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spi/of: Create new device registration method and accessors
Dynamically inserting spi device nodes requires the use of a single device registration method. Refactor the existing of_register_spi_devices() to split out the core functionality for a single device into a separate function; of_register_spi_device(). This function will be used by the OF_DYNAMIC overlay code to make live modifications to the tree. Methods to lookup a device/master using a device node are added as well, of_find_spi_master_by_node() & of_find_spi_device_by_node(). Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com> [grant.likely] Split patch into two pieces for clarity Signed-off-by: Grant Likely <grant.likely@linaro.org> Reviewed-by: Mark Brown <broonie@kernel.org> Cc: <linux-spi@vger.kernel.org>
This commit is contained in:
Pantelis Antoniou
Grant Likely
parent
ea7513bbc0
commit
aff5e3f89a
@ -1220,6 +1220,121 @@ err_init_queue:
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/*-------------------------------------------------------------------------*/
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#if defined(CONFIG_OF)
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static struct spi_device *
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of_register_spi_device(struct spi_master *master, struct device_node *nc)
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{
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struct spi_device *spi;
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int rc;
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u32 value;
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/* Alloc an spi_device */
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spi = spi_alloc_device(master);
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if (!spi) {
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dev_err(&master->dev, "spi_device alloc error for %s\n",
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nc->full_name);
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rc = -ENOMEM;
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goto err_out;
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}
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/* Select device driver */
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rc = of_modalias_node(nc, spi->modalias,
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sizeof(spi->modalias));
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if (rc < 0) {
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dev_err(&master->dev, "cannot find modalias for %s\n",
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nc->full_name);
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goto err_out;
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}
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/* Device address */
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rc = of_property_read_u32(nc, "reg", &value);
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if (rc) {
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dev_err(&master->dev, "%s has no valid 'reg' property (%d)\n",
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nc->full_name, rc);
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goto err_out;
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}
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spi->chip_select = value;
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/* Mode (clock phase/polarity/etc.) */
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if (of_find_property(nc, "spi-cpha", NULL))
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spi->mode |= SPI_CPHA;
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if (of_find_property(nc, "spi-cpol", NULL))
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spi->mode |= SPI_CPOL;
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if (of_find_property(nc, "spi-cs-high", NULL))
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spi->mode |= SPI_CS_HIGH;
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if (of_find_property(nc, "spi-3wire", NULL))
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spi->mode |= SPI_3WIRE;
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if (of_find_property(nc, "spi-lsb-first", NULL))
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spi->mode |= SPI_LSB_FIRST;
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/* Device DUAL/QUAD mode */
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if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) {
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switch (value) {
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case 1:
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break;
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case 2:
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spi->mode |= SPI_TX_DUAL;
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break;
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case 4:
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spi->mode |= SPI_TX_QUAD;
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break;
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default:
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dev_warn(&master->dev,
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"spi-tx-bus-width %d not supported\n",
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value);
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break;
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}
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}
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if (!of_property_read_u32(nc, "spi-rx-bus-width", &value)) {
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switch (value) {
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case 1:
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break;
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case 2:
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spi->mode |= SPI_RX_DUAL;
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break;
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case 4:
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spi->mode |= SPI_RX_QUAD;
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break;
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default:
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dev_warn(&master->dev,
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"spi-rx-bus-width %d not supported\n",
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value);
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break;
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}
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}
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/* Device speed */
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rc = of_property_read_u32(nc, "spi-max-frequency", &value);
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if (rc) {
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dev_err(&master->dev, "%s has no valid 'spi-max-frequency' property (%d)\n",
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nc->full_name, rc);
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goto err_out;
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}
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spi->max_speed_hz = value;
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/* IRQ */
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spi->irq = irq_of_parse_and_map(nc, 0);
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/* Store a pointer to the node in the device structure */
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of_node_get(nc);
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spi->dev.of_node = nc;
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/* Register the new device */
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request_module("%s%s", SPI_MODULE_PREFIX, spi->modalias);
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rc = spi_add_device(spi);
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if (rc) {
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dev_err(&master->dev, "spi_device register error %s\n",
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nc->full_name);
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goto err_out;
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}
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return spi;
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err_out:
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spi_dev_put(spi);
