linux-kernel - [PATCH v6 7/7] clk: mediatek: Enable critical clocks for MT2701

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Date:	Fri, 5 Feb 2016 17:37:30 +0800
From:	James Liao <jamesjj.liao@...iatek.com>
To:	Matthias Brugger <matthias.bgg@...il.com>,
	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Rob Herring <robh@...nel.org>
CC:	John Crispin <blogic@...nwrt.org>, Arnd Bergmann <arnd@...db.de>,
	Sascha Hauer <kernel@...gutronix.de>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	<srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-mediatek@...ts.infradead.org>, <linux-clk@...r.kernel.org>,
	James Liao <jamesjj.liao@...iatek.com>
Subject: [PATCH v6 7/7] clk: mediatek: Enable critical clocks for MT2701

Some system clocks should be turned on by default on MT2701.
This patch enable these clocks when related clocks have
been registered.

Signed-off-by: James Liao <jamesjj.liao@...iatek.com>
---
 drivers/clk/mediatek/clk-mt2701.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/mediatek/clk-mt2701.c b/drivers/clk/mediatek/clk-mt2701.c
index 01722e0..f7b4d52 100644
--- a/drivers/clk/mediatek/clk-mt2701.c
+++ b/drivers/clk/mediatek/clk-mt2701.c
@@ -573,6 +573,21 @@ static const struct mtk_gate top_clks[] __initconst = {
 	GATE_TOP_AUD(CLK_TOP_AUD_I2S6_MCLK, "aud_i2s6_mclk", "aud_k6_src_div", 28),
 };
 
+static struct clk_onecell_data *top_clk_data __initdata;
+static struct clk_onecell_data *pll_clk_data __initdata;
+
+static void __init mtk_clk_enable_critical(void)
+{
+	if (!top_clk_data || !pll_clk_data)
+		return;
+
+	clk_prepare_enable(pll_clk_data->clks[CLK_APMIXED_ARMPLL]);
+	clk_prepare_enable(top_clk_data->clks[CLK_TOP_AXI_SEL]);
+	clk_prepare_enable(top_clk_data->clks[CLK_TOP_MEM_SEL]);
+	clk_prepare_enable(top_clk_data->clks[CLK_TOP_DDRPHYCFG_SEL]);
+	clk_prepare_enable(top_clk_data->clks[CLK_TOP_RTC_SEL]);
+}
+
 static void __init mtk_topckgen_init(struct device_node *node)
 {
 	struct clk_onecell_data *clk_data;
@@ -585,7 +600,7 @@ static void __init mtk_topckgen_init(struct device_node *node)
 		return;
 	}
 
-	clk_data = mtk_alloc_clk_data(CLK_TOP_NR);
+	top_clk_data = clk_data = mtk_alloc_clk_data(CLK_TOP_NR);
 
 	mtk_clk_register_fixed_clks(top_fixed_clks, ARRAY_SIZE(top_fixed_clks),
 								clk_data);
@@ -606,6 +621,8 @@ static void __init mtk_topckgen_init(struct device_node *node)
 	if (r)
 		pr_err("%s(): could not register clock provider: %d\n",
 			__func__, r);
+
+	mtk_clk_enable_critical();
 }
 CLK_OF_DECLARE(mtk_topckgen, "mediatek,mt2701-topckgen", mtk_topckgen_init);
 
@@ -1201,7 +1218,7 @@ static void __init mtk_apmixedsys_init(struct device_node *node)
 	struct clk_onecell_data *clk_data;
 	int r;
 
-	clk_data = mtk_alloc_clk_data(ARRAY_SIZE(apmixed_plls));
+	pll_clk_data = clk_data = mtk_alloc_clk_data(ARRAY_SIZE(apmixed_plls));
 	if (!clk_data)
 		return;
 
@@ -1212,6 +1229,8 @@ static void __init mtk_apmixedsys_init(struct device_node *node)
 	if (r)
 		pr_err("%s(): could not register clock provider: %d\n",
 			__func__, r);
+
+	mtk_clk_enable_critical();
 }
 CLK_OF_DECLARE(mtk_apmixedsys, "mediatek,mt2701-apmixedsys",
 							mtk_apmixedsys_init);
-- 
1.9.1