Hi Bin,
On Sun, 28 Jun 2020 at 19:27, Bin Meng bmeng.cn@gmail.com wrote:
Hi Simon,
On Sun, Jun 14, 2020 at 10:55 AM Simon Glass sjg@chromium.org wrote:
Add a function to write a SPI descriptor to the generated ACPI code.
Signed-off-by: Simon Glass sjg@chromium.org
Changes in v3:
- Make acpi_device_write_spi() static
- Add an extra comment about scope to acpi_device_set_spi()
- Use BIT() in a few places
- Resist the temptation to go to >80 characters
Changes in v2:
- Fix memset of SPI descriptor
drivers/spi/sandbox_spi.c | 11 ++++ include/acpi/acpi_device.h | 36 +++++++++++ include/spi.h | 4 +- lib/acpi/acpi_device.c | 124 +++++++++++++++++++++++++++++++++++++ test/dm/acpigen.c | 36 +++++++++++ 5 files changed, 209 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/sandbox_spi.c b/drivers/spi/sandbox_spi.c index b0a46c8868..4264acc953 100644 --- a/drivers/spi/sandbox_spi.c +++ b/drivers/spi/sandbox_spi.c @@ -21,6 +21,7 @@ #include <linux/errno.h> #include <asm/spi.h> #include <asm/state.h> +#include <dm/acpi.h> #include <dm/device-internal.h>
#ifndef CONFIG_SPI_IDLE_VAL @@ -133,6 +134,15 @@ static int sandbox_spi_get_mmap(struct udevice *dev, ulong *map_basep, return 0; }
+static int sandbox_spi_get_name(const struct udevice *dev, char *out_name) +{
return acpi_copy_name(out_name, "SSPI");+}
+struct acpi_ops sandbox_spi_acpi_ops = {
.get_name = sandbox_spi_get_name,+};
static const struct dm_spi_ops sandbox_spi_ops = { .xfer = sandbox_spi_xfer, .set_speed = sandbox_spi_set_speed, @@ -151,4 +161,5 @@ U_BOOT_DRIVER(spi_sandbox) = { .id = UCLASS_SPI, .of_match = sandbox_spi_ids, .ops = &sandbox_spi_ops,
ACPI_OPS_PTR(&sandbox_spi_acpi_ops)}; diff --git a/include/acpi/acpi_device.h b/include/acpi/acpi_device.h index f738b03d58..c0c96183e4 100644 --- a/include/acpi/acpi_device.h +++ b/include/acpi/acpi_device.h @@ -10,6 +10,7 @@ #define __ACPI_DEVICE_H
#include <i2c.h> +#include <spi.h> #include <linux/bitops.h>
struct acpi_ctx; @@ -207,6 +208,29 @@ struct acpi_i2c { const char *resource; };
+/**
- struct acpi_spi - representation of an ACPI SPI device
- @device_select: Chip select used by this device (typically 0)
- @device_select_polarity: Polarity for the device
- @wire_mode: Number of wires used for SPI
- @speed: Bus speed in Hz
- @data_bit_length: Word length for SPI (typically 8)
- @clock_phase: Clock phase to capture data
- @clock_polarity: Bus polarity
- @resource: Resource name for the SPI controller
- */
+struct acpi_spi {
u16 device_select;enum spi_polarity device_select_polarity;enum spi_wire_mode wire_mode;unsigned int speed;u8 data_bit_length;enum spi_clock_phase clock_phase;enum spi_polarity clock_polarity;const char *resource;+};
/**
- acpi_device_path() - Get the full path to an ACPI device
@@ -306,4 +330,16 @@ int acpi_device_write_interrupt_or_gpio(struct acpi_ctx *ctx, */ int acpi_device_write_i2c_dev(struct acpi_ctx *ctx, const struct udevice *dev);
+/**
- acpi_device_write_spi_dev() - Write a SPI device to ACPI
- This writes a serial bus descriptor for the SPI device so that ACPI can use
- it
- @ctx: ACPI context pointer
- @dev: SPI device to write
- @return 0 if OK, -ve on error
- */
+int acpi_device_write_spi_dev(struct acpi_ctx *ctx, const struct udevice *dev);
#endif diff --git a/include/spi.h b/include/spi.h index 5cc6d6e008..f34533f54e 100644 --- a/include/spi.h +++ b/include/spi.h @@ -13,8 +13,8 @@ #include <linux/bitops.h>
/* SPI mode flags */ -#define SPI_CPHA BIT(0) /* clock phase */ -#define SPI_CPOL BIT(1) /* clock polarity */ +#define SPI_CPHA BIT(0) /* clock phase (1 = SPI_CLOCK_PHASE_SECOND) */ +#define SPI_CPOL BIT(1) /* clock polarity (1 = SPI_POLARITY_HIGH) */ #define SPI_MODE_0 (0|0) /* (original MicroWire) */ #define SPI_MODE_1 (0|SPI_CPHA) #define SPI_MODE_2 (SPI_CPOL|0) diff --git a/lib/acpi/acpi_device.c b/lib/acpi/acpi_device.c index 40d1a82d27..38101c8b96 100644 --- a/lib/acpi/acpi_device.c +++ b/lib/acpi/acpi_device.c @@ -488,3 +488,127 @@ int acpi_device_write_i2c_dev(struct acpi_ctx *ctx, const struct udevice *dev)
return 0;}
+#ifdef CONFIG_SPI
Why #ifdef? Other APIs don't have this
This is due to the #ifdef in the spi.h header file. I sent you a patch to fix that for a different reason (APL not booting). So if that goes in we can drop this.
Regards, SImon