linux-kernel - [PATCH v6 2/3] gpio: pca953x: define masks for addressing common and extended registers

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Message-Id: <314df7f911fda8f5584cc4384a26074848a2673b.1526490085.git.hns@goldelico.com>
Date:   Wed, 16 May 2018 19:01:25 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     galak@...eaurora.org, andy.shevchenko@...il.com,
        Rob Herring <robh+dt@...nel.org>,
        Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>
Cc:     devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, letux-kernel@...nphoenux.org,
        kernel@...a-handheld.com,
        "H. Nikolaus Schaller" <hns@...delico.com>
Subject: [PATCH v6 2/3] gpio: pca953x: define masks for addressing common and extended registers

These mask bits are to be used to map the extended register
addreseses (which are defined for an unsupported 8-bit pcal chip)
to 16 and 24 bit chips (pcal6524).

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
---
 drivers/gpio/gpio-pca953x.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 2b667166e855..c0eb679e60d4 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -56,6 +56,10 @@
 #define PCAL6524_DEBOUNCE	0x2d
 
 #define PCA_GPIO_MASK		0x00FF
+
+#define PCAL_GPIO_MASK		GENMASK(4, 0)
+#define PCAL_PINCTRL_MASK	(~PCAL_GPIO_MASK)
+
 #define PCA_INT			0x0100
 #define PCA_PCAL		0x0200
 #define PCA_LATCH_INT (PCA_PCAL | PCA_INT)
-- 
2.12.2