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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E48B1C46CD2 for ; Wed, 20 Dec 2023 14:59:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=BkpqoMcSg5XgeQo+Nao2MowbMt3PUkDO2O+x3UyM7JU=; b=Dzp5x/xUwU3tBf KZR6nCWTXDywp1ZtKjmkfNs/1/iF70XJem7IGWbyQJ8U05GNmf99Bb6x0HCg+834wOWeHe8nAh5iB 6ppALwn/LgDYwhg9+AkJSbg83ThOr/VguUa2vJex8kbF4AXEpZU1MTGXYzdPhg8ITFJUPb5Rv8iiV GLp9U8f4s/gh2vJwTeix9aIHLXAXDPrAKJJBIE3UKH19O7a5UYTYkwtO/XJ2raB/6P5jRV/pHfikm tWPH3VCnLMpzy3qLRqqBv7cy9gymvHNYMQ7nBkIixcaa9QZ/EOMLzDs1gYE91dR8tFltazckXaOjz +rG4/xCzj1834IJi8e8Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rFy2f-0009ba-0u; Wed, 20 Dec 2023 14:59:25 +0000 Received: from mx07-00178001.pphosted.com ([185.132.182.106]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rFy2Y-0009Xb-0Z for linux-arm-kernel@lists.infradead.org; Wed, 20 Dec 2023 14:59:19 +0000 Received: from pps.filterd (m0241204.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.17.1.22/8.17.1.22) with ESMTP id 3BKAQ6fK020548; Wed, 20 Dec 2023 15:59:12 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=foss.st.com; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding:content-type; s= selector1; bh=xp/c+t2tNZhdwFtDsDw7WOFKDiPnT7aLbJzsg/uPGbU=; b=ow 37LzVWvaya8fQSmAHh7y02MQed+lC2CFI1uTwI/U68pNoCr7Zm0vdlvWzlokKF6n V7ujIqtCFKdDHMMHux+lXMaU/PR7eZa63qgpfiYyyWdP90Czlqm9AfGipIXK9qRJ t/gg4nDLRSn3q1pio+WKI8Nr2SsHWgf97X34YtDbccG/qn//X7pctkk5X1Uxdohy MjVRwj6KW+FC1QJshx1u4p97a4ajVEVr0nI3zausHHhPbWmef8tP57WeCjLh1MQf sm2rcg0u9NqzK2wZEaO+ggbIv6d3hINwuZdb2cjqaCkXLCre6GN14b453nIWNEc8 2YgBziwRiUoDjUKHbiMA== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com (PPS) with ESMTPS id 3v144225p9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 20 Dec 2023 15:59:12 +0100 (CET) Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 20886100057; Wed, 20 Dec 2023 15:59:11 +0100 (CET) Received: from Webmail-eu.st.com (shfdag1node2.st.com [10.75.129.70]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 153DC21B51F; Wed, 20 Dec 2023 15:59:11 +0100 (CET) Received: from localhost (10.201.20.59) by SHFDAG1NODE2.st.com (10.75.129.70) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Wed, 20 Dec 2023 15:59:10 +0100 From: Fabrice Gasnier To: CC: , , , , , , Subject: [PATCH v3 08/10] counter: stm32-timer-cnt: probe number of channels from registers Date: Wed, 20 Dec 2023 15:57:24 +0100 Message-ID: <20231220145726.640627-9-fabrice.gasnier@foss.st.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231220145726.640627-1-fabrice.gasnier@foss.st.com> References: <20231220145726.640627-1-fabrice.gasnier@foss.st.com> MIME-Version: 1.0 X-Originating-IP: [10.201.20.59] X-ClientProxiedBy: EQNCAS1NODE3.st.com (10.75.129.80) To SHFDAG1NODE2.st.com (10.75.129.70) X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-20_09,2023-12-20_01,2023-05-22_02 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231220_065918_504241_B3C4BA55 X-CRM114-Status: GOOD ( 13.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Probe the number of capture compare channels, by writing CCER register bits and read them back. Take care to restore the register original value. This is a precursor patch to support capture channels. Signed-off-by: Fabrice Gasnier --- Changes in v3: - New patch split from: "counter: stm32-timer-cnt: populate capture channels and check encoder" --- drivers/counter/stm32-timer-cnt.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/counter/stm32-timer-cnt.c b/drivers/counter/stm32-timer-cnt.c index 55eb6af34750..b5dc4378fecf 100644 --- a/drivers/counter/stm32-timer-cnt.c +++ b/drivers/counter/stm32-timer-cnt.c @@ -43,6 +43,7 @@ struct stm32_timer_cnt { struct stm32_timer_regs bak; bool has_encoder; u32 idx; + unsigned int nchannels; }; static const enum counter_function stm32_count_functions[] = { @@ -417,6 +418,20 @@ static struct counter_count stm32_counts = { .num_ext = ARRAY_SIZE(stm32_count_ext) }; +static void stm32_timer_cnt_detect_channels(struct platform_device *pdev, + struct stm32_timer_cnt *priv) +{ + u32 ccer, ccer_backup; + + regmap_read(priv->regmap, TIM_CCER, &ccer_backup); + regmap_set_bits(priv->regmap, TIM_CCER, TIM_CCER_CCXE); + regmap_read(priv->regmap, TIM_CCER, &ccer); + regmap_write(priv->regmap, TIM_CCER, ccer_backup); + priv->nchannels = hweight32(ccer & TIM_CCER_CCXE); + + dev_dbg(&pdev->dev, "has %d cc channels\n", priv->nchannels); +} + /* encoder supported on TIM1 TIM2 TIM3 TIM4 TIM5 TIM8 */ #define STM32_TIM_ENCODER_SUPPORTED (BIT(0) | BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(7)) @@ -484,6 +499,8 @@ static int stm32_timer_cnt_probe(struct platform_device *pdev) if (ret) return ret; + stm32_timer_cnt_detect_channels(pdev, priv); + counter->name = dev_name(dev); counter->parent = dev; counter->ops = &stm32_timer_cnt_ops; -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel