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Subject[PATCH 5.5 161/170] staging: wfx: add proper "compatible" string
Date
From: Michał Mirosław <mirq-linux@rere.qmqm.pl>

commit eec6e3ee636ec3adaa85ebe4b4acaacfcf06277e upstream.

Add "compatible" string matching "vendor,chip" template and proper
GPIO flags handling. Keep support for old name and reset polarity
for older devicetrees.

Cc: stable@vger.kernel.org # d3a5bcb4a17f ("gpio: add gpiod_toggle_active_low()")
Cc: stable@vger.kernel.org
Fixes: 0096214a59a7 ("staging: wfx: add support for I/O access")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Link: https://lore.kernel.org/r/0e6dda06f145676861860f073a53dc95987c7ab5.1581416843.git.mirq-linux@rere.qmqm.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/staging/wfx/Documentation/devicetree/bindings/net/wireless/siliabs,wfx.txt | 7 ++---
drivers/staging/wfx/bus_spi.c | 14 +++++++---
2 files changed, 14 insertions(+), 7 deletions(-)

--- a/drivers/staging/wfx/Documentation/devicetree/bindings/net/wireless/siliabs,wfx.txt
+++ b/drivers/staging/wfx/Documentation/devicetree/bindings/net/wireless/siliabs,wfx.txt
@@ -6,7 +6,7 @@ SPI
You have to declare the WFxxx chip in your device tree.

Required properties:
- - compatible: Should be "silabs,wfx-spi"
+ - compatible: Should be "silabs,wf200"
- reg: Chip select address of device
- spi-max-frequency: Maximum SPI clocking speed of device in Hz
- interrupts-extended: Should contain interrupt line (interrupt-parent +
@@ -15,6 +15,7 @@ Required properties:
Optional properties:
- reset-gpios: phandle of gpio that will be used to reset chip during probe.
Without this property, you may encounter issues with warm boot.
+ (Legacy: when compatible == "silabs,wfx-spi", the gpio is inverted.)

Please consult Documentation/devicetree/bindings/spi/spi-bus.txt for optional
SPI connection related properties,
@@ -23,12 +24,12 @@ Example:

&spi1 {
wfx {
- compatible = "silabs,wfx-spi";
+ compatible = "silabs,wf200";
pinctrl-names = "default";
pinctrl-0 = <&wfx_irq &wfx_gpios>;
interrupts-extended = <&gpio 16 IRQ_TYPE_EDGE_RISING>;
wakeup-gpios = <&gpio 12 GPIO_ACTIVE_HIGH>;
- reset-gpios = <&gpio 13 GPIO_ACTIVE_HIGH>;
+ reset-gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
reg = <0>;
spi-max-frequency = <42000000>;
};
--- a/drivers/staging/wfx/bus_spi.c
+++ b/drivers/staging/wfx/bus_spi.c
@@ -27,6 +27,8 @@ MODULE_PARM_DESC(gpio_reset, "gpio numbe
#define SET_WRITE 0x7FFF /* usage: and operation */
#define SET_READ 0x8000 /* usage: or operation */

+#define WFX_RESET_INVERTED 1
+
static const struct wfx_platform_data wfx_spi_pdata = {
.file_fw = "wfm_wf200",
.file_pds = "wf200.pds",
@@ -199,9 +201,11 @@ static int wfx_spi_probe(struct spi_devi
if (!bus->gpio_reset) {
dev_warn(&func->dev, "try to load firmware anyway\n");
} else {
- gpiod_set_value(bus->gpio_reset, 0);
- udelay(100);
+ if (spi_get_device_id(func)->driver_data & WFX_RESET_INVERTED)
+ gpiod_toggle_active_low(bus->gpio_reset);
gpiod_set_value(bus->gpio_reset, 1);
+ udelay(100);
+ gpiod_set_value(bus->gpio_reset, 0);
udelay(2000);
}

@@ -243,14 +247,16 @@ static int wfx_spi_disconnect(struct spi
* stripped.
*/
static const struct spi_device_id wfx_spi_id[] = {
- { "wfx-spi", 0 },
+ { "wfx-spi", WFX_RESET_INVERTED },
+ { "wf200", 0 },
{ },
};
MODULE_DEVICE_TABLE(spi, wfx_spi_id);

#ifdef CONFIG_OF
static const struct of_device_id wfx_spi_of_match[] = {
- { .compatible = "silabs,wfx-spi" },
+ { .compatible = "silabs,wfx-spi", .data = (void *)WFX_RESET_INVERTED },
+ { .compatible = "silabs,wf200" },
{ },
};
MODULE_DEVICE_TABLE(of, wfx_spi_of_match);

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