diff options
| author | Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> | 2025-08-20 21:23:20 +0100 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@linux-watchdog.org> | 2025-09-12 18:06:30 +0200 |
| commit | ef6080fec60af92fc00b96743e85779927baf87b (patch) | |
| tree | 41898cf444d8fb41a37683986efa69ed20c1c43d | |
| parent | 6229b35298af8c3cb983d866e9da1c1ad4803cc6 (diff) | |
watchdog: rzv2h: Add support for configurable count clock source
Add support for selecting the count clock source used by the watchdog
timer. The RZ/V2H(P) SoC uses the LOCO as the count source, whereas on
RZ/T2H and RZ/N2H SoCs, the count source is the peripheral clock (PCLKL).
Introduce a `count_source` field in the SoC-specific data structure and
refactor the clock rate selection logic accordingly. This prepares the
driver for supporting the RZ/T2H and RZ/N2H SoCs, which differ in their
watchdog clocking architecture from RZ/V2H(P).
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
| -rw-r--r-- | drivers/watchdog/rzv2h_wdt.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/watchdog/rzv2h_wdt.c b/drivers/watchdog/rzv2h_wdt.c index 3c02960b65cf..e71d1e108f69 100644 --- a/drivers/watchdog/rzv2h_wdt.c +++ b/drivers/watchdog/rzv2h_wdt.c @@ -42,12 +42,18 @@ module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); +enum rzv2h_wdt_count_source { + COUNT_SOURCE_LOCO, + COUNT_SOURCE_PCLK, +}; + struct rzv2h_of_data { u8 cks_min; u8 cks_max; u16 cks_div; u8 tops; u16 timeout_cycles; + enum rzv2h_wdt_count_source count_source; }; struct rzv2h_wdt_priv { @@ -214,6 +220,7 @@ static int rzv2h_wdt_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct rzv2h_wdt_priv *priv; + struct clk *count_clk; int ret; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); @@ -239,8 +246,19 @@ static int rzv2h_wdt_probe(struct platform_device *pdev) return dev_err_probe(dev, PTR_ERR(priv->rstc), "failed to get cpg reset"); + switch (priv->of_data->count_source) { + case COUNT_SOURCE_LOCO: + count_clk = priv->oscclk; + break; + case COUNT_SOURCE_PCLK: + count_clk = priv->pclk; + break; + default: + return dev_err_probe(dev, -EINVAL, "Invalid count source\n"); + } + priv->wdev.max_hw_heartbeat_ms = (MILLI * priv->of_data->timeout_cycles * - priv->of_data->cks_div) / clk_get_rate(priv->oscclk); + priv->of_data->cks_div) / clk_get_rate(count_clk); dev_dbg(dev, "max hw timeout of %dms\n", priv->wdev.max_hw_heartbeat_ms); ret = devm_pm_runtime_enable(dev); @@ -269,6 +287,7 @@ static const struct rzv2h_of_data rzv2h_wdt_of_data = { .cks_div = 256, .tops = WDTCR_TOPS_16384, .timeout_cycles = 16384, + .count_source = COUNT_SOURCE_LOCO, }; static const struct of_device_id rzv2h_wdt_ids[] = { |