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authorSerge Semin <Sergey.Semin@baikalelectronics.ru>2022-09-09 22:36:04 +0300
committerDamien Le Moal <damien.lemoal@opensource.wdc.com>2022-09-16 19:39:18 +0300
commit82d437e6dcb10e07e1a109d74924e30b9ec6ea56 (patch)
tree377040e3f343d9aa4b9de2cd317dbc6c5970bc33 /drivers/ata/libahci_platform.c
parent2ea4d52ad11a9234eb7252377ba873c311896997 (diff)
downloadlinux-82d437e6dcb10e07e1a109d74924e30b9ec6ea56.tar.xz
ata: libahci_platform: Convert to using platform devm-ioremap methods
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>
Diffstat (limited to 'drivers/ata/libahci_platform.c')
-rw-r--r--drivers/ata/libahci_platform.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index 32495ae96567..1e9e825d6cc5 100644
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -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;