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Message-ID: <20250804195723.3963524-3-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Mon, 4 Aug 2025 20:57:19 +0100
From: Prabhakar <prabhakar.csengg@...il.com>
To: Wim Van Sebroeck <wim@...ux-watchdog.org>,
Guenter Roeck <linux@...ck-us.net>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Wolfram Sang <wsa+renesas@...g-engineering.com>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Magnus Damm <magnus.damm@...il.com>
Cc: linux-watchdog@...r.kernel.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-renesas-soc@...r.kernel.org,
Prabhakar <prabhakar.csengg@...il.com>,
Biju Das <biju.das.jz@...renesas.com>,
Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH v3 2/6] watchdog: rzv2h: Obtain clock-divider and timeout values from OF match data
From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Update the rzv2h_wdt driver to fetch clock configuration and timeout
parameters from device tree match data rather than relying on hardcoded
constants. Introduce a new structure rzv2h_of_data that encapsulates
minimum and maximum clock select values (cks_min and cks_max), clock
divider (cks_div), timeout cycle count (timeout_cycles), and the
timeout period select bits (tops). These values are provided through
the OF match table and retrieved via of_device_get_match_data() during
probe.
This change allows dynamic configuration of the watchdog timer for
different SoCs, such as the RZ/T2H, which require different settings.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
---
v2->v3:
- Updated struct rzv2h_of_data to include tops and timeout_cycles.
- Updated max_hw_heartbeat_ms calculation to use the new struct fields.
- Updated commit message to clarify that the change is to obtain
clock-divider and timeout values from OF match data.
- Added reviewed-by from Wolfram.
v1->v2:
- No changes.
---
drivers/watchdog/rzv2h_wdt.c | 35 ++++++++++++++++++++++++++---------
1 file changed, 26 insertions(+), 9 deletions(-)
diff --git a/drivers/watchdog/rzv2h_wdt.c b/drivers/watchdog/rzv2h_wdt.c
index 8defd0241213..755067800ebb 100644
--- a/drivers/watchdog/rzv2h_wdt.c
+++ b/drivers/watchdog/rzv2h_wdt.c
@@ -35,9 +35,6 @@
#define WDTRCR_RSTIRQS BIT(7)
-#define MAX_TIMEOUT_CYCLES 16384
-#define CLOCK_DIV_BY_256 256
-
#define WDT_DEFAULT_TIMEOUT 60U
static bool nowayout = WATCHDOG_NOWAYOUT;
@@ -45,12 +42,21 @@ module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+struct rzv2h_of_data {
+ u8 cks_min;
+ u8 cks_max;
+ u16 cks_div;
+ u8 tops;
+ u16 timeout_cycles;
+};
+
struct rzv2h_wdt_priv {
void __iomem *base;
struct clk *pclk;
struct clk *oscclk;
struct reset_control *rstc;
struct watchdog_device wdev;
+ const struct rzv2h_of_data *of_data;
};
static int rzv2h_wdt_ping(struct watchdog_device *wdev)
@@ -84,6 +90,7 @@ static void rzv2h_wdt_setup(struct watchdog_device *wdev, u16 wdtcr)
static int rzv2h_wdt_start(struct watchdog_device *wdev)
{
struct rzv2h_wdt_priv *priv = watchdog_get_drvdata(wdev);
+ const struct rzv2h_of_data *of_data = priv->of_data;
int ret;
ret = pm_runtime_resume_and_get(wdev->parent);
@@ -106,8 +113,8 @@ static int rzv2h_wdt_start(struct watchdog_device *wdev)
* - RPES[9:8] - Window End Position Select - 11b: 0%
* - TOPS[1:0] - Timeout Period Select - 11b: 16384 cycles (3FFFh)
*/
- rzv2h_wdt_setup(wdev, WDTCR_CKS_CLK_256 | WDTCR_RPSS_100 |
- WDTCR_RPES_0 | WDTCR_TOPS_16384);
+ rzv2h_wdt_setup(wdev, of_data->cks_max | WDTCR_RPSS_100 |
+ WDTCR_RPES_0 | of_data->tops);
/*
* Down counting starts after writing the sequence 00h -> FFh to the
@@ -184,7 +191,7 @@ static int rzv2h_wdt_restart(struct watchdog_device *wdev,
* - RPES[9:8] - Window End Position Select - 00b: 75%
* - TOPS[1:0] - Timeout Period Select - 00b: 1024 cycles (03FFh)
*/
- rzv2h_wdt_setup(wdev, WDTCR_CKS_CLK_1 | WDTCR_RPSS_25 |
+ rzv2h_wdt_setup(wdev, priv->of_data->cks_min | WDTCR_RPSS_25 |
WDTCR_RPES_75 | WDTCR_TOPS_1024);
rzv2h_wdt_ping(wdev);
@@ -213,6 +220,8 @@ static int rzv2h_wdt_probe(struct platform_device *pdev)
if (!priv)
return -ENOMEM;
+ priv->of_data = of_device_get_match_data(dev);
+
priv->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
@@ -230,8 +239,8 @@ static int rzv2h_wdt_probe(struct platform_device *pdev)
return dev_err_probe(dev, PTR_ERR(priv->rstc),
"failed to get cpg reset");
- priv->wdev.max_hw_heartbeat_ms = (MILLI * MAX_TIMEOUT_CYCLES * CLOCK_DIV_BY_256) /
- clk_get_rate(priv->oscclk);
+ priv->wdev.max_hw_heartbeat_ms = (MILLI * priv->of_data->timeout_cycles *
+ priv->of_data->cks_div) / clk_get_rate(priv->oscclk);
dev_dbg(dev, "max hw timeout of %dms\n", priv->wdev.max_hw_heartbeat_ms);
ret = devm_pm_runtime_enable(dev);
@@ -254,8 +263,16 @@ static int rzv2h_wdt_probe(struct platform_device *pdev)
return devm_watchdog_register_device(dev, &priv->wdev);
}
+static const struct rzv2h_of_data rzv2h_wdt_of_data = {
+ .cks_min = WDTCR_CKS_CLK_1,
+ .cks_max = WDTCR_CKS_CLK_256,
+ .cks_div = 256,
+ .tops = WDTCR_TOPS_16384,
+ .timeout_cycles = 16384,
+};
+
static const struct of_device_id rzv2h_wdt_ids[] = {
- { .compatible = "renesas,r9a09g057-wdt", },
+ { .compatible = "renesas,r9a09g057-wdt", .data = &rzv2h_wdt_of_data },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, rzv2h_wdt_ids);
--
2.50.1
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