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sata: ahci-da850: get the sata clock using a connection id 

In preparation for using two clocks in the driver (the sysclk2-based
clock and the external REFCLK), check if we got the functional clock
after calling ahci_platform_get_resources(). If not, retry calling
clk_get() with con_id specified.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
This commit is contained in:
Bartosz Golaszewski 2017-01-30 11:02:01 +01:00 committed by Sekhar Nori
parent 7ce7d89f48
commit 82dbe1a68f
1 changed files with 16 additions and 0 deletions
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16
drivers/ata/ahci_da850.c
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@ -71,12 +71,28 @@ static int ahci_da850_probe(struct platform_device *pdev)
struct ahci_host_priv *hpriv;
struct resource *res;
void __iomem *pwrdn_reg;
struct clk *clk;
int rc;
hpriv = ahci_platform_get_resources(pdev);
if (IS_ERR(hpriv))
return PTR_ERR(hpriv);
/*
* Internally ahci_platform_get_resources() calls clk_get(dev, NULL)
* when trying to obtain the functional clock. This SATA controller
* uses two clocks for which we specify two connection ids. If we don't
* have the functional clock at this point - call clk_get() again with
* con_id = "fck".
*/
if (!hpriv->clks[0]) {
clk = clk_get(dev, "fck");
if (IS_ERR(clk))
return PTR_ERR(clk);
hpriv->clks[0] = clk;
}
rc = ahci_platform_enable_resources(hpriv);
if (rc)
return rc;