linux-kernel - [PATCH 1/3] clk: meson-pll: add reduced specific clk

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Message-Id: <20190307141455.23879-2-narmstrong@baylibre.com>
Date:   Thu,  7 Mar 2019 15:14:53 +0100
From:   Neil Armstrong <narmstrong@...libre.com>
To:     jbrunet@...libre.com
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        linux-clk@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] clk: meson-pll: add reduced specific clk_ops for G12A PCIe PLL

The Meson G12A PCIE PLL is fined tuned to deliver a very precise
100MHz reference clock for the PCIe Analog PHY, and thus requires
a strict register sequence to enable the PLL.
To simplify, use the _init() op to enable the PLL and keep
the other ops except set_rate since the rate is fixed.

Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/clk/meson/clk-pll.c | 26 ++++++++++++++++++++++++++
 drivers/clk/meson/clk-pll.h |  1 +
 2 files changed, 27 insertions(+)

diff --git a/drivers/clk/meson/clk-pll.c b/drivers/clk/meson/clk-pll.c
index 41e16dd7272a..6a88dd75ccf0 100644
--- a/drivers/clk/meson/clk-pll.c
+++ b/drivers/clk/meson/clk-pll.c
@@ -303,6 +303,16 @@ static int meson_clk_pll_is_enabled(struct clk_hw *hw)
 	return 1;
 }
 
+static int meson_clk_pcie_pll_enable(struct clk_hw *hw)
+{
+	meson_clk_pll_init(hw);
+
+	if (meson_clk_pll_wait_lock(hw))
+		return -EIO;
+
+	return 0;
+}
+
 static int meson_clk_pll_enable(struct clk_hw *hw)
 {
 	struct clk_regmap *clk = to_clk_regmap(hw);
@@ -387,6 +397,22 @@ static int meson_clk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
 	return 0;
 }
 
+/*
+ * The Meson G12A PCIE PLL is fined tuned to deliver a very precise
+ * 100MHz reference clock for the PCIe Analog PHY, and thus requires
+ * a strict register sequence to enable the PLL.
+ * To simplify, re-use the _init() op to enable the PLL and keep
+ * the other ops except set_rate since the rate is fixed.
+ */
+const struct clk_ops meson_clk_pcie_pll_ops = {
+	.recalc_rate	= meson_clk_pll_recalc_rate,
+	.round_rate	= meson_clk_pll_round_rate,
+	.is_enabled	= meson_clk_pll_is_enabled,
+	.enable		= meson_clk_pcie_pll_enable,
+	.disable	= meson_clk_pll_disable
+};
+EXPORT_SYMBOL_GPL(meson_clk_pcie_pll_ops);
+
 const struct clk_ops meson_clk_pll_ops = {
 	.init		= meson_clk_pll_init,
 	.recalc_rate	= meson_clk_pll_recalc_rate,
diff --git a/drivers/clk/meson/clk-pll.h b/drivers/clk/meson/clk-pll.h
index 55af2e285b1b..367efd0f6410 100644
--- a/drivers/clk/meson/clk-pll.h
+++ b/drivers/clk/meson/clk-pll.h
@@ -45,5 +45,6 @@ struct meson_clk_pll_data {
 
 extern const struct clk_ops meson_clk_pll_ro_ops;
 extern const struct clk_ops meson_clk_pll_ops;
+extern const struct clk_ops meson_clk_pcie_pll_ops;
 
 #endif /* __MESON_CLK_PLL_H */
-- 
2.20.1