Hi Marco,
On Mon, Nov 14, 2022 at 9:34 AM Marco Felsch <m.felsch@xxxxxxxxxxxxxx> wrote:
>
> Hi Dario,
>
> On 22-11-13, Dario Binacchi wrote:
> > There is no occurrence of vpu pll in the reference manual (document
> > IMX8MNRM Rev 2, 07/2022). From an analysis of the code and the RM
> > itself, I think vpu pll is used instead of m7 alternate pll, probably
> > for copy and paste of code taken from modules of similar architectures.
> >
> > As an example for all, if we consider the second row of the "Clock Root"
> > table of chapter 5 (Clocks and Power Management) of the RM:
> >
> > Clock Root offset Source Select (CCM_TARGET_ROOTn[MUX])
> > ... ... ...
> > ARM_M7_CLK_ROOT 0x8080 000 - 24M_REF_CLK
> > 001 - SYSTEM_PLL2_DIV5
> > 010 - SYSTEM_PLL2_DIV4
> > 011 - M7_ALT_PLL_CLK
> > 100 - SYSTEM_PLL1_CLK
> > 101 - AUDIO_PLL1_CLK
> > 110 - VIDEO_PLL_CLK
> > 111 - SYSTEM_PLL3_CLK
> > ... ... ...
> >
> > but in the source code, the imx8mn_m7_sels clocks list contains vpu_pll
> > for the source select bits 011b.
>
> Thanks for the real detailed description. Maybe we should mention, that
> the 8MN has no VPU complex at all.
>
> > So, let's rename "vpu_pll" to "m7_alt_pll" to be consistent with the RM.
> >
> > No functional changes intended.
> >
> > Signed-off-by: Dario Binacchi <dario.binacchi@xxxxxxxxxxxxxxxxxxxx>
> > ---
> >
> > drivers/clk/imx/clk-imx8mn.c | 16 ++++++++--------
> > include/dt-bindings/clock/imx8mn-clock.h | 8 ++++----
> > 2 files changed, 12 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/clk/imx/clk-imx8mn.c b/drivers/clk/imx/clk-imx8mn.c
> > index d37c45b676ab..72f9563a0ff6 100644
> > --- a/drivers/clk/imx/clk-imx8mn.c
> > +++ b/drivers/clk/imx/clk-imx8mn.c
> > @@ -30,7 +30,7 @@ static const char * const audio_pll2_bypass_sels[] = {"audio_pll2", "audio_pll2_
> > static const char * const video_pll1_bypass_sels[] = {"video_pll1", "video_pll1_ref_sel", };
> > static const char * const dram_pll_bypass_sels[] = {"dram_pll", "dram_pll_ref_sel", };
> > static const char * const gpu_pll_bypass_sels[] = {"gpu_pll", "gpu_pll_ref_sel", };
> > -static const char * const vpu_pll_bypass_sels[] = {"vpu_pll", "vpu_pll_ref_sel", };
> > +static const char * const m7_alt_pll_bypass_sels[] = {"m7_alt_pll", "m7_alt_pll_ref_sel", };
> > static const char * const arm_pll_bypass_sels[] = {"arm_pll", "arm_pll_ref_sel", };
> > static const char * const sys_pll3_bypass_sels[] = {"sys_pll3", "sys_pll3_ref_sel", };
> >
> > @@ -40,7 +40,7 @@ static const char * const imx8mn_a53_sels[] = {"osc_24m", "arm_pll_out", "sys_pl
> >
> > static const char * const imx8mn_a53_core_sels[] = {"arm_a53_div", "arm_pll_out", };
> >
> > -static const char * const imx8mn_m7_sels[] = {"osc_24m", "sys_pll2_200m", "sys_pll2_250m", "vpu_pll_out",
> > +static const char * const imx8mn_m7_sels[] = {"osc_24m", "sys_pll2_200m", "sys_pll2_250m", "m7_alt_pll_out",
