linux-kernel - [PATCH v2 08/15] OPP: Introduce dev_pm_opp_get_freq

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Message-Id: <20230720054100.9940-9-manivannan.sadhasivam@linaro.org>
Date:   Thu, 20 Jul 2023 11:10:53 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     vireshk@...nel.org, nm@...com, sboyd@...nel.org,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        cw00.choi@...sung.com, andersson@...nel.org,
        konrad.dybcio@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     alim.akhtar@...sung.com, avri.altman@....com, bvanassche@....org,
        linux-scsi@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        quic_asutoshd@...cinc.com, quic_cang@...cinc.com,
        quic_nitirawa@...cinc.com, quic_narepall@...cinc.com,
        quic_bhaskarv@...cinc.com, quic_richardp@...cinc.com,
        quic_nguyenb@...cinc.com, quic_ziqichen@...cinc.com,
        bmasney@...hat.com, krzysztof.kozlowski@...aro.org,
        linux-kernel@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH v2 08/15] OPP: Introduce dev_pm_opp_get_freq_indexed() API

In the case of devices with multiple clocks, drivers need to specify the
frequency index for the OPP framework to get the specific frequency within
the required OPP. So let's introduce the dev_pm_opp_get_freq_indexed() API
accepting the frequency index as an argument.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/opp/core.c     | 22 ++++++++++++++++++++++
 include/linux/pm_opp.h |  8 ++++++++
 2 files changed, 30 insertions(+)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index a6d0b6b18e0e..66dc0d0cfaed 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -197,6 +197,28 @@ unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq);
 
+/**
+ * dev_pm_opp_get_freq_indexed() - Gets the frequency corresponding to an
+ *				   available opp with specified index
+ * @opp: opp for which frequency has to be returned for
+ * @index: index of the frequency within the required opp
+ *
+ * Return: frequency in hertz corresponding to the opp with specified index,
+ * else return 0
+ */
+unsigned long dev_pm_opp_get_freq_indexed(struct dev_pm_opp *opp, u32 index)
+{
+	struct opp_table *opp_table = opp->opp_table;
+
+	if (IS_ERR_OR_NULL(opp) || index >= opp_table->clk_count) {
+		pr_err("%s: Invalid parameters\n", __func__);
+		return 0;
+	}
+
+	return opp->rates[index];
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq_indexed);
+
 /**
  * dev_pm_opp_get_level() - Gets the level corresponding to an available opp
  * @opp:	opp for which level value has to be returned for
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 991f54da79b5..97eb6159fb93 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -105,6 +105,8 @@ unsigned long dev_pm_opp_get_power(struct dev_pm_opp *opp);
 
 unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp);
 
+unsigned long dev_pm_opp_get_freq_indexed(struct dev_pm_opp *opp, u32 index);
+
 unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp);
 
 unsigned int dev_pm_opp_get_required_pstate(struct dev_pm_opp *opp,
@@ -211,6 +213,12 @@ static inline unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp)
 	return 0;
 }
 
+static inline unsigned long dev_pm_opp_get_freq_indexed(struct dev_pm_opp *opp,
+						      u32 index)
+{
+	return 0;
+}
+
 static inline unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp)
 {
 	return 0;
-- 
2.25.1