linux-kernel - Re: [PATCHv3 5/5] clk: samsung: exynos542x: Move FSYS subsystem clocks to its sub-CMU

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Date:   Wed, 11 Mar 2020 15:42:48 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Anand Moon <linux.amoon@...il.com>
Cc:     linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Felipe Balbi <balbi@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Subject: Re: [PATCHv3 5/5] clk: samsung: exynos542x: Move FSYS subsystem
 clocks to its sub-CMU

On Tue, Mar 10, 2020 at 07:48:54PM +0000, Anand Moon wrote:
> FSYS power domain support usbdrd3, pdma and usb2 power gaiting,
> hence move FSYS clk setting to sub-CMU block to support power domain
> on/off sequences for device nodes.
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
> New patch in the series
> ---
>  drivers/clk/samsung/clk-exynos5420.c | 45 +++++++++++++++++++++-------
>  1 file changed, 34 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/clk/samsung/clk-exynos5420.c b/drivers/clk/samsung/clk-exynos5420.c
> index c9e5a1fb6653..6c4c47dfcdce 100644
> --- a/drivers/clk/samsung/clk-exynos5420.c
> +++ b/drivers/clk/samsung/clk-exynos5420.c
> @@ -859,12 +859,6 @@ static const struct samsung_div_clock exynos5x_div_clks[] __initconst = {
>  	DIV(0, "dout_maudio0", "mout_maudio0", DIV_MAU, 20, 4),
>  	DIV(0, "dout_maupcm0", "dout_maudio0", DIV_MAU, 24, 8),
>  
> -	/* USB3.0 */
> -	DIV(0, "dout_usbphy301", "mout_usbd301", DIV_FSYS0, 12, 4),
> -	DIV(0, "dout_usbphy300", "mout_usbd300", DIV_FSYS0, 16, 4),
> -	DIV(0, "dout_usbd301", "mout_usbd301", DIV_FSYS0, 20, 4),
> -	DIV(0, "dout_usbd300", "mout_usbd300", DIV_FSYS0, 24, 4),

According to clock diagram these are still in CMU TOP, not FSYS.

> -
>  	/* MMC */
>  	DIV(0, "dout_mmc0", "mout_mmc0", DIV_FSYS1, 0, 10),
>  	DIV(0, "dout_mmc1", "mout_mmc1", DIV_FSYS1, 10, 10),
> @@ -1031,8 +1025,6 @@ static const struct samsung_gate_clock exynos5x_gate_clks[] __initconst = {
/>  
>  	/* FSYS Block */
>  	GATE(CLK_TSI, "tsi", "aclk200_fsys", GATE_BUS_FSYS0, 0, 0, 0),
> -	GATE(CLK_PDMA0, "pdma0", "aclk200_fsys", GATE_BUS_FSYS0, 1, 0, 0),
> -	GATE(CLK_PDMA1, "pdma1", "aclk200_fsys", GATE_BUS_FSYS0, 2, 0, 0),
>  	GATE(CLK_UFS, "ufs", "aclk200_fsys2", GATE_BUS_FSYS0, 3, 0, 0),
>  	GATE(CLK_RTIC, "rtic", "aclk200_fsys", GATE_IP_FSYS, 9, 0, 0),
>  	GATE(CLK_MMC0, "mmc0", "aclk200_fsys2", GATE_IP_FSYS, 12, 0, 0),
> @@ -1040,9 +1032,6 @@ static const struct samsung_gate_clock exynos5x_gate_clks[] __initconst = {
>  	GATE(CLK_MMC2, "mmc2", "aclk200_fsys2", GATE_IP_FSYS, 14, 0, 0),
>  	GATE(CLK_SROMC, "sromc", "aclk200_fsys2",
>  			GATE_IP_FSYS, 17, CLK_IGNORE_UNUSED, 0),
> -	GATE(CLK_USBH20, "usbh20", "aclk200_fsys", GATE_IP_FSYS, 18, 0, 0),
> -	GATE(CLK_USBD300, "usbd300", "aclk200_fsys", GATE_IP_FSYS, 19, 0, 0),
> -	GATE(CLK_USBD301, "usbd301", "aclk200_fsys", GATE_IP_FSYS, 20, 0, 0),
>  	GATE(CLK_SCLK_UNIPRO, "sclk_unipro", "dout_unipro",
>  			SRC_MASK_FSYS, 24, CLK_SET_RATE_PARENT, 0),
>  
> @@ -1258,6 +1247,28 @@ static struct exynos5_subcmu_reg_dump exynos5x_gsc_suspend_regs[] = {
>  	{ DIV2_RATIO0, 0, 0x30 },	/* DIV dout_gscl_blk_300 */
>  };
>  
> +/* USB3.0 */
> +static const struct samsung_div_clock exynos5x_fsys_div_clks[] __initconst = {
> +	DIV(0, "dout_usbphy301", "mout_usbd301", DIV_FSYS0, 12, 4),
> +	DIV(0, "dout_usbphy300", "mout_usbd300", DIV_FSYS0, 16, 4),
> +	DIV(0, "dout_usbd301", "mout_usbd301", DIV_FSYS0, 20, 4),
> +	DIV(0, "dout_usbd300", "mout_usbd300", DIV_FSYS0, 24, 4),
> +};
> +
> +static const struct samsung_gate_clock exynos5x_fsys_gate_clks[] __initconst = {
> +	GATE(CLK_PDMA0, "pdma0", "aclk200_fsys", GATE_BUS_FSYS0, 1, 0, 0),
> +	GATE(CLK_PDMA1, "pdma1", "aclk200_fsys", GATE_BUS_FSYS0, 2, 0, 0),
> +	GATE(CLK_USBH20, "usbh20", "aclk200_fsys", GATE_IP_FSYS, 18, 0, 0),
> +	GATE(CLK_USBD300, "usbd300", "aclk200_fsys", GATE_IP_FSYS, 19, 0, 0),
> +	GATE(CLK_USBD301, "usbd301", "aclk200_fsys", GATE_IP_FSYS, 20, 0, 0),
> +};
> +
> +static struct exynos5_subcmu_reg_dump exynos5x_fsys_suspend_regs[] = {
> +	{ GATE_IP_FSYS, 0xffffffff, 0xffffffff }, /* FSYS gates */

