[PATCH v4 2/7] pinctrl: renesas: rzg2l: Make QSPI register handling conditional

[Biju]

From: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>

The QSPI register at offset 0x3008 is not present on all SoCs supported by
the RZ/G2L pinctrl driver. Unconditionally reading and writing this
register during suspend/resume on hardware that lacks it can cause
undefined behaviour.

Add a qspi field to rzg2l_register_offsets to allow per-SoC declaration of
the QSPI register offset, and guard the suspend/resume accesses with a
check on that field. Populate the offset only for the RZ/{G2L,G2LC,G2UL,
Five} hardware configuration, which is where the register is known to
exist.

Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
v4:
 * New patch.
---
 drivers/pinctrl/renesas/pinctrl-rzg2l.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index bc2154b69514..ca9d4a3ec737 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -145,7 +145,7 @@
 #define SMT(off)		(0x3400 + (off) * 8)
 #define SD_CH(off, ch)		((off) + (ch) * 4)
 #define ETH_POC(off, ch)	((off) + (ch) * 4)
-#define QSPI			(0x3008)
+#define QSPI			(0x3008) /* known on RZ/{G2L,G2LC,G2UL,Five} only */
 
 #define PVDD_2500		2	/* I/O domain voltage 2.5V */
 #define PVDD_1800		1	/* I/O domain voltage <= 1.8V */
@@ -220,12 +220,14 @@ static const struct pin_config_item renesas_rzv2h_conf_items[] = {
  * @sd_ch: SD_CH register offset
  * @eth_poc: ETH_POC register offset
  * @oen: OEN register offset
+ * @qspi: QSPI register offset
  */
 struct rzg2l_register_offsets {
 	u16 pwpr;
 	u16 sd_ch;
 	u16 eth_poc;
 	u16 oen;
+	u16 qspi;
 };
 
 /**
@@ -3297,7 +3299,8 @@ static int rzg2l_pinctrl_suspend_noirq(struct device *dev)
 			cache->eth_poc[i] = readb(pctrl->base + ETH_POC(regs->eth_poc, i));
 	}
 
-	cache->qspi = readb(pctrl->base + QSPI);
+	if (regs->qspi)
+		cache->qspi = readb(pctrl->base + regs->qspi);
 	cache->oen = readb(pctrl->base + pctrl->data->hwcfg->regs.oen);
 
 	if (!atomic_read(&pctrl->wakeup_path))
@@ -3323,7 +3326,8 @@ static int rzg2l_pinctrl_resume_noirq(struct device *dev)
 			return ret;
 	}
 
-	writeb(cache->qspi, pctrl->base + QSPI);
+	if (regs->qspi)
+		writeb(cache->qspi, pctrl->base + regs->qspi);
 
 	raw_spin_lock_irqsave(&pctrl->lock, flags);
 	rzg2l_oen_write_with_pwpr(pctrl, cache->oen);
@@ -3381,6 +3385,7 @@ static const struct rzg2l_hwcfg rzg2l_hwcfg = {
 		.sd_ch = 0x3000,
 		.eth_poc = 0x300c,
 		.oen = 0x3018,
+		.qspi = QSPI,
 	},
 	.iolh_groupa_ua = {
 		/* 3v3 power source */
-- 
2.43.0