linux-kernel - [PATCH v2 04/21] pinctrl: aspeed-g5: Adapt to new LPC device tree layout

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Message-Id: <20210319062752.145730-4-andrew@aj.id.au>
Date:   Fri, 19 Mar 2021 16:57:35 +1030
From:   Andrew Jeffery <andrew@...id.au>
To:     openipmi-developer@...ts.sourceforge.net, openbmc@...ts.ozlabs.org,
        minyard@....org
Cc:     joel@....id.au, ryan_chen@...eedtech.com,
        "Chia-Wei, Wang" <chiawei_wang@...eedtech.com>,
        devicetree@...r.kernel.org, tmaimon77@...il.com,
        linux-aspeed@...ts.ozlabs.org, linux-gpio@...r.kernel.org,
        avifishman70@...il.com, venture@...gle.com,
        linus.walleij@...aro.org, linux-kernel@...r.kernel.org,
        tali.perry1@...il.com, robh+dt@...nel.org, lee.jones@...aro.org,
        linux-arm-kernel@...ts.infradead.org, benjaminfair@...gle.com
Subject: [PATCH v2 04/21] pinctrl: aspeed-g5: Adapt to new LPC device tree layout

From: "Chia-Wei, Wang" <chiawei_wang@...eedtech.com>

Add check against LPC device v2 compatible string to
ensure that the fixed device tree layout is adopted.
The LPC register offsets are also fixed accordingly.

Signed-off-by: Chia-Wei Wang <chiawei_wang@...eedtech.com>
Reviewed-by: Andrew Jeffery <andrew@...id.au>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/pinctrl/aspeed/pinctrl-aspeed-g5.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/pinctrl/aspeed/pinctrl-aspeed-g5.c b/drivers/pinctrl/aspeed/pinctrl-aspeed-g5.c
index 0cab4c2576e2..996ebcba4d38 100644
--- a/drivers/pinctrl/aspeed/pinctrl-aspeed-g5.c
+++ b/drivers/pinctrl/aspeed/pinctrl-aspeed-g5.c
@@ -60,7 +60,7 @@
 #define COND2		{ ASPEED_IP_SCU, SCU94, GENMASK(1, 0), 0, 0 }
 
 /* LHCR0 is offset from the end of the H8S/2168-compatible registers */
-#define LHCR0		0x20
+#define LHCR0		0xa0
 #define GFX064		0x64
 
 #define B14 0
@@ -2648,14 +2648,19 @@ static struct regmap *aspeed_g5_acquire_regmap(struct aspeed_pinmux_data *ctx,
 	}
 
 	if (ip == ASPEED_IP_LPC) {
-		struct device_node *node;
+		struct device_node *np;
 		struct regmap *map;
 
-		node = of_parse_phandle(ctx->dev->of_node,
+		np = of_parse_phandle(ctx->dev->of_node,
 					"aspeed,external-nodes", 1);
-		if (node) {
-			map = syscon_node_to_regmap(node->parent);
-			of_node_put(node);
+		if (np) {
+			if (!of_device_is_compatible(np->parent, "aspeed,ast2400-lpc-v2") &&
+			    !of_device_is_compatible(np->parent, "aspeed,ast2500-lpc-v2") &&
+			    !of_device_is_compatible(np->parent, "aspeed,ast2600-lpc-v2"))
+				return ERR_PTR(-ENODEV);
+
+			map = syscon_node_to_regmap(np->parent);
+			of_node_put(np);
 			if (IS_ERR(map))
 				return map;
 		} else
-- 
2.27.0