Hello Guenter,

thank you for your feedback.

-----Original Message-----
From: devicetree-owner@vger.kernel.org [mailto:devicetree-owner@vger.kernel.org] On Behalf Of Guenter Roeck
Sent: 02 February 2018 02:56
To: Fabrizio Castro <redacted>; Philipp Zabel <p.zabel@pengutronix.de>; Rob Herring <robh+dt@kernel.org>;
Mark Rutland [off-list ref]; Wim Van Sebroeck [off-list ref]; Russell King [off-list ref]; Catalin
Marinas [off-list ref]; Will Deacon [off-list ref]; Michael Turquette [off-list ref];
Stephen Boyd [off-list ref]; Simon Horman [off-list ref]; Magnus Damm [off-list ref];
Geert Uytterhoeven [off-list ref]; Wolfram Sang [off-list ref]
Cc: devicetree@vger.kernel.org; linux-watchdog@vger.kernel.org; linux-renesas-soc@vger.kernel.org; linux-arm-
kernel@lists.infradead.org; linux-clk@vger.kernel.org; Chris Paterson [off-list ref]; Biju Das
[off-list ref]; Ramesh Shanmugasundaram [off-list ref]
Subject: Re: [RFC v4 12/26] watchdog: renesas_wdt: Add R-Car Gen2 support

On 01/31/2018 10:24 AM, Fabrizio Castro wrote:

quoted

Due to commits:
* "ARM: shmobile: Add watchdog support",
* "ARM: shmobile: rcar-gen2: Add watchdog support", and
* "soc: renesas: rcar-rst: Enable watchdog as reset trigger for Gen2",
we now have everything we needed for the watchdog to work on Gen2 and
RZ/G1.

This commit adds "renesas,rcar-gen2-wdt" as compatible string for R-Car
Gen2 and RZ/G1, and since on those platforms the rwdt clock needs to be
always ON, when suspending to RAM we need to explicitly disable the
counting by clearing TME from RWTCSRA.

Signed-off-by: Fabrizio Castro <redacted>
Signed-off-by: Ramesh Shanmugasundaram <redacted>
---
v3->4:
* in this new version the changes to the driver have been splitted into
   two commits, this patch takes care of the basic Gen2 support, patch 13/26
   takes care of the restart handler.

  drivers/watchdog/renesas_wdt.c | 42 +++++++++++++++++++++++++++++++++++++-----
  1 file changed, 37 insertions(+), 5 deletions(-)

diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
index 831ef83..0a1a402 100644
--- a/drivers/watchdog/renesas_wdt.c
+++ b/drivers/watchdog/renesas_wdt.c

@@ -203,13 +203,42 @@ static int rwdt_remove(struct platform_device *pdev)
  return 0;
  }

-/*
- * This driver does also fit for R-Car Gen2 (r8a779[0-4]) WDT. However, for SMP
- * to work there, one also needs a RESET (RST) driver which does not exist yet
- * due to HW issues. This needs to be solved before adding compatibles here.
- */
+#ifdef CONFIG_PM
+static int rwdt_suspend(struct device *dev)
+{
+struct platform_device *pdev;
+struct rwdt_priv *priv;
+
+pdev = to_platform_device(dev);
+priv = platform_get_drvdata(pdev);
+if (watchdog_active(&priv->wdev)) {
+rwdt_write(priv, priv->cks, RWTCSRA);
+}

Unnecessary { }

quoted

+return 0;
+}
+
+static int rwdt_resume(struct device *dev)
+{
+struct platform_device *pdev;
+struct rwdt_priv *priv;
+
+pdev = to_platform_device(dev);
+priv = platform_get_drvdata(pdev);
+if (watchdog_active(&priv->wdev)) {
+rwdt_write(priv, priv->cks | RWTCSRA_TME, RWTCSRA);
+}

Same here. FWIW, checkpatch does complain about that.

I will clean this up for the next (and hopefully last) iteration.

Thanks,
Fabrizio

Guenter
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