spi: rspi: Add DT support
Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org> Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Geert Uytterhoeven
Mark Brown
parent
29f397b739
commit
426ef76dd8
2 changed files with 136 additions and 29 deletions
59
Documentation/devicetree/bindings/spi/spi-rspi.txt
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59
Documentation/devicetree/bindings/spi/spi-rspi.txt
Normal file
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@ -0,0 +1,59 @@
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Device tree configuration for Renesas RSPI/QSPI driver
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Required properties:
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- compatible : For Renesas Serial Peripheral Interface on legacy SH:
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"renesas,rspi-<soctype>", "renesas,rspi" as fallback.
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For Renesas Serial Peripheral Interface on RZ/A1H:
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"renesas,rspi-<soctype>", "renesas,rspi-rz" as fallback.
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For Quad Serial Peripheral Interface on R-Car Gen2:
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"renesas,qspi-<soctype>", "renesas,qspi" as fallback.
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Examples of valid soctypes are "sh7757" (SH),
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"r7s72100" (RZ/A1H), "r8a7790" (R-Car H2), and
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"r8a7791" (R-Car M2).
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- reg : Address start and address range size of the device
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- interrupts : A list of interrupt-specifiers, one for each entry in
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interrupt-names.
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If interrupt-names is not present, an interrupt specifier
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for a single muxed interrupt.
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- interrupt-names : A list of interrupt names. Should contain (if present):
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- "error" for SPEI,
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- "rx" for SPRI,
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- "tx" to SPTI,
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- "mux" for a single muxed interrupt.
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- interrupt-parent : The phandle for the interrupt controller that
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services interrupts for this device.
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- num-cs : Number of chip selects. Some RSPI cores have more than 1.
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- #address-cells : Must be <1>
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- #size-cells : Must be <0>
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Optional properties:
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- clocks: : Must contain a reference to the functional clock.
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Pinctrl properties might be needed, too. See
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Documentation/devicetree/bindings/pinctrl/renesas,*.
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Examples:
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spi0: spi@e800c800 {
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compatible = "renesas,rspi-r7s72100", "renesas,rspi-rz";
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reg = <0xe800c800 0x24>;
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interrupts = <0 238 IRQ_TYPE_LEVEL_HIGH>,
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<0 239 IRQ_TYPE_LEVEL_HIGH>,
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<0 240 IRQ_TYPE_LEVEL_HIGH>;
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interrupt-names = "error", "rx", "tx";
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interrupt-parent = <&gic>;
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num-cs = <1>;
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#address-cells = <1>;
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#size-cells = <0>;
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};
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spi: spi@e6b10000 {
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compatible = "renesas,qspi-r8a7791", "renesas,qspi";
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reg = <0 0xe6b10000 0 0x2c>;
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interrupt-parent = <&gic>;
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interrupts = <0 184 IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&mstp9_clks R8A7791_CLK_QSPI_MOD>;
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num-cs = <1>;
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#address-cells = <1>;
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#size-cells = <0>;
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};
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@ -31,6 +31,7 @@
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#include <linux/clk.h>
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#include <linux/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/of_device.h>
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#include <linux/sh_dma.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/rspi.h>
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@ -985,6 +986,56 @@ static int rspi_remove(struct platform_device *pdev)
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return 0;
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}
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static const struct spi_ops rspi_ops = {
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.set_config_register = rspi_set_config_register,
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.transfer_one = rspi_transfer_one,
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};
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static const struct spi_ops rspi_rz_ops = {
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.set_config_register = rspi_rz_set_config_register,
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.transfer_one = rspi_rz_transfer_one,
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};
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static const struct spi_ops qspi_ops = {
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.set_config_register = qspi_set_config_register,
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.transfer_one = qspi_transfer_one,
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};
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#ifdef CONFIG_OF
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static const struct of_device_id rspi_of_match[] = {
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/* RSPI on legacy SH */
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{ .compatible = "renesas,rspi", .data = &rspi_ops },
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/* RSPI on RZ/A1H */
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{ .compatible = "renesas,rspi-rz", .data = &rspi_rz_ops },
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/* QSPI on R-Car Gen2 */
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{ .compatible = "renesas,qspi", .data = &qspi_ops },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, rspi_of_match);
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static int rspi_parse_dt(struct device *dev, struct spi_master *master)
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{
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u32 num_cs;
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int error;
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/* Parse DT properties */
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error = of_property_read_u32(dev->of_node, "num-cs", &num_cs);
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if (error) {
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dev_err(dev, "of_property_read_u32 num-cs failed %d\n", error);
