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Date:   Wed, 8 Aug 2018 08:48:57 +0000
From:   Peng Fan <peng.fan@....com>
To:     Anson Huang <anson.huang@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Rob Herring <robh@...nel.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH 2/2] clk: imx: imx7d: remove clks_init_on array



> -----Original Message-----
> From: Anson Huang
> Sent: 2018年8月8日 12:39
> To: shawnguo@...nel.org; s.hauer@...gutronix.de; kernel@...gutronix.de;
> Fabio Estevam <fabio.estevam@....com>; mturquette@...libre.com;
> sboyd@...nel.org; linux-arm-kernel@...ts.infradead.org;
> linux-clk@...r.kernel.org; linux-kernel@...r.kernel.org
> Cc: dl-linux-imx <linux-imx@....com>
> Subject: [PATCH 2/2] clk: imx: imx7d: remove clks_init_on array
> 
> Clock framework will enable those clocks registered with CLK_IS_CRITICAL flag,
> so no need to have clks_init_on array during clock initialization now.

Will it be more flexible to parse dts saying "critical-clocks = <xxx>" or "init-on-arrary=<xxx>"
and enable those clocks?

Regards,
Peng.

> 
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
>  drivers/clk/imx/clk-imx7d.c | 27 ++++++++-------------------
>  drivers/clk/imx/clk.h       |  7 +++++++
>  2 files changed, 15 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/clk/imx/clk-imx7d.c b/drivers/clk/imx/clk-imx7d.c index
> c4518d7..076460b 100644
> --- a/drivers/clk/imx/clk-imx7d.c
> +++ b/drivers/clk/imx/clk-imx7d.c
> @@ -379,13 +379,6 @@ 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_IPG_ROOT_CLK,
> -	IMX7D_DRAM_PHYM_ROOT_CLK, IMX7D_DRAM_ROOT_CLK,
> -	IMX7D_DRAM_PHYM_ALT_ROOT_CLK, IMX7D_DRAM_ALT_ROOT_CLK,
> -};
> -
>  static struct clk_onecell_data clk_data;
> 
>  static struct clk ** const uart_clks[] __initconst = { @@ -403,7 +396,6 @@
> static void __init imx7d_clocks_init(struct device_node *ccm_node)  {
>  	struct device_node *np;
>  	void __iomem *base;
> -	int i;
> 
>  	clks[IMX7D_CLK_DUMMY] = imx_clk_fixed("dummy", 0);
>  	clks[IMX7D_OSC_24M_CLK] = of_clk_get_by_name(ccm_node, "osc"); @@
> -466,7 +458,7 @@ static void __init imx7d_clocks_init(struct device_node
> *ccm_node)
>  	clks[IMX7D_PLL_SYS_MAIN_120M] =
> imx_clk_fixed_factor("pll_sys_main_120m", "pll_sys_main_clk", 1, 4);
>  	clks[IMX7D_PLL_DRAM_MAIN_533M] =
> imx_clk_fixed_factor("pll_dram_533m", "pll_dram_main_clk", 1, 2);
> 
> -	clks[IMX7D_PLL_SYS_MAIN_480M_CLK] =
> imx_clk_gate_dis("pll_sys_main_480m_clk", "pll_sys_main_480m", base + 0xb0,
> 4);
> +	clks[IMX7D_PLL_SYS_MAIN_480M_CLK] =
> +imx_clk_gate_dis_flags("pll_sys_main_480m_clk", "pll_sys_main_480m",
> +base + 0xb0, 4, CLK_IS_CRITICAL);
>  	clks[IMX7D_PLL_SYS_MAIN_240M_CLK] =
