On Mon, 29 Jun 2020 at 22:38, Dave Gerlach d-gerlach@ti.com wrote:
Introduce UCLASS_SOC to be used for SOC identification and attribute matching based on the SoC ID info. This allows drivers to be provided for SoCs to retrieve SoC identifying information and also for matching device attributes for selecting SoC specific data.
This is useful for other device drivers that may need different parameters or quirks enabled depending on the specific device variant in use.
Signed-off-by: Dave Gerlach d-gerlach@ti.com
drivers/soc/Kconfig | 9 +++ drivers/soc/Makefile | 1 + drivers/soc/soc-uclass.c | 102 ++++++++++++++++++++++++++++++ include/dm/uclass-id.h | 1 + include/soc.h | 132 +++++++++++++++++++++++++++++++++++++++ 5 files changed, 245 insertions(+) create mode 100644 drivers/soc/soc-uclass.c create mode 100644 include/soc.h
Reviewed-by: Simon Glass sjg@chromium.org
As Tom says, docs please but looks great otherwise.
Nits below. Do you think it might make sense to have an integer-encoded version? Maybe it would be more hassle than it is worth.
diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index 7b4e4d613088..e715dfd01712 100644 --- a/drivers/soc/Kconfig +++ b/drivers/soc/Kconfig @@ -1,5 +1,14 @@ menu "SOC (System On Chip) specific Drivers"
+config SOC_DEVICE
bool "Enable SoC Device ID drivers using Driver Model"helpThis allows drivers to be provided for SoCs to help in identifyingthe SoC in use and matching SoC attributes for selecting SoCspecific data. This is useful for other device drivers that mayneed different parameters or quirks enabled depending on thespecific device variant in use.source "drivers/soc/ti/Kconfig"
endmenu diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index ce253b7aa886..1c09a8465670 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -3,3 +3,4 @@ # Makefile for the U-Boot SOC specific device drivers.
obj-$(CONFIG_SOC_TI) += ti/ +obj-$(CONFIG_SOC_DEVICE) += soc-uclass.o diff --git a/drivers/soc/soc-uclass.c b/drivers/soc/soc-uclass.c new file mode 100644 index 000000000000..22f89514ed7d --- /dev/null +++ b/drivers/soc/soc-uclass.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0+ +/*
- (C) Copyright 2020 - Texas Instruments Incorporated - http://www.ti.com/
Dave Gerlach <d-gerlach@ti.com>- */
+#include <common.h> +#include <soc.h> +#include <dm.h> +#include <errno.h> +#include <dm/lists.h> +#include <dm/root.h>
+int soc_get(struct udevice **devp) +{
return uclass_first_device_err(UCLASS_SOC, devp);+}
+int soc_get_machine(struct udevice *dev, char *buf, int size) +{
struct soc_ops *ops = soc_get_ops(dev);if (!ops->get_machine)return -ENOSYS;return ops->get_machine(dev, buf, size);+}
+int soc_get_family(struct udevice *dev, char *buf, int size) +{
struct soc_ops *ops = soc_get_ops(dev);if (!ops->get_family)return -ENOSYS;return ops->get_family(dev, buf, size);+}
+int soc_get_revision(struct udevice *dev, char *buf, int size) +{
struct soc_ops *ops = soc_get_ops(dev);if (!ops->get_revision)return -ENOSYS;return ops->get_revision(dev, buf, size);+}
+const struct soc_device_attribute * +soc_device_match(const struct soc_device_attribute *matches) +{
bool match;struct udevice *soc;char str[SOC_MAX_STR_SIZE];if (!matches)return NULL;if (soc_get(&soc))return NULL;while (1) {if (!(matches->machine || matches->family ||matches->revision))break;match = true;if (matches->machine) {if (!soc_get_machine(soc, str, SOC_MAX_STR_SIZE)) {if (strcmp(matches->machine, str))match = false;}}if (matches->family) {if (!soc_get_family(soc, str, SOC_MAX_STR_SIZE)) {if (strcmp(matches->family, str))match = false;}}if (matches->revision) {if (!soc_get_revision(soc, str, SOC_MAX_STR_SIZE)) {if (strcmp(matches->revision, str))match = false;}}if (match)return matches;matches++;}return NULL;+}
+UCLASS_DRIVER(soc) = {
.id = UCLASS_SOC,.name = "soc",+}; diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index 7837d459f18c..690a8ed4df49 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -97,6 +97,7 @@ enum uclass_id { UCLASS_SERIAL, /* Serial UART */ UCLASS_SIMPLE_BUS, /* Bus with child devices */ UCLASS_SMEM, /* Shared memory interface */
UCLASS_SOC, /* SOC Device */ UCLASS_SOUND, /* Playing simple sounds */ UCLASS_SPI, /* SPI bus */ UCLASS_SPI_FLASH, /* SPI flash */diff --git a/include/soc.h b/include/soc.h new file mode 100644 index 000000000000..98e3cc000198 --- /dev/null +++ b/include/soc.h @@ -0,0 +1,132 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/*
- (C) Copyright 2020 - Texas Instruments Incorporated - http://www.ti.com/
Dave Gerlach <d-gerlach@ti.com>- */
+#ifndef __SOC_H +#define __SOC_H
+#define SOC_MAX_STR_SIZE 128
+struct soc_device_attribute {
Could this be soc_attr or maybe soc_dev_attr? This is too long.
