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Message-ID: <20250818162859.9661-2-john.madieu.xa@bp.renesas.com>
Date: Mon, 18 Aug 2025 18:28:47 +0200
From: John Madieu <john.madieu.xa@...renesas.com>
To: geert+renesas@...der.be,
magnus.damm@...il.com,
mturquette@...libre.com,
sboyd@...nel.org,
rafael@...nel.org,
daniel.lezcano@...aro.org,
rui.zhang@...el.com,
lukasz.luba@....com,
robh@...nel.org,
krzk+dt@...nel.org,
conor+dt@...nel.org,
p.zabel@...gutronix.de,
catalin.marinas@....com,
will@...nel.org
Cc: john.madieu@...il.com,
linux-renesas-soc@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org,
devicetree@...r.kernel.org,
biju.das.jz@...renesas.com,
linux-arm-kernel@...ts.infradead.org,
John Madieu <john.madieu.xa@...renesas.com>,
Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH v7 1/6] soc: renesas: rz-sysc: Add syscon/regmap support
The RZ/G3E system controller has various registers that control or report
some properties specific to individual IPs. The regmap is registered as a
syscon device to allow these IP drivers to access the registers through the
regmap API.
As other RZ SoCs might have custom read/write callbacks or max-offsets,
register a custom regmap configuration.
Signed-off-by: John Madieu <john.madieu.xa@...renesas.com>
[claudiu.beznea:
- do not check the match->data validity in rz_sysc_probe() as it is
always valid
- dinamically allocate regmap_cfg]
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---
Changes:
v1 -> v2: no changes
v2 -> v3: no changes
v3 -> v4: no changes
v4 -> v5: no changes
v6: Addressed the review comments received at [1]
v7: As this is a duplicate of [2], address comment received there, that is,
use kzalloc() + kfree() for regmap_cfg.
[1] https://lore.kernel.org/all/20250330214945.185725-2-john.madieu.xa@bp.renesas.com/
[2] https://lore.kernel.org/all/20250808061806.2729274-1-claudiu.beznea.uj@bp.renesas.com/
drivers/soc/renesas/Kconfig | 1 +
drivers/soc/renesas/r9a08g045-sysc.c | 1 +
drivers/soc/renesas/r9a09g047-sys.c | 1 +
drivers/soc/renesas/r9a09g057-sys.c | 1 +
drivers/soc/renesas/rz-sysc.c | 28 +++++++++++++++++++++++++++-
drivers/soc/renesas/rz-sysc.h | 2 ++
6 files changed, 33 insertions(+), 1 deletion(-)
diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig
index 719b7f4f376f..c97e2a183388 100644
--- a/drivers/soc/renesas/Kconfig
+++ b/drivers/soc/renesas/Kconfig
@@ -449,6 +449,7 @@ config RST_RCAR
config SYSC_RZ
bool "System controller for RZ SoCs" if COMPILE_TEST
+ select MFD_SYSCON
config SYSC_R9A08G045
bool "Renesas System controller support for R9A08G045 (RZ/G3S)" if COMPILE_TEST
diff --git a/drivers/soc/renesas/r9a08g045-sysc.c b/drivers/soc/renesas/r9a08g045-sysc.c
index f4db1431e036..0504d4e68761 100644
--- a/drivers/soc/renesas/r9a08g045-sysc.c
+++ b/drivers/soc/renesas/r9a08g045-sysc.c
@@ -20,4 +20,5 @@ static const struct rz_sysc_soc_id_init_data rzg3s_sysc_soc_id_init_data __initc
const struct rz_sysc_init_data rzg3s_sysc_init_data __initconst = {
.soc_id_init_data = &rzg3s_sysc_soc_id_init_data,
+ .max_register = 0xe20,
};
diff --git a/drivers/soc/renesas/r9a09g047-sys.c b/drivers/soc/renesas/r9a09g047-sys.c
