From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 90138C0650E for ; Mon, 1 Jul 2019 06:21:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 695A4217F4 for ; Mon, 1 Jul 2019 06:21:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561962060; bh=StqomvvpXflnRhDKL1dnp4Cn8wLcNE+ioYBf5EJMvSU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=I24i8D3lfuqNXFnFP3pjYYnG7f1ThEqomdvDvlt2buLQU4tHHiWhImGHnPVXes44E laZXrPbs9VWlJpbOI68kOZYuuGKmWGNbyWa/TC8JEWN5lfjTpTmNP20z7/iBiCJe7J 90XwFQ8XSql1UT4207A2brH52wJWS6tK+UbYx4Qs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727691AbfGAGU7 (ORCPT ); Mon, 1 Jul 2019 02:20:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:56178 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727659AbfGAGU4 (ORCPT ); Mon, 1 Jul 2019 02:20:56 -0400 Received: from localhost (unknown [122.167.76.109]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 05D3C20B7C; Mon, 1 Jul 2019 06:20:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561962055; bh=StqomvvpXflnRhDKL1dnp4Cn8wLcNE+ioYBf5EJMvSU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Qhdnkx3NMl/OHo0W8jfSJlvavK54m9wt+kzowzosr+VKbbTez0psR/3NasyeR6f0v MlPxTCL58hYRS1tO+jFj0z7MK3WIXILIEkzL8Id+8R112wvw26PTCMX0ZQix5pGYay PiCd+55IRc/33wtU7duuPBEEiHt+/+7EtYec9C74= Date: Mon, 1 Jul 2019 11:47:45 +0530 From: Vinod Koul To: Srinivas Kandagatla Cc: broonie@kernel.org, robh+dt@kernel.org, devicetree@vger.kernel.org, mark.rutland@arm.com, pierre-louis.bossart@linux.intel.com, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, bgoswami@quicinc.com Subject: Re: [RFC PATCH 2/5] soundwire: core: add device tree support for slave devices Message-ID: <20190701061745.GK2911@vkoul-mobl> References: <20190611104043.22181-1-srinivas.kandagatla@linaro.org> <20190611104043.22181-3-srinivas.kandagatla@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190611104043.22181-3-srinivas.kandagatla@linaro.org> User-Agent: Mutt/1.11.3 (2019-02-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11-06-19, 11:40, Srinivas Kandagatla wrote: > This patch adds support to parsing device tree based > SoundWire slave devices. > > Signed-off-by: Srinivas Kandagatla > --- > drivers/soundwire/bus.c | 2 +- > drivers/soundwire/bus.h | 1 + > drivers/soundwire/slave.c | 54 ++++++++++++++++++++++++++++++++++++++- > 3 files changed, 55 insertions(+), 2 deletions(-) > > diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c > index fe745830a261..20f26cf4ba74 100644 > --- a/drivers/soundwire/bus.c > +++ b/drivers/soundwire/bus.c > @@ -78,7 +78,7 @@ int sdw_add_bus_master(struct sdw_bus *bus) > if (IS_ENABLED(CONFIG_ACPI) && ACPI_HANDLE(bus->dev)) > ret = sdw_acpi_find_slaves(bus); > else > - ret = -ENOTSUPP; /* No ACPI/DT so error out */ > + ret = sdw_of_find_slaves(bus); > > if (ret) { > dev_err(bus->dev, "Finding slaves failed:%d\n", ret); > diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h > index 3048ca153f22..ee46befedbd1 100644 > --- a/drivers/soundwire/bus.h > +++ b/drivers/soundwire/bus.h > @@ -15,6 +15,7 @@ static inline int sdw_acpi_find_slaves(struct sdw_bus *bus) > } > #endif > > +int sdw_of_find_slaves(struct sdw_bus *bus); > void sdw_extract_slave_id(struct sdw_bus *bus, > u64 addr, struct sdw_slave_id *id); > > diff --git a/drivers/soundwire/slave.c b/drivers/soundwire/slave.c > index f39a5815e25d..6e7f5cfeb854 100644 > --- a/drivers/soundwire/slave.c > +++ b/drivers/soundwire/slave.c > @@ -2,6 +2,7 @@ > // Copyright(c) 2015-17 Intel Corporation. > > #include > +#include > #include > #include > #include "bus.h" > @@ -28,13 +29,14 @@ static int sdw_slave_add(struct sdw_bus *bus, > slave->dev.parent = bus->dev; > slave->dev.fwnode = fwnode; > > - /* name shall be sdw:link:mfg:part:class:unique */ > + /* name shall be sdw:link:mfg:part:class */ nope we are not changing dev_set_name below so this comment should not be modified > dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x:%x", > bus->link_id, id->mfg_id, id->part_id, > id->class_id, id->unique_id); > > slave->dev.release = sdw_slave_release; > slave->dev.bus = &sdw_bus_type; > + slave->dev.of_node = of_node_get(to_of_node(fwnode)); > slave->bus = bus; > slave->status = SDW_SLAVE_UNATTACHED; > slave->dev_num = 0; > @@ -112,3 +114,53 @@ int sdw_acpi_find_slaves(struct sdw_bus *bus) > } > > #endif > + > +#if IS_ENABLED(CONFIG_OF) > +/* > + * sdw_of_find_slaves() - Find Slave devices in master device tree node > + * @bus: SDW bus instance > + * > + * Scans Master DT node for SDW child Slave devices and registers it. > + */ > +int sdw_of_find_slaves(struct sdw_bus *bus) > +{ > + struct device *dev = bus->dev; > + struct device_node *node; > + > + if (!bus->dev->of_node) > + return 0; this should be error, otherwise next condition of checking slaves wont be triggered.. > + > + for_each_child_of_node(bus->dev->of_node, node) { > + struct sdw_slave_id id; > + const char *compat = NULL; > + int unique_id, ret; > + int ver, mfg_id, part_id, class_id; > + compat = of_get_property(node, "compatible", NULL); > + if (!compat) > + continue; > + > + ret = sscanf(compat, "sdw%x,%x,%x,%x", > + &ver, &mfg_id, &part_id, &class_id); > + if (ret != 4) { > + dev_err(dev, "Manf ID & Product code not found %s\n", > + compat); > + continue; > + } > + > + ret = of_property_read_u32(node, "sdw-instance-id", &unique_id); > + if (ret) { > + dev_err(dev, "Instance id not found:%d\n", ret); > + continue; > + } > + > + id.sdw_version = ver - 0xF; > + id.unique_id = unique_id; > + id.mfg_id = mfg_id; > + id.part_id = part_id; > + id.class_id = class_id; > + sdw_slave_add(bus, &id, of_fwnode_handle(node)); > + } > + return 0; > +} > + > +#endif > -- > 2.21.0 -- ~Vinod