const char *machine;const char *family;const char *revision;const void *data;
Please can you comment this struct with what each thing means and an example for your SoC.
+};
+#ifdef CONFIG_SOC_DEVICE
Please drop the #ifdef as there is no harm in defining this.
+struct soc_ops {
/*** get_machine() - Get machine name of an SOC** @dev: Device to check (UCLASS_SOC)* @buf: Buffer to place string* @size: Size of string space* @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error*/int (*get_machine)(struct udevice *dev, char *buf, int size);/*** get_revision() - Get revision name of a SOC** @dev: Device to check (UCLASS_SOC)* @buf: Buffer to place string* @size: Size of string space* @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error*/int (*get_revision)(struct udevice *dev, char *buf, int size);/*** get_family() - Get family name of an SOC** @dev: Device to check (UCLASS_SOC)* @buf: Buffer to place string* @size: Size of string space* @return 0 if OK, -ENOSPC if buffer is too small, other -ve on error*/int (*get_family)(struct udevice *dev, char *buf, int size);+};
+#define soc_get_ops(dev) ((struct soc_ops *)(dev)->driver->ops)
+/**
- soc_get() - Return the soc device for the soc in use.
- @devp: Pointer to structure to receive the soc device.
- Since there can only be at most one SOC instance, the API can supply a
- function that returns the unique device.
- Return: 0 if OK, -ve on error.
- */
+int soc_get(struct udevice **devp);
+/**
- soc_get_machine() - Get machine name of an SOC
- @dev: Device to check (UCLASS_SOC)
- @buf: Buffer to place string
- @size: Size of string space
- Return: 0 if OK, -ENOSPC if buffer is too small, other -ve on error
- */
+int soc_get_machine(struct udevice *dev, char *buf, int size);
+/**
- soc_get_revision() - Get revision name of an SOC
- @dev: Device to check (UCLASS_SOC)
- @buf: Buffer to place string
- @size: Size of string space
- Return: 0 if OK, -ENOSPC if buffer is too small, other -ve on error
- */
+int soc_get_revision(struct udevice *dev, char *buf, int size);
+/**
- soc_get_family() - Get family name of an SOC
- @dev: Device to check (UCLASS_SOC)
- @buf: Buffer to place string
- @size: Size of string space
- Return: 0 if OK, -ENOSPC if buffer is too small, other -ve on error
- */
+int soc_get_family(struct udevice *dev, char *buf, int size);
+/**
- soc_device_match() - Return match from an array of soc_device_attribute
- @matches: Array with any combination of family, revision or machine set
- Return: Pointer to struct from matches array with set attributes matching
those provided by the soc device.
or NULL ?
- */
+const struct soc_device_attribute * +soc_device_match(const struct soc_device_attribute *matches);
+#else +static inline int soc_get(struct udevice **devp) +{
return -ENOSYS;+}
+static inline int soc_get_machine(struct udevice *dev, char *buf, int size) +{
return -ENOSYS;+}
+static inline int soc_get_revision(struct udevice *dev, char *buf, int size) +{
return -ENOSYS;+}
+static inline int soc_get_family(struct udevice *dev, char *buf, int size) +{
return -ENOSYS;+}
+static inline const struct soc_device_attribute * +soc_device_match(const struct soc_device_attribute *matches) +{
return NULL;+} +#endif
+#endif /* _SOC_H */
2.20.1
Regards, Simon