linux-kernel - Re: [PATCH v6 08/17] reset: npcm: using syscon instead of device data

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Message-ID: <63f8d70ad9c657890669e9c32775632af4e36995.camel@pengutronix.de>
Date:   Thu, 30 Jun 2022 12:59:49 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Tomer Maimon <tmaimon77@...il.com>, avifishman70@...il.com,
        tali.perry1@...il.com, joel@....id.au, venture@...gle.com,
        yuenn@...gle.com, benjaminfair@...gle.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, mturquette@...libre.com,
        sboyd@...nel.org, gregkh@...uxfoundation.org,
        daniel.lezcano@...aro.org, tglx@...utronix.de,
        wim@...ux-watchdog.org, linux@...ck-us.net,
        catalin.marinas@....com, will@...nel.org, arnd@...db.de,
        olof@...om.net, jirislaby@...nel.org, shawnguo@...nel.org,
        bjorn.andersson@...aro.org, geert+renesas@...der.be,
        marcel.ziswiler@...adex.com, vkoul@...nel.org,
        biju.das.jz@...renesas.com, nobuhiro1.iwamatsu@...hiba.co.jp,
        robert.hancock@...ian.com, j.neuschaefer@....net, lkundrak@...sk
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v6 08/17] reset: npcm: using syscon instead of device
 data

Hi Tomer,

On Do, 2022-06-30 at 13:35 +0300, Tomer Maimon wrote:
Using syscon device tree property instead of device data to handle the
NPCM general control registers.

In case the syscon not found the code still search for nuvoton,npcm750-gcr
to support DTS backward compatibility.

Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
---
 drivers/reset/reset-npcm.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/reset/reset-npcm.c b/drivers/reset/reset-npcm.c
index 2ea4d3136e15..431ff2b602c5 100644
--- a/drivers/reset/reset-npcm.c
+++ b/drivers/reset/reset-npcm.c
@@ -138,8 +138,7 @@ static int npcm_reset_xlate(struct reset_controller_dev *rcdev,
 }
 

 static const struct of_device_id npcm_rc_match[] = {
-	{ .compatible = "nuvoton,npcm750-reset",
-		.data = (void *)"nuvoton,npcm750-gcr" },
+	{ .compatible = "nuvoton,npcm750-reset"},

Add a space.                                  ^^

 	{ }
 };
 

@@ -155,15 +154,15 @@ static int npcm_usb_reset(struct platform_device *pdev, struct npcm_rc_data *rc)
 	u32 ipsrst1_bits = 0;
 	u32 ipsrst2_bits = NPCM_IPSRST2_USB_HOST;
 	u32 ipsrst3_bits = 0;
-	const char *gcr_dt;
 

-	gcr_dt = (const char *)
-	of_match_device(dev->driver->of_match_table, dev)->data;
-
-	gcr_regmap = syscon_regmap_lookup_by_compatible(gcr_dt);
+	gcr_regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "nuvoton,sysgcr");
 	if (IS_ERR(gcr_regmap)) {
-		dev_err(&pdev->dev, "Failed to find %s\n", gcr_dt);
-		return PTR_ERR(gcr_regmap);
+		dev_warn(&pdev->dev, "Failed to find nuvoton,sysgcr search for nuvoton,npcm750-gcr for Poleg backward compatibility");

Is this warning useful to the user? Maybe add suggestion like "please
update the device tree". Also there is no further message if
nuvoton,npcm750-gcr is found and all is well.

regards
Philipp