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mfd: syscon: Use regmap max_register_is_0 as needed

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syscon has always set the optional max_register configuration of
regmap to ensure the correct checks are in place. However, a recent
commit 0ec74ad3c1 ("regmap: rework ->max_register handling")
introduced explicit configuration in regmap framework for register
maps that is exactly 1 register, when max_register is pointing to a
valid register 0. This commit solved a previous limitation of regmap
framework.

Update syscon driver to consistent in regmap configuration for
all sizes of syscons by using this new capability by setting
max_register_is_0, when the max_register is valid and 0.

Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20240903184710.1552067-1-nm@ti.com
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Nishanth Menon 2024-09-03 13:47:10 -05:00 committed by Lee Jones
parent 98b5f7706f
commit 2e63d6fa11
1 changed files with 5 additions and 0 deletions
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5
drivers/mfd/syscon.c
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@ -108,6 +108,8 @@ static struct syscon *of_syscon_register(struct device_node *np, bool check_res)
syscon_config.reg_stride = reg_io_width;
syscon_config.val_bits = reg_io_width * 8;
syscon_config.max_register = resource_size(&res) - reg_io_width;
if (!syscon_config.max_register)
syscon_config.max_register_is_0 = true;
regmap = regmap_init_mmio(NULL, base, &syscon_config);
kfree(syscon_config.name);
@ -357,6 +359,9 @@ static int syscon_probe(struct platform_device *pdev)
return -ENOMEM;
syscon_config.max_register = resource_size(res) - 4;
if (!syscon_config.max_register)
syscon_config.max_register_is_0 = true;
if (pdata)
syscon_config.name = pdata->label;
syscon->regmap = devm_regmap_init_mmio(dev, base, &syscon_config);