From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sowjanya Komatineni Subject: [PATCH v9 07/22] clk: Add API to get index of the clock parent Date: Fri, 16 Aug 2019 12:41:52 -0700 Message-ID: <1565984527-5272-8-git-send-email-skomatineni@nvidia.com> References: <1565984527-5272-1-git-send-email-skomatineni@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1565984527-5272-1-git-send-email-skomatineni@nvidia.com> Sender: linux-kernel-owner@vger.kernel.org To: thierry.reding@gmail.com, jonathanh@nvidia.com, tglx@linutronix.de, jason@lakedaemon.net, marc.zyngier@arm.com, linus.walleij@linaro.org, stefan@agner.ch, mark.rutland@arm.com Cc: pdeschrijver@nvidia.com, pgaikwad@nvidia.com, sboyd@kernel.org, linux-clk@vger.kernel.org, linux-gpio@vger.kernel.org, jckuo@nvidia.com, josephl@nvidia.com, talho@nvidia.com, skomatineni@nvidia.com, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, mperttunen@nvidia.com, spatra@nvidia.com, robh+dt@kernel.org, digetx@gmail.com, devicetree@vger.kernel.org, rjw@rjwysocki.net, viresh.kumar@linaro.org, linux-pm@vger.kernel.org List-Id: devicetree@vger.kernel.org This patch adds an API clk_hw_get_parent_index to get index of the clock parent to use during the clock restore operations on system resume. Reviewed-by: Thierry Reding Reviewed-by: Dmitry Osipenko Signed-off-by: Sowjanya Komatineni --- drivers/clk/clk.c | 17 +++++++++++++++++ include/linux/clk-provider.h | 1 + 2 files changed, 18 insertions(+) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index cbcc333aec84..12ad0e9b8591 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -1645,6 +1645,23 @@ static int clk_fetch_parent_index(struct clk_core *core, return i; } +/** + * clk_hw_get_parent_index - return the index of parent clock + * @hw: clk_hw associated with the clk being consumed + * @parent_hw: clk_hw associated with the parent of clk + * + * Fetches and returns the index of parent clock. + * If hw or parent_hw is NULL, returns -EINVAL. + */ +int clk_hw_get_parent_index(struct clk_hw *hw, struct clk_hw *parent_hw) +{ + if (!hw || !parent_hw) + return -EINVAL; + + return clk_fetch_parent_index(hw->core, parent_hw->core); +} +EXPORT_SYMBOL_GPL(clk_hw_get_parent_index); + /* * Update the orphan status of @core and all its children. */ diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index dce5521a9bf6..cce830780900 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -817,6 +817,7 @@ unsigned int clk_hw_get_num_parents(const struct clk_hw *hw); struct clk_hw *clk_hw_get_parent(const struct clk_hw *hw); struct clk_hw *clk_hw_get_parent_by_index(const struct clk_hw *hw, unsigned int index); +int clk_hw_get_parent_index(struct clk_hw *hw, struct clk_hw *parent_hw); int clk_hw_set_parent(struct clk_hw *hw, struct clk_hw *new_parent); unsigned int __clk_get_enable_count(struct clk *clk); unsigned long clk_hw_get_rate(const struct clk_hw *hw); -- 2.7.4