diff options
Diffstat (limited to 'target/linux/layerscape/patches-4.9/820-base-soc-Introduce-soc_device_match-interface.patch')
| -rw-r--r-- | target/linux/layerscape/patches-4.9/820-base-soc-Introduce-soc_device_match-interface.patch | 162 |
1 files changed, 0 insertions, 162 deletions
diff --git a/target/linux/layerscape/patches-4.9/820-base-soc-Introduce-soc_device_match-interface.patch b/target/linux/layerscape/patches-4.9/820-base-soc-Introduce-soc_device_match-interface.patch deleted file mode 100644 index ec9e26191f..0000000000 --- a/target/linux/layerscape/patches-4.9/820-base-soc-Introduce-soc_device_match-interface.patch +++ /dev/null @@ -1,162 +0,0 @@ -From c97db7cc7778e34a53b42d58c766f0ec0e30d580 Mon Sep 17 00:00:00 2001 -From: Arnd Bergmann <arnd@arndb.de> -Date: Wed, 21 Sep 2016 14:57:19 +0800 -Subject: [PATCH] base: soc: Introduce soc_device_match() interface - -We keep running into cases where device drivers want to know the exact -version of the a SoC they are currently running on. In the past, this has -usually been done through a vendor specific API that can be called by a -driver, or by directly accessing some kind of version register that is -not part of the device itself but that belongs to a global register area -of the chip. - -Common reasons for doing this include: - -- A machine is not using devicetree or similar for passing data about - on-chip devices, but just announces their presence using boot-time - platform devices, and the machine code itself does not care about the - revision. - -- There is existing firmware or boot loaders with existing DT binaries - with generic compatible strings that do not identify the particular - revision of each device, but the driver knows which SoC revisions - include which part. - -- A prerelease version of a chip has some quirks and we are using the same - version of the bootloader and the DT blob on both the prerelease and the - final version. An update of the DT binding seems inappropriate because - that would involve maintaining multiple copies of the dts and/or - bootloader. - -This patch introduces the soc_device_match() interface that is meant to -work like of_match_node() but instead of identifying the version of a -device, it identifies the SoC itself using a vendor-agnostic interface. - -Unlike of_match_node(), we do not do an exact string compare but instead -use glob_match() to allow wildcards in strings. - -Signed-off-by: Arnd Bergmann <arnd@arndb.de> -Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> -Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> -Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - drivers/base/Kconfig | 1 + - drivers/base/soc.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++ - include/linux/sys_soc.h | 3 +++ - 3 files changed, 70 insertions(+) - -diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig -index fdf44cac08e6..991b21e1f89b 100644 ---- a/drivers/base/Kconfig -+++ b/drivers/base/Kconfig -@@ -235,6 +235,7 @@ config GENERIC_CPU_AUTOPROBE - - config SOC_BUS - bool -+ select GLOB - - source "drivers/base/regmap/Kconfig" - -diff --git a/drivers/base/soc.c b/drivers/base/soc.c -index 028cef377fd4..04ee597fc3a3 100644 ---- a/drivers/base/soc.c -+++ b/drivers/base/soc.c -@@ -13,6 +13,7 @@ - #include <linux/spinlock.h> - #include <linux/sys_soc.h> - #include <linux/err.h> -+#include <linux/glob.h> - - static DEFINE_IDA(soc_ida); - -@@ -168,3 +169,68 @@ static int __init soc_bus_register(void) - return bus_register(&soc_bus_type); - } - core_initcall(soc_bus_register); -+ -+static int soc_device_match_one(struct device *dev, void *arg) -+{ -+ struct soc_device *soc_dev = container_of(dev, struct soc_device, dev); -+ const struct soc_device_attribute *match = arg; -+ -+ if (match->machine && -+ !glob_match(match->machine, soc_dev->attr->machine)) -+ return 0; -+ -+ if (match->family && -+ !glob_match(match->family, soc_dev->attr->family)) -+ return 0; -+ -+ if (match->revision && -+ !glob_match(match->revision, soc_dev->attr->revision)) -+ return 0; -+ -+ if (match->soc_id && -+ !glob_match(match->soc_id, soc_dev->attr->soc_id)) -+ return 0; -+ -+ return 1; -+} -+ -+/* -+ * soc_device_match - identify the SoC in the machine -+ * @matches: zero-terminated array of possible matches -+ * -+ * returns the first matching entry of the argument array, or NULL -+ * if none of them match. -+ * -+ * This function is meant as a helper in place of of_match_node() -+ * in cases where either no device tree is available or the information -+ * in a device node is insufficient to identify a particular variant -+ * by its compatible strings or other properties. For new devices, -+ * the DT binding should always provide unique compatible strings -+ * that allow the use of of_match_node() instead. -+ * -+ * The calling function can use the .data entry of the -+ * soc_device_attribute to pass a structure or function pointer for -+ * each entry. -+ */ -+const struct soc_device_attribute *soc_device_match( -+ const struct soc_device_attribute *matches) -+{ -+ int ret = 0; -+ -+ if (!matches) -+ return NULL; -+ -+ while (!ret) { -+ if (!(matches->machine || matches->family || -+ matches->revision || matches->soc_id)) -+ break; -+ ret = bus_for_each_dev(&soc_bus_type, NULL, (void *)matches, -+ soc_device_match_one); -+ if (!ret) -+ matches++; -+ else -+ return matches; -+ } -+ return NULL; -+} -+EXPORT_SYMBOL_GPL(soc_device_match); -diff --git a/include/linux/sys_soc.h b/include/linux/sys_soc.h -index 2739ccb69571..9f5eb06f9fd8 100644 ---- a/include/linux/sys_soc.h -+++ b/include/linux/sys_soc.h -@@ -13,6 +13,7 @@ struct soc_device_attribute { - const char *family; - const char *revision; - const char *soc_id; -+ const void *data; - }; - - /** -@@ -34,4 +35,6 @@ void soc_device_unregister(struct soc_device *soc_dev); - */ - struct device *soc_device_to_device(struct soc_device *soc); - -+const struct soc_device_attribute *soc_device_match( -+ const struct soc_device_attribute *matches); - #endif /* __SOC_BUS_H */ --- -2.11.1 - |