Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756434Ab3JGQal (ORCPT ); Mon, 7 Oct 2013 12:30:41 -0400 Received: from mail-ye0-f171.google.com ([209.85.213.171]:50525 "EHLO mail-ye0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756407Ab3JGQaf (ORCPT ); Mon, 7 Oct 2013 12:30:35 -0400 From: Rob Herring To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Cc: Grant Likely , Rob Herring Subject: [PATCH v2 24/29] of: introduce common FDT machine related functions Date: Mon, 7 Oct 2013 11:29:32 -0500 Message-Id: <1381163377-21044-25-git-send-email-robherring2@gmail.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1381163377-21044-1-git-send-email-robherring2@gmail.com> References: <1381163377-21044-1-git-send-email-robherring2@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3526 Lines: 112 From: Rob Herring Introduce common of_flat_dt_match_machine and of_flat_dt_get_machine_name functions to unify architectures' handling of machine level model and compatible properties. Several architectures match the root compatible string with an arch specific list of machine descriptors duplicating the same search algorithm. Create a common implementation with a simple architecture specific hook to iterate over each machine's match table. Signed-off-by: Rob Herring Acked-by: Grant Likely --- drivers/of/fdt.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/of_fdt.h | 4 ++++ 2 files changed, 64 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 5f4cc88..5c47910 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -619,6 +619,66 @@ int __init of_scan_flat_dt_by_path(const char *path, return ret; } +const char * __init of_flat_dt_get_machine_name(void) +{ + const char *name; + unsigned long dt_root = of_get_flat_dt_root(); + + name = of_get_flat_dt_prop(dt_root, "model", NULL); + if (!name) + name = of_get_flat_dt_prop(dt_root, "compatible", NULL); + return name; +} + +/** + * of_flat_dt_match_machine - Iterate match tables to find matching machine. + * + * @default_match: A machine specific ptr to return in case of no match. + * @get_next_compat: callback function to return next compatible match table. + * + * Iterate through machine match tables to find the best match for the machine + * compatible string in the FDT. + */ +const void * __init of_flat_dt_match_machine(const void *default_match, + const void * (*get_next_compat)(const char * const**)) +{ + const void *data = NULL; + const void *best_data = default_match; + const char *const *compat; + unsigned long dt_root; + unsigned int best_score = ~1, score = 0; + + dt_root = of_get_flat_dt_root(); + while ((data = get_next_compat(&compat))) { + score = of_flat_dt_match(dt_root, compat); + if (score > 0 && score < best_score) { + best_data = data; + best_score = score; + } + } + if (!best_data) { + const char *prop; + long size; + + pr_err("\n unrecognized device tree list:\n[ "); + + prop = of_get_flat_dt_prop(dt_root, "compatible", &size); + if (prop) { + while (size > 0) { + printk("'%s' ", prop); + size -= strlen(prop) + 1; + prop += strlen(prop) + 1; + } + } + printk("]\n\n"); + return NULL; + } + + pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); + + return best_data; +} + #ifdef CONFIG_BLK_DEV_INITRD /** * early_init_dt_check_for_initrd - Decode initrd location from flat tree diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h index b365f5a..dfaa1de 100644 --- a/include/linux/of_fdt.h +++ b/include/linux/of_fdt.h @@ -108,6 +108,10 @@ extern int early_init_dt_scan_root(unsigned long node, const char *uname, extern bool early_init_dt_scan(void *params); +extern const char *of_flat_dt_get_machine_name(void); +extern const void *of_flat_dt_match_machine(const void *default_match, + const void * (*get_next_compat)(const char * const**)); + /* Other Prototypes */ extern void unflatten_device_tree(void); extern void unflatten_and_copy_device_tree(void); -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/