On 12/23/2015 10:35 AM, Uri Mashiach wrote:
> Add DT support for the wl1271 SPI WiFi.
>
> Add documentation file for the wl1271 SPI WiFi.
>
> Signed-off-by: Uri Mashiach <uri.mashiach@xxxxxxxxxxxxxx>
> Acked-by: Igor Grinberg <grinberg@xxxxxxxxxxxxxx>
> ---
> .../bindings/net/wireless/ti,wlcore,spi.txt | 35 +++++++++++
> drivers/net/wireless/ti/wlcore/spi.c | 67 +++++++++++++++++++---
> 2 files changed, 95 insertions(+), 7 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt
>
> diff --git a/Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt b/Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt
> new file mode 100644
> index 0000000..a3e7eb7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt
> @@ -0,0 +1,35 @@
> +* Texas Instruments wl1271 wireless lan controller
> +
> +The wl1271 chip can be connected via SPI or via SDIO. This
> +document describes the binding for the SPI connected chip.
> +
> +Required properties:
> +- compatible : Should be "ti,wl1271"
> +- reg : Chip select address of device
> +- spi-max-frequency : Maximum SPI clocking speed of device in Hz
> +- ref-clock-frequency : Reference clock frequency
> +- interrupts : Should contain interrupt line and trigger type
It's good to describe here number of IRQ lines your device have and IRQ types (edge/level)
> +- interrupt-parent : Should be the phandle for the interrupt controller
interrupt-parent is not required (also interrupts-extended can be used)
> + that services interrupts for this device
> +- vwlan-supply : Point the node of the regulator that controls the wl1271 chip WLAN_EN pin
Pls, use gpio if this is required just to toggle WLAN_EN pin.
[ti,] power-gpio or en-gpio
> +
> +Optional properties:
> +- clock-xtal : boolean, clock is generated from XTAL
> +
> +- Please consult Documentation/devicetree/bindings/spi/spi-bus.txt
> + for optional SPI connection related properties,just
> +
> +Examples:
> +
> +&spi1 {
> + wl1271@1 {
> + compatible = "ti,wl1271";
> +
> + reg = <1>;
> + spi-max-frequency = <48000000>;
> + clock-xtal;
> + interrupt-parent = <&gpio3>;
> + interrupts = <8 IRQ_TYPE_LEVEL_HIGH>;
> + wifi-supply = <&wifi_fixed>;
> + };
> +};
> diff --git a/drivers/net/wireless/ti/wlcore/spi.c b/drivers/net/wireless/ti/wlcore/spi.c
> index d3a4bcb..7281f5a 100644
> --- a/drivers/net/wireless/ti/wlcore/spi.c
> +++ b/drivers/net/wireless/ti/wlcore/spi.c
> @@ -30,6 +30,7 @@
> #include <linux/spi/spi.h>
> #include <linux/wl12xx.h>
> #include <linux/platform_device.h>
> +#include <linux/of_irq.h>
> #include <linux/regulator/consumer.h>
>
> #include "wlcore.h"
> @@ -357,6 +358,54 @@ static struct wl1271_if_operations spi_ops = {
> .set_block_size = NULL,
> };
>
> +#ifdef CONFIG_OF
> +static const struct of_device_id wlcore_spi_of_match_table[] = {
> + { .compatible = "ti,wl1271" },
> + { }
> +};
> +
> +/**
> + * wlcore_probe_of - DT node parsing.
> + * @spi: SPI slave device parameters.
> + * @res: resource parameters.
> + * @glue: wl12xx SPI bus to slave device glue parameters.
> + * @pdev_data: wlcore device parameters
> + */
> +static int wlcore_probe_of(struct spi_device *spi, struct resource *res,
> + struct wl12xx_spi_glue *glue,
> + struct wlcore_platdev_data *pdev_data)
> +{
> + struct device_node *dt_node = spi->dev.of_node;
> + int ret;
> +
> + ret = of_irq_to_resource(dt_node, 0, &res[0]);
> + if (spi->irq != ret) {
> + dev_err(glue->dev, "can't get interrupt resource\n");
> + return -EINVAL;
> + }
SPI core will parse IRQ for you (see below)
> +
> + if (of_find_property(dt_node, "clock-xtal", NULL))
> + pdev_data->ref_clock_xtal = true;
> +
> + ret = of_property_read_u32(dt_node, "ref-clock-frequency",
> + &pdev_data->ref_clock_freq);
> + if (IS_ERR_VALUE(ret)) {
> + dev_err(glue->dev,
> + "can't get reference clock frequency (%d)\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +#else /* CONFIG_OF */
> +static int wlcore_probe_of(struct spi_device *spi, struct resource *res,
> + struct wl12xx_spi_glue *glue,
> + struct wlcore_platdev_data *pdev_data)
> +{
> + return -ENODATA;
> +}
> +#endif /* CONFIG_OF */
> +
> static int wl1271_probe(struct spi_device *spi)
> {
> struct wl12xx_spi_glue *glue;
> @@ -365,8 +414,7 @@ static int wl1271_probe(struct spi_device *spi)
> int ret;
>
> memset(&pdev_data, 0x00, sizeof(pdev_data));
> -
> - /* TODO: add DT parsing when needed */
> + memset(res, 0x00, sizeof(res));
>
> pdev_data.if_ops = &spi_ops;
>
> @@ -390,6 +438,13 @@ static int wl1271_probe(struct spi_device *spi)
> return PTR_ERR(glue->reg);
> }
>
> + ret = wlcore_probe_of(spi, &res[0], glue, &pdev_data);
> + if (IS_ERR_VALUE(ret)) {
> + dev_err(glue->dev,
> + "can't get device tree parameters (%d)\n", ret);
> + return ret;
So, wl1271_probe will fail always if CONFIG_OF=n. Right?
> + }
> +
> ret = spi_setup(spi);
> if (ret < 0) {
> dev_err(glue->dev, "spi_setup failed\n");
> @@ -404,10 +459,6 @@ static int wl1271_probe(struct spi_device *spi)
>
> glue->core->dev.parent = &spi->dev;
>
> - memset(res, 0x00, sizeof(res));
> -
> - res[0].start = spi->irq;
> - res[0].flags = IORESOURCE_IRQ;
> res[0].name = "irq";
Above code might be left unchaenged.
>
> ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
> @@ -445,10 +496,12 @@ static int wl1271_remove(struct spi_device *spi)
> return 0;
> }
>
> -
> static struct spi_driver wl1271_spi_driver = {
> .driver = {
> .name = "wl1271_spi",
> +#ifdef CONFIG_OF
> + .of_match_table = of_match_ptr(wlcore_spi_of_match_table),
> +#endif /* CONFIG_OF */
These ifdefs are not needed - see of_match_ptr() definition
> },
>
> .probe = wl1271_probe,
>
--
regards,
-grygorii
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