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| author | Pankaj Bansal <pankaj.bansal@nxp.com> | 2019-06-12 08:53:00 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-21 15:59:53 +0200 |
| commit | 8ecfaca7926f4bb9fb584df070f50acd407e52ce (patch) | |
| tree | aea943a500e522415e96a3dc4814d0c0462e6adc /drivers/mux | |
| parent | ae1c6b9aa34be021555e1234a271d56108caa82e (diff) | |
| download | lwn-8ecfaca7926f4bb9fb584df070f50acd407e52ce.tar.gz lwn-8ecfaca7926f4bb9fb584df070f50acd407e52ce.zip | |
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/Kconfig | 12 | ||||
| -rw-r--r-- | 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); |