[v2] ata: ahci-platform: add reset control support

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>
Reviewed-by: Rob Herring <robh@kernel.org>
---
Changes since v1:
- add 'Reviewed-by:' lines

.../devicetree/bindings/ata/ahci-platform.txt      |  1 +
 drivers/ata/ahci.h                                 |  1 +
 drivers/ata/libahci_platform.c                     | 24 +++++++++++++++++++---
 3 files changed, 23 insertions(+), 3 deletions(-)

Sorry, please ignore this patch because of adding unneed lines.
I'll resend it.

Thank you,

On Tue, 27 Mar 2018 15:57:12 +0900
Kunihiko Hayashi <hayashi.kunihiko@socionext.com> wrote:

> 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>
> Reviewed-by: Rob Herring <robh@kernel.org>
> ---
> Changes since v1:
> - add 'Reviewed-by:' lines
> 
> .../devicetree/bindings/ata/ahci-platform.txt      |  1 +
>  drivers/ata/ahci.h                                 |  1 +
>  drivers/ata/libahci_platform.c                     | 24 +++++++++++++++++++---
>  3 files changed, 23 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/ata/ahci-platform.txt b/Documentation/devicetree/bindings/ata/ahci-platform.txt
> index c760ecb..f4006d3 100644
> --- a/Documentation/devicetree/bindings/ata/ahci-platform.txt
> +++ b/Documentation/devicetree/bindings/ata/ahci-platform.txt
> @@ -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"
> diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
> index a9d996e..4356ef1 100644
> --- a/drivers/ata/ahci.h
> +++ b/drivers/ata/ahci.h
> @@ -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
> diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
> index 30cc8f1..46a7624 100644
> --- a/drivers/ata/libahci_platform.c
> +++ b/drivers/ata/libahci_platform.c
> @@ -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);
>  
>  	/*
> -- 
> 2.7.4

---
Best Regards,
Kunihiko Hayashi


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On Tue, Mar 27, 2018 at 04:04:12PM +0900, Kunihiko Hayashi wrote:
> Sorry, please ignore this patch because of adding unneed lines.
> I'll resend it.

Already applied.  Can you please send a delta patch if something's not
right?

Thanks.

Hello Tejun,

On Tue, 27 Mar 2018 07:00:39 -0700
Tejun Heo <tj@kernel.org> wrote:

> On Tue, Mar 27, 2018 at 04:04:12PM +0900, Kunihiko Hayashi wrote:
> > Sorry, please ignore this patch because of adding unneed lines.
> > I'll resend it.
> 
> Already applied.  Can you please send a delta patch if something's not
> right?

Sorry I was misleading.
I thought something was added in the comment line of the patch mail, though,
there are no delta between v1 and v2 in the content. No problem to apply it!

Thank you,

---
Best Regards,
Kunihiko Hayashi


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On Wed, 28 Mar 2018 10:16:24 +0900
Kunihiko Hayashi <hayashi.kunihiko@socionext.com> wrote:

> there are no delta between v1 and v2 in the content. No problem to apply it!

Nitpick, no delta between "PATCH v2" and "RESEND PATCH v2".
Thanks,

---
Best Regards,
Kunihiko Hayashi


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