linux-kernel - Re: [PATCH] clk: mediatek: mt8186: Change I2C 4/5/6 ap clocks parent to infra

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Date:   Fri, 20 Oct 2023 13:06:35 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     sboyd@...nel.org, mturquette@...libre.com, matthias.bgg@...il.com,
        u.kleine-koenig@...gutronix.de, chun-jie.chen@...iatek.com,
        miles.chen@...iatek.com, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] clk: mediatek: mt8186: Change I2C 4/5/6 ap clocks parent
 to infra

On Thu, Oct 19, 2023 at 8:49 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com> wrote:
>
> Fix the parenting of clocks imp_iic_wrap_ap_clock_i2c{4-6}, as those
> are effectively parented to infra_ao_i2c{4-6} and not to the I2C_AP.
> This permits the correct (and full) enablement and disablement of the
> I2C4, I2C5 and I2C6 bus clocks, satisfying the whole clock tree of
> those.
>
> As an example, when requesting to enable imp_iic_wrap_ap_clock_i2c4:
>
> Before: infra_ao_i2c_ap -> imp_iic_wrap_ap_clock_i2c4
> After:  infra_ao_i2c_ap -> infra_ao_i2c4 -> imp_iic_wrap_ap_clock_i2c4
>
> Fixes: 66cd0b4b0ce5 ("clk: mediatek: Add MT8186 imp i2c wrapper clock support")
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

I'm curious about what led to discovering this error?