> > "sys_pll1_800m", "audio_pll1_out", "video_pll1_out", "sys_pll3_out", };
> >
> > static const char * const imx8mn_gpu_core_sels[] = {"osc_24m", "gpu_pll_out", "sys_pll1_800m",
> > @@ -252,10 +252,10 @@ static const char * const imx8mn_gpt6_sels[] = {"osc_24m", "sys_pll2_100m", "sys
> > "audio_pll1_out", "clk_ext1", };
> >
> > static const char * const imx8mn_wdog_sels[] = {"osc_24m", "sys_pll1_133m", "sys_pll1_160m",
> > - "vpu_pll_out", "sys_pll2_125m", "sys_pll3_out",
> > + "m7_alt_pll_out", "sys_pll2_125m", "sys_pll3_out",
> > "sys_pll1_80m", "sys_pll2_166m", };
> >
> > -static const char * const imx8mn_wrclk_sels[] = {"osc_24m", "sys_pll1_40m", "vpu_pll_out",
> > +static const char * const imx8mn_wrclk_sels[] = {"osc_24m", "sys_pll1_40m", "m7_alt_pll_out",
> > "sys_pll3_out", "sys_pll2_200m", "sys_pll1_266m",
> > "sys_pll2_500m", "sys_pll1_100m", };
> >
> > @@ -352,7 +352,7 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
> > hws[IMX8MN_VIDEO_PLL1_REF_SEL] = imx_clk_hw_mux("video_pll1_ref_sel", base + 0x28, 0, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels));
> > hws[IMX8MN_DRAM_PLL_REF_SEL] = imx_clk_hw_mux("dram_pll_ref_sel", base + 0x50, 0, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels));
> > hws[IMX8MN_GPU_PLL_REF_SEL] = imx_clk_hw_mux("gpu_pll_ref_sel", base + 0x64, 0, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels));
> > - hws[IMX8MN_VPU_PLL_REF_SEL] = imx_clk_hw_mux("vpu_pll_ref_sel", base + 0x74, 0, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels));
> > + hws[IMX8MN_M7_ALT_PLL_REF_SEL] = imx_clk_hw_mux("m7_alt_pll_ref_sel", base + 0x74, 0, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels));
> > hws[IMX8MN_ARM_PLL_REF_SEL] = imx_clk_hw_mux("arm_pll_ref_sel", base + 0x84, 0, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels));
> > hws[IMX8MN_SYS_PLL3_REF_SEL] = imx_clk_hw_mux("sys_pll3_ref_sel", base + 0x114, 0, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels));
> >
> > @@ -361,7 +361,7 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
> > hws[IMX8MN_VIDEO_PLL1] = imx_clk_hw_pll14xx("video_pll1", "video_pll1_ref_sel", base + 0x28, &imx_1443x_pll);
> > hws[IMX8MN_DRAM_PLL] = imx_clk_hw_pll14xx("dram_pll", "dram_pll_ref_sel", base + 0x50, &imx_1443x_dram_pll);
> > hws[IMX8MN_GPU_PLL] = imx_clk_hw_pll14xx("gpu_pll", "gpu_pll_ref_sel", base + 0x64, &imx_1416x_pll);
> > - hws[IMX8MN_VPU_PLL] = imx_clk_hw_pll14xx("vpu_pll", "vpu_pll_ref_sel", base + 0x74, &imx_1416x_pll);
> > + hws[IMX8MN_M7_ALT_PLL] = imx_clk_hw_pll14xx("m7_alt_pll", "m7_alt_pll_ref_sel", base + 0x74, &imx_1416x_pll);
> > hws[IMX8MN_ARM_PLL] = imx_clk_hw_pll14xx("arm_pll", "arm_pll_ref_sel", base + 0x84, &imx_1416x_pll);
> > hws[IMX8MN_SYS_PLL1] = imx_clk_hw_fixed("sys_pll1", 800000000);
> > hws[IMX8MN_SYS_PLL2] = imx_clk_hw_fixed("sys_pll2", 1000000000);
> > @@ -373,7 +373,7 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
