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ata: libahci_platform: Convert to using platform devm-ioremap methods

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Currently the IOMEM AHCI registers space is mapped by means of the
two functions invocation: platform_get_resource() is used to get the very
first memory resource and devm_ioremap_resource() is called to remap that
resource. Device-managed kernel API provides a handy wrapper to perform
the same in single function call: devm_platform_ioremap_resource().

While at it seeing many AHCI platform drivers rely on having the AHCI CSR
space marked with "ahci" name let's first try to find and remap the CSR
IO-mem with that name and only if it fails fallback to getting the very
first registers space platform resource.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
This commit is contained in:
Serge Semin 2022-09-09 22:36:04 +03:00 committed by Damien Le Moal
parent 2ea4d52ad1
commit 82d437e6dc
1 changed files with 8 additions and 2 deletions
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10
drivers/ata/libahci_platform.c
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@ -402,8 +402,14 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
devres_add(dev, hpriv);
hpriv->mmio = devm_ioremap_resource(dev,
platform_get_resource(pdev, IORESOURCE_MEM, 0));
/*
* If the DT provided an "ahci" named resource, use it. Otherwise,
* fallback to using the default first resource for the device node.
*/
if (platform_get_resource_byname(pdev, IORESOURCE_MEM, "ahci"))
hpriv->mmio = devm_platform_ioremap_resource_byname(pdev, "ahci");
else
hpriv->mmio = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(hpriv->mmio)) {
rc = PTR_ERR(hpriv->mmio);
goto err_out;