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Subject: Re: [PATCH v5 2/8] clk: samsung: add new clocks for DMC for
 Exynos5422 SoC
To:     Lukasz Luba <l.luba@partner.samsung.com>,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org
Cc:     b.zolnierkie@samsung.com, krzk@kernel.org, kgene@kernel.org,
        kyungmin.park@samsung.com, m.szyprowski@samsung.com,
        s.nawrocki@samsung.com, myungjoo.ham@samsung.com
From:   Chanwoo Choi <cw00.choi@samsung.com>
Organization: Samsung Electronics
Message-ID: <d92cd97e-32fa-fd21-fd5d-bb7eb36bc2ab@samsung.com>
Date:   Wed, 6 Mar 2019 17:11:45 +0900
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Hi Lukasz,

You are missing some answer on v4 patch[1] and then
send the patch without modification. On many times,
I mentioned that please answer from the comment.

Please check the comments from reviewers
carefully without any lost.

- [v4,2/8] clk: samsung: add new clocks for DMC for Exynos5422 SoC
[1] https://lkml.org/lkml/2019/2/12/12

Please answer from the following comment.

[Following comments on v4 patch]
>>> +       DIV(0, "dout_pclk_drex0", "dout_cclk_drex0", DIV_CDREX0, 28, 3),
>>
>> Before applied this patch, on line 809, DIV_CDREX0[28:30] was already
>> defined with "dout_pclk_cdrex" gate clock name.
> In my previous email, I have mentioned that the same bits
> (8 combinations) are controlling 3 dividers, which re-branch to 3 edges
> in the clock tree named:
> CLKDIV_PCLK_CDREX, CLKDIV_PCLK_DREX0, CLKDIV_PCLK_DREX1.
> It is in the Exynos5422_UM_REV0.10 documentation section:
> 7.9.6.7 CLK_DIV_CDREX0

It is my missing point. I checked it on Exynos5422 TRM.
I want to develop the clocks according to H/W clock.
Please keep it without removal.

Instead,
It is very strange case. So, you need to add
the detailed comment when defining the multiple clocks
with same register/same bits. Also, in order to reduce
the confusion of this strange case, IMO you better to
define the three clocks at the nearby in this driver.
(CLKDIV_PCLK_CDREX, CLKDIV_PCLK_DREX0, CLKDIV_PCLK_DREX1)
If they are scattered, it is difficult for understanding
why they are developed like this.


