142 lines
4.0 KiB
Diff
142 lines
4.0 KiB
Diff
From ba6850946d9e1959be1b00f6ae06454546350c75 Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Fri, 17 Jan 2014 13:23:21 +0100
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Subject: [PATCH] ahci-platform: Add support for an optional regulator for
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sata-target power
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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.../devicetree/bindings/ata/ahci-platform.txt | 1 +
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drivers/ata/ahci.h | 2 ++
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drivers/ata/ahci_platform.c | 36 ++++++++++++++++++++--
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3 files changed, 37 insertions(+), 2 deletions(-)
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diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt
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index 3ced07d..1ac807f 100644
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--- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
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+++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
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@@ -11,6 +11,7 @@ Required properties:
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Optional properties:
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- dma-coherent : Present if dma operations are coherent
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- clocks : a list of phandle + clock specifier pairs
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+- target-supply : regulator for SATA target power
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Example:
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sata@ffe08000 {
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diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
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index c12862b..bf8100c 100644
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--- a/drivers/ata/ahci.h
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+++ b/drivers/ata/ahci.h
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@@ -37,6 +37,7 @@
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#include <linux/clk.h>
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#include <linux/libata.h>
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+#include <linux/regulator/consumer.h>
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/* Enclosure Management Control */
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#define EM_CTRL_MSG_TYPE 0x000f0000
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@@ -323,6 +324,7 @@ struct ahci_host_priv {
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u32 em_buf_sz; /* EM buffer size in byte */
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u32 em_msg_type; /* EM message type */
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struct clk *clks[AHCI_MAX_CLKS]; /* Optional */
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+ struct regulator *target_pwr; /* Optional */
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void *plat_data; /* Other platform data */
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/*
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* Optional ahci_start_engine override, if not set this gets set to the
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diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
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index 609975d..907c076 100644
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--- a/drivers/ata/ahci_platform.c
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+++ b/drivers/ata/ahci_platform.c
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@@ -192,6 +192,14 @@ static int ahci_probe(struct platform_device *pdev)
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return -ENOMEM;
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}
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+ hpriv->target_pwr = devm_regulator_get_optional(dev, "target");
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+ if (IS_ERR(hpriv->target_pwr)) {
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+ rc = PTR_ERR(hpriv->target_pwr);
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+ if (rc == -EPROBE_DEFER)
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+ return -EPROBE_DEFER;
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+ hpriv->target_pwr = NULL;
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+ }
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+
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for (i = 0; i < AHCI_MAX_CLKS; i++) {
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/*
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* For now we must use clk_get(dev, NULL) for the first clock,
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@@ -213,9 +221,15 @@ static int ahci_probe(struct platform_device *pdev)
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hpriv->clks[i] = clk;
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}
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+ if (hpriv->target_pwr) {
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+ rc = regulator_enable(hpriv->target_pwr);
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+ if (rc)
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+ goto free_clk;
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+ }
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+
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rc = ahci_enable_clks(dev, hpriv);
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if (rc)
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- goto free_clk;
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+ goto disable_regulator;
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/*
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* Some platforms might need to prepare for mmio region access,
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@@ -298,6 +312,9 @@ static int ahci_probe(struct platform_device *pdev)
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pdata->exit(dev);
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disable_unprepare_clk:
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ahci_disable_clks(hpriv);
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+disable_regulator:
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+ if (hpriv->target_pwr)
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+ regulator_disable(hpriv->target_pwr);
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free_clk:
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ahci_put_clks(hpriv);
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return rc;
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@@ -314,6 +331,9 @@ static void ahci_host_stop(struct ata_host *host)
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ahci_disable_clks(hpriv);
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ahci_put_clks(hpriv);
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+
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+ if (hpriv->target_pwr)
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+ regulator_disable(hpriv->target_pwr);
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}
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#ifdef CONFIG_PM_SLEEP
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@@ -350,6 +370,9 @@ static int ahci_suspend(struct device *dev)
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ahci_disable_clks(hpriv);
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+ if (hpriv->target_pwr)
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+ regulator_disable(hpriv->target_pwr);
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+
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return 0;
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}
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@@ -360,9 +383,15 @@ static int ahci_resume(struct device *dev)
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struct ahci_host_priv *hpriv = host->private_data;
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int rc;
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+ if (hpriv->target_pwr) {
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+ rc = regulator_enable(hpriv->target_pwr);
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+ if (rc)
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+ return rc;
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+ }
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+
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rc = ahci_enable_clks(dev, hpriv);
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if (rc)
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- return rc;
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+ goto disable_regulator;
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if (pdata && pdata->resume) {
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rc = pdata->resume(dev);
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@@ -384,6 +413,9 @@ static int ahci_resume(struct device *dev)
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disable_unprepare_clk:
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ahci_disable_clks(hpriv);
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+disable_regulator:
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+ if (hpriv->target_pwr)
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+ regulator_disable(hpriv->target_pwr);
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return rc;
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}
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--
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1.8.5.5
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