openwrt/target/linux/sunxi/patches-3.13/170-8-clk-sunxi-implement-mmc-phasectrl.patch

From fcba369ee1af8657353bb1e37807aa492c462263 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emilio=20L=C3=B3pez?= <emilio@elopez.com.ar>
Date: Fri, 20 Sep 2013 20:29:17 -0300
Subject: [PATCH] clk: sunxi: Implement MMC phase control
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Signed-off-by: Emilio López <emilio@elopez.com.ar>
---
 drivers/clk/sunxi/clk-sunxi.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index 3283179..46a38b4 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -500,6 +500,41 @@ static void __init sun7i_a20_gmac_clk_setup(struct device_node *node)
 
 
 /**
+ * clk_sunxi_mmc_phase_control() - configures MMC clock phase control
+ */
+
+void clk_sunxi_mmc_phase_control(struct clk_hw *hw, u8 sample, u8 output)
+{
+	#define to_clk_composite(_hw) container_of(_hw, struct clk_composite, hw)
+	#define to_clk_factors(_hw) container_of(_hw, struct clk_factors, hw)
+
+	struct clk_composite *composite = to_clk_composite(hw);
+	struct clk_hw *rate_hw = composite->rate_hw;
+	struct clk_factors *factors = to_clk_factors(rate_hw);
+	unsigned long flags = 0;
+	u32 reg;
+
+	if (factors->lock)
+		spin_lock_irqsave(factors->lock, flags);
+
+	reg = readl(factors->reg);
+
+	/* set sample clock phase control */
+	reg &= ~(0x7 << 20);
+	reg |= ((sample & 0x7) << 20);
+
+	/* set output clock phase control */
+	reg &= ~(0x7 << 8);
+	reg |= ((output & 0x7) << 8);
+
+	writel(reg, factors->reg);
+
+	if (factors->lock)
+		spin_unlock_irqrestore(factors->lock, flags);
+}
+
+
+/**
  * sunxi_factors_clk_setup() - Setup function for factor clocks
  */
 
-- 
1.8.5.5