux-kernel - [PATCH v4 3/6] clk: sunxi: Support factor clocks with N factor starting not from 0

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Message-Id: <1403798144-32188-4-git-send-email-wens@csie.org>
Date:	Thu, 26 Jun 2014 23:55:41 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Mike Turquette <mturquette@...aro.org>,
	Emilio Lopez <emilio@...pez.com.ar>
Cc:	Chen-Yu Tsai <wens@...e.org>, linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-sunxi@...glegroups.com
Subject: [PATCH v4 3/6] clk: sunxi: Support factor clocks with N factor starting not from 0

The PLLs on newer Allwinner SoC's, such as the A31 and A23, have a
N multiplier factor that starts from 1, not 0.

This patch adds an option to the factor clk driver's config data
structures to specify the base value of N.

Signed-off-by: Chen-Yu Tsai <wens@...e.org>
Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
---
 drivers/clk/sunxi/clk-factors.c | 2 +-
 drivers/clk/sunxi/clk-factors.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/sunxi/clk-factors.c b/drivers/clk/sunxi/clk-factors.c
index 3806d97..2057c8a 100644
--- a/drivers/clk/sunxi/clk-factors.c
+++ b/drivers/clk/sunxi/clk-factors.c
@@ -62,7 +62,7 @@ static unsigned long clk_factors_recalc_rate(struct clk_hw *hw,
 		p = FACTOR_GET(config->pshift, config->pwidth, reg);
 
 	/* Calculate the rate */
-	rate = (parent_rate * n * (k + 1) >> p) / (m + 1);
+	rate = (parent_rate * (n + config->n_start) * (k + 1) >> p) / (m + 1);
 
 	return rate;
 }
diff --git a/drivers/clk/sunxi/clk-factors.h b/drivers/clk/sunxi/clk-factors.h
index 02e1a43..d2d0efa 100644
--- a/drivers/clk/sunxi/clk-factors.h
+++ b/drivers/clk/sunxi/clk-factors.h
@@ -15,6 +15,7 @@ struct clk_factors_config {
 	u8 mwidth;
 	u8 pshift;
 	u8 pwidth;
+	u8 n_start;
 };
 
 struct clk_factors {
-- 
2.0.0

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