linux-kernel - [PATCH V3 08/15] cpufreq: mediatek: Make sram regulator optional

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Message-ID: <20220415055916.28350-9-rex-bc.chen@mediatek.com>
Date:   Fri, 15 Apr 2022 13:59:09 +0800
From:   Rex-BC Chen <rex-bc.chen@...iatek.com>
To:     <rafael@...nel.org>, <viresh.kumar@...aro.org>,
        <robh+dt@...nel.org>, <krzk+dt@...nel.org>,
        <matthias.bgg@...il.com>
CC:     <jia-wei.chang@...iatek.com>, <roger.lu@...iatek.com>,
        <hsinyi@...gle.com>, <khilman@...libre.com>,
        <angelogioacchino.delregno@...labora.com>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Rex-BC Chen <rex-bc.chen@...iatek.com>
Subject: [PATCH V3 08/15] cpufreq: mediatek: Make sram regulator optional

From: Jia-Wei Chang <jia-wei.chang@...iatek.com>

For some MediaTek SoCs, like MT8186, it's possible that the sram regulator
is shared between CPU and CCI.
We hope regulator framework can return NULL for error handling rather
than a dummy handler from regulator_get api.
Therefore, we choose to use regulator_get_optional.

Signed-off-by: Jia-Wei Chang <jia-wei.chang@...iatek.com>
Signed-off-by: Rex-BC Chen <rex-bc.chen@...iatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 drivers/cpufreq/mediatek-cpufreq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
index 4d46e823c24e..559f4a383d30 100644
--- a/drivers/cpufreq/mediatek-cpufreq.c
+++ b/drivers/cpufreq/mediatek-cpufreq.c
@@ -436,7 +436,7 @@ static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
 	}
 
 	/* Both presence and absence of sram regulator are valid cases. */
-	info->sram_reg = regulator_get_exclusive(cpu_dev, "sram");
+	info->sram_reg = regulator_get_optional(cpu_dev, "sram");
 	if (IS_ERR(info->sram_reg))
 		info->sram_reg = NULL;
 	else {
-- 
2.18.0