> imx_clk_gate_dis("pll_sys_main_240m_clk", "pll_sys_main_240m", base + 0xb0,
> 5);
>  	clks[IMX7D_PLL_SYS_MAIN_120M_CLK] =
> imx_clk_gate_dis("pll_sys_main_120m_clk", "pll_sys_main_120m", base + 0xb0,
> 6);
>  	clks[IMX7D_PLL_DRAM_MAIN_533M_CLK] =
> imx_clk_gate("pll_dram_533m_clk", "pll_dram_533m", base + 0x70, 12); @@
> -719,7 +711,7 @@ static void __init imx7d_clocks_init(struct device_node
> *ccm_node)
>  	clks[IMX7D_ENET_AXI_ROOT_DIV] =
> imx_clk_divider2("enet_axi_post_div", "enet_axi_pre_div", base + 0x8900, 0, 6);
>  	clks[IMX7D_NAND_USDHC_BUS_ROOT_CLK] =
> imx_clk_divider2("nand_usdhc_root_clk", "nand_usdhc_pre_div", base +
> 0x8980, 0, 6);
>  	clks[IMX7D_AHB_CHANNEL_ROOT_DIV] =
> imx_clk_divider2("ahb_root_clk", "ahb_pre_div", base + 0x9000, 0, 6);
> -	clks[IMX7D_IPG_ROOT_CLK] = imx_clk_divider2("ipg_root_clk",
> "ahb_root_clk", base + 0x9080, 0, 2);
> +	clks[IMX7D_IPG_ROOT_CLK] = imx_clk_divider_flags("ipg_root_clk",
> +"ahb_root_clk", base + 0x9080, 0, 2, CLK_IS_CRITICAL |
> +CLK_OPS_PARENT_ENABLE | CLK_SET_RATE_PARENT);
>  	clks[IMX7D_DRAM_ROOT_DIV] = imx_clk_divider2("dram_post_div",
> "dram_cg", base + 0x9880, 0, 3);
>  	clks[IMX7D_DRAM_PHYM_ALT_ROOT_DIV] =
> imx_clk_divider2("dram_phym_alt_post_div", "dram_phym_alt_pre_div", base
> + 0xa000, 0, 3);
>  	clks[IMX7D_DRAM_ALT_ROOT_DIV] =
> imx_clk_divider2("dram_alt_post_div", "dram_alt_pre_div", base + 0xa080, 0,
> 3); @@ -783,17 +775,17 @@ static void __init imx7d_clocks_init(struct
> device_node *ccm_node)
>  	clks[IMX7D_CLKO1_ROOT_DIV] = imx_clk_divider2("clko1_post_div",
> "clko1_pre_div", base + 0xbd80, 0, 6);
>  	clks[IMX7D_CLKO2_ROOT_DIV] = imx_clk_divider2("clko2_post_div",
> "clko2_pre_div", base + 0xbe00, 0, 6);
> 
> -	clks[IMX7D_ARM_A7_ROOT_CLK] = imx_clk_gate4("arm_a7_root_clk",
> "arm_a7_div", base + 0x4000, 0);
> +	clks[IMX7D_ARM_A7_ROOT_CLK] =
> imx_clk_gate2_flags("arm_a7_root_clk",
> +"arm_a7_div", base + 0x4000, 0, CLK_IS_CRITICAL |
> +CLK_OPS_PARENT_ENABLE);
>  	clks[IMX7D_ARM_M4_ROOT_CLK] = imx_clk_gate4("arm_m4_root_clk",
> "arm_m4_div", base + 0x4010, 0);
> -	clks[IMX7D_MAIN_AXI_ROOT_CLK] = imx_clk_gate4("main_axi_root_clk",
> "axi_post_div", base + 0x4040, 0);
> +	clks[IMX7D_MAIN_AXI_ROOT_CLK] =
> +imx_clk_gate2_flags("main_axi_root_clk", "axi_post_div", base + 0x4040,
> +0, CLK_IS_CRITICAL | CLK_OPS_PARENT_ENABLE);
>  	clks[IMX7D_DISP_AXI_ROOT_CLK] = imx_clk_gate4("disp_axi_root_clk",
> "disp_axi_post_div", base + 0x4050, 0);
>  	clks[IMX7D_ENET_AXI_ROOT_CLK] = imx_clk_gate4("enet_axi_root_clk",
> "enet_axi_post_div", base + 0x4060, 0);
>  	clks[IMX7D_OCRAM_CLK] = imx_clk_gate4("ocram_clk",
> "main_axi_root_clk", base + 0x4110, 0);
