linux-kernel - RE: [PATCH V3] clk: imx7ulp: make it easy to change ARM core clk

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Date:   Fri, 10 Apr 2020 02:57:16 +0000
From:   Peng Fan <peng.fan@....com>
To:     "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        Aisheng Dong <aisheng.dong@....com>,
        Abel Vesa <abel.vesa@....com>,
        Anson Huang <anson.huang@....com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH V3] clk: imx7ulp: make it easy to change ARM core clk

> Subject: [PATCH V3] clk: imx7ulp: make it easy to change ARM core clk

This patch is important for us to support cpufreq on i.MX7ULP,
Could I have any A-b or R-b tags?

Thanks,
Peng.

> 
> From: Peng Fan <peng.fan@....com>
> 
> ARM clk could only source from divcore or hsrun_divcore.
> 
> Follow what we already used on i.MX7D and i.MX8M SoCs, use
> imx_clk_hw_cpu API. When ARM core is running normaly, whether divcore or
> hwrun_divcore will finally source from SPLL_PFD0. However SPLL_PFD0 is
> marked with CLK_SET_GATE, so we need to disable SPLL_PFD0, when
> configure the rate.
> So add CORE and HSRUN_CORE virtual clk to make it easy to configure the clk
> using imx_clk_hw_cpu API.
> 
> Since CORE and HSRUN_CORE already marked with CLK_IS_CRITICAL, no
> need to set ARM as CLK_IS_CRITICAL. And when set the rate of ARM clk,
> prograting it the parent with CLK_SET_RATE_PARENT will finally set the
> SPLL_PFD0 clk.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
> 
> V3:
>  Update commit log. Make this a standalone patch from V2
> V2:
>  https://patchwork.kernel.org/patch/11390595/
>  No change
> 
>  drivers/clk/imx/clk-imx7ulp.c             | 6 ++++--
>  include/dt-bindings/clock/imx7ulp-clock.h | 5 ++++-
>  2 files changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/clk/imx/clk-imx7ulp.c b/drivers/clk/imx/clk-imx7ulp.c
> index 3710aa0dee9b..634c0b6636b0 100644
> --- a/drivers/clk/imx/clk-imx7ulp.c
> +++ b/drivers/clk/imx/clk-imx7ulp.c
> @@ -29,7 +29,7 @@ static const char * const ddr_sels[]		=
> { "apll_pfd_sel", "dummy", "dummy", "dum
>  static const char * const nic_sels[]		= { "firc", "ddr_clk", };
>  static const char * const periph_plat_sels[]	= { "dummy", "nic1_bus_clk",
> "nic1_clk", "ddr_clk", "apll_pfd2", "apll_pfd1", "apll_pfd0", "upll", };
>  static const char * const periph_bus_sels[]	= { "dummy", "sosc_bus_clk",
> "dummy", "firc_bus_clk", "rosc", "nic1_bus_clk", "nic1_clk", "spll_bus_clk", };
> -static const char * const arm_sels[]		= { "divcore", "dummy", "dummy",
> "hsrun_divcore", };
> +static const char * const arm_sels[]		= { "core", "dummy", "dummy",
> "hsrun_core", };
> 
>  /* used by sosc/sirc/firc/ddr/spll/apll dividers */  static const struct
> clk_div_table ulp_div_table[] = { @@ -121,7 +121,9 @@ static void __init
> imx7ulp_clk_scg1_init(struct device_node *np)
>  	hws[IMX7ULP_CLK_DDR_SEL]	= imx_clk_hw_mux_flags("ddr_sel",
> base + 0x30, 24, 2, ddr_sels, ARRAY_SIZE(ddr_sels), CLK_SET_RATE_PARENT |
> CLK_OPS_PARENT_ENABLE);
> 
>  	hws[IMX7ULP_CLK_CORE_DIV]	= imx_clk_hw_divider_flags("divcore",
> 	"scs_sel",  base + 0x14, 16, 4, CLK_SET_RATE_PARENT);
> +	hws[IMX7ULP_CLK_CORE]		= imx_clk_hw_cpu("core", "divcore",
> hws[IMX7ULP_CLK_CORE_DIV]->clk, hws[IMX7ULP_CLK_SYS_SEL]->clk,
> hws[IMX7ULP_CLK_SPLL_SEL]->clk, hws[IMX7ULP_CLK_FIRC]->clk);
>  	hws[IMX7ULP_CLK_HSRUN_CORE_DIV] =
> imx_clk_hw_divider_flags("hsrun_divcore", "hsrun_scs_sel", base + 0x1c, 16,
> 4, CLK_SET_RATE_PARENT);
> +	hws[IMX7ULP_CLK_HSRUN_CORE] = imx_clk_hw_cpu("hsrun_core",
> +"hsrun_divcore", hws[IMX7ULP_CLK_HSRUN_CORE_DIV]->clk,
> +hws[IMX7ULP_CLK_HSRUN_SYS_SEL]->clk,
> hws[IMX7ULP_CLK_SPLL_SEL]->clk,
> +hws[IMX7ULP_CLK_FIRC]->clk);
> 
>  	hws[IMX7ULP_CLK_DDR_DIV]	= imx_clk_hw_divider_gate("ddr_clk",
> "ddr_sel", CLK_SET_RATE_PARENT | CLK_IS_CRITICAL, base + 0x30, 0, 3,
>  							       0, ulp_div_table, &imx_ccm_lock);
> @@ -270,7 +272,7 @@ static void __init imx7ulp_clk_smc1_init(struct
> device_node *np)
>  	base = of_iomap(np, 0);
>  	WARN_ON(!base);
> 
> -	hws[IMX7ULP_CLK_ARM] = imx_clk_hw_mux_flags("arm", base + 0x10,
> 8, 2, arm_sels, ARRAY_SIZE(arm_sels), CLK_IS_CRITICAL);
> +	hws[IMX7ULP_CLK_ARM] = imx_clk_hw_mux_flags("arm", base + 0x10,
> 8, 2,
> +arm_sels, ARRAY_SIZE(arm_sels), CLK_SET_RATE_PARENT);
> 
>  	imx_check_clk_hws(hws, clk_data->num);
> 
> diff --git a/include/dt-bindings/clock/imx7ulp-clock.h
> b/include/dt-bindings/clock/imx7ulp-clock.h
> index 38145bdcd975..b58370d146e2 100644
> --- a/include/dt-bindings/clock/imx7ulp-clock.h
> +++ b/include/dt-bindings/clock/imx7ulp-clock.h
> @@ -58,7 +58,10 @@
>  #define IMX7ULP_CLK_HSRUN_SYS_SEL	44
>  #define IMX7ULP_CLK_HSRUN_CORE_DIV	45
> 
> -#define IMX7ULP_CLK_SCG1_END		46
> +#define IMX7ULP_CLK_CORE		46
> +#define IMX7ULP_CLK_HSRUN_CORE		47
> +
> +#define IMX7ULP_CLK_SCG1_END		48
> 
>  /* PCC2 */
>  #define IMX7ULP_CLK_DMA1		0
> --
> 2.16.4