linux-kernel - [PATCH v6 2/7] reset: mchp: sparx5: Use the second reg item when cpu-syscon is not present

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Message-ID: <20240930121601.172216-3-herve.codina@bootlin.com>
Date: Mon, 30 Sep 2024 14:15:42 +0200
From: Herve Codina <herve.codina@...tlin.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Simon Horman <horms@...nel.org>,
	Lee Jones <lee@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Herve Codina <herve.codina@...tlin.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Lars Povlsen <lars.povlsen@...rochip.com>,
	Steen Hegelund <Steen.Hegelund@...rochip.com>,
	Daniel Machon <daniel.machon@...rochip.com>,
	UNGLinuxDriver@...rochip.com,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Horatiu Vultur <horatiu.vultur@...rochip.com>,
	Andrew Lunn <andrew@...n.ch>,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Allan Nielsen <allan.nielsen@...rochip.com>,
	Steen Hegelund <steen.hegelund@...rochip.com>,
	Luca Ceresoli <luca.ceresoli@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: [PATCH v6 2/7] reset: mchp: sparx5: Use the second reg item when cpu-syscon is not present

In the LAN966x PCI device use case, syscon cannot be used as syscon
devices do not support removal [1]. A syscon device is a core "system"
device and not a device available in some addon boards and so, it is not
supposed to be removed.

In order to remove the syscon usage, use a local mapping of a reg
address range when cpu-syscon is not present.

Link: https://lore.kernel.org/all/20240923100741.11277439@bootlin.com/ [1]
Signed-off-by: Herve Codina <herve.codina@...tlin.com>
---
 drivers/reset/reset-microchip-sparx5.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/reset/reset-microchip-sparx5.c b/drivers/reset/reset-microchip-sparx5.c
index 636e85c388b0..1c095fa41d69 100644
--- a/drivers/reset/reset-microchip-sparx5.c
+++ b/drivers/reset/reset-microchip-sparx5.c
@@ -114,8 +114,22 @@ static int mchp_sparx5_reset_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	err = mchp_sparx5_map_syscon(pdev, "cpu-syscon", &ctx->cpu_ctrl);
-	if (err)
+	switch (err) {
+	case 0:
+		break;
+	case -ENODEV:
+		/*
+		 * The cpu-syscon device is not available.
+		 * Fall back with IO mapping (i.e. mapping from reg property).
+		 */
+		err = mchp_sparx5_map_io(pdev, 1, &ctx->cpu_ctrl);
+		if (err)
+			return err;
+		break;
+	default:
 		return err;
+	}
+
 	err = mchp_sparx5_map_io(pdev, 0, &ctx->gcb_ctrl);
 	if (err)
 		return err;
-- 
2.46.1