[PATCH 01/17] dt-bindings: clock: r9a07g043-cpg: Add power domain IDs
Biju Das
biju.das.jz at bp.renesas.com
Mon Feb 12 00:59:38 PST 2024
Hi Claudiu,
> -----Original Message-----
> From: claudiu beznea <claudiu.beznea at tuxon.dev>
> Sent: Monday, February 12, 2024 8:02 AM
> Subject: Re: [PATCH 01/17] dt-bindings: clock: r9a07g043-cpg: Add power
> domain IDs
>
> Hi, Biju,
>
> On 08.02.2024 21:20, Biju Das wrote:
> >
> >
> >> -----Original Message-----
> >> From: claudiu beznea <claudiu.beznea at tuxon.dev>
> >> Sent: Thursday, February 8, 2024 4:53 PM
> >> To: Biju Das <biju.das.jz at bp.renesas.com>; geert+renesas at glider.be;
> >> mturquette at baylibre.com; sboyd at kernel.org; robh at kernel.org;
> >> krzysztof.kozlowski+dt at linaro.org; conor+dt at kernel.org;
> >> magnus.damm at gmail.com; paul.walmsley at sifive.com; palmer at dabbelt.com;
> >> aou at eecs.berkeley.edu
> >> Cc: linux-renesas-soc at vger.kernel.org; linux-clk at vger.kernel.org;
> >> devicetree at vger.kernel.org; linux-kernel at vger.kernel.org; linux-
> >> riscv at lists.infradead.org; Claudiu Beznea
> >> <claudiu.beznea.uj at bp.renesas.com>
> >> Subject: Re: [PATCH 01/17] dt-bindings: clock: r9a07g043-cpg: Add
> >> power domain IDs
> >>
> >>
> >>
> >> On 08.02.2024 18:28, Biju Das wrote:
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: claudiu beznea <claudiu.beznea at tuxon.dev>
> >>>> Sent: Thursday, February 8, 2024 3:46 PM
> >>>> Subject: Re: [PATCH 01/17] dt-bindings: clock: r9a07g043-cpg: Add
> >>>> power domain IDs
> >>>>
> >>>> Hi, Biju,
> >>>>
> >>>> On 08.02.2024 16:30, Biju Das wrote:
> >>>>> Hi Claudiu,
> >>>>>
> >>>>> Thanks for the patch.
> >>>>>
> >>>>>> -----Original Message-----
> >>>>>> From: Claudiu <claudiu.beznea at tuxon.dev>
> >>>>>> Sent: Thursday, February 8, 2024 12:43 PM
> >>>>>> Subject: [PATCH 01/17] dt-bindings: clock: r9a07g043-cpg: Add
> >>>>>> power domain IDs
> >>>>>>
> >>>>>> From: Claudiu Beznea <claudiu.beznea.uj at bp.renesas.com>
> >>>>>>
> >>>>>> Add power domain IDs for RZ/G2UL (R9A07G043) SoC.
> >>>>>>
> >>>>>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj at bp.renesas.com>
> >>>>>> ---
> >>>>>> include/dt-bindings/clock/r9a07g043-cpg.h | 48
> >>>>>> +++++++++++++++++++++++
> >>>>>> 1 file changed, 48 insertions(+)
> >>>>>>
> >>>>>> diff --git a/include/dt-bindings/clock/r9a07g043-cpg.h
> >>>>>> b/include/dt- bindings/clock/r9a07g043-cpg.h index
> >>>>>> 77cde8effdc7..eabfeec7ac37
> >>>>>> 100644
> >>>>>> --- a/include/dt-bindings/clock/r9a07g043-cpg.h
> >>>>>> +++ b/include/dt-bindings/clock/r9a07g043-cpg.h
> >>>>>> @@ -200,5 +200,53 @@
> >>>>>> #define R9A07G043_AX45MP_CORE0_RESETN 78 /* RZ/Five Only */
> >>>>>> #define R9A07G043_IAX45_RESETN 79 /* RZ/Five Only */
> >>>>>>
> >>>>>> +/* Power domain IDs. */
> >>>>>> +#define R9A07G043_PD_ALWAYS_ON 0
> >>>>>> +#define R9A07G043_PD_GIC 1
> >>>>>> +#define R9A07G043_PD_IA55 2
> >>>>>> +#define R9A07G043_PD_MHU 3
> >>>>>> +#define R9A07G043_PD_CORESIGHT 4
> >>>>>> +#define R9A07G043_PD_SYC 5
> >>>>>> +#define R9A07G043_PD_DMAC 6
> >>>>>> +#define R9A07G043_PD_GTM0 7
> >>>>>> +#define R9A07G043_PD_GTM1 8
> >>>>>> +#define R9A07G043_PD_GTM2 9
> >>>>>> +#define R9A07G043_PD_MTU 10
> >>>>>> +#define R9A07G043_PD_POE3 11
> >>>>>> +#define R9A07G043_PD_WDT0 12
> >>>>>> +#define R9A07G043_PD_SPI 13
> >>>>>> +#define R9A07G043_PD_SDHI0 14
> >>>>>> +#define R9A07G043_PD_SDHI1 15
> >>>>>> +#define R9A07G043_PD_ISU 16
> >>>>>> +#define R9A07G043_PD_CRU 17
> >>>>>> +#define R9A07G043_PD_LCDC 18
> >>>>>> +#define R9A07G043_PD_SSI0 19
> >>>>>> +#define R9A07G043_PD_SSI1 20
