linux-kernel - Re: [PATCH v4 1/8] of: Add NVIDIA Tegra SATA controller binding

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Date:	Thu, 17 Jul 2014 14:35:15 +0300
From:	Mikko Perttunen <mperttunen@...dia.com>
To:	Hans de Goede <hdegoede@...hat.com>,
	Thierry Reding <thierry.reding@...il.com>
CC:	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"tj@...nel.org" <tj@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>
Subject: Re: [PATCH v4 1/8] of: Add NVIDIA Tegra SATA controller binding

On 17/07/14 13:23, Hans de Goede wrote:
> On 07/17/2014 09:56 AM, Mikko Perttunen wrote:
>> Also: is there a reason to not use the devm_* variants? I note that the helper code has not been able to prevent any of the ahci_platform drivers from messing up by not calling ahci_platform_put_resources.
>
> The libahci_platform.c code / ahci_platform.c code is also used for
> devices going way back who may not yet be using the new clk framework,
> so where we need to use clk_get(dev, NULL); quoting from libahci_platform.c :
>
>          for (i = 0; i < AHCI_MAX_CLKS; i++) {
>                  /*
>                   * For now we must use clk_get(dev, NULL) for the first clock,
>                   * because some platforms (da850, spear13xx) are not yet
>                   * converted to use devicetree for clocks.  For new platforms
>                   * this is equivalent to of_clk_get(dev->of_node, 0).
>                   */
>                  if (i == 0)
>                          clk = clk_get(dev, NULL);
>                  else
>                          clk = of_clk_get(dev->of_node, i);
>
>                  if (IS_ERR(clk)) {
>                          rc = PTR_ERR(clk);
>                          if (rc == -EPROBE_DEFER)
>                                  goto err_out;
>                          break;
>                  }
>                  hpriv->clks[i] = clk;
>          }
>
> And there is no devm variant of that, nor is there one to get clocks by index.
> Note that we also need ahci_platform_put_resources for runtime pm support, so
> that one is going to stay around anyways and thus there is not that much value
> in fixing this.
>

Ah, and looks like devres is used to call put_resources anyway. My mistake.
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