> > hws[IMX8MN_VIDEO_PLL1_BYPASS] = imx_clk_hw_mux_flags("video_pll1_bypass", base + 0x28, 16, 1, video_pll1_bypass_sels, ARRAY_SIZE(video_pll1_bypass_sels), CLK_SET_RATE_PARENT);
> > hws[IMX8MN_DRAM_PLL_BYPASS] = imx_clk_hw_mux_flags("dram_pll_bypass", base + 0x50, 16, 1, dram_pll_bypass_sels, ARRAY_SIZE(dram_pll_bypass_sels), CLK_SET_RATE_PARENT);
> > hws[IMX8MN_GPU_PLL_BYPASS] = imx_clk_hw_mux_flags("gpu_pll_bypass", base + 0x64, 28, 1, gpu_pll_bypass_sels, ARRAY_SIZE(gpu_pll_bypass_sels), CLK_SET_RATE_PARENT);
> > - hws[IMX8MN_VPU_PLL_BYPASS] = imx_clk_hw_mux_flags("vpu_pll_bypass", base + 0x74, 28, 1, vpu_pll_bypass_sels, ARRAY_SIZE(vpu_pll_bypass_sels), CLK_SET_RATE_PARENT);
> > + hws[IMX8MN_M7_ALT_PLL_BYPASS] = imx_clk_hw_mux_flags("m7_alt_pll_bypass", base + 0x74, 28, 1, m7_alt_pll_bypass_sels, ARRAY_SIZE(m7_alt_pll_bypass_sels), CLK_SET_RATE_PARENT);
> > hws[IMX8MN_ARM_PLL_BYPASS] = imx_clk_hw_mux_flags("arm_pll_bypass", base + 0x84, 28, 1, arm_pll_bypass_sels, ARRAY_SIZE(arm_pll_bypass_sels), CLK_SET_RATE_PARENT);
> > hws[IMX8MN_SYS_PLL3_BYPASS] = imx_clk_hw_mux_flags("sys_pll3_bypass", base + 0x114, 28, 1, sys_pll3_bypass_sels, ARRAY_SIZE(sys_pll3_bypass_sels), CLK_SET_RATE_PARENT);
> >
> > @@ -383,7 +383,7 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
> > hws[IMX8MN_VIDEO_PLL1_OUT] = imx_clk_hw_gate("video_pll1_out", "video_pll1_bypass", base + 0x28, 13);
> > hws[IMX8MN_DRAM_PLL_OUT] = imx_clk_hw_gate("dram_pll_out", "dram_pll_bypass", base + 0x50, 13);
> > hws[IMX8MN_GPU_PLL_OUT] = imx_clk_hw_gate("gpu_pll_out", "gpu_pll_bypass", base + 0x64, 11);
> > - hws[IMX8MN_VPU_PLL_OUT] = imx_clk_hw_gate("vpu_pll_out", "vpu_pll_bypass", base + 0x74, 11);
> > + hws[IMX8MN_M7_ALT_PLL_OUT] = imx_clk_hw_gate("m7_alt_pll_out", "m7_alt_pll_bypass", base + 0x74, 11);
> > hws[IMX8MN_ARM_PLL_OUT] = imx_clk_hw_gate("arm_pll_out", "arm_pll_bypass", base + 0x84, 11);
> > hws[IMX8MN_SYS_PLL3_OUT] = imx_clk_hw_gate("sys_pll3_out", "sys_pll3_bypass", base + 0x114, 11);
>
> The driver changes looking good from my pov.
>
> > diff --git a/include/dt-bindings/clock/imx8mn-clock.h b/include/dt-bindings/clock/imx8mn-clock.h
> > index 07b8a282c268..f103b008a12a 100644
> > --- a/include/dt-bindings/clock/imx8mn-clock.h
> > +++ b/include/dt-bindings/clock/imx8mn-clock.h
> > @@ -19,7 +19,7 @@
> > #define IMX8MN_VIDEO_PLL1_REF_SEL 10
> > #define IMX8MN_DRAM_PLL_REF_SEL 11
> > #define IMX8MN_GPU_PLL_REF_SEL 12
> > -#define IMX8MN_VPU_PLL_REF_SEL 13
> > +#define IMX8MN_M7_ALT_PLL_REF_SEL 13
>
> If we take backward compatibility serious we can't do that since this
> may break existing device trees. What you can do is:
>
> #define IMX8MN_M7_ALT_PLL_REF_SEL 13
> #define IMX8MN_VPU_PLL_REF_SEL IMX8MN_M7_ALT_PLL_REF_SEL
>
> and add a comment that we need this for backward compatibility. Same
> applies for the below defines.