> >>>>>> +#define R9A07G043_PD_SSI2 21
> >>>>>> +#define R9A07G043_PD_SSI3 22
> >>>>>> +#define R9A07G043_PD_SRC 23
> >>>>>> +#define R9A07G043_PD_USB0 24
> >>>>>> +#define R9A07G043_PD_USB1 25
> >>>>>> +#define R9A07G043_PD_USB_PHY 26
> >>>>>> +#define R9A07G043_PD_ETHER0 27
> >>>>>> +#define R9A07G043_PD_ETHER1 28
> >>>>>> +#define R9A07G043_PD_I2C0 29
> >>>>>> +#define R9A07G043_PD_I2C1 30
> >>>>>> +#define R9A07G043_PD_I2C2 31
> >>>>>> +#define R9A07G043_PD_I2C3 32
> >>>>>> +#define R9A07G043_PD_SCIF0 33
> >>>>>> +#define R9A07G043_PD_SCIF1 34
> >>>>>> +#define R9A07G043_PD_SCIF2 35
> >>>>>> +#define R9A07G043_PD_SCIF3 36
> >>>>>> +#define R9A07G043_PD_SCIF4 37
> >>>>>> +#define R9A07G043_PD_SCI0 38
> >>>>>> +#define R9A07G043_PD_SCI1 39
> >>>>>> +#define R9A07G043_PD_IRDA 40
> >>>>>> +#define R9A07G043_PD_RSPI0 41
> >>>>>> +#define R9A07G043_PD_RSPI1 42
> >>>>>> +#define R9A07G043_PD_RSPI2 43
> >>>>>> +#define R9A07G043_PD_CANFD 44
> >>>>>> +#define R9A07G043_PD_ADC 45
> >>>>>> +#define R9A07G043_PD_TSU 46
> >>>>>
> >>>>> Not sure from "Table 42.3 Registers for Module Standby Mode"
> >>>>>
> >>>>> Power domain ID has to be based on CPG_BUS_***_MSTOP or
> >>>>> CPG_CLKON_*** As former reduces number of IDs??
> >>>>
> >>>> If I understand correctly your point here, you want me to describe
> >>>> PM domain in DT with something like:
> >>>>
> >>>> power-domains = <&cpg CPG_BUS_X_MSTOP>;
> >>>
> >>> MSTOP bits are distinct for each IP.
> >>>
> >>> <&cpg CPG_BUS_MCPU1_MSTOP x>; x =1..9
> >>>
> >>> 2=MTU IP
> >>>
> >>> 4= GPT
> >>>
> >>> etc...
> >>>
> >>> Is it something work??
> >>
> >> It might work. But:
> >>
> >> - you have to consider that some IPs have more than one MSTOP bit,
> >> thus, do
> >> we want to uniquely identify these with all MSTOP bits (thus the
> >> 2nd cell
> >> being a bitmask) or only one is enough?
> >
> > We can have an encoding in that case 8:16 24 bit entries
>
> I consider this complicates the bindings. I don't consider this is the way
> going forward. But I may be wrong. I'll let Geert to give his opinion on
> it and change it afterwards, if any.
>
> >
> >> - some HW blocks (e.g. OTFDE_DDR) have no MSTOP bits associated (as of
> my
> >> current research), so, only PWRDN
> >
> > Why do we want to add power domain support for DDR?
>
> To power it up (in case bootloader does any settings in this area) such
> that the system will not block while booting.
DDR is enabled by TF_A and is not touched by linux, so why are we adding
Power domain at all in first place. TZC DDR is not accessible in normal world.
So if you don't add DDR power domains, linux doesn't know about any thing about
and it should work like current case.
>
> It is explained in cover letter:
>
> The current DT
> bindings were updated with module IDs for the modules listed in tables
> with name "Registers for Module Standby Mode" (see HW manual) exception
> being RZ/G3S where, *due to the power down functionality*, the DDR,
> TZCDDR, OTFDE_DDR were also added, to avoid system being blocked due to
> the following lines of code from patch 7/17.
>
> + /* Prepare for power down the BUSes in power down mode. */
> + if (info->pm_domain_pwrdn_mstop)
> + writel(CPG_PWRDN_MSTOP_ENABLE, priv->base +
> + CPG_PWRDN_MSTOP);
>
> >
> >> - some HW blocks have both MSTOP and PWRDN
> >
> > That will be an array right?
>
> I'm not sure what you want to say here.
This has to be an array PM domains(multi PM domain) like clocks?
Or
It can be handled as sibliling power domain like sibling clocks in RZ/G2L Gbether.
Cheers,
Biju
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