linux-kernel - [PATCH 4/6] mmc: sdhci-brcmstb: Add shutdown callback

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Date:   Mon, 13 Jan 2020 16:07:04 -0500
From:   Al Cooper <alcooperx@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Al Cooper <alcooperx@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andrew Jeffery <andrew@...id.au>,
        bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org,
        "Enrico Weigelt, metux IT consult" <info@...ux.net>,
        Faiz Abbas <faiz_abbas@...com>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        Takao Orito <orito.takao@...ionext.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH 4/6] mmc: sdhci-brcmstb: Add shutdown callback

Shutdown controller and disable it's clocks to insure max power
savings in S5 on systems that leave power on.

Signed-off-by: Al Cooper <alcooperx@...il.com>
---
 drivers/mmc/host/sdhci-brcmstb.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c
index 218176b79b6a..7ea426ba5cbc 100644
--- a/drivers/mmc/host/sdhci-brcmstb.c
+++ b/drivers/mmc/host/sdhci-brcmstb.c
@@ -161,6 +161,15 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev)
 	return res;
 }
 
+static void sdhci_brcmstb_shutdown(struct platform_device *pdev)
+{
+	int ret;
+
+	ret = sdhci_pltfm_unregister(pdev);
+	if (ret)
+		dev_err(&pdev->dev, "failed to shutdown\n");
+}
+
 MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match);
 
 static struct platform_driver sdhci_brcmstb_driver = {
@@ -171,6 +180,7 @@ static struct platform_driver sdhci_brcmstb_driver = {
 	},
 	.probe		= sdhci_brcmstb_probe,
 	.remove		= sdhci_pltfm_unregister,
+	.shutdown	= sdhci_brcmstb_shutdown,
 };
 
 module_platform_driver(sdhci_brcmstb_driver);
-- 
2.17.1