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    SubjectRe: [PATCH 1/4] clk: imx8mn: A53 core clock no need to be critical
    Date
    Hi Anson,

    One comment inline:

    On 25.02.2020 10:49, Anson Huang wrote:
    > 'A53_CORE' is just a mux and no need to be critical, being critical
    > will cause its parent clock always ON which does NOT make sense,
    > to make sure CPU's hardware clock source NOT being disabled during
    > clock tree setup, need to move the 'A53_SRC'/'A53_CORE' reparent
    > operations to after critical clock 'ARM_CLK' setup finished.
    >
    > Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
    > ---
    > drivers/clk/imx/clk-imx8mn.c | 8 ++++----
    > 1 file changed, 4 insertions(+), 4 deletions(-)
    >
    > diff --git a/drivers/clk/imx/clk-imx8mn.c b/drivers/clk/imx/clk-imx8mn.c
    > index 83618af..0bc7070 100644
    > --- a/drivers/clk/imx/clk-imx8mn.c
    > +++ b/drivers/clk/imx/clk-imx8mn.c
    > @@ -428,7 +428,7 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
    > hws[IMX8MN_CLK_GPU_SHADER_DIV] = hws[IMX8MN_CLK_GPU_SHADER];
    >
    > /* CORE SEL */
    > - hws[IMX8MN_CLK_A53_CORE] = imx_clk_hw_mux2_flags("arm_a53_core", base + 0x9880, 24, 1, imx8mn_a53_core_sels, ARRAY_SIZE(imx8mn_a53_core_sels), CLK_IS_CRITICAL);
    > + hws[IMX8MN_CLK_A53_CORE] = imx_clk_hw_mux2("arm_a53_core", base + 0x9880, 24, 1, imx8mn_a53_core_sels, ARRAY_SIZE(imx8mn_a53_core_sels));
    >
    > /* BUS */
    > hws[IMX8MN_CLK_MAIN_AXI] = imx8m_clk_hw_composite_critical("main_axi", imx8mn_main_axi_sels, base + 0x8800);
    > @@ -559,15 +559,15 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
    >
    > hws[IMX8MN_CLK_DRAM_ALT_ROOT] = imx_clk_hw_fixed_factor("dram_alt_root", "dram_alt", 1, 4);
    >
    > - clk_hw_set_parent(hws[IMX8MN_CLK_A53_SRC], hws[IMX8MN_SYS_PLL1_800M]);
    > - clk_hw_set_parent(hws[IMX8MN_CLK_A53_CORE], hws[IMX8MN_ARM_PLL_OUT]);


    Why do you need to move this code? If there is a reason please add a
    separate patch and explain why.

    > -
    > hws[IMX8MN_CLK_ARM] = imx_clk_hw_cpu("arm", "arm_a53_core",
    > hws[IMX8MN_CLK_A53_CORE]->clk,
    > hws[IMX8MN_CLK_A53_CORE]->clk,
    > hws[IMX8MN_ARM_PLL_OUT]->clk,
    > hws[IMX8MN_CLK_A53_DIV]->clk);
    >
    > + clk_hw_set_parent(hws[IMX8MN_CLK_A53_SRC], hws[IMX8MN_SYS_PLL1_800M]);
    > + clk_hw_set_parent(hws[IMX8MN_CLK_A53_CORE], hws[IMX8MN_ARM_PLL_OUT]);
    > +
    > imx_check_clk_hws(hws, IMX8MN_CLK_END);
    >
    > ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_hw_data);


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