linux-kernel - [PATCH 4/6] clk: qcom: Add support for PLLs with alpha mode

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Message-Id: <1468234239-28693-5-git-send-email-rnayak@codeaurora.org>
Date:	Mon, 11 Jul 2016 16:20:37 +0530
From:	Rajendra Nayak <rnayak@...eaurora.org>
To:	sboyd@...eaurora.org, stephen.boyd@...aro.org,
	mturquette@...libre.com
Cc:	linux-clk@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Rajendra Nayak <rnayak@...eaurora.org>
Subject: [PATCH 4/6] clk: qcom: Add support for PLLs with alpha mode

Some PLLs can support an alpha mode, and a single alpha
register (instead of registers to program the M/N values),
the contents of which depend on the alpha mode selected.
(They are either treated as two's complement or M/N value)
Add support for this in the clk PLL driver.

Signed-off-by: Rajendra Nayak <rnayak@...eaurora.org>
---
 drivers/clk/qcom/clk-pll.c | 8 ++++++--
 drivers/clk/qcom/clk-pll.h | 2 ++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/qcom/clk-pll.c b/drivers/clk/qcom/clk-pll.c
index 5b940d6..08d2fa2 100644
--- a/drivers/clk/qcom/clk-pll.c
+++ b/drivers/clk/qcom/clk-pll.c
@@ -255,8 +255,12 @@ static void clk_pll_configure(struct clk_pll *pll, struct regmap *regmap,
 	u32 mask;
 
 	regmap_write(regmap, pll->l_reg, config->l);
-	regmap_write(regmap, pll->m_reg, config->m);
-	regmap_write(regmap, pll->n_reg, config->n);
+	if (pll->alpha_reg) {
+		regmap_write(regmap, pll->alpha_reg, config->alpha);
+	} else {
+		regmap_write(regmap, pll->m_reg, config->m);
+		regmap_write(regmap, pll->n_reg, config->n);
+	}
 
 	val = config->vco_val;
 	val |= config->pre_div_val;
diff --git a/drivers/clk/qcom/clk-pll.h b/drivers/clk/qcom/clk-pll.h
index ffd0c63..083727e 100644
--- a/drivers/clk/qcom/clk-pll.h
+++ b/drivers/clk/qcom/clk-pll.h
@@ -48,6 +48,7 @@ struct clk_pll {
 	u32	l_reg;
 	u32	m_reg;
 	u32	n_reg;
+	u32	alpha_reg;
 	u32	config_reg;
 	u32	mode_reg;
 	u32	status_reg;
@@ -70,6 +71,7 @@ struct pll_config {
 	u16 l;
 	u32 m;
 	u32 n;
+	u32 alpha;
 	u32 vco_val;
 	u32 vco_mask;
 	u32 pre_div_val;
-- 
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