Re: [PATCH v2 4/8] spi: imx: add selection for iMX53 and iMX6 controller type
From: Jiada Wang
Date: Sun Oct 25 2015 - 23:27:20 EST
Hello
Subject: [PATCH v2 4/8] spi: imx: add selection for iMX53 and iMX6 controller type
ECSPI contorller for iMX53 and iMX6 has few hardware issues in slave
mode and (32*n+1) SPI word size handling comparing to iMX51.
The change add possibility to detect the SPI controller is use and apply
workarounds/limitations.
Documentation for device tree bindings updated
Signed-off-by: Anton Bondarenko <anton_bondarenko@xxxxxxxxxx>
---
.../devicetree/bindings/spi/fsl-imx-cspi.txt | 2 ++
drivers/spi/spi-imx.c | 36 ++++++++++++++++++++--
2 files changed, 35 insertions(+), 3 deletions(-)
diff --git a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
index 523341a..425485f 100644
--- a/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
+++ b/Documentation/devicetree/bindings/spi/fsl-imx-cspi.txt
@@ -9,6 +9,8 @@ Required properties:
- "fsl,imx31-cspi" for SPI compatible with the one integrated on i.MX31
- "fsl,imx35-cspi" for SPI compatible with the one integrated on i.MX35
- "fsl,imx51-ecspi" for SPI compatible with the one integrated on i.MX51
+ - "fsl,imx53-ecspi" for SPI compatible with the one integrated on i.MX53
+ - "fsl,imx6q-ecspi" for SPI compatible with the one integrated on i.MX6 family
- reg : Offset and length of the register set for the device
- interrupts : Should contain CSPI/eCSPI interrupt
- fsl,spi-num-chipselects : Contains the number of the chipselect
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index d9b730d..41c9cef 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -72,7 +72,8 @@ enum spi_imx_devtype {
IMX27_CSPI,
IMX31_CSPI,
IMX35_CSPI, /* CSPI on all i.mx except above */
- IMX51_ECSPI, /* ECSPI on i.mx51 and later */
+ IMX51_ECSPI, /* ECSPI on i.mx51 */
+ IMX53_ECSPI, /* ECSPI on i.mx53 and later */
};
struct spi_imx_data;
@@ -129,9 +130,20 @@ static inline int is_imx35_cspi(struct spi_imx_data *d)
return d->devtype_data->devtype == IMX35_CSPI;
}
+static inline int is_imx53_ecspi(struct spi_imx_data *d)
+{
+ return d->devtype_data->devtype == IMX53_ECSPI;
+}
+
+static inline int is_imx5x_ecspi(struct spi_imx_data *d)
+{
+ return d->devtype_data->devtype == IMX51_ECSPI ||
+ d->devtype_data->devtype == IMX53_ECSPI;
+}
+
static inline unsigned spi_imx_get_fifosize(struct spi_imx_data *d)
{
- return (d->devtype_data->devtype == IMX51_ECSPI) ? 64 : 8;
+ return is_imx5x_ecspi(d) ? 64 : 8;
}
#define MXC_SPI_BUF_RX(type) \
@@ -680,6 +692,16 @@ static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
.devtype = IMX51_ECSPI,
};
+static struct spi_imx_devtype_data imx53_ecspi_devtype_data = {
+ /* i.mx53 and later ecspi shares the functions with i.mx51 one */
+ .intctrl = mx51_ecspi_intctrl,
+ .config = mx51_ecspi_config,
+ .trigger = mx51_ecspi_trigger,
+ .rx_available = mx51_ecspi_rx_available,
+ .reset = mx51_ecspi_reset,
+ .devtype = IMX53_ECSPI,
+};
+
static const struct platform_device_id spi_imx_devtype[] = {
{
.name = "imx1-cspi",
@@ -697,6 +719,12 @@ static const struct platform_device_id spi_imx_devtype[] = {
.name = "imx35-cspi",
.driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data,
}, {
+ .name = "imx53-ecspi",
+ .driver_data = (kernel_ulong_t)&imx53_ecspi_devtype_data,
+ }, {
+ .name = "imx6q-ecspi",
+ .driver_data = (kernel_ulong_t)&imx53_ecspi_devtype_data,
+ }, {
.name = "imx51-ecspi",
.driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data,
}, {
@@ -710,6 +738,8 @@ static const struct of_device_id spi_imx_dt_ids[] = {
{ .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
{ .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
{ .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
+ { .compatible = "fsl,imx53-ecspi", .data = &imx53_ecspi_devtype_data, },
+ { .compatible = "fsl,imx6q-ecspi", .data = &imx53_ecspi_devtype_data, },
{ .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
{ /* sentinel */ }
};
@@ -1299,7 +1329,7 @@ static int spi_imx_probe(struct platform_device *pdev)
* Only validated on i.mx6 now, can remove the constrain if validated on
* other chips.
*/
- if (spi_imx->devtype_data == &imx51_ecspi_devtype_data &&
+ if (is_imx5x_ecspi(spi_imx) &&
spi_imx_sdma_init(&pdev->dev, spi_imx, master))
dev_err(&pdev->dev, "dma setup error,use pio instead\n");
With this patch, there will still be issues with SPI controller on imx6
soc other than imx6q,
for example SPI controller on imx6sl has compatibility
"compatible = "fsl,imx6sl-ecspi", "fsl,imx51-ecspi";"
So I would suggest to update device-tree file,
for example
imx53.dtsi
"fsl,imx53-ecspi", "fsl,imx51-ecspi"; -> "fsl,imx53-ecspi";
imx6qdl.dtsi
compatible = "fsl,imx6q-ecspi", "fsl,imx51-ecspi"; -> compatible =
"fsl,imx6q-ecspi", "fsl,imx53-ecspi";
imx6sl.dtsi
compatible = "fsl,imx6sl-ecspi", "fsl,imx51-ecspi"; -> compatible =
"fsl,imx6sl-ecspi", "fsl,imx53-ecspi";
etc...
by doing this, then only compatible string "fsl,imx53-ecspi" need to be
added in driver code.
Thanks,
Jiada
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/