ChenYu

> ---
>  drivers/clk/mediatek/clk-mt8186-imp_iic_wrap.c | 6 +++---
>  drivers/clk/mediatek/clk-mt8186-infra_ao.c     | 6 +++---
>  2 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/clk/mediatek/clk-mt8186-imp_iic_wrap.c b/drivers/clk/mediatek/clk-mt8186-imp_iic_wrap.c
> index 640ccb553274..871b8ff4c287 100644
> --- a/drivers/clk/mediatek/clk-mt8186-imp_iic_wrap.c
> +++ b/drivers/clk/mediatek/clk-mt8186-imp_iic_wrap.c
> @@ -29,11 +29,11 @@ static const struct mtk_gate imp_iic_wrap_clks[] = {
>         GATE_IMP_IIC_WRAP(CLK_IMP_IIC_WRAP_AP_CLOCK_I2C3,
>                 "imp_iic_wrap_ap_clock_i2c3", "infra_ao_i2c_ap", 3),
>         GATE_IMP_IIC_WRAP(CLK_IMP_IIC_WRAP_AP_CLOCK_I2C4,
> -               "imp_iic_wrap_ap_clock_i2c4", "infra_ao_i2c_ap", 4),
> +               "imp_iic_wrap_ap_clock_i2c4", "infra_ao_i2c4", 4),
>         GATE_IMP_IIC_WRAP(CLK_IMP_IIC_WRAP_AP_CLOCK_I2C5,
> -               "imp_iic_wrap_ap_clock_i2c5", "infra_ao_i2c_ap", 5),
> +               "imp_iic_wrap_ap_clock_i2c5", "infra_ao_i2c5", 5),
>         GATE_IMP_IIC_WRAP(CLK_IMP_IIC_WRAP_AP_CLOCK_I2C6,
> -               "imp_iic_wrap_ap_clock_i2c6", "infra_ao_i2c_ap", 6),
> +               "imp_iic_wrap_ap_clock_i2c6", "infra_ao_i2c6", 6),
>         GATE_IMP_IIC_WRAP(CLK_IMP_IIC_WRAP_AP_CLOCK_I2C7,
>                 "imp_iic_wrap_ap_clock_i2c7", "infra_ao_i2c_ap", 7),
>         GATE_IMP_IIC_WRAP(CLK_IMP_IIC_WRAP_AP_CLOCK_I2C8,
> diff --git a/drivers/clk/mediatek/clk-mt8186-infra_ao.c b/drivers/clk/mediatek/clk-mt8186-infra_ao.c
> index 837304cd0ed7..c490f1a310f8 100644
> --- a/drivers/clk/mediatek/clk-mt8186-infra_ao.c
> +++ b/drivers/clk/mediatek/clk-mt8186-infra_ao.c
> @@ -132,7 +132,7 @@ static const struct mtk_gate infra_ao_clks[] = {
>         GATE_INFRA_AO2(CLK_INFRA_AO_AUDIO_26M_BCLK, "infra_ao_audio26m", "clk26m", 4),
>         GATE_INFRA_AO2(CLK_INFRA_AO_SSUSB_TOP_P1_HCLK, "infra_ao_ssusb_p1_hclk", "top_axi", 5),
>         GATE_INFRA_AO2(CLK_INFRA_AO_SPI1, "infra_ao_spi1", "top_spi", 6),
> -       GATE_INFRA_AO2(CLK_INFRA_AO_I2C4, "infra_ao_i2c4", "top_i2c", 7),
> +       GATE_INFRA_AO2(CLK_INFRA_AO_I2C4, "infra_ao_i2c4", "infra_ao_i2c_ap", 7),
>         GATE_INFRA_AO2(CLK_INFRA_AO_MODEM_TEMP_SHARE, "infra_ao_mdtemp", "clk26m", 8),
>         GATE_INFRA_AO2(CLK_INFRA_AO_SPI2, "infra_ao_spi2", "top_spi", 9),
>         GATE_INFRA_AO2(CLK_INFRA_AO_SPI3, "infra_ao_spi3", "top_spi", 10),
> @@ -145,7 +145,7 @@ static const struct mtk_gate infra_ao_clks[] = {
>         GATE_INFRA_AO2_FLAGS(CLK_INFRA_AO_SSPM, "infra_ao_sspm", "top_sspm", 15, CLK_IS_CRITICAL),
>         GATE_INFRA_AO2(CLK_INFRA_AO_SSUSB_TOP_P1_SYS,
>                        "infra_ao_ssusb_p1_sys", "top_ssusb_1p", 16),
> -       GATE_INFRA_AO2(CLK_INFRA_AO_I2C5, "infra_ao_i2c5", "top_i2c", 18),
> +       GATE_INFRA_AO2(CLK_INFRA_AO_I2C5, "infra_ao_i2c5", "infra_ao_i2c_ap", 18),
>         GATE_INFRA_AO2(CLK_INFRA_AO_I2C5_ARBITER, "infra_ao_i2c5a", "top_i2c", 19),
>         GATE_INFRA_AO2(CLK_INFRA_AO_I2C5_IMM, "infra_ao_i2c5_imm", "top_i2c", 20),
>         GATE_INFRA_AO2(CLK_INFRA_AO_I2C1_ARBITER, "infra_ao_i2c1a", "top_i2c", 21),
> @@ -167,7 +167,7 @@ static const struct mtk_gate infra_ao_clks[] = {
>                              CLK_IS_CRITICAL),
>         GATE_INFRA_AO3_FLAGS(CLK_INFRA_AO_SSPM_32K_SELF, "infra_ao_sspm_32k", "clk32k", 4,
>                              CLK_IS_CRITICAL),
> -       GATE_INFRA_AO3(CLK_INFRA_AO_I2C6, "infra_ao_i2c6", "top_i2c", 6),
> +       GATE_INFRA_AO3(CLK_INFRA_AO_I2C6, "infra_ao_i2c6", "infra_ao_i2c_ap", 6),
>         GATE_INFRA_AO3(CLK_INFRA_AO_AP_MSDC0, "infra_ao_ap_msdc0", "top_axi", 7),
>         GATE_INFRA_AO3(CLK_INFRA_AO_MD_MSDC0, "infra_ao_md_msdc0", "top_axi", 8),
>         GATE_INFRA_AO3(CLK_INFRA_AO_MSDC0_SRC, "infra_ao_msdc0_clk", "top_msdc50_0", 9),
> --
> 2.42.0
>