linux-kernel - [PATCH v9 03/14] clk: tegra: Add TEGRA_PLL

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Date:	Wed, 3 Apr 2013 17:40:37 +0300
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Peter De Schrijver <pdeschrijver@...dia.com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Stephen Warren <swarren@...dotorg.org>,
	Russell King <linux@....linux.org.uk>,
	Prashant Gaikwad <pgaikwad@...dia.com>,
	Simon Glass <sjg@...omium.org>,
	Rhyland Klein <rklein@...dia.com>,
	Pritesh Raithatha <praithatha@...dia.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Hiroshi Doyu <hdoyu@...dia.com>,
	Laxman Dewangan <ldewangan@...dia.com>,
	Andrew Chew <achew@...dia.com>,
	Mike Turquette <mturquette@...aro.org>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v9 03/14] clk: tegra: Add TEGRA_PLL_BYPASS flag

Not all PLLs in Tegra114 have a bypass bit. Adapt the common code to only use
this bit when available.

Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
---
 drivers/clk/tegra/clk-pll.c |   12 ++++++++----
 drivers/clk/tegra/clk.h     |    2 ++
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/tegra/clk-pll.c b/drivers/clk/tegra/clk-pll.c
index 3feefb1..4ee6d03 100644
--- a/drivers/clk/tegra/clk-pll.c
+++ b/drivers/clk/tegra/clk-pll.c
@@ -171,7 +171,8 @@ static void _clk_pll_enable(struct clk_hw *hw)
 	clk_pll_enable_lock(pll);
 
 	val = pll_readl_base(pll);
-	val &= ~PLL_BASE_BYPASS;
+	if (pll->flags & TEGRA_PLL_BYPASS)
+		val &= ~PLL_BASE_BYPASS;
 	val |= PLL_BASE_ENABLE;
 	pll_writel_base(val, pll);
 
@@ -188,7 +189,9 @@ static void _clk_pll_disable(struct clk_hw *hw)
 	u32 val;
 
 	val = pll_readl_base(pll);
-	val &= ~(PLL_BASE_BYPASS | PLL_BASE_ENABLE);
+	if (pll->flags & TEGRA_PLL_BYPASS)
+		val &= ~PLL_BASE_BYPASS;
+	val &= ~PLL_BASE_ENABLE;
 	pll_writel_base(val, pll);
 
 	if (pll->flags & TEGRA_PLLM) {
@@ -459,7 +462,7 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hw,
 
 	val = pll_readl_base(pll);
 
-	if (val & PLL_BASE_BYPASS)
+	if ((pll->flags & TEGRA_PLL_BYPASS) && (val & PLL_BASE_BYPASS))
 		return parent_rate;
 
 	if ((pll->flags & TEGRA_PLL_FIXED) && !(val & PLL_BASE_OVERRIDE)) {
@@ -671,6 +674,7 @@ struct clk *tegra_clk_register_pll(const char *name, const char *parent_name,
 	struct tegra_clk_pll *pll;
 	struct clk *clk;
 
+	pll_flags |= TEGRA_PLL_BYPASS;
 	pll = _tegra_init_pll(clk_base, pmc, fixed_rate, pll_params, pll_flags,
 			      freq_table, lock);
 	if (IS_ERR(pll))
@@ -692,8 +696,8 @@ struct clk *tegra_clk_register_plle(const char *name, const char *parent_name,
 {
 	struct tegra_clk_pll *pll;
 	struct clk *clk;
-	pll_flags |= TEGRA_PLL_LOCK_MISC;
 
+	pll_flags |= TEGRA_PLL_LOCK_MISC | TEGRA_PLL_BYPASS;
 	pll = _tegra_init_pll(clk_base, pmc, fixed_rate, pll_params, pll_flags,
 			      freq_table, lock);
 	if (IS_ERR(pll))
diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
index b9691dd..fff520a 100644
--- a/drivers/clk/tegra/clk.h
+++ b/drivers/clk/tegra/clk.h
@@ -184,6 +184,7 @@ struct tegra_clk_pll_params {
  * TEGRA_PLLE_CONFIGURE - Configure PLLE when enabling.
  * TEGRA_PLL_LOCK_MISC - Lock bit is in the misc register instead of the
  *     base register.
+ * TEGRA_PLL_BYPASS - PLL has bypass bit
  */
 struct tegra_clk_pll {
 	struct clk_hw	hw;
@@ -213,6 +214,7 @@ struct tegra_clk_pll {
 #define TEGRA_PLL_FIXED BIT(6)
 #define TEGRA_PLLE_CONFIGURE BIT(7)
 #define TEGRA_PLL_LOCK_MISC BIT(8)
+#define TEGRA_PLL_BYPASS BIT(9)
 
 extern const struct clk_ops tegra_clk_pll_ops;
 extern const struct clk_ops tegra_clk_plle_ops;
-- 
1.7.7.rc0.72.g4b5ea.dirty

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