[U-Boot] [U-Boot PATCH v2 12/17] spi: zynq_spi: Add fdt support in driver

Jagan Teki
2015-05-10T15:15:52Z

Now zynq spi driver platform data is controlled by devicetree,
enable the status by saying "okay" on respective board dts to use
the devicetree generated platdata.

Ex:
&spi1 {
status = "okay";
};

Signed-off-by: Jagan Teki <jteki@openedev.com>
Acked-by: Simon Glass <sjg@chromium.org>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
---
arch/arm/dts/zynq-7000.dtsi | 2 ++
doc/device-tree-bindings/spi/spi-zynq.txt | 2 ++
drivers/spi/zynq_spi.c | 23 +++++++++++++----------
3 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/arch/arm/dts/zynq-7000.dtsi b/arch/arm/dts/zynq-7000.dtsi
index f66f8dc..9207159 100644
--- a/arch/arm/dts/zynq-7000.dtsi
+++ b/arch/arm/dts/zynq-7000.dtsi
@@ -117,6 +117,7 @@
interrupts = <0 26 4>;
clocks = <&clkc 25>, <&clkc 34>;
clock-names = "ref_clk", "pclk";
+ spi-max-frequency = <166666700>;
#address-cells = <1>;
#size-cells = <0>;
};
@@ -129,6 +130,7 @@
interrupts = <0 49 4>;
clocks = <&clkc 26>, <&clkc 35>;
clock-names = "ref_clk", "pclk";
+ spi-max-frequency = <166666700>;
#address-cells = <1>;
#size-cells = <0>;
};
diff --git a/doc/device-tree-bindings/spi/spi-zynq.txt b/doc/device-tree-bindings/spi/spi-zynq.txt
index a7c2757..f397a36 100644
--- a/doc/device-tree-bindings/spi/spi-zynq.txt
+++ b/doc/device-tree-bindings/spi/spi-zynq.txt
@@ -11,6 +11,7 @@ Required properties:
- clocks : Clock phandles (see clock bindings for details).
- clock-names : List of input clock names - "ref_clk", "pclk"
(See clock bindings for details).
+- spi-max-frequency : Maximum SPI clocking speed of device in Hz

Example:

@@ -22,6 +23,7 @@ Example:
interrupts = <0 26 4>;
clocks = <&clkc 25>, <&clkc 34>;
clock-names = "ref_clk", "pclk";
+ spi-max-frequency = <166666700>;
#address-cells = <1>;
#size-cells = <0>;
} ;
diff --git a/drivers/spi/zynq_spi.c b/drivers/spi/zynq_spi.c
index 6cc6db9..4691ad5 100644
--- a/drivers/spi/zynq_spi.c
+++ b/drivers/spi/zynq_spi.c
@@ -13,9 +13,12 @@
#include <errno.h>
#include <malloc.h>
#include <spi.h>
+#include <fdtdec.h>
#include <asm/io.h>
#include <asm/arch/hardware.h>

+DECLARE_GLOBAL_DATA_PTR;
+
/* zynq spi register bit masks ZYNQ_SPI_<REG>_<BIT>_MASK */
#define ZYNQ_SPI_CR_MSA_MASK (1 << 15) /* Manual start enb */
#define ZYNQ_SPI_CR_MCS_MASK (1 << 14) /* Manual chip select */
@@ -64,22 +67,22 @@ struct zynq_spi_priv {
u32 freq; /* required frequency */
};

-static inline struct zynq_spi_regs *get_zynq_spi_regs(struct udevice *bus)
-{
- if (bus->seq)
- return (struct zynq_spi_regs *)ZYNQ_SPI_BASEADDR1;
- else
- return (struct zynq_spi_regs *)ZYNQ_SPI_BASEADDR0;
-}
-
static int zynq_spi_ofdata_to_platdata(struct udevice *bus)
{
struct zynq_spi_platdata *plat = bus->platdata;
+ const void *blob = gd->fdt_blob;
+ int node = bus->of_offset;
+
+ plat->regs = (struct zynq_spi_regs *)fdtdec_get_addr(blob, node, "reg");

- plat->regs = get_zynq_spi_regs(bus);
- plat->frequency = 166666700;
+ /* FIXME: Use 250MHz as a suitable default */
+ plat->frequency = fdtdec_get_int(blob, node, "spi-max-frequency",
+ 250000000);
plat->speed_hz = plat->frequency / 2;

+ debug("zynq_spi_ofdata_to_platdata: regs=%p max-frequency=%d\n",
+ plat->regs, plat->frequency);
+
return 0;
}

--
1.9.1