From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ulf Hansson Subject: [PATCH 6/9] PM / Domains: Don't attach devices in genpd with multi PM domains Date: Fri, 18 May 2018 12:31:27 +0200 Message-ID: <1526639490-12167-7-git-send-email-ulf.hansson@linaro.org> References: <1526639490-12167-1-git-send-email-ulf.hansson@linaro.org> Return-path: In-Reply-To: <1526639490-12167-1-git-send-email-ulf.hansson@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: "Rafael J . Wysocki" , linux-pm@vger.kernel.org Cc: Ulf Hansson , Greg Kroah-Hartman , Jon Hunter , Geert Uytterhoeven , Todor Tomov , Rajendra Nayak , Viresh Kumar , Vincent Guittot , Kevin Hilman , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-tegra@vger.kernel.org, Rob Herring , devicetree@vger.kernel.org List-Id: devicetree@vger.kernel.org The power-domain DT property may now contain a list of phandles, which represents that a device are partitioned across multiple PM domains. This leads to a new situation in genpd_dev_pm_attach(), as only one PM domain can be attached per device. To remain things simple for the most common configuration, when a single PM domain is used, let's treat the multiple PM domain case as being specific. In other words, let's change genpd_dev_pm_attach() to check for multiple PM domains and prevent it from attach any PM domain for this case. Instead, leave this to be managed separately, from following changes to genpd. Cc: Rob Herring Cc: devicetree@vger.kernel.org Suggested-by: Jon Hunter Signed-off-by: Ulf Hansson --- drivers/base/power/domain.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index 050ce07..4597e1c 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -2229,10 +2229,10 @@ static void genpd_dev_pm_sync(struct device *dev) * attaches the device to retrieved pm_domain ops. * * Returns 1 on successfully attached PM domain, 0 when the device don't need a - * PM domain or a negative error code in case of failures. Note that if a - * power-domain exists for the device, but it cannot be found or turned on, - * then return -EPROBE_DEFER to ensure that the device is not probed and to - * re-try again later. + * PM domain or when multiple power-domains exists for it, else a negative error + * code. Note that if a power-domain exists for the device, but it cannot be + * found or turned on, then return -EPROBE_DEFER to ensure that the device is + * not probed and to re-try again later. */ int genpd_dev_pm_attach(struct device *dev) { @@ -2243,10 +2243,18 @@ int genpd_dev_pm_attach(struct device *dev) if (!dev->of_node) return 0; + /* + * Devices with multiple PM domains must be attached separately, as we + * can only attach one PM domain per device. + */ + if (of_count_phandle_with_args(dev->of_node, "power-domains", + "#power-domain-cells") != 1) + return 0; + ret = of_parse_phandle_with_args(dev->of_node, "power-domains", "#power-domain-cells", 0, &pd_args); if (ret < 0) - return 0; + return ret; mutex_lock(&gpd_list_lock); pd = genpd_get_from_provider(&pd_args); -- 2.7.4