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authorPankaj Bansal <pankaj.bansal@nxp.com>2019-06-12 08:53:00 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-06-21 15:59:53 +0200
commit8ecfaca7926f4bb9fb584df070f50acd407e52ce (patch)
treeaea943a500e522415e96a3dc4814d0c0462e6adc /drivers/mux
parentae1c6b9aa34be021555e1234a271d56108caa82e (diff)
downloadlinux-8ecfaca7926f4bb9fb584df070f50acd407e52ce.tar.bz2
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>
Diffstat (limited to 'drivers/mux')
-rw-r--r--drivers/mux/Kconfig12
-rw-r--r--drivers/mux/mmio.c6
2 files changed, 11 insertions, 7 deletions
diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig
index 7659d6c5f718..e5c571fd232c 100644
--- a/drivers/mux/Kconfig
+++ b/drivers/mux/Kconfig
@@ -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.
diff --git a/drivers/mux/mmio.c b/drivers/mux/mmio.c
index 935ac44aa209..44a7a0e885b8 100644
--- a/drivers/mux/mmio.c
+++ b/drivers/mux/mmio.c
@@ -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);