linux-kernel - [PATCH] pinctrl: ingenic: Fix regmap on X series SoCs

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Date:   Wed,  9 Feb 2022 23:04:54 +0000
From:   Aidan MacDonald <aidanmacdonald.0x0@...il.com>
To:     paul@...pouillou.net, linus.walleij@...aro.org
Cc:     linux-mips@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] pinctrl: ingenic: Fix regmap on X series SoCs

The X series Ingenic SoCs have a shadow GPIO group which
is at a higher offset than the other groups, and is used
for all GPIO configuration. The regmap did not take this
offset into account and set max_register too low. Writes
to the shadow group registers were blocked, which made it
impossible to change any pin configuration.

Fix this by pretending there are at least 8 chips on any
'X' SoC for the purposes of calculating max_register. This
ensures the shadow group is accessible.

Signed-off-by: Aidan MacDonald <aidanmacdonald.0x0@...il.com>
---
 drivers/pinctrl/pinctrl-ingenic.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-ingenic.c b/drivers/pinctrl/pinctrl-ingenic.c
index 2712f51eb238..9d2bccda50f1 100644
--- a/drivers/pinctrl/pinctrl-ingenic.c
+++ b/drivers/pinctrl/pinctrl-ingenic.c
@@ -4168,7 +4168,10 @@ static int __init ingenic_pinctrl_probe(struct platform_device *pdev)
 		return PTR_ERR(base);
 
 	regmap_config = ingenic_pinctrl_regmap_config;
-	regmap_config.max_register = chip_info->num_chips * chip_info->reg_offset;
+	if (chip_info->version >= ID_X1000)
+		regmap_config.max_register = MIN(8, chip_info->num_chips) * chip_info->reg_offset;
+	else
+		regmap_config.max_register = chip_info->num_chips * chip_info->reg_offset;
 
 	jzpc->map = devm_regmap_init_mmio(dev, base, &regmap_config);
 	if (IS_ERR(jzpc->map)) {
-- 
2.34.1