[U-Boot] [PATCH RFC] spi: mxs spi: DM conversion
Akash Gajjar
gajjar04akash at gmail.com
Tue Apr 10 12:34:24 UTC 2018
This is to announce that I have started working on DM driver support for
mxs spi driver that adds basic skeleton of DM driver functionality along with
legacy driver support.
This is compilation tested only.
Signed-off-by: Akash Gajjar <gajjar04akash at gmail.com>
---
drivers/spi/mxs_spi.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 74 insertions(+)
diff --git a/drivers/spi/mxs_spi.c b/drivers/spi/mxs_spi.c
index 790db78..94e9ab3 100644
--- a/drivers/spi/mxs_spi.c
+++ b/drivers/spi/mxs_spi.c
@@ -20,6 +20,9 @@
#include <asm/arch/imx-regs.h>
#include <asm/arch/sys_proto.h>
#include <asm/mach-imx/dma.h>
+#ifdef CONFIG_DM_SPI
+#include <dm.h>
+#endif
#define MXS_SPI_MAX_TIMEOUT 1000000
#define MXS_SPI_PORT_OFFSET 0x2000
@@ -361,3 +364,74 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
return mxs_spi_xfer_dma(mxs_slave, data, len, write, flags);
}
}
+
+#ifdef CONFIG_DM_SPI
+struct mxs_spi_priv {
+ struct spi_slave slave;
+ struct mxs_ssp_regs *regs;
+ u32 max_khz;
+ u32 mode;
+};
+
+struct mxs_spi_platdata {
+ struct spi_slave slave;
+ struct mxs_ssp_regs *regs;
+ u32 bus;
+};
+
+static int mxs_spi_claim_bus(struct udevice *dev)
+{
+ struct udevice *bus = dev->parent;
+ struct mxs_spi_platdata *plat = dev_get_platdata(bus);
+ struct mxs_ssp_regs *ssp_regs = plat->regs;
+ u32 reg = 0;
+
+ writel((slave->cs << MXS_SSP_CHIPSELECT_SHIFT) |
+ SSP_CTRL0_BUS_WIDTH_ONE_BIT,
+ &ssp_regs->hw_ssp_ctrl0);
+
+ return 0;
+}
+
+static int mxs_spi_release_bus(struct udevice *dev)
+{
+ return 0;
+}
+
+static int mxs_spi_xfer(struct udevice *dev, unsigned int bitlen,
+ const void *dout, void *din, unsigned long flags)
+{
+ return 0;
+}
+
+static int mxs_spi_set_speed(struct udevice *bus, uint speed)
+{
+ return 0;
+}
+
+static int mxs_spi_set_mode(struct udevice *bus, uint mode)
+{
+ return 0;
+}
+
+static int mxs_spi_probe(struct udevice *dev)
+{
+ return 0;
+}
+
+static const struct dm_spi_ops mxs_spi_ops = {
+ .claim_bus = mxs_spi_claim_bus,
+ .release_bus = mxs_spi_release_bus,
+ .xfer = mxs_spi_xfer,
+ .set_speed = mxs_spi_set_speed,
+ .set_mode = mxs_spi_set_mode,
+};
+
+U_BOOT_DRIVER(mxs_spi) = {
+ .name = "mxs_spi",
+ .id = UCLASS_SPI,
+ .ops = &mxs_spi_ops,
+ .priv_auto_alloc_size = sizeof(struct mxs_spi_priv),
+ .probe = mxs_spi_probe,
+};
+#endif
--
1.9.1
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