linux-kernel - [PATCH v3 1/9] pinctrl: renesas: rzg2l: Clarify OEN read/write support

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Message-Id: <20240625200316.4282-2-paul.barker.ct@bp.renesas.com>
Date: Tue, 25 Jun 2024 21:03:08 +0100
From: Paul Barker <paul.barker.ct@...renesas.com>
To: Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc: Paul Barker <paul.barker.ct@...renesas.com>,
	linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/9] pinctrl: renesas: rzg2l: Clarify OEN read/write support

We currently support OEN read/write for the RZ/G3S SoC but not the
RZ/G2L SoC family (consisting of RZ/G2L, RZ/G2LC, RZ/G2UL, RZ/V2L &
RZ/Five). The appropriate functions are renamed to clarify this and to
match the callback names.

We should also only set the oen_read and oen_write function pointers for
the devices which support these operations. This requires us to check
that these function pointers are valid before calling them.

Signed-off-by: Paul Barker <paul.barker.ct@...renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
---
Changes v2->v3:
  * Picked up Linus W's Acked-by tag & Geert's Reviewed-by tag.
  * Renamed rzg3s oen functions to match the callback names.
Changes v1->v2:
  * New patch to clarify function names.

 drivers/pinctrl/renesas/pinctrl-rzg2l.c | 28 ++++++++++++-------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index 32945d4c8dc0..a2a395fd34c1 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -994,7 +994,7 @@ static bool rzg2l_ds_is_supported(struct rzg2l_pinctrl *pctrl, u32 caps,
 	return false;
 }
 
-static bool rzg2l_oen_is_supported(u32 caps, u8 pin, u8 max_pin)
+static bool rzg3s_oen_is_supported(u32 caps, u8 pin, u8 max_pin)
 {
 	if (!(caps & PIN_CFG_OEN))
 		return false;
@@ -1005,7 +1005,7 @@ static bool rzg2l_oen_is_supported(u32 caps, u8 pin, u8 max_pin)
 	return true;
 }
 
-static u8 rzg2l_pin_to_oen_bit(u32 offset, u8 pin, u8 max_port)
+static u8 rzg3s_pin_to_oen_bit(u32 offset, u8 pin, u8 max_port)
 {
 	if (pin)
 		pin *= 2;
@@ -1016,31 +1016,31 @@ static u8 rzg2l_pin_to_oen_bit(u32 offset, u8 pin, u8 max_port)
 	return pin;
 }
 
-static u32 rzg2l_read_oen(struct rzg2l_pinctrl *pctrl, u32 caps, u32 offset, u8 pin)
+static u32 rzg3s_oen_read(struct rzg2l_pinctrl *pctrl, u32 caps, u32 offset, u8 pin)
 {
 	u8 max_port = pctrl->data->hwcfg->oen_max_port;
 	u8 max_pin = pctrl->data->hwcfg->oen_max_pin;
 	u8 bit;
 
-	if (!rzg2l_oen_is_supported(caps, pin, max_pin))
+	if (!rzg3s_oen_is_supported(caps, pin, max_pin))
 		return 0;
 
-	bit = rzg2l_pin_to_oen_bit(offset, pin, max_port);
+	bit = rzg3s_pin_to_oen_bit(offset, pin, max_port);
 
 	return !(readb(pctrl->base + ETH_MODE) & BIT(bit));
 }
 
-static int rzg2l_write_oen(struct rzg2l_pinctrl *pctrl, u32 caps, u32 offset, u8 pin, u8 oen)
+static int rzg3s_oen_write(struct rzg2l_pinctrl *pctrl, u32 caps, u32 offset, u8 pin, u8 oen)
 {
 	u8 max_port = pctrl->data->hwcfg->oen_max_port;
 	u8 max_pin = pctrl->data->hwcfg->oen_max_pin;
 	unsigned long flags;
 	u8 val, bit;
 
-	if (!rzg2l_oen_is_supported(caps, pin, max_pin))
+	if (!rzg3s_oen_is_supported(caps, pin, max_pin))
 		return -EINVAL;
 
-	bit = rzg2l_pin_to_oen_bit(offset, pin, max_port);
+	bit = rzg3s_pin_to_oen_bit(offset, pin, max_port);
 
 	spin_lock_irqsave(&pctrl->lock, flags);
 	val = readb(pctrl->base + ETH_MODE);
@@ -1215,6 +1215,8 @@ static int rzg2l_pinctrl_pinconf_get(struct pinctrl_dev *pctldev,
 		break;
 
 	case PIN_CONFIG_OUTPUT_ENABLE:
+		if (!pctrl->data->oen_read)
+			return -EOPNOTSUPP;
 		arg = pctrl->data->oen_read(pctrl, cfg, _pin, bit);
 		if (!arg)
 			return -EINVAL;
@@ -1354,6 +1356,8 @@ static int rzg2l_pinctrl_pinconf_set(struct pinctrl_dev *pctldev,
 
 		case PIN_CONFIG_OUTPUT_ENABLE:
 			arg = pinconf_to_config_argument(_configs[i]);
+			if (!pctrl->data->oen_write)
+				return -EOPNOTSUPP;
 			ret = pctrl->data->oen_write(pctrl, cfg, _pin, bit, !!arg);
 			if (ret)
 				return ret;
@@ -3065,8 +3069,6 @@ static struct rzg2l_pinctrl_data r9a07g043_data = {
 #endif
 	.pwpr_pfc_lock_unlock = &rzg2l_pwpr_pfc_lock_unlock,
 	.pmc_writeb = &rzg2l_pmc_writeb,
-	.oen_read = &rzg2l_read_oen,
-	.oen_write = &rzg2l_write_oen,
 	.hw_to_bias_param = &rzg2l_hw_to_bias_param,
 	.bias_param_to_hw = &rzg2l_bias_param_to_hw,
 };
@@ -3082,8 +3084,6 @@ static struct rzg2l_pinctrl_data r9a07g044_data = {
 	.hwcfg = &rzg2l_hwcfg,
 	.pwpr_pfc_lock_unlock = &rzg2l_pwpr_pfc_lock_unlock,
 	.pmc_writeb = &rzg2l_pmc_writeb,
-	.oen_read = &rzg2l_read_oen,
-	.oen_write = &rzg2l_write_oen,
 	.hw_to_bias_param = &rzg2l_hw_to_bias_param,
 	.bias_param_to_hw = &rzg2l_bias_param_to_hw,
 };
@@ -3098,8 +3098,8 @@ static struct rzg2l_pinctrl_data r9a08g045_data = {
 	.hwcfg = &rzg3s_hwcfg,
 	.pwpr_pfc_lock_unlock = &rzg2l_pwpr_pfc_lock_unlock,
 	.pmc_writeb = &rzg2l_pmc_writeb,
-	.oen_read = &rzg2l_read_oen,
-	.oen_write = &rzg2l_write_oen,
+	.oen_read = &rzg3s_oen_read,
+	.oen_write = &rzg3s_oen_write,
 	.hw_to_bias_param = &rzg2l_hw_to_bias_param,
 	.bias_param_to_hw = &rzg2l_bias_param_to_hw,
 };
-- 
2.39.2