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c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1792482123; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=SuWKI/RUrqXAHxQn1RyYywEeadNWv9dy2AG43KMbWRg=; b=NUIaLfL5rD4fWCZZjCNXdenRMCpfsTt5DUlzX8yP8vmPTEuadwgtBf1MoUXIcRE4FlMT7o kElxRLlYiZ41ozDw== From: Sebastian Andrzej Siewior To: Dmitry Baryshkov Cc: Bjorn Andersson , Konrad Dybcio , Abel Vesa , Stephan Gerhold , AngeloGioacchino Del Regno , Liam Girdwood , Mark Brown , Clark Williams , Steven Rostedt , Ilia Lin , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: Re: [PATCH 3/3] regulator: qcom_spmi: don't take a sleeping lock in the SAW IPI Message-ID: <20261020074201.Hug86drL@linutronix.de> References: <20261019-fix-qcom-saw-v1-0-9c7ba3fc2493@oss.qualcomm.com> <20261019-fix-qcom-saw-v1-3-9c7ba3fc2493@oss.qualcomm.com> X-Mailing-List: linux-rt-devel@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20261019-fix-qcom-saw-v1-3-9c7ba3fc2493@oss.qualcomm.com> On 2026-10-19 17:39:21 [+0300], Dmitry Baryshkov wrote: > --- a/drivers/regulator/qcom_spmi-regulator.c > +++ b/drivers/regulator/qcom_spmi-regulator.c > @@ -2523,12 +2532,22 @@ static int qcom_spmi_regulator_probe(struct platform_device *pdev) > if (!reg) > return -ENODEV; > > - syscon = of_parse_phandle(node, "qcom,saw-reg", 0); > - if (syscon) { > - saw_regmap = syscon_node_to_regmap(syscon); > - of_node_put(syscon); > - if (IS_ERR(saw_regmap)) > - dev_err(dev, "ERROR reading SAW regmap\n"); > + saw = of_parse_phandle(node, "qcom,saw-reg", 0); > + if (saw) { > + saw_base = devm_of_iomap(dev, saw, 0, NULL); I was asking if the syscon could be made using a raw_spinlock_t if all users do simple reads/writes. https://lore.kernel.org/all/20260929-rbrue-suez-upstreaming-mtk-pinctrl-raw-regmap-v1-1-db92943f42cb@gmail.com/T/#u If the qcom,saw-reg registers are not shared anywhere, then this should work, too. > + of_node_put(saw); Sebastian