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From: Geert Uytterhoeven <geert+renesas@glider.be>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	Ulrich Hecht <uli+renesas@fpond.eu>,
	Biju Das <biju.das.jz@bp.renesas.com>,
	linux-renesas-soc@vger.kernel.org, linux-gpio@vger.kernel.org,
	Geert Uytterhoeven <geert+renesas@glider.be>
Subject: [PATCH 4/8] pinctrl: renesas: Optimize sh_pfc_pin_config
Date: Wed, 28 Oct 2020 16:16:33 +0100	[thread overview]
Message-ID: <20201028151637.1734130-5-geert+renesas@glider.be> (raw)
In-Reply-To: <20201028151637.1734130-1-geert+renesas@glider.be>

Shrink sh_pfc_pin_config from 8 to 2 bytes:
  - The mux_set flag can be removed, as a non-zero mark value means the
    same (zero = PINMUX_RESERVED is an invalid mark value),
  - The gpio_enabled flag needs only a single bit,
  - Mark values are small integers, and can easily fit in a 15-bit
    bitfield.

This saves 6 bytes per pin when allocating the sh_pfc_pinctrl.configs
array, i.e. it reduces run-time memory consumption by ca. 1.5 KiB.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/pinctrl/renesas/pinctrl.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/pinctrl/renesas/pinctrl.c b/drivers/pinctrl/renesas/pinctrl.c
index 8e54f9b662f37f37..d34079726039c39d 100644
--- a/drivers/pinctrl/renesas/pinctrl.c
+++ b/drivers/pinctrl/renesas/pinctrl.c
@@ -26,9 +26,8 @@
 #include "../pinconf.h"
 
 struct sh_pfc_pin_config {
-	unsigned int mux_mark;
-	bool mux_set;
-	bool gpio_enabled;
+	u16 gpio_enabled:1;
+	u16 mux_mark:15;
 };
 
 struct sh_pfc_pinctrl {
@@ -371,12 +370,11 @@ static int sh_pfc_func_set_mux(struct pinctrl_dev *pctldev, unsigned selector,
 			goto done;
 	}
 
-	/* All group pins are configured, mark the pins as mux_set */
+	/* All group pins are configured, mark the pins as muxed */
 	for (i = 0; i < grp->nr_pins; ++i) {
 		int idx = sh_pfc_get_pin_index(pfc, grp->pins[i]);
 		struct sh_pfc_pin_config *cfg = &pmx->configs[idx];
 
-		cfg->mux_set = true;
 		cfg->mux_mark = grp->mux[i];
 	}
 
@@ -432,7 +430,7 @@ static void sh_pfc_gpio_disable_free(struct pinctrl_dev *pctldev,
 	spin_lock_irqsave(&pfc->lock, flags);
 	cfg->gpio_enabled = false;
 	/* If mux is already set, this configures it here */
-	if (cfg->mux_set)
+	if (cfg->mux_mark)
 		sh_pfc_config_mux(pfc, cfg->mux_mark, PINMUX_TYPE_FUNCTION);
 	spin_unlock_irqrestore(&pfc->lock, flags);
 }
-- 
2.25.1


  parent reply	other threads:[~2020-10-28 22:24 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-28 15:16 [PATCH 0/8] pinctrl: renesas: Cleanups and improvements Geert Uytterhoeven
2020-10-28 15:16 ` [PATCH 1/8] pinctrl: renesas: Remove superfluous goto in sh_pfc_gpio_set_direction() Geert Uytterhoeven
2020-10-28 15:16 ` [PATCH 2/8] pinctrl: renesas: Singular/plural grammar fixes Geert Uytterhoeven
2020-10-28 15:16 ` [PATCH 3/8] pinctrl: renesas: Reorder struct sh_pfc_pin to remove hole Geert Uytterhoeven
2020-11-05  9:52   ` Linus Walleij
2020-11-05  9:58     ` Geert Uytterhoeven
2020-10-28 15:16 ` Geert Uytterhoeven [this message]
2020-10-28 15:16 ` [PATCH 5/8] pinctrl: renesas: Factor out common R-Car Gen3 bias handling Geert Uytterhoeven
2020-10-28 15:16 ` [PATCH 6/8] pinctrl: renesas: r8a7778: Use physical addresses for PUPR regs Geert Uytterhoeven
2020-10-28 15:16 ` [PATCH 7/8] pinctrl: renesas: r8a7778: Use common R-Car bias handling Geert Uytterhoeven
2020-10-28 15:16 ` [PATCH 8/8] pinctrl: renesas: Protect GPIO leftovers by CONFIG_PINCTRL_SH_FUNC_GPIO Geert Uytterhoeven
2020-11-05  9:54 ` [PATCH 0/8] pinctrl: renesas: Cleanups and improvements Linus Walleij

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