If I run the command "git grep IMX8MN_VPU_PLL", this is the output:
drivers/clk/imx/clk-imx8mn.c: hws[IMX8MN_VPU_PLL_REF_SEL] =
imx_clk_hw_mux("vpu_pll_ref_sel", base + 0x74, 0, 2, pll_ref_sels,
ARRAY_SIZE(pll_ref_sels));
drivers/clk/imx/clk-imx8mn.c: hws[IMX8MN_VPU_PLL] =
imx_clk_hw_pll14xx("vpu_pll", "vpu_pll_ref_sel", base + 0x74,
&imx_1416x_pll);
drivers/clk/imx/clk-imx8mn.c: hws[IMX8MN_VPU_PLL_BYPASS] =
imx_clk_hw_mux_flags("vpu_pll_bypass", base + 0x74, 28, 1,
vpu_pll_bypass_sels, ARRAY_SIZE(vpu_pll_bypass_sels),
CLK_SET_RATE_PARENT);
drivers/clk/imx/clk-imx8mn.c: hws[IMX8MN_VPU_PLL_OUT] =
imx_clk_hw_gate("vpu_pll_out", "vpu_pll_bypass", base + 0x74, 11);
include/dt-bindings/clock/imx8mn-clock.h:#define
IMX8MN_VPU_PLL_REF_SEL 13
include/dt-bindings/clock/imx8mn-clock.h:#define IMX8MN_VPU_PLL
23
include/dt-bindings/clock/imx8mn-clock.h:#define IMX8MN_VPU_PLL_BYPASS
33
include/dt-bindings/clock/imx8mn-clock.h:#define IMX8MN_VPU_PLL_OUT
43
No device tree comes out.
So can we say that backwards compatibility is guaranteed or am I
missing something ?
Thanks and regards,
Dario
>
> Regards,
> Marco
>
> > #define IMX8MN_ARM_PLL_REF_SEL 14
> > #define IMX8MN_SYS_PLL1_REF_SEL 15
> > #define IMX8MN_SYS_PLL2_REF_SEL 16
> > @@ -29,7 +29,7 @@
> > #define IMX8MN_VIDEO_PLL1 20
> > #define IMX8MN_DRAM_PLL 21
> > #define IMX8MN_GPU_PLL 22
> > -#define IMX8MN_VPU_PLL 23
> > +#define IMX8MN_M7_ALT_PLL 23
> > #define IMX8MN_ARM_PLL 24
> > #define IMX8MN_SYS_PLL1 25
> > #define IMX8MN_SYS_PLL2 26
> > @@ -39,7 +39,7 @@
> > #define IMX8MN_VIDEO_PLL1_BYPASS 30
> > #define IMX8MN_DRAM_PLL_BYPASS 31
> > #define IMX8MN_GPU_PLL_BYPASS 32
> > -#define IMX8MN_VPU_PLL_BYPASS 33
> > +#define IMX8MN_M7_ALT_PLL_BYPASS 33
> > #define IMX8MN_ARM_PLL_BYPASS 34
> > #define IMX8MN_SYS_PLL1_BYPASS 35
> > #define IMX8MN_SYS_PLL2_BYPASS 36
> > @@ -49,7 +49,7 @@
> > #define IMX8MN_VIDEO_PLL1_OUT 40
> > #define IMX8MN_DRAM_PLL_OUT 41
> > #define IMX8MN_GPU_PLL_OUT 42
> > -#define IMX8MN_VPU_PLL_OUT 43
> > +#define IMX8MN_M7_ALT_PLL_OUT 43
> > #define IMX8MN_ARM_PLL_OUT 44
> > #define IMX8MN_SYS_PLL1_OUT 45
> > #define IMX8MN_SYS_PLL2_OUT 46
> > --
> > 2.32.0
> >
> >
> >
--
Dario Binacchi
Embedded Linux Developer
dario.binacchi@xxxxxxxxxxxxxxxxxxxx
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