linux-kernel - [PATCH V3 8/8] clk: imx7d: only enable minimum required clocks

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Date:	Thu, 30 Jun 2016 17:31:18 +0800
From:	Dong Aisheng <aisheng.dong@....com>
To:	<linux-clk@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>, <sboyd@...eaurora.org>,
	<mturquette@...libre.com>, <shawnguo@...nel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <aisheng.dong@....com>,
	<anson.huang@....com>
Subject: [PATCH V3 8/8] clk: imx7d: only enable minimum required clocks

Formerly clk core does not support imx7d clock type well that all
its clock operations requires the parent clock on.
Therefore we enabled all clocks by default in clock driver
initialization for other module clocks operate well.

After patch 'clk: imx7d: using api with flag CLK_OPS_PARENT_ENABLE',
clk core can handle such clock type well, so we don't have to enable
them all by default anymore. Instead, we only enable a minimum required
set of clocks.

Cc: Michael Turquette <mturquette@...libre.com>
Cc: Stephen Boyd <sboyd@...eaurora.org>
Cc: Shawn Guo <shawnguo@...nel.org>
Signed-off-by: Dong Aisheng <aisheng.dong@....com>
---
 drivers/clk/imx/clk-imx7d.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/clk/imx/clk-imx7d.c b/drivers/clk/imx/clk-imx7d.c
index bb5affae0850..7b46ed0677a5 100644
--- a/drivers/clk/imx/clk-imx7d.c
+++ b/drivers/clk/imx/clk-imx7d.c
@@ -361,6 +361,14 @@ static const char *pll_enet_bypass_sel[] = { "pll_enet_main", "pll_enet_main_src
 static const char *pll_audio_bypass_sel[] = { "pll_audio_main", "pll_audio_main_src", };
 static const char *pll_video_bypass_sel[] = { "pll_video_main", "pll_video_main_src", };
 
+static int const clks_init_on[] __initconst = {
+	IMX7D_ARM_A7_ROOT_CLK, IMX7D_MAIN_AXI_ROOT_CLK,
+	IMX7D_PLL_SYS_MAIN_480M_CLK, IMX7D_NAND_USDHC_BUS_ROOT_CLK,
+	IMX7D_DRAM_PHYM_ROOT_CLK, IMX7D_DRAM_ROOT_CLK,
+	IMX7D_DRAM_PHYM_ALT_ROOT_CLK, IMX7D_DRAM_ALT_ROOT_CLK,
+	IMX7D_AHB_CHANNEL_ROOT_CLK,
+};
+
 static struct clk_onecell_data clk_data;
 
 static struct clk ** const uart_clks[] __initconst = {
@@ -846,14 +854,8 @@ static void __init imx7d_clocks_init(struct device_node *ccm_node)
 	clk_data.clk_num = ARRAY_SIZE(clks);
 	of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
 
-	/* TO BE FIXED LATER
-	 * Enable all clock to bring up imx7, otherwise system will be halt and block
-	 * the other part upstream Because imx7d clock design changed, clock framework
-	 * need do a little modify.
-	 * Dong Aisheng is working on this. After that, this part need be changed.
-	 */
-	for (i = 0; i < IMX7D_CLK_END; i++)
-		clk_prepare_enable(clks[i]);
+	for (i = 0; i < ARRAY_SIZE(clks_init_on); i++)
+		clk_prepare_enable(clks[clks_init_on[i]]);
 
 	/* use old gpt clk setting, gpt1 root clk must be twice as gpt counter freq */
 	clk_set_parent(clks[IMX7D_GPT1_ROOT_SRC], clks[IMX7D_OSC_24M_CLK]);
-- 
1.9.1