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mux: mmio: add generic regmap bitfield-based multiplexer 

Generic register bitfield-based multiplexer that controls the multiplexer
producer defined under a parent node.
The driver corresponding to parent node provides register read/write
capabilities.

Signed-off-by: Pankaj Bansal <pankaj.bansal@nxp.com>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pankaj Bansal 2019-06-12 08:53:00 +00:00 committed by Greg Kroah-Hartman
parent ae1c6b9aa3
commit 8ecfaca792
2 changed files with 11 additions and 7 deletions
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12
drivers/mux/Kconfig
View File

@ -46,14 +46,14 @@ config MUX_GPIO
be called mux-gpio.
config MUX_MMIO
tristate "MMIO register bitfield-controlled Multiplexer"
depends on (OF && MFD_SYSCON) || COMPILE_TEST
tristate "MMIO/Regmap register bitfield-controlled Multiplexer"
depends on OF || COMPILE_TEST
help
MMIO register bitfield-controlled Multiplexer controller.
MMIO/Regmap register bitfield-controlled Multiplexer controller.
The driver builds multiplexer controllers for bitfields in a syscon
register. For N bit wide bitfields, there will be 2^N possible
multiplexer states.
The driver builds multiplexer controllers for bitfields in either
a syscon register or a driver regmap register. For N bit wide
bitfields, there will be 2^N possible multiplexer states.
To compile the driver as a module, choose M here: the module will
be called mux-mmio.

6
drivers/mux/mmio.c
View File

@ -28,6 +28,7 @@ static const struct mux_control_ops mux_mmio_ops = {
static const struct of_device_id mux_mmio_dt_ids[] = {
{ .compatible = "mmio-mux", },
{ .compatible = "reg-mux", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mux_mmio_dt_ids);
@ -43,7 +44,10 @@ static int mux_mmio_probe(struct platform_device *pdev)
int ret;
int i;
regmap = syscon_node_to_regmap(np->parent);
if (of_device_is_compatible(np, "mmio-mux"))
regmap = syscon_node_to_regmap(np->parent);
else
regmap = dev_get_regmap(dev->parent, NULL) ?: ERR_PTR(-ENODEV);
if (IS_ERR(regmap)) {
ret = PTR_ERR(regmap);
dev_err(dev, "failed to get regmap: %d\n", ret);