On 19. 3. 5. 오후 7:19, Lukasz Luba wrote:
> This patch provides support for clocks needed for Dynamic Memory Controller
> in Exynos5422 SoC. It adds CDREX base register addresses, new DIV, MUX and
> GATE entries.
> 
> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
> ---
>  drivers/clk/samsung/clk-exynos5420.c | 54 +++++++++++++++++++++++++++++++++---
>  1 file changed, 50 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/clk/samsung/clk-exynos5420.c b/drivers/clk/samsung/clk-exynos5420.c
> index 34cce3c..6da5875 100644
> --- a/drivers/clk/samsung/clk-exynos5420.c
> +++ b/drivers/clk/samsung/clk-exynos5420.c
> @@ -134,6 +134,10 @@
>  #define SRC_CDREX		0x20200
>  #define DIV_CDREX0		0x20500
>  #define DIV_CDREX1		0x20504
> +#define GATE_BUS_CDREX0		0x20700
> +#define GATE_BUS_CDREX1		0x20704
> +#define CDREX_PAUSE		0x2091c
> +#define CDREX_LPDDR3PHY_CON3	0x20a20
>  #define KPLL_LOCK		0x28000
>  #define KPLL_CON0		0x28100
>  #define SRC_KFC			0x28200
> @@ -248,6 +252,10 @@ static const unsigned long exynos5x_clk_regs[] __initconst = {
>  	DIV_CDREX1,
>  	SRC_KFC,
>  	DIV_KFC0,
> +	GATE_BUS_CDREX0,
> +	GATE_BUS_CDREX1,
> +	CDREX_PAUSE,
> +	CDREX_LPDDR3PHY_CON3,
>  };
>  
>  static const unsigned long exynos5800_clk_regs[] __initconst = {
> @@ -425,6 +433,9 @@ PNAME(mout_group13_5800_p)	= { "dout_osc_div", "mout_sw_aclkfl1_550_cam" };
>  PNAME(mout_group14_5800_p)	= { "dout_aclk550_cam", "dout_sclk_sw" };
>  PNAME(mout_group15_5800_p)	= { "dout_osc_div", "mout_sw_aclk550_cam" };
>  PNAME(mout_group16_5800_p)	= { "dout_osc_div", "mout_mau_epll_clk" };
> +PNAME(mout_mx_mspll_ccore_phy_p) = { "sclk_bpll", "mout_sclk_dpll",
> +					"mout_sclk_mpll", "ff_dout_spll2",
> +					"mout_sclk_spll", "mout_sclk_epll"};
>  
>  /* fixed rate clocks generated outside the soc */
>  static struct samsung_fixed_rate_clock
> @@ -450,7 +461,7 @@ static const struct samsung_fixed_factor_clock
>  static const struct samsung_fixed_factor_clock
>  		exynos5800_fixed_factor_clks[] __initconst = {
>  	FFACTOR(0, "ff_dout_epll2", "mout_sclk_epll", 1, 2, 0),
> -	FFACTOR(0, "ff_dout_spll2", "mout_sclk_spll", 1, 2, 0),
> +	FFACTOR(CLK_FF_DOUT_SPLL2, "ff_dout_spll2", "mout_sclk_spll", 1, 2, 0),
>  };
>  
>  static const struct samsung_mux_clock exynos5800_mux_clks[] __initconst = {
> @@ -472,11 +483,14 @@ static const struct samsung_mux_clock exynos5800_mux_clks[] __initconst = {
>  	MUX(0, "mout_aclk300_disp1", mout_group5_5800_p, SRC_TOP2, 24, 2),
>  	MUX(0, "mout_aclk300_gscl", mout_group5_5800_p, SRC_TOP2, 28, 2),
>  
> +	MUX(CLK_MOUT_MX_MSPLL_CCORE_PHY, "mout_mx_mspll_ccore_phy",
> +		mout_mx_mspll_ccore_phy_p, SRC_TOP7, 0, 3),
> +
>  	MUX(CLK_MOUT_MX_MSPLL_CCORE, "mout_mx_mspll_ccore",
> -			mout_mx_mspll_ccore_p, SRC_TOP7, 16, 2),
> +			mout_mx_mspll_ccore_p, SRC_TOP7, 16, 3),
>  	MUX_F(CLK_MOUT_MAU_EPLL, "mout_mau_epll_clk", mout_mau_epll_clk_5800_p,
>  			SRC_TOP7, 20, 2, CLK_SET_RATE_PARENT, 0),
> -	MUX(0, "sclk_bpll", mout_bpll_p, SRC_TOP7, 24, 1),
> +	MUX(CLK_SCLK_BPLL, "sclk_bpll", mout_bpll_p, SRC_TOP7, 24, 1),
>  	MUX(0, "mout_epll2", mout_epll2_5800_p, SRC_TOP7, 28, 1),
>  
>  	MUX(0, "mout_aclk550_cam", mout_group3_5800_p, SRC_TOP8, 16, 3),
> @@ -648,7 +662,7 @@ static const struct samsung_mux_clock exynos5x_mux_clks[] __initconst = {
>  
>  	MUX(0, "mout_sclk_mpll", mout_mpll_p, SRC_TOP6, 0, 1),
>  	MUX(CLK_MOUT_VPLL, "mout_sclk_vpll", mout_vpll_p, SRC_TOP6, 4, 1),
> -	MUX(0, "mout_sclk_spll", mout_spll_p, SRC_TOP6, 8, 1),
> +	MUX(CLK_MOUT_SCLK_SPLL, "mout_sclk_spll", mout_spll_p, SRC_TOP6, 8, 1),
>  	MUX(0, "mout_sclk_ipll", mout_ipll_p, SRC_TOP6, 12, 1),
>  	MUX(0, "mout_sclk_rpll", mout_rpll_p, SRC_TOP6, 16, 1),
>  	MUX_F(CLK_MOUT_EPLL, "mout_sclk_epll", mout_epll_p, SRC_TOP6, 20, 1,
> @@ -817,6 +831,8 @@ static const struct samsung_div_clock exynos5x_div_clks[] __initconst = {
>  	DIV(CLK_DOUT_CLK2X_PHY0, "dout_clk2x_phy0", "dout_sclk_cdrex",
>  			DIV_CDREX0, 3, 5),
>  
> +	DIV(0, "dout_pclk_drex0", "dout_cclk_drex0", DIV_CDREX0, 28, 3),
> +
>  	DIV(CLK_DOUT_PCLK_CORE_MEM, "dout_pclk_core_mem", "mout_mclk_cdrex",
>  			DIV_CDREX1, 8, 3),
>  
> @@ -1170,6 +1186,36 @@ static const struct samsung_gate_clock exynos5x_gate_clks[] __initconst = {
>  			GATE_TOP_SCLK_ISP, 12, CLK_SET_RATE_PARENT, 0),
>  
>  	GATE(CLK_G3D, "g3d", "mout_user_aclk_g3d", GATE_IP_G3D, 9, 0, 0),
> +
> +	/* CDREX */
> +	GATE(CLK_CLKM_PHY0, "clkm_phy0", "dout_sclk_cdrex",
> +			GATE_BUS_CDREX0, 0, 0, 0),
> +	GATE(CLK_CLKM_PHY1, "clkm_phy1", "dout_sclk_cdrex",
> +			GATE_BUS_CDREX0, 1, 0, 0),

