On Mon, 2024-10-21 at 14:40 +0200, Angelo Dureghello wrote: > From: Angelo Dureghello <adureghello@xxxxxxxxxxxx> > > Change to obtain the fdt use case as reported in the > adi,ad3552r.yaml file in this patchset. > > The DAC device is defined as a child node of the backend. > Registering the child fdt node as a platform devices. > > Signed-off-by: Angelo Dureghello <adureghello@xxxxxxxxxxxx> > --- > drivers/iio/dac/adi-axi-dac.c | 53 > +++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 53 insertions(+) > > diff --git a/drivers/iio/dac/adi-axi-dac.c b/drivers/iio/dac/adi-axi-dac.c > index 9d6809fe7a67..7f7ef3e219ba 100644 > --- a/drivers/iio/dac/adi-axi-dac.c > +++ b/drivers/iio/dac/adi-axi-dac.c > @@ -29,6 +29,8 @@ > #include <linux/iio/buffer.h> > #include <linux/iio/iio.h> > > +#include "ad3552r-hs.h" > + > /* > * Register definitions: > * https://wiki.analog.com/resources/fpga/docs/axi_dac_ip#register_map > @@ -97,6 +99,7 @@ struct axi_dac_info { > unsigned int version; > const struct iio_backend_info *backend_info; > bool has_dac_clk; > + bool has_child_nodes; > }; > > struct axi_dac_state { > @@ -723,6 +726,35 @@ static int axi_dac_bus_reg_read(struct iio_backend *back, > u32 reg, u32 *val, > return regmap_read(st->regmap, AXI_DAC_CUSTOM_RD_REG, val); > } > > +static void axi_dac_child_remove(void *data) > +{ > + platform_device_unregister(data); > +} > + > +static int axi_dac_create_platform_device(struct axi_dac_state *st, > + struct fwnode_handle *child) > +{ > + struct ad3552r_hs_platform_data pdata = { > + .bus_reg_read = axi_dac_bus_reg_read, > + .bus_reg_write = axi_dac_bus_reg_write, > + }; > + struct platform_device_info pi = { > + .parent = st->dev, > + .name = fwnode_get_name(child), > + .id = PLATFORM_DEVID_AUTO, > + .fwnode = child, > + .data = &pdata, > + .size_data = sizeof(pdata), > + }; > + struct platform_device *pdev; > + > + pdev = platform_device_register_full(&pi); > + if (IS_ERR(pdev)) > + return PTR_ERR(pdev); > + > + return devm_add_action_or_reset(st->dev, axi_dac_child_remove, pdev); > +} > + > static const struct iio_backend_ops axi_dac_generic_ops = { > .enable = axi_dac_enable, > .disable = axi_dac_disable, > @@ -865,6 +897,26 @@ static int axi_dac_probe(struct platform_device *pdev) > return dev_err_probe(&pdev->dev, ret, > "failed to register iio backend\n"); > > + if (st->info->has_child_nodes) { I would prefer to not be silent on possible misconfigurations. IOW, moving the check inside the loop and error out if (!st->info->has_child_nodes) - Nuno Sá