index cd2eb7782cfe..2e8426c03050 100644
--- a/drivers/soc/renesas/r9a09g047-sys.c
+++ b/drivers/soc/renesas/r9a09g047-sys.c
@@ -64,4 +64,5 @@ static const struct rz_sysc_soc_id_init_data rzg3e_sys_soc_id_init_data __initco
const struct rz_sysc_init_data rzg3e_sys_init_data = {
.soc_id_init_data = &rzg3e_sys_soc_id_init_data,
+ .max_register = 0x170c,
};
diff --git a/drivers/soc/renesas/r9a09g057-sys.c b/drivers/soc/renesas/r9a09g057-sys.c
index 4c21cc29edbc..e3390e7c7fe5 100644
--- a/drivers/soc/renesas/r9a09g057-sys.c
+++ b/drivers/soc/renesas/r9a09g057-sys.c
@@ -64,4 +64,5 @@ static const struct rz_sysc_soc_id_init_data rzv2h_sys_soc_id_init_data __initco
const struct rz_sysc_init_data rzv2h_sys_init_data = {
.soc_id_init_data = &rzv2h_sys_soc_id_init_data,
+ .max_register = 0x170c,
};
diff --git a/drivers/soc/renesas/rz-sysc.c b/drivers/soc/renesas/rz-sysc.c
index ffa65fb4dade..c06758faf19f 100644
--- a/drivers/soc/renesas/rz-sysc.c
+++ b/drivers/soc/renesas/rz-sysc.c
@@ -6,8 +6,10 @@
*/
#include <linux/io.h>
+#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/platform_device.h>
+#include <linux/regmap.h>
#include <linux/sys_soc.h>
#include "rz-sysc.h"
@@ -100,14 +102,23 @@ MODULE_DEVICE_TABLE(of, rz_sysc_match);
static int rz_sysc_probe(struct platform_device *pdev)
{
+ const struct rz_sysc_init_data *data;
const struct of_device_id *match;
struct device *dev = &pdev->dev;
+ struct regmap *regmap;
struct rz_sysc *sysc;
+ int ret;
+
+ struct regmap_config *regmap_cfg __free(kfree) = kzalloc(sizeof(*regmap_cfg), GFP_KERNEL);
+ if (!regmap_cfg)
+ return -ENOMEM;
match = of_match_node(rz_sysc_match, dev->of_node);
if (!match)
return -ENODEV;
+ data = match->data;
+
sysc = devm_kzalloc(dev, sizeof(*sysc), GFP_KERNEL);
if (!sysc)
return -ENOMEM;
@@ -117,7 +128,22 @@ static int rz_sysc_probe(struct platform_device *pdev)
return PTR_ERR(sysc->base);
sysc->dev = dev;
- return rz_sysc_soc_init(sysc, match);
+ ret = rz_sysc_soc_init(sysc, match);
+ if (ret)
+ return ret;
+
+ regmap_cfg->name = "rz_sysc_regs";
+ regmap_cfg->reg_bits = 32;
+ regmap_cfg->reg_stride = 4;
+ regmap_cfg->val_bits = 32;
+ regmap_cfg->fast_io = true;
+ regmap_cfg->max_register = data->max_register;
+
+ regmap = devm_regmap_init_mmio(dev, sysc->base, regmap_cfg);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ return of_syscon_register_regmap(dev->of_node, regmap);
}
static struct platform_driver rz_sysc_driver = {
diff --git a/drivers/soc/renesas/rz-sysc.h b/drivers/soc/renesas/rz-sysc.h
index 56bc047a1bff..8eec355d5d56 100644
--- a/drivers/soc/renesas/rz-sysc.h
+++ b/drivers/soc/renesas/rz-sysc.h
@@ -34,9 +34,11 @@ struct rz_sysc_soc_id_init_data {
/**
* struct rz_sysc_init_data - RZ SYSC initialization data
* @soc_id_init_data: RZ SYSC SoC ID initialization data
+ * @max_register: Maximum SYSC register offset to be used by the regmap config
*/
struct rz_sysc_init_data {
const struct rz_sysc_soc_id_init_data *soc_id_init_data;
+ u32 max_register;
};
extern const struct rz_sysc_init_data rzg3e_sys_init_data;
--
2.25.1
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