nitpick. Add the blank line because of clocks of the different register.

> +	GATE(0, "mx_mspll_ccore_phy", "mout_mx_mspll_ccore_phy",
> +			SRC_MASK_TOP7, 0, CLK_IGNORE_UNUSED, 0),
> +
> +	GATE(CLK_ACLK_PPMU_DREX1_1, "aclk_ppmu_drex1_1", "dout_aclk_cdrex1",
> +			GATE_BUS_CDREX1, 12, CLK_IGNORE_UNUSED, 0),
> +	GATE(CLK_ACLK_PPMU_DREX1_0, "aclk_ppmu_drex1_0", "dout_aclk_cdrex1",
> +			GATE_BUS_CDREX1, 13, CLK_IGNORE_UNUSED, 0),
> +	GATE(CLK_ACLK_PPMU_DREX0_1, "aclk_ppmu_drex0_1", "dout_aclk_cdrex1",
> +			GATE_BUS_CDREX1, 14, CLK_IGNORE_UNUSED, 0),
> +	GATE(CLK_ACLK_PPMU_DREX0_0, "aclk_ppmu_drex0_0", "dout_aclk_cdrex1",
> +			GATE_BUS_CDREX1, 15, CLK_IGNORE_UNUSED, 0),
> +
> +	GATE(CLK_PCLK_PPMU_DREX1_1, "pclk_ppmu_drex1_1", "dout_pclk_cdrex",
> +			GATE_BUS_CDREX1, 26, CLK_IGNORE_UNUSED, 0),
> +	GATE(CLK_PCLK_PPMU_DREX1_0, "pclk_ppmu_drex1_0", "dout_pclk_cdrex",
> +			GATE_BUS_CDREX1, 27, CLK_IGNORE_UNUSED, 0),
> +	GATE(CLK_PCLK_PPMU_DREX0_1, "pclk_ppmu_drex0_1", "dout_pclk_cdrex",
> +			GATE_BUS_CDREX1, 28, CLK_IGNORE_UNUSED, 0),
> +	GATE(CLK_PCLK_PPMU_DREX0_0, "pclk_ppmu_drex0_0", "dout_pclk_cdrex",
> +			GATE_BUS_CDREX1, 29, CLK_IGNORE_UNUSED, 0),
> +
> +	GATE(CLK_CDREX_PAUSE, "clk_cdrex_pause", NULL, CDREX_PAUSE, 0, 0, 0),

nitpick. Add the blank line because of clocks of the different register.

> +	GATE(CLK_CDREX_TIMING_SET, "clk_cdrex_timing_set", NULL,
> +			CDREX_LPDDR3PHY_CON3, 28, 0, 0),
>  };
>  
>  static const struct samsung_div_clock exynos5x_disp_div_clks[] __initconst = {
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics