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>
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@ -46,14 +46,14 @@ config MUX_GPIO
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be called mux-gpio.
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config MUX_MMIO
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tristate "MMIO register bitfield-controlled Multiplexer"
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depends on (OF && MFD_SYSCON) || COMPILE_TEST
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tristate "MMIO/Regmap register bitfield-controlled Multiplexer"
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depends on OF || COMPILE_TEST
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help
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MMIO register bitfield-controlled Multiplexer controller.
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MMIO/Regmap register bitfield-controlled Multiplexer controller.
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The driver builds multiplexer controllers for bitfields in a syscon
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register. For N bit wide bitfields, there will be 2^N possible
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multiplexer states.
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The driver builds multiplexer controllers for bitfields in either
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a syscon register or a driver regmap register. For N bit wide
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bitfields, there will be 2^N possible multiplexer states.
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To compile the driver as a module, choose M here: the module will
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be called mux-mmio.
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@ -28,6 +28,7 @@ static const struct mux_control_ops mux_mmio_ops = {
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static const struct of_device_id mux_mmio_dt_ids[] = {
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{ .compatible = "mmio-mux", },
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{ .compatible = "reg-mux", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mux_mmio_dt_ids);
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@ -43,7 +44,10 @@ static int mux_mmio_probe(struct platform_device *pdev)
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int ret;
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int i;
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regmap = syscon_node_to_regmap(np->parent);
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if (of_device_is_compatible(np, "mmio-mux"))
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regmap = syscon_node_to_regmap(np->parent);
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else
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regmap = dev_get_regmap(dev->parent, NULL) ?: ERR_PTR(-ENODEV);
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if (IS_ERR(regmap)) {
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ret = PTR_ERR(regmap);
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dev_err(dev, "failed to get regmap: %d\n", ret);
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