From: Lucas Tanure <tanureal@opensource.cirrus.com>
To: Mark Brown <broonie@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J . Wysocki" <rafael@kernel.org>
Cc: <linux-kernel@vger.kernel.org>, <patches@opensource.cirrus.com>,
Lucas Tanure <tanureal@opensource.cirrus.com>
Subject: [PATCH v2] regmap: spi: Set regmap max raw r/w from max_transfer_size
Date: Mon, 13 Sep 2021 14:01:01 +0100 [thread overview]
Message-ID: <20210913130101.1577964-1-tanureal@opensource.cirrus.com> (raw)
Set regmap raw read/write from spi max_transfer_size
so regmap_raw_read/write can split the access into chunks
Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
---
Changes v2:
Sent as single patch
drivers/base/regmap/regmap-spi.c | 36 ++++++++++++++++++++++++++++----
1 file changed, 32 insertions(+), 4 deletions(-)
diff --git a/drivers/base/regmap/regmap-spi.c b/drivers/base/regmap/regmap-spi.c
index c1894e93c3788..0e6552e57ecf9 100644
--- a/drivers/base/regmap/regmap-spi.c
+++ b/drivers/base/regmap/regmap-spi.c
@@ -109,13 +109,37 @@ static const struct regmap_bus regmap_spi = {
.val_format_endian_default = REGMAP_ENDIAN_BIG,
};
+static const struct regmap_bus *regmap_get_spi_bus(struct spi_device *spi,