>  	clks[IMX7D_OCRAM_S_CLK] = imx_clk_gate4("ocram_s_clk",
> "ahb_root_clk", base + 0x4120, 0);
> -	clks[IMX7D_DRAM_ROOT_CLK] = imx_clk_gate4("dram_root_clk",
> "dram_post_div", base + 0x4130, 0);
> -	clks[IMX7D_DRAM_PHYM_ROOT_CLK] =
> imx_clk_gate4("dram_phym_root_clk", "dram_phym_cg", base + 0x4130, 0);
> -	clks[IMX7D_DRAM_PHYM_ALT_ROOT_CLK] =
> imx_clk_gate4("dram_phym_alt_root_clk", "dram_phym_alt_post_div", base +
> 0x4130, 0);
> -	clks[IMX7D_DRAM_ALT_ROOT_CLK] = imx_clk_gate4("dram_alt_root_clk",
> "dram_alt_post_div", base + 0x4130, 0);
> +	clks[IMX7D_DRAM_ROOT_CLK] = imx_clk_gate2_flags("dram_root_clk",
> "dram_post_div", base + 0x4130, 0, CLK_IS_CRITICAL |
> CLK_OPS_PARENT_ENABLE);
> +	clks[IMX7D_DRAM_PHYM_ROOT_CLK] =
> imx_clk_gate2_flags("dram_phym_root_clk", "dram_phym_cg", base + 0x4130,
> 0, CLK_IS_CRITICAL | CLK_OPS_PARENT_ENABLE);
> +	clks[IMX7D_DRAM_PHYM_ALT_ROOT_CLK] =
> imx_clk_gate2_flags("dram_phym_alt_root_clk", "dram_phym_alt_post_div",
> base + 0x4130, 0, CLK_IS_CRITICAL | CLK_OPS_PARENT_ENABLE);
> +	clks[IMX7D_DRAM_ALT_ROOT_CLK] =
> +imx_clk_gate2_flags("dram_alt_root_clk", "dram_alt_post_div", base +
> +0x4130, 0, CLK_IS_CRITICAL | CLK_OPS_PARENT_ENABLE);
>  	clks[IMX7D_OCOTP_CLK] = imx_clk_gate4("ocotp_clk", "ipg_root_clk",
> base + 0x4230, 0);
>  	clks[IMX7D_SNVS_CLK] = imx_clk_gate4("snvs_clk", "ipg_root_clk", base +
> 0x4250, 0);
>  	clks[IMX7D_MU_ROOT_CLK] = imx_clk_gate4("mu_root_clk",
> "ipg_root_clk", base + 0x4270, 0); @@ -882,9 +874,6 @@ 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);
> 
> -	for (i = 0; i < ARRAY_SIZE(clks_init_on); i++)
> -		clk_prepare_enable(clks[clks_init_on[i]]);
> -
>  	clk_set_parent(clks[IMX7D_PLL_ARM_MAIN_BYPASS],
> clks[IMX7D_PLL_ARM_MAIN]);
>  	clk_set_parent(clks[IMX7D_PLL_DRAM_MAIN_BYPASS],
> clks[IMX7D_PLL_DRAM_MAIN]);
>  	clk_set_parent(clks[IMX7D_PLL_SYS_MAIN_BYPASS],
> clks[IMX7D_PLL_SYS_MAIN]); diff --git a/drivers/clk/imx/clk.h
> b/drivers/clk/imx/clk.h index 8076ec0..5895e223 100644
> --- a/drivers/clk/imx/clk.h
> +++ b/drivers/clk/imx/clk.h
> @@ -137,6 +137,13 @@ static inline struct clk *imx_clk_gate_dis(const char
> *name, const char *parent,
>  			shift, CLK_GATE_SET_TO_DISABLE, &imx_ccm_lock);  }
> 
> +static inline struct clk *imx_clk_gate_dis_flags(const char *name, const char
> *parent,
> +		void __iomem *reg, u8 shift, unsigned long flags) {
> +	return clk_register_gate(NULL, name, parent, flags |
> CLK_SET_RATE_PARENT, reg,
> +			shift, CLK_GATE_SET_TO_DISABLE, &imx_ccm_lock); }
> +
>  static inline struct clk *imx_clk_gate2(const char *name, const char *parent,
>  		void __iomem *reg, u8 shift)
>  {
> --
> 2.7.4

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