From patchwork Thu Mar 24 23:43:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 553957 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01FC7C433FE for ; Thu, 24 Mar 2022 23:43:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356452AbiCXXpX (ORCPT ); Thu, 24 Mar 2022 19:45:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52440 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356444AbiCXXpW (ORCPT ); Thu, 24 Mar 2022 19:45:22 -0400 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59F615D189; Thu, 24 Mar 2022 16:43:50 -0700 (PDT) Received: from pendragon.lan (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 2198759E; Fri, 25 Mar 2022 00:43:48 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1648165428; bh=VvrfBQIx0haDL6gAqOgmX+32/7q8A7sgoMIY/EBuUBs=; h=From:To:Cc:Subject:Date:From; b=IlH3ASma4S6qw6BEdtwj5Lq052piLTSDYVeh8usm9dtEHCcSho9khLqFJlKw2OIyY dDBXulrQlcluNNH2u8IpwI7HbVR/dtZfvlYmSODZlBNqw2MjB44ozpi4lQ3yy4M5hv vsNKcpdPI3HdwESDT77+O6wqBUflXrntGXaddvDk= From: Laurent Pinchart To: linux-iio@vger.kernel.org Cc: Jonathan Cameron , Lars-Peter Clausen , Sean Nyekjaer , Jose Cazarin , Wolfram Sang , linux-i2c@vger.kernel.org, laurent.pinchart@ideasonboard.com Subject: [PATCH v2] iio: dac: dac5571: Fix chip id detection for OF devices Date: Fri, 25 Mar 2022 01:43:40 +0200 Message-Id: <20220324234340.32402-1-laurent.pinchart@ideasonboard.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org From: Jose Cazarin When matching an OF device, the match mechanism tries all components of the compatible property. This can result with a device matched with a compatible string that isn't the first in the compatible list. For instance, with a compatible property set to compatible = "ti,dac081c081", "ti,dac5571"; the driver will match the second compatible string, as the first one isn't listed in the of_device_id table. The device will however be named "dac081c081" by the I2C core. This causes an issue when identifying the chip. The probe function receives a i2c_device_id that comes from the module's I2C device ID table. There is no entry in that table for "dac081c081", which results in a NULL pointer passed to the probe function. To fix this, add chip_id information in the data field of the OF device ID table, and retrieve it with of_device_get_match_data() for OF devices. Signed-off-by: Jose Cazarin Reviewed-by: Laurent Pinchart Signed-off-by: Laurent Pinchart --- Changes since v1: - Use device_get_match_data() --- drivers/iio/dac/ti-dac5571.c | 28 ++++++++++++++++++---------- 1 file changed, 18 insertions(+), 10 deletions(-) diff --git a/drivers/iio/dac/ti-dac5571.c b/drivers/iio/dac/ti-dac5571.c index 4a3b8d875518..4f50e31dffb0 100644 --- a/drivers/iio/dac/ti-dac5571.c +++ b/drivers/iio/dac/ti-dac5571.c @@ -19,6 +19,7 @@ #include #include #include +#include #include enum chip_id { @@ -311,6 +312,7 @@ static int dac5571_probe(struct i2c_client *client, const struct dac5571_spec *spec; struct dac5571_data *data; struct iio_dev *indio_dev; + enum chip_id chip_id; int ret, i; indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); @@ -326,7 +328,13 @@ static int dac5571_probe(struct i2c_client *client, indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->channels = dac5571_channels; - spec = &dac5571_spec[id->driver_data]; + if (dev->of_node) + chip_id = (uintptr_t)device_get_match_data(dev); + else + chip_id = id->driver_data; + + spec = &dac5571_spec[chip_id]; + indio_dev->num_channels = spec->num_channels; data->spec = spec; @@ -385,15 +393,15 @@ static int dac5571_remove(struct i2c_client *i2c) } static const struct of_device_id dac5571_of_id[] = { - {.compatible = "ti,dac5571"}, - {.compatible = "ti,dac6571"}, - {.compatible = "ti,dac7571"}, - {.compatible = "ti,dac5574"}, - {.compatible = "ti,dac6574"}, - {.compatible = "ti,dac7574"}, - {.compatible = "ti,dac5573"}, - {.compatible = "ti,dac6573"}, - {.compatible = "ti,dac7573"}, + {.compatible = "ti,dac5571", .data = (void *)single_8bit}, + {.compatible = "ti,dac6571", .data = (void *)single_10bit}, + {.compatible = "ti,dac7571", .data = (void *)single_12bit}, + {.compatible = "ti,dac5574", .data = (void *)quad_8bit}, + {.compatible = "ti,dac6574", .data = (void *)quad_10bit}, + {.compatible = "ti,dac7574", .data = (void *)quad_12bit}, + {.compatible = "ti,dac5573", .data = (void *)quad_8bit}, + {.compatible = "ti,dac6573", .data = (void *)quad_10bit}, + {.compatible = "ti,dac7573", .data = (void *)quad_12bit}, {} }; MODULE_DEVICE_TABLE(of, dac5571_of_id);