From mboxrd@z Thu Jan 1 00:00:00 1970 From: Subject: [PATCHv3 1/7] EDAC, altera: Check parent status for Arria10 EDAC block Date: Mon, 13 Jun 2016 16:19:06 -0500 Message-ID: <1465852752-11018-2-git-send-email-tthayer@opensource.altera.com> References: <1465852752-11018-1-git-send-email-tthayer@opensource.altera.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1465852752-11018-1-git-send-email-tthayer-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org, dougthompson-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org, m.chehab-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, pawel.moll-5wv7dgnIgG8@public.gmane.org, mark.rutland-5wv7dgnIgG8@public.gmane.org, ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org, galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org, dinguyen-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org, grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-edac-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, tthayer.linux-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, tthayer-yzvPICuk2ABMcg4IHK0kFoH6Mc4MB0Vx@public.gmane.org List-Id: devicetree@vger.kernel.org From: Thor Thayer In preparation for the Arria10 ECC modules, check the status of the parent in the device tree to ensure the block is enabled. Skip if no parent phandle is set in the device tree. Signed-off-by: Thor Thayer --- v2 No change v3 Move check into validate_parent_available(). --- drivers/edac/altera_edac.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c index 6f5d586..926bcaf 100644 --- a/drivers/edac/altera_edac.c +++ b/drivers/edac/altera_edac.c @@ -1125,6 +1125,20 @@ static void altr_edac_a10_irq_handler(struct irq_desc *desc) chained_irq_exit(chip, desc); } +static int validate_parent_available(struct device_node *np) +{ + struct device_node *parent; + + /* Ensure parent device is enabled if parent node exists */ + parent = of_parse_phandle(np, "parent", 0); + if (parent && !of_device_is_available(parent)) { + of_node_put(parent); + return -ENODEV; + } + of_node_put(parent); + return 0; +} + static int altr_edac_a10_device_add(struct altr_arria10_edac *edac, struct device_node *np) { @@ -1146,6 +1160,9 @@ static int altr_edac_a10_device_add(struct altr_arria10_edac *edac, if (IS_ERR_OR_NULL(prv)) return -ENODEV; + if (validate_parent_available(np)) + return -ENODEV; + if (!devres_open_group(edac->dev, altr_edac_a10_device_add, GFP_KERNEL)) return -ENOMEM; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html