From patchwork Mon Aug 16 16:52:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bruno Meneguele X-Patchwork-Id: 497817 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT 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 EAA0DC4320E for ; Mon, 16 Aug 2021 16:52:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D33E261056 for ; Mon, 16 Aug 2021 16:52:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232556AbhHPQxZ (ORCPT ); Mon, 16 Aug 2021 12:53:25 -0400 Received: from server34.i7host.com.br ([186.227.200.26]:47100 "EHLO server34.i7host.com.br" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229872AbhHPQxY (ORCPT ); Mon, 16 Aug 2021 12:53:24 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=smartgreen.net; s=default; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=OrBsyv6kacBNfisU0RQX4TMcMUGdXKLlH7ItSqKFb3M=; b=oAxqbvsdM+26G6Br4jVmkIdn78 76UfNeUKnVZHzsca9sHf1j1d6TAj0m8HRwPe9LcD2ZqwSZQb6lWqJNm0s6YTnfdRv7QCrMohtjg0x jeD2SaPUaDy5oRMqA9lxOV2jCYhFF++TOx/RYU4mx6M+LuXlVykePWVX/rK5yyUreqMuM/d4A/i4I hnqdkCjYtEWLLrwOO8UqJzSL/7JEjvCzm0IBhiGNkTdqWGEMtKJUrkVkQcvwQZ+joABt61cdlAowy snBmbXLUO/h9f0eokyyXSZsu++bera5sjLAspXJsXsVAPvlhvxSG5Uea/2DF5D+Cj5QAEx9w6U+vM UBIme0WA==; Received: from [177.220.172.187] (port=34271 helo=localhost) by server34.i7host.com.br with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1mFfqz-00GtZz-IF; Mon, 16 Aug 2021 13:52:50 -0300 From: Bruno Meneguele To: sre@kernel.org, robh+dt@kernel.org Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Bruno Meneguele Subject: [PATCH v4 1/2] power: supply: bq24735: add watchdog timer delay support Date: Mon, 16 Aug 2021 13:52:44 -0300 Message-Id: <20210816165245.40416-2-bruno.meneguele@smartgreen.net> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210816165245.40416-1-bruno.meneguele@smartgreen.net> References: <20210816165245.40416-1-bruno.meneguele@smartgreen.net> MIME-Version: 1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server34.i7host.com.br X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - smartgreen.net X-Get-Message-Sender-Via: server34.i7host.com.br: authenticated_id: bruno.meneguele@smartgreen.net X-Authenticated-Sender: server34.i7host.com.br: bruno.meneguele@smartgreen.net X-Source: X-Source-Args: X-Source-Dir: Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The BQ24735 charger allows the user to set the watchdog timer delay between two consecutives ChargeCurrent or ChargeVoltage command writes, if the IC doesn't receive any command before the timeout happens, the charge is turned off. This patch adds the support to the user to change the default/POR value with four discrete values: 0 - disabled 1 - enabled, 44 sec 2 - enabled, 88 sec 3 - enabled, 175 sec (default at POR) These are the options supported in the ChargeOptions register bits 13&14. Also, this patch make one additional check when poll-interval is set by the user: if the interval set is greater than the WDT timeout it'll fail during the probe stage, preventing the user to set non-compatible values between the two options. Signed-off-by: Bruno Meneguele --- Changelog: v3 - check wdt_timeout for the maximum and minimum available values drivers/power/supply/bq24735-charger.c | 54 ++++++++++++++++++++++++++ include/linux/power/bq24735-charger.h | 1 + 2 files changed, 55 insertions(+) diff --git a/drivers/power/supply/bq24735-charger.c b/drivers/power/supply/bq24735-charger.c index 3ce36d09c017..7e8d0c23df9a 100644 --- a/drivers/power/supply/bq24735-charger.c +++ b/drivers/power/supply/bq24735-charger.c @@ -45,6 +45,8 @@ /* ChargeOptions bits of interest */ #define BQ24735_CHARGE_OPT_CHG_DISABLE (1 << 0) #define BQ24735_CHARGE_OPT_AC_PRESENT (1 << 4) +#define BQ24735_CHARGE_OPT_WDT_OFFSET 13 +#define BQ24735_CHARGE_OPT_WDT (3 << BQ24735_CHARGE_OPT_WDT_OFFSET) struct bq24735 { struct power_supply *charger; @@ -156,6 +158,20 @@ static int bq24735_config_charger(struct bq24735 *charger) } } + if (pdata->wdt_timeout >= 0 && pdata->wdt_timeout <= 3) { + value = pdata->wdt_timeout; + + ret = bq24735_update_word(charger->client, BQ24735_CHARGE_OPT, + BQ24735_CHARGE_OPT_WDT, + (value << BQ24735_CHARGE_OPT_WDT_OFFSET)); + if (ret < 0) { + dev_err(&charger->client->dev, + "Failed to write watchdog timer: %d\n", + ret); + return ret; + } + } + return 0; } @@ -347,6 +363,23 @@ static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client) if (!ret) pdata->input_current = val; + ret = of_property_read_u32(np, "ti,wdt-timeout", &val); + if (!ret) { + if (val >= 0 && val <= 3) { + pdata->wdt_timeout = val; + } else { + dev_warn(&client->dev, + "Invalid value for ti,wdt-timeout: %d", + val); + } + } else { + /* Since 0 is a valid value (disabled), set something + * greater than the maximum limit accepted from the user to + * represent the "no change" state. */ + pdata->wdt_timeout = 4; + } + + pdata->ext_control = of_property_read_bool(np, "ti,external-control"); return pdata; @@ -476,6 +509,27 @@ static int bq24735_charger_probe(struct i2c_client *client, return 0; if (!charger->poll_interval) return 0; + if (charger->pdata->wdt_timeout > 0) { + int wdt_ms; + + switch (charger->pdata->wdt_timeout) { + case 1: + wdt_ms = 44000; + break; + case 2: + wdt_ms = 88000; + break; + case 3: + wdt_ms = 175000; + break; + } + + if (charger->poll_interval > wdt_ms) { + dev_err(&client->dev, + "Poll interval greater than WDT timeout\n"); + return -EINVAL; + } + } ret = devm_delayed_work_autocancel(&client->dev, &charger->poll, bq24735_poll); diff --git a/include/linux/power/bq24735-charger.h b/include/linux/power/bq24735-charger.h index 321dd009ce66..ce5a030ca111 100644 --- a/include/linux/power/bq24735-charger.h +++ b/include/linux/power/bq24735-charger.h @@ -12,6 +12,7 @@ struct bq24735_platform { uint32_t charge_current; uint32_t charge_voltage; uint32_t input_current; + uint32_t wdt_timeout; const char *name;