[PATCH] pinctrl: renesas: Allow the compiler to optimize away sh_pfc_pm

[Geert Uytterhoeven <geert+renesas@glider.be>]

The conversion to DEFINE_NOIRQ_DEV_PM_OPS() lost the ability of the
compiler to optimize away the struct dev_pm_ops object when it is not
needed.

Fix this by replacing the use of pm_sleep_ptr() by a custom wrapper.

Fixes: 727eb02eb753375e ("pinctrl: renesas: Switch to use DEFINE_NOIRQ_DEV_PM_OPS() helper")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
To be queued in renesas-pinctrl for v6.9.

Alternatively, one could add a unified definition:

    #define pm_psci_sleep_ptr(_ptr)        PTR_IF(IS_ENABLED(CONFIG_PM_SLEEP) && \
					  IS_ENABLED(CONFIG_ARM_PSCI_FW), (_ptr))

Since there are already separate sections for CONFIG_ARM_PSCI_FW enabled
vs. disabled, I split in two and simplified the definition.
---
 drivers/pinctrl/renesas/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/renesas/core.c b/drivers/pinctrl/renesas/core.c
index 78331d7f7cca9d8c..96d6040a8871419b 100644
--- a/drivers/pinctrl/renesas/core.c
+++ b/drivers/pinctrl/renesas/core.c
@@ -737,10 +737,12 @@ static int sh_pfc_resume_noirq(struct device *dev)
 		sh_pfc_walk_regs(pfc, sh_pfc_restore_reg);
 	return 0;
 }
+#define pm_psci_sleep_ptr(_ptr)	pm_sleep_ptr(_ptr)
 #else
 static int sh_pfc_suspend_init(struct sh_pfc *pfc) { return 0; }
 static int sh_pfc_suspend_noirq(struct device *dev) { return 0; }
 static int sh_pfc_resume_noirq(struct device *dev) { return 0; }
+#define pm_psci_sleep_ptr(_ptr)	PTR_IF(false, (_ptr))
 #endif	/* CONFIG_ARM_PSCI_FW */
 
 static DEFINE_NOIRQ_DEV_PM_OPS(sh_pfc_pm, sh_pfc_suspend_noirq, sh_pfc_resume_noirq);
@@ -1423,7 +1425,7 @@ static struct platform_driver sh_pfc_driver = {
 	.driver		= {
 		.name	= DRV_NAME,
 		.of_match_table = of_match_ptr(sh_pfc_of_table),
-		.pm	= pm_sleep_ptr(&sh_pfc_pm),
+		.pm	= pm_psci_sleep_ptr(&sh_pfc_pm),
 	},
 };
 
-- 
2.34.1