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Message-ID:
<OSBPR01MB2775133AA5EFB19B4797BF86FF3C2@OSBPR01MB2775.jpnprd01.prod.outlook.com>
Date: Mon, 9 Dec 2024 11:30:54 +0000
From: John Madieu <john.madieu.xa@...renesas.com>
To: Claudiu.Beznea <claudiu.beznea@...on.dev>, Geert Uytterhoeven
<geert+renesas@...der.be>, Magnus Damm <magnus.damm@...il.com>, Rob Herring
<robh@...nel.org>, Biju Das <biju.das.jz@...renesas.com>, Krzysztof Kozlowski
<krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Claudiu Beznea
<claudiu.beznea.uj@...renesas.com>
CC: "john.madieu@...il.com" <john.madieu@...il.com>,
"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH 3/5] soc: renesas: rz-sysc: Add support for RZ/G3E family
> -----Original Message-----
> From: Claudiu Beznea <claudiu.beznea@...on.dev>
> Sent: Saturday, December 7, 2024 11:22 AM
> To: John Madieu <john.madieu.xa@...renesas.com>; Geert Uytterhoeven
> <geert+renesas@...der.be>; Magnus Damm <magnus.damm@...il.com>; Rob
> Herring <robh@...nel.org>; Biju Das <biju.das.jz@...renesas.com>;
> Krzysztof Kozlowski <krzk+dt@...nel.org>; Conor Dooley
> <conor+dt@...nel.org>; Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> Cc: john.madieu@...il.com; linux-renesas-soc@...r.kernel.org; linux-
> kernel@...r.kernel.org; devicetree@...r.kernel.org
> Subject: Re: [PATCH 3/5] soc: renesas: rz-sysc: Add support for RZ/G3E
> family
>
> Hi, John,
Hello Claudiu,
>
> On 06.12.2024 23:25, John Madieu wrote:
> > Add SoC detection support for RZ/G3E SoC. Also add support for
> > detecting the number of cores and ETHOS-U55 NPU and also detect PLL
> > mismatch for SW settings other than 1.7GHz.
> >
> > Signed-off-by: John Madieu <john.madieu.xa@...renesas.com>
> > ---
> > drivers/soc/renesas/Kconfig | 6 +++
> > drivers/soc/renesas/Makefile | 1 +
> > drivers/soc/renesas/r9a09g047-sysc.c | 70 ++++++++++++++++++++++++++++
> > drivers/soc/renesas/rz-sysc.c | 44 +++++++++++------
> > drivers/soc/renesas/rz-sysc.h | 7 +++
> > 5 files changed, 114 insertions(+), 14 deletions(-) create mode
> > 100644 drivers/soc/renesas/r9a09g047-sysc.c
> >
> > diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig
> > index a792a3e915fe..9e46b0ee6e80 100644
> > --- a/drivers/soc/renesas/Kconfig
> > +++ b/drivers/soc/renesas/Kconfig
> > @@ -348,6 +348,7 @@ config ARCH_R9A09G011
> >
> > config ARCH_R9A09G047
> > bool "ARM64 Platform support for RZ/G3E"
> > + select SYSC_R9A09G047
> > help
> > This enables support for the Renesas RZ/G3E SoC variants.
> >
> > @@ -386,9 +387,14 @@ config RST_RCAR
> >
> > config SYSC_RZ
> > bool "System controller for RZ SoCs" if COMPILE_TEST
> > + depends on MFD_SYSCON
> >
> > config SYSC_R9A08G045
> > bool "Renesas RZ/G3S System controller support" if COMPILE_TEST
> > select SYSC_RZ
> >
> > +config SYSC_R9A09G047
> > + bool "Renesas RZ/G3E System controller support" if COMPILE_TEST
> > + select SYSC_RZ
> > +
> > endif # SOC_RENESAS
> > diff --git a/drivers/soc/renesas/Makefile
> > b/drivers/soc/renesas/Makefile index 8cd139b3dd0a..3256706112d9 100644
> > --- a/drivers/soc/renesas/Makefile
> > +++ b/drivers/soc/renesas/Makefile
> > @@ -7,6 +7,7 @@ ifdef CONFIG_SMP
> > obj-$(CONFIG_ARCH_R9A06G032) += r9a06g032-smp.o
> > endif
> > obj-$(CONFIG_SYSC_R9A08G045) += r9a08g045-sysc.o
> > +obj-$(CONFIG_SYSC_R9A09G047) += r9a09g047-sysc.o
> >
> > # Family
> > obj-$(CONFIG_PWC_RZV2M) += pwc-rzv2m.o
> > diff --git a/drivers/soc/renesas/r9a09g047-sysc.c
> > b/drivers/soc/renesas/r9a09g047-sysc.c
> > new file mode 100644
> > index 000000000000..32bdab9f1774
> > --- /dev/null
> > +++ b/drivers/soc/renesas/r9a09g047-sysc.c
> > @@ -0,0 +1,70 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * RZ/G3E System controller driver
> > + *
> > + * Copyright (C) 2024 Renesas Electronics Corp.