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return error;
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}
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master->num_chipselect = num_cs;
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return 0;
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}
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#else
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static inline int rspi_parse_dt(struct device *dev, struct spi_master *master)
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{
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return -EINVAL;
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}
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#endif /* CONFIG_OF */
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static int rspi_request_irq(struct device *dev, unsigned int irq,
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irq_handler_t handler, const char *suffix,
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void *dev_id)
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@ -1004,16 +1055,9 @@ static int rspi_probe(struct platform_device *pdev)
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struct spi_master *master;
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struct rspi_data *rspi;
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int ret;
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const struct rspi_plat_data *rspi_pd = dev_get_platdata(&pdev->dev);
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const struct of_device_id *of_id;
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const struct rspi_plat_data *rspi_pd;
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const struct spi_ops *ops;
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const struct platform_device_id *id_entry = pdev->id_entry;
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ops = (struct spi_ops *)id_entry->driver_data;
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/* ops parameter check */
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if (!ops->set_config_register) {
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dev_err(&pdev->dev, "there is no set_config_register\n");
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return -ENODEV;
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}
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master = spi_alloc_master(&pdev->dev, sizeof(struct rspi_data));
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if (master == NULL) {
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@ -1021,6 +1065,28 @@ static int rspi_probe(struct platform_device *pdev)
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return -ENOMEM;
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}
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of_id = of_match_device(rspi_of_match, &pdev->dev);
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if (of_id) {
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ops = of_id->data;
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ret = rspi_parse_dt(&pdev->dev, master);
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if (ret)
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goto error1;
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} else {
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ops = (struct spi_ops *)pdev->id_entry->driver_data;
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rspi_pd = dev_get_platdata(&pdev->dev);
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if (rspi_pd && rspi_pd->num_chipselect)
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master->num_chipselect = rspi_pd->num_chipselect;
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else
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master->num_chipselect = 2; /* default */
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};
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/* ops parameter check */
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if (!ops->set_config_register) {
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dev_err(&pdev->dev, "there is no set_config_register\n");
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ret = -ENODEV;
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goto error1;
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}
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rspi = spi_master_get_devdata(master);
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platform_set_drvdata(pdev, rspi);
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rspi->ops = ops;
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@ -1048,11 +1114,6 @@ static int rspi_probe(struct platform_device *pdev)
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init_waitqueue_head(&rspi->wait);
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if (rspi_pd && rspi_pd->num_chipselect)
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master->num_chipselect = rspi_pd->num_chipselect;
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else
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master->num_chipselect = 2; /* default */
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master->bus_num = pdev->id;
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master->setup = rspi_setup;
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master->transfer_one = ops->transfer_one;
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@ -1060,6 +1121,7 @@ static int rspi_probe(struct platform_device *pdev)
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master->prepare_message = rspi_prepare_message;
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master->unprepare_message = rspi_unprepare_message;
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master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP;
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master->dev.of_node = pdev->dev.of_node;
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ret = platform_get_irq_byname(pdev, "rx");
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if (ret < 0) {
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@ -1122,21 +1184,6 @@ static int rspi_probe(struct platform_device *pdev)
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return ret;
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}
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static struct spi_ops rspi_ops = {
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.set_config_register = rspi_set_config_register,
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.transfer_one = rspi_transfer_one,
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};
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static struct spi_ops rspi_rz_ops = {
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.set_config_register = rspi_rz_set_config_register,
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.transfer_one = rspi_rz_transfer_one,
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};
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static struct spi_ops qspi_ops = {
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.set_config_register = qspi_set_config_register,
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.transfer_one = qspi_transfer_one,
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};
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static struct platform_device_id spi_driver_ids[] = {
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{ "rspi", (kernel_ulong_t)&rspi_ops },
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{ "rspi-rz", (kernel_ulong_t)&rspi_rz_ops },
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@ -1153,6 +1200,7 @@ static struct platform_driver rspi_driver = {
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.driver = {
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.name = "renesas_spi",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(rspi_of_match),
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},
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};
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module_platform_driver(rspi_driver);
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