[PATCHv2] drivers: bus: simple-pm-bus: Fix compatibility with simple-bus for auxdata

From: Tony Lindgren
Date: Mon Jan 18 2021 - 02:34:49 EST

After converting am335x to probe devices with simple-pm-bus I noticed
that we are not passing auxdata for of_platform_populate() like we do
with simple-bus.

While device tree using SoCs should no longer need platform data, there
are still quite a few drivers that still need it as can be seen with
git grep OF_DEV_AUXDATA. We want to have simple-pm-bus be usable as a
replacement for simple-bus also for cases where OF_DEV_AUXDATA is still

Let's fix the issue by passing auxdata as platform data to simple-pm-bus.
That way the SoCs needing this can pass the auxdata with OF_DEV_AUXDATA.
And let's pass the auxdata for omaps to fix the issue for am335x.

As an alternative solution, adding simple-pm-bus handling directly to
drivers/of/platform.c was considered, but we would still need simple-pm-bus
device driver. So passing auxdata as platform data seems like the simplest

Fixes: 5a230524f879 ("ARM: dts: Use simple-pm-bus for genpd for am3 l4_wkup")
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
Changes since v1: Updated description, added devicetree list to Cc
arch/arm/mach-omap2/pdata-quirks.c | 1 +
drivers/bus/simple-pm-bus.c | 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-omap2/pdata-quirks.c b/arch/arm/mach-omap2/pdata-quirks.c
--- a/arch/arm/mach-omap2/pdata-quirks.c
+++ b/arch/arm/mach-omap2/pdata-quirks.c
@@ -522,6 +522,7 @@ static struct of_dev_auxdata omap_auxdata_lookup[] = {
/* Common auxdata */
+ OF_DEV_AUXDATA("simple-pm-bus", 0, NULL, omap_auxdata_lookup),
OF_DEV_AUXDATA("ti,sysc", 0, NULL, &ti_sysc_pdata),
OF_DEV_AUXDATA("pinctrl-single", 0, NULL, &pcs_pdata),
OF_DEV_AUXDATA("ti,omap-prm-inst", 0, NULL, &ti_prm_pdata),
diff --git a/drivers/bus/simple-pm-bus.c b/drivers/bus/simple-pm-bus.c
--- a/drivers/bus/simple-pm-bus.c
+++ b/drivers/bus/simple-pm-bus.c
@@ -16,6 +16,7 @@

static int simple_pm_bus_probe(struct platform_device *pdev)
+ const struct of_dev_auxdata *lookup = dev_get_platdata(&pdev->dev);
struct device_node *np = pdev->dev.of_node;

dev_dbg(&pdev->dev, "%s\n", __func__);
@@ -23,7 +24,7 @@ static int simple_pm_bus_probe(struct platform_device *pdev)

if (np)
- of_platform_populate(np, NULL, NULL, &pdev->dev);
+ of_platform_populate(np, NULL, lookup, &pdev->dev);

return 0;