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return ERR_PTR(rc);
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}
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/**
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* of_register_spi_devices() - Register child devices onto the SPI bus
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* @master: Pointer to spi_master device
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@ -1231,116 +1346,15 @@ static void of_register_spi_devices(struct spi_master *master)
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{
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struct spi_device *spi;
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struct device_node *nc;
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int rc;
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u32 value;
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if (!master->dev.of_node)
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return;
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for_each_available_child_of_node(master->dev.of_node, nc) {
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/* Alloc an spi_device */
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spi = spi_alloc_device(master);
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if (!spi) {
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dev_err(&master->dev, "spi_device alloc error for %s\n",
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spi = of_register_spi_device(master, nc);
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if (IS_ERR(spi))
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dev_warn(&master->dev, "Failed to create SPI device for %s\n",
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nc->full_name);
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spi_dev_put(spi);
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continue;
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}
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/* Select device driver */
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if (of_modalias_node(nc, spi->modalias,
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sizeof(spi->modalias)) < 0) {
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dev_err(&master->dev, "cannot find modalias for %s\n",
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nc->full_name);
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spi_dev_put(spi);
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continue;
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}
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/* Device address */
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rc = of_property_read_u32(nc, "reg", &value);
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if (rc) {
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dev_err(&master->dev, "%s has no valid 'reg' property (%d)\n",
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nc->full_name, rc);
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spi_dev_put(spi);
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continue;
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}
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spi->chip_select = value;
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/* Mode (clock phase/polarity/etc.) */
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if (of_find_property(nc, "spi-cpha", NULL))
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spi->mode |= SPI_CPHA;
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if (of_find_property(nc, "spi-cpol", NULL))
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spi->mode |= SPI_CPOL;
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if (of_find_property(nc, "spi-cs-high", NULL))
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spi->mode |= SPI_CS_HIGH;
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if (of_find_property(nc, "spi-3wire", NULL))
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spi->mode |= SPI_3WIRE;
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if (of_find_property(nc, "spi-lsb-first", NULL))
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spi->mode |= SPI_LSB_FIRST;
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/* Device DUAL/QUAD mode */
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if (!of_property_read_u32(nc, "spi-tx-bus-width", &value)) {
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switch (value) {
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case 1:
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break;
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case 2:
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spi->mode |= SPI_TX_DUAL;
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break;
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case 4:
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spi->mode |= SPI_TX_QUAD;
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break;
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default:
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dev_warn(&master->dev,
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"spi-tx-bus-width %d not supported\n",
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value);
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break;
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}
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}
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if (!of_property_read_u32(nc, "spi-rx-bus-width", &value)) {
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switch (value) {
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case 1:
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break;
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case 2:
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spi->mode |= SPI_RX_DUAL;
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break;
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case 4:
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spi->mode |= SPI_RX_QUAD;
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break;
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default:
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dev_warn(&master->dev,
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"spi-rx-bus-width %d not supported\n",
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value);
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break;
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}
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}
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/* Device speed */
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rc = of_property_read_u32(nc, "spi-max-frequency", &value);
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if (rc) {
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dev_err(&master->dev, "%s has no valid 'spi-max-frequency' property (%d)\n",
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nc->full_name, rc);
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spi_dev_put(spi);
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continue;
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}
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spi->max_speed_hz = value;
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/* IRQ */
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spi->irq = irq_of_parse_and_map(nc, 0);
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/* Store a pointer to the node in the device structure */
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of_node_get(nc);
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spi->dev.of_node = nc;
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/* Register the new device */
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request_module("%s%s", SPI_MODULE_PREFIX, spi->modalias);
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rc = spi_add_device(spi);
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if (rc) {
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dev_err(&master->dev, "spi_device register error %s\n",
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nc->full_name);
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spi_dev_put(spi);
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}
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}
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}
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#else
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