MXC: Fix byte-ordering in SPI driver for i.MX31/i.MX51
The actual SPI driver for i.MX31 and i.MX51 controller
use a wrong byte ordering, because it is supposed
to work only with Freescale's devices, as the Power
Controllers (PMIC). The driver is not suitable for
general purposes, because the buffers passed to spi_xfer
must be 32-bit aligned, as it is used mainly to send
integer to PMIC devices.
The patch drops any kind of limitation and makes the
driver useful with devices controlled sending commands
composed by single bytes (or by a odd number of bytes), such as
spi flash, sensor, etc.
Because the byte ordering is changed,
any current driver using this controller must be adapted, too.
Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/drivers/misc/fsl_pmic.c b/drivers/misc/fsl_pmic.c
index dca0a1d..5ee1de1 100644
--- a/drivers/misc/fsl_pmic.c
+++ b/drivers/misc/fsl_pmic.c
@@ -46,6 +46,7 @@
u32 pmic_reg(u32 reg, u32 val, u32 write)
{
u32 pmic_tx, pmic_rx;
+ u32 tmp;
if (!slave) {
slave = pmic_spi_probe();
@@ -65,7 +66,9 @@
pmic_tx = (write << 31) | (reg << 25) | (val & 0x00FFFFFF);
- if (spi_xfer(slave, 4 << 3, &pmic_tx, &pmic_rx,
+ tmp = cpu_to_be32(pmic_tx);
+
+ if (spi_xfer(slave, 4 << 3, &tmp, &pmic_rx,
SPI_XFER_BEGIN | SPI_XFER_END)) {
spi_release_bus(slave);
return -1;
@@ -73,7 +76,8 @@
if (write) {
pmic_tx &= ~(1 << 31);
- if (spi_xfer(slave, 4 << 3, &pmic_tx, &pmic_rx,
+ tmp = cpu_to_be32(pmic_tx);
+ if (spi_xfer(slave, 4 << 3, &tmp, &pmic_rx,
SPI_XFER_BEGIN | SPI_XFER_END)) {
spi_release_bus(slave);
return -1;
@@ -81,7 +85,7 @@
}
spi_release_bus(slave);
- return pmic_rx;
+ return cpu_to_be32(pmic_rx);
}
void pmic_reg_write(u32 reg, u32 value)