> > + */
> > +
> > +#include <linux/bits.h>
> > +#include <linux/device.h>
> > +#include <linux/init.h>
> > +#include <linux/io.h>
> > +
> > +#include "rz-sysc.h"
> > +
> > +/* Register definitions */
> > +#define SYS_LSI_DEVID 0x304
> > +#define SYS_LSI_MODE 0x300
> > +#define SYS_LSI_PRR 0x308
> > +#define SYS_LSI_DEVID_REV GENMASK(31, 28)
> > +#define SYS_LSI_DEVID_SPECIFIC GENMASK(27, 0)
> > +#define SYS_LSI_PRR_CA55_DIS BIT(8)
> > +#define SYS_LSI_PRR_NPU_DIS BIT(1)
> > +/*
> > + * BOOTPLLCA[1:0]
> > + * [0,0] => 1.1GHZ
> > + * [0,1] => 1.5GHZ
> > + * [1,0] => 1.6GHZ
> > + * [1,1] => 1.7GHZ
> > + */
> > +#define SYS_LSI_MODE_STAT_BOOTPLLCA55 GENMASK(12, 11)
> > +#define SYS_LSI_MODE_CA55_1_7GHz 0x3
> > +
> > +static void rzg3e_extended_device_identification(struct device *dev,
> > + void __iomem *sysc_base,
> > + struct soc_device_attribute *soc_dev_attr)
>
> Not strong preference here, I think it can still be aligned to (
Noted. Thanks!
>
> > +{
> > + u32 prr_val, mode_val;
> > + bool is_quad_core, npu_enabled;
>
> Reverse christmass tree order?
Will swap it in v2.
>
> > +
> > + prr_val = readl(sysc_base + SYS_LSI_PRR);
> > + mode_val = readl(sysc_base + SYS_LSI_MODE);
> > +
> > + /* Check CPU and NPU configuration */
> > + is_quad_core = !(prr_val & SYS_LSI_PRR_CA55_DIS);
> > + npu_enabled = !(prr_val & SYS_LSI_PRR_NPU_DIS);
> > +
> > + dev_info(dev, "Detected Renesas %s Core %s %s Rev %s %s\n",
>
> I think you have an extra space towards the end: "%s %s"
Thanks for pointing it out.
>
> > + is_quad_core ? "Quad" : "Dual",
> > + soc_dev_attr->family,
> > + soc_dev_attr->soc_id,
> > + soc_dev_attr->revision,
> > + npu_enabled ? "with Ethos-U55" : "");
> > +
> > + /* Check CA55 PLL configuration */
> > + if (FIELD_GET(SYS_LSI_MODE_STAT_BOOTPLLCA55, mode_val) !=
> SYS_LSI_MODE_CA55_1_7GHz)
> > + dev_warn(dev, "CA55 PLL is not set to 1.7GHz\n"); }
> > +
> > +static const struct rz_sysc_soc_id_init_data
> rzg3e_sysc_soc_id_init_data __initconst = {
> > + .family = "RZ/G3E",
> > + .id = 0x8679447,
> > + .offset = SYS_LSI_DEVID,
> > + .revision_mask = SYS_LSI_DEVID_REV,
> > + .specific_id_mask = SYS_LSI_DEVID_SPECIFIC,
> > + .extended_device_identification =
> > +rzg3e_extended_device_identification,
> > +};
> > +
> > +const struct rz_sysc_init_data rzg3e_sysc_init_data = {
> > + .soc_id_init_data = &rzg3e_sysc_soc_id_init_data, };
> > diff --git a/drivers/soc/renesas/rz-sysc.c
> > b/drivers/soc/renesas/rz-sysc.c index d34d295831b8..515eca249b6e
> > 100644
> > --- a/drivers/soc/renesas/rz-sysc.c
> > +++ b/drivers/soc/renesas/rz-sysc.c
> > @@ -231,7 +231,7 @@ static int rz_sysc_soc_init(struct rz_sysc *sysc,
> > const struct of_device_id *mat
> >
> > soc_id_start = strchr(match->compatible, ',') + 1;
> > soc_id_end = strchr(match->compatible, '-');
> > - size = soc_id_end - soc_id_start;
> > + size = soc_id_end - soc_id_start + 1;
>
> This may worth a different patch.
Got it.
