linux-kernel - RE: [PATCH 01/17] dt-bindings: clock: r9a07g043-cpg: Add power domain IDs

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Message-ID:
 <TYCPR01MB112698AB206332D13105C064186442@TYCPR01MB11269.jpnprd01.prod.outlook.com>
Date: Thu, 8 Feb 2024 16:28:15 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Claudiu.Beznea <claudiu.beznea@...on.dev>, "geert+renesas@...der.be"
	<geert+renesas@...der.be>, "mturquette@...libre.com"
	<mturquette@...libre.com>, "sboyd@...nel.org" <sboyd@...nel.org>,
	"robh@...nel.org" <robh@...nel.org>, "krzysztof.kozlowski+dt@...aro.org"
	<krzysztof.kozlowski+dt@...aro.org>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>, "magnus.damm@...il.com" <magnus.damm@...il.com>,
	"paul.walmsley@...ive.com" <paul.walmsley@...ive.com>, "palmer@...belt.com"
	<palmer@...belt.com>, "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>
CC: "linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>, Claudiu
 Beznea <claudiu.beznea.uj@...renesas.com>
Subject: RE: [PATCH 01/17] dt-bindings: clock: r9a07g043-cpg: Add power domain
 IDs



> -----Original Message-----
> From: claudiu beznea <claudiu.beznea@...on.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@...on.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@...renesas.com>
> >>
> >> Add power domain IDs for RZ/G2UL (R9A07G043) SoC.
> >>
> >> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...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??

> 
> where X={ACPU, PERI_CPU, PERI_CPU2, REG0, REG1} ?
> 
> With this, I still see the necessity of a 3rd identifier that will be IP
> specific to be able to uniquely match b/w DT description and registered
> power domain. FMPOV, this will lead to a more complicated implementation.
> 
> We need a unique ID that the pm domain xlate will use to xlate the DT
> binding to driver data structures.

Ok.

Cheers,
Biju