Hi Geert,
On 06/12/2017 04:18 PM, Geert Uytterhoeven wrote:
On Mon, Jun 12, 2017 at 9:15 AM, Shawn Lin <shawn.lin@xxxxxxxxxxxxxx> wrote:
On 2017/6/12 14:14, Jeffy Chen wrote:
Support using "cs-gpios" property to specify cs gpios.
Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
index 83da493..02171b2 100644
--- a/Documentation/devicetree/bindings/spi/spi-rockchip.txt
+++ b/Documentation/devicetree/bindings/spi/spi-rockchip.txt
@@ -17,6 +17,7 @@ Required Properties:
region.
- interrupts: The interrupt number to the cpu. The interrupt specifier
format
depends on the interrupt controller.
+- cs-gpios : Specifies the gpio pins to be used for chipselects.
It's not a required property, otherwise how other boards work as your
patch 2 only add this for rk3399-gru.
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -297,6 +302,50 @@ static void rockchip_spi_set_cs(struct spi_device
*spi, bool enable)
pm_runtime_put_sync(rs->dev);
}
+static int rockchip_spi_setup(struct spi_device *spi)
+{
+ int ret = 0;
+ unsigned long flags = (spi->mode & SPI_CS_HIGH) ?
+ GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH;
+ struct rockchip_spi_data *data = spi_get_ctldata(spi);
+
+ if (!gpio_is_valid(spi->cs_gpio))
+ return 0;
return -EINVAL?
Isn't this check meant to fall back to hardware CS if no cs-gpios property
is present?
Thanks for your comment, and yes it is. I'll add a comment in the code
to explain it :)
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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