spi/imx: add device tree probe support
It adds device tree probe support for spi-imx driver. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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2 changed files with 53 additions and 7 deletions
22
Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
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22
Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
Normal file
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@ -0,0 +1,22 @@
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* Freescale (Enhanced) Configurable Serial Peripheral Interface
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(CSPI/eCSPI) for i.MX
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Required properties:
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- compatible : Should be "fsl,<soc>-cspi" or "fsl,<soc>-ecspi"
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- reg : Offset and length of the register set for the device
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- interrupts : Should contain CSPI/eCSPI interrupt
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- fsl,spi-num-chipselects : Contains the number of the chipselect
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- cs-gpios : Specifies the gpio pins to be used for chipselects.
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Example:
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ecspi@70010000 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "fsl,imx51-ecspi";
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reg = <0x70010000 0x4000>;
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interrupts = <36>;
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fsl,spi-num-chipselects = <2>;
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cs-gpios = <&gpio3 24 0>, /* GPIO4_24 */
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<&gpio3 25 0>; /* GPIO4_25 */
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};
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@ -34,6 +34,9 @@
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#include <linux/spi/spi.h>
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#include <linux/spi/spi_bitbang.h>
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#include <linux/types.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <mach/spi.h>
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@ -604,6 +607,16 @@ static struct platform_device_id spi_imx_devtype[] = {
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}
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};
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static const struct of_device_id spi_imx_dt_ids[] = {
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{ .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
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{ .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
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{ .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
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{ .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
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{ .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
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{ .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
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{ /* sentinel */ }
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};
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static void spi_imx_chipselect(struct spi_device *spi, int is_active)
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{
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struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
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@ -737,19 +750,25 @@ static void spi_imx_cleanup(struct spi_device *spi)
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static int __devinit spi_imx_probe(struct platform_device *pdev)
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{
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struct spi_imx_master *mxc_platform_info;
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struct device_node *np = pdev->dev.of_node;
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const struct of_device_id *of_id =
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of_match_device(spi_imx_dt_ids, &pdev->dev);
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struct spi_imx_master *mxc_platform_info =
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dev_get_platdata(&pdev->dev);
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struct spi_master *master;
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struct spi_imx_data *spi_imx;
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struct resource *res;
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int i, ret, num_cs;
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mxc_platform_info = dev_get_platdata(&pdev->dev);
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if (!mxc_platform_info) {
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if (!np && !mxc_platform_info) {
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dev_err(&pdev->dev, "can't get the platform data\n");
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return -EINVAL;
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}
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ret = of_property_read_u32(np, "fsl,spi-num-chipselects", &num_cs);
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if (ret < 0)
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num_cs = mxc_platform_info->num_chipselect;
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master = spi_alloc_master(&pdev->dev,
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sizeof(struct spi_imx_data) + sizeof(int) * num_cs);
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if (!master)
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@ -764,9 +783,12 @@ static int __devinit spi_imx_probe(struct platform_device *pdev)
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spi_imx->bitbang.master = spi_master_get(master);
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for (i = 0; i < master->num_chipselect; i++) {
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spi_imx->chipselect[i] = mxc_platform_info->chipselect[i];
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if (spi_imx->chipselect[i] < 0)
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int cs_gpio = of_get_named_gpio(np, "cs-gpios", i);
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if (cs_gpio < 0)
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cs_gpio = mxc_platform_info->chipselect[i];
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if (cs_gpio < 0)
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continue;
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spi_imx->chipselect[i] = cs_gpio;
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ret = gpio_request(spi_imx->chipselect[i], DRIVER_NAME);
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if (ret) {
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while (i > 0) {
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@ -788,7 +810,7 @@ static int __devinit spi_imx_probe(struct platform_device *pdev)
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init_completion(&spi_imx->xfer_done);
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spi_imx->devtype_data =
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spi_imx->devtype_data = of_id ? of_id->data :
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(struct spi_imx_devtype_data *) pdev->id_entry->driver_data;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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@ -836,6 +858,7 @@ static int __devinit spi_imx_probe(struct platform_device *pdev)
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spi_imx->devtype_data->intctrl(spi_imx, 0);
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master->dev.of_node = pdev->dev.of_node;
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ret = spi_bitbang_start(&spi_imx->bitbang);
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if (ret) {
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dev_err(&pdev->dev, "bitbang start failed with %d\n", ret);
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@ -898,6 +921,7 @@ static struct platform_driver spi_imx_driver = {
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.driver = {
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.name = DRIVER_NAME,
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.owner = THIS_MODULE,
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.of_match_table = spi_imx_dt_ids,
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},
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.id_table = spi_imx_devtype,
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.probe = spi_imx_probe,
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