This looks wrong. GATE_IP_FSYS has fields also for FSYS2 clocks which
you are not suspending. They do not belong to this CMU.

Don't you need to save also parts of GATE_BUS_FSYS0?

> +	{ SRC_TOP3, 0, BIT(24) },                 /* SW_MUX_PCLK_200_FSYS_SEL */
> +	{ SRC_TOP3, 0, BIT(28) },                 /* SW_MUX_ACLK_200_FSYS_SEL */

Name of clocks from the driver please, not from datasheet. Look at other
examples.

Best regards,
Krzysztof


> +};
> +
>  static const struct samsung_gate_clock exynos5x_g3d_gate_clks[] __initconst = {
>  	GATE(CLK_G3D, "g3d", "mout_user_aclk_g3d", GATE_IP_G3D, 9,
>  	     CLK_SET_RATE_PARENT, 0),
> @@ -1376,12 +1387,23 @@ static const struct exynos5_subcmu_info exynos5800_mau_subcmu = {
>  	.pd_name	= "MAU",
>  };
>  
> +static const struct exynos5_subcmu_info exynos5x_fsys_subcmu = {
> +	.div_clks       = exynos5x_fsys_div_clks,
> +	.nr_div_clks    = ARRAY_SIZE(exynos5x_fsys_div_clks),
> +	.gate_clks	= exynos5x_fsys_gate_clks,
> +	.nr_gate_clks	= ARRAY_SIZE(exynos5x_fsys_gate_clks),
> +	.suspend_regs	= exynos5x_fsys_suspend_regs,
> +	.nr_suspend_regs = ARRAY_SIZE(exynos5x_fsys_suspend_regs),
> +	.pd_name	= "FSYS",
> +};
> +
>  static const struct exynos5_subcmu_info *exynos5x_subcmus[] = {
>  	&exynos5x_disp_subcmu,
>  	&exynos5x_gsc_subcmu,
>  	&exynos5x_g3d_subcmu,
>  	&exynos5x_mfc_subcmu,
>  	&exynos5x_mscl_subcmu,
> +	&exynos5x_fsys_subcmu,
>  };
>  
>  static const struct exynos5_subcmu_info *exynos5800_subcmus[] = {
> @@ -1391,6 +1413,7 @@ static const struct exynos5_subcmu_info *exynos5800_subcmus[] = {
>  	&exynos5x_mfc_subcmu,
>  	&exynos5x_mscl_subcmu,
>  	&exynos5800_mau_subcmu,
> +	&exynos5x_fsys_subcmu,
>  };
>  
>  static const struct samsung_pll_rate_table exynos5420_pll2550x_24mhz_tbl[] __initconst = {
> -- 
> 2.25.1
>