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mfd: syscon: Add a DT property to set value width

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Currently syscon has a fixed configuration of 32 bits for register and
values widths. In some cases, it would be desirable to be able to
customize the value width.

For example, certain boards (like the ones manufactured by Technologic
Systems) have a FPGA that is memory-mapped, but its registers are only
16-bit wide.

This patch adds an optional "reg-io-width" DT binding for syscon that
allows to change the width for the data bus (i.e. val_bits). If this
property is provided, it will also set the register stride to
reg-io-width's value. If not provided, the default configuration is
used.

Signed-off-by: Damien Riegel <damien.riegel@savoirfairelinux.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Damien Riegel 2015-11-30 10:59:47 -05:00 committed by Lee Jones
parent 32e9725d9a
commit db2fb60cd3
2 changed files with 17 additions and 0 deletions
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4
Documentation/devicetree/bindings/mfd/syscon.txt
View File

@ -13,6 +13,10 @@ Required properties:
- compatible: Should contain "syscon".
- reg: the register region can be accessed from syscon
Optional property:
- reg-io-width: the size (in bytes) of the IO accesses that should be
performed on the device.
Examples:
gpr: iomuxc-gpr@020e0000 {
compatible = "fsl,imx6q-iomuxc-gpr", "syscon";

13
drivers/mfd/syscon.c
View File

@ -47,6 +47,7 @@ static struct syscon *of_syscon_register(struct device_node *np)
struct syscon *syscon;
struct regmap *regmap;
void __iomem *base;
u32 reg_io_width;
int ret;
struct regmap_config syscon_config = syscon_regmap_config;
@ -69,6 +70,18 @@ static struct syscon *of_syscon_register(struct device_node *np)
else if (of_property_read_bool(np, "little-endian"))
syscon_config.val_format_endian = REGMAP_ENDIAN_LITTLE;
/*
* search for reg-io-width property in DT. If it is not provided,
* default to 4 bytes. regmap_init_mmio will return an error if values
* are invalid so there is no need to check them here.
*/
ret = of_property_read_u32(np, "reg-io-width", &reg_io_width);
if (ret)
reg_io_width = 4;
syscon_config.reg_stride = reg_io_width;
syscon_config.val_bits = reg_io_width * 8;
regmap = regmap_init_mmio(NULL, base, &syscon_config);
if (IS_ERR(regmap)) {
pr_err("regmap init failed\n");