>
> > if (size > 32)
> > size = 32;
> > strscpy(soc_id, soc_id_start, size); @@ -257,8 +257,16 @@ static int
> > rz_sysc_soc_init(struct rz_sysc *sysc, const struct of_device_id *mat
> > return -ENODEV;
> > }
> >
> > - dev_info(sysc->dev, "Detected Renesas %s %s Rev %s\n", soc_dev_attr-
> >family,
> > - soc_dev_attr->soc_id, soc_dev_attr->revision);
> > + /* Try to call SoC-specific device identification */
> > + if (soc_data->extended_device_identification) {
> > + soc_data->extended_device_identification(sysc->dev, sysc-
> >base,
> > + soc_dev_attr);
> > + } else {
> > + dev_info(sysc->dev, "Detected Renesas %s %s Rev %s\n",
> > + soc_dev_attr->family,
> > + soc_dev_attr->soc_id,
> > + soc_dev_attr->revision);
> > + }
> >
> > soc_dev = soc_device_register(soc_dev_attr);
> > if (IS_ERR(soc_dev))
> > @@ -283,6 +291,9 @@ static struct regmap_config rz_sysc_regmap = {
> > static const struct of_device_id rz_sysc_match[] = { #ifdef
> > CONFIG_SYSC_R9A08G045
> > { .compatible = "renesas,r9a08g045-sysc", .data =
> > &rzg3s_sysc_init_data },
> > +#endif
> > +#ifdef CONFIG_SYSC_R9A09G047
> > + { .compatible = "renesas,r9a09g047-sys", .data =
> > +&rzg3e_sysc_init_data },
> > #endif
> > { }
> > };
> > @@ -315,20 +326,25 @@ static int rz_sysc_probe(struct platform_device
> *pdev)
> > return ret;
> >
> > data = match->data;
> > - if (!data->max_register_offset)
> > - return -EINVAL;
>
> The idea with this was to still have the syscon regmap registered no
> matter the signals are available or not. This may be needed for other use
> cases.
>
> > + if (data->signals_init_data) {
>
> I'd prefer to have this check in rz_sysc_signals_init(). In this way you
> have everything signal init specific in a single function.
The idea here is to avoid calling rz_sysc_signals_init() for drivers that
don't need it instead of always calling it, and potentially dealing with
errors due to drivers not supporting it, instead of the function actually
failing.
>
> > + if (!data->max_register_offset)
> > + return -EINVAL;
> >
> > - ret = rz_sysc_signals_init(sysc, data->signals_init_data, data-
> >num_signals);
> > - if (ret)
> > - return ret;
> > + ret = rz_sysc_signals_init(sysc, data->signals_init_data,
> data->num_signals);
> > + if (ret)
> > + return ret;
> > +
> > + rz_sysc_regmap.max_register = data->max_register_offset;
> > + dev_set_drvdata(dev, sysc);
>
> Why changed the initial order?
No special reason. Will be reverted.
>
> Thank you,
> Claudiu
Thanks!
>
> >
> > - dev_set_drvdata(dev, sysc);
> > - rz_sysc_regmap.max_register = data->max_register_offset;
> > - regmap = devm_regmap_init(dev, NULL, sysc, &rz_sysc_regmap);
> > - if (IS_ERR(regmap))
> > - return PTR_ERR(regmap);
> > + regmap = devm_regmap_init(dev, NULL, sysc, &rz_sysc_regmap);
> > + if (IS_ERR(regmap))
> > + return PTR_ERR(regmap);
> >
> > - return of_syscon_register_regmap(dev->of_node, regmap);
> > + return of_syscon_register_regmap(dev->of_node, regmap);
> > + }
> > +
> > + return 0;
> > }
> >
> > static struct platform_driver rz_sysc_driver = { diff --git
> > a/drivers/soc/renesas/rz-sysc.h b/drivers/soc/renesas/rz-sysc.h index
> > babca9c743c7..2b5ad41cef9e 100644
> > --- a/drivers/soc/renesas/rz-sysc.h
> > +++ b/drivers/soc/renesas/rz-sysc.h
> > @@ -8,7 +8,9 @@
> > #ifndef __SOC_RENESAS_RZ_SYSC_H__
> > #define __SOC_RENESAS_RZ_SYSC_H__
> >
> > +#include <linux/device.h>
> > #include <linux/refcount.h>
> > +#include <linux/sys_soc.h>
> > #include <linux/types.h>
> >
> > /**
> > @@ -42,6 +44,7 @@ struct rz_sysc_signal {
> > * @offset: SYSC SoC ID register offset
> > * @revision_mask: SYSC SoC ID revision mask
> > * @specific_id_mask: SYSC SoC ID specific ID mask
> > + * @extended_device_identification: SoC-specific extended device
> > + identification
> > */
> > struct rz_sysc_soc_id_init_data {
> > const char * const family;
> > @@ -49,6 +52,9 @@ struct rz_sysc_soc_id_init_data {
> > u32 offset;
> > u32 revision_mask;
> > u32 specific_id_mask;
> > + void (*extended_device_identification)(struct device *dev,
> > + void __iomem *sysc_base,
> > + struct soc_device_attribute *soc_dev_attr);
> > };
> >
> > /**
> > @@ -65,6 +71,7 @@ struct rz_sysc_init_data {
> > u32 max_register_offset;
> > };
> >
> > +extern const struct rz_sysc_init_data rzg3e_sysc_init_data;
> > extern const struct rz_sysc_init_data rzg3s_sysc_init_data;
> >
> > #endif /* __SOC_RENESAS_RZ_SYSC_H__ */
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