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Message-ID: <20221114182202.ejt3ug7vgjuvvkz5@pengutronix.de>
Date: Mon, 14 Nov 2022 19:22:02 +0100
From: Marco Felsch <m.felsch@...gutronix.de>
To: Dario Binacchi <dario.binacchi@...rulasolutions.com>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Stephen Boyd <sboyd@...nel.org>,
linux-amarula@...rulasolutions.com,
Michael Turquette <mturquette@...libre.com>,
linux-clk@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
NXP Linux Team <linux-imx@....com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Shawn Guo <shawnguo@...nel.org>, michael@...rulasolutions.com,
Fabio Estevam <festevam@...il.com>,
Sascha Hauer <s.hauer@...gutronix.de>,
linux-arm-kernel@...ts.infradead.org,
Abel Vesa <abelvesa@...nel.org>
Subject: Re: [PATCH 1/5] clk: imx8mn: rename vpu_pll to m7_alt_pll
Hi Dario,
On 22-11-14, Dario Binacchi wrote:
> Hi Marco,
>
> On Mon, Nov 14, 2022 at 9:34 AM Marco Felsch <m.felsch@...gutronix.de> 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@...rulasolutions.com>
> > > ---
> > >
> > > 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 ?
This depends on the maintainer POV since it is unfortunately quite usual
to not have the DTS files within the kernel repo. Also bootloaders may
use these defines.
Regards,
Marco
> 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@...rulasolutions.com
>
> __________________________________
>
>
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>
> Via Le Canevare 30, 31100 Treviso, Veneto, IT
>
> T. +39 042 243 5310
> info@...rulasolutions.com
>
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>
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