Re: [PATCH v2 07/14] clk: imx7ulp: make it easy to change ARM core clk

From: Shawn Guo
Date: Tue Mar 10 2020 - 02:10:06 EST


On Wed, Feb 19, 2020 at 03:59:50PM +0800, peng.fan@xxxxxxx wrote:
> From: Peng Fan <peng.fan@xxxxxxx>
>
> ARM clk could only source from divcore or hsrun_divcore.
>
> However 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.

It sounds a bit hackish, so would like to hear an ACK from Stephen on
it.

Shawn

>
> 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@xxxxxxx>
> ---
> 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
>