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phy: phy-ocelot-serdes: add ability to be used in a non-syscon configuration

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The phy-ocelot-serdes module has exclusively been used in a syscon setup,
from an internal CPU. The addition of external control of ocelot switches
via an existing MFD implementation means that syscon is no longer the only
interface that phy-ocelot-serdes will see.

In the MFD configuration, an IORESOURCE_REG resource will exist for the
device. Utilize this resource to be able to function in both syscon and
non-syscon configurations.

Signed-off-by: Colin Foster <colin.foster@in-advantage.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Colin Foster 2023-03-17 11:54:07 -07:00 committed by David S. Miller
parent d4671cb96f
commit 672faa7bbf
1 changed files with 9 additions and 0 deletions
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9
drivers/phy/mscc/phy-ocelot-serdes.c
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@ -494,6 +494,7 @@ static int serdes_probe(struct platform_device *pdev)
{
struct phy_provider *provider;
struct serdes_ctrl *ctrl;
struct resource *res;
unsigned int i;
int ret;
@ -503,6 +504,14 @@ static int serdes_probe(struct platform_device *pdev)
ctrl->dev = &pdev->dev;
ctrl->regs = syscon_node_to_regmap(pdev->dev.parent->of_node);
if (IS_ERR(ctrl->regs)) {
/* Fall back to using IORESOURCE_REG, if possible */
res = platform_get_resource(pdev, IORESOURCE_REG, 0);
if (res)
ctrl->regs = dev_get_regmap(ctrl->dev->parent,
res->name);
}
if (IS_ERR(ctrl->regs))
return PTR_ERR(ctrl->regs);