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ata: ahci-platform: add reset control support

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Add support to get and control a list of resets for the device
as optional and shared. These resets must be kept de-asserted until
the device is enabled.

This is specified as shared because some SoCs like UniPhier series
have common reset controls with all ahci controller instances.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Kunihiko Hayashi 2018-03-23 10:30:53 +09:00 committed by Tejun Heo
parent 3d6f22b74d
commit f0f56716fc
3 changed files with 23 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
Documentation/devicetree/bindings/ata/ahci-platform.txt
View file

@ -30,6 +30,7 @@ compatible:
Optional properties:
- dma-coherent : Present if dma operations are coherent
- clocks : a list of phandle + clock specifier pairs
- resets : a list of phandle + reset specifier pairs
- target-supply : regulator for SATA target power
- phys : reference to the SATA PHY node
- phy-names : must be "sata-phy"

1
drivers/ata/ahci.h
View file

@ -350,6 +350,7 @@ struct ahci_host_priv {
u32 em_msg_type; /* EM message type */
bool got_runtime_pm; /* Did we do pm_runtime_get? */
struct clk *clks[AHCI_MAX_CLKS]; /* Optional */
struct reset_control *rsts; /* Optional */
struct regulator **target_pwrs; /* Optional */
/*
* If platform uses PHYs. There is a 1:1 relation between the port number and

24
drivers/ata/libahci_platform.c
View file

@ -25,6 +25,7 @@
#include <linux/phy/phy.h>
#include <linux/pm_runtime.h>
#include <linux/of_platform.h>
#include <linux/reset.h>
#include "ahci.h"
static void ahci_host_stop(struct ata_host *host);
@ -195,7 +196,8 @@ EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators);
* following order:
* 1) Regulator
* 2) Clocks (through ahci_platform_enable_clks)
* 3) Phys
* 3) Resets
* 4) Phys
*
* If resource enabling fails at any point the previous enabled resources
* are disabled in reverse order.
@ -215,12 +217,19 @@ int ahci_platform_enable_resources(struct ahci_host_priv *hpriv)
if (rc)
goto disable_regulator;
rc = ahci_platform_enable_phys(hpriv);
rc = reset_control_deassert(hpriv->rsts);
if (rc)
goto disable_clks;
rc = ahci_platform_enable_phys(hpriv);
if (rc)
goto disable_resets;
return 0;
disable_resets:
reset_control_assert(hpriv->rsts);
disable_clks:
ahci_platform_disable_clks(hpriv);
@ -239,12 +248,15 @@ EXPORT_SYMBOL_GPL(ahci_platform_enable_resources);
* following order:
* 1) Phys
* 2) Clocks (through ahci_platform_disable_clks)
* 3) Regulator
* 3) Resets
* 4) Regulator
*/
void ahci_platform_disable_resources(struct ahci_host_priv *hpriv)
{
ahci_platform_disable_phys(hpriv);
reset_control_assert(hpriv->rsts);
ahci_platform_disable_clks(hpriv);
ahci_platform_disable_regulators(hpriv);
@ -393,6 +405,12 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev)
hpriv->clks[i] = clk;
}
hpriv->rsts = devm_reset_control_array_get_optional_shared(dev);
if (IS_ERR(hpriv->rsts)) {
rc = PTR_ERR(hpriv->rsts);
goto err_out;
}
hpriv->nports = child_nodes = of_get_child_count(dev->of_node);
/*