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Subject[RESEND PATCH 2/2] mux: mmio: add generic regmap bitfield-based multiplexer
Date
From: Pankaj Bansal <pankaj.bansal@nxp.com>

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>
---
drivers/mux/Kconfig | 12 ++++++------
drivers/mux/mmio.c | 6 +++++-
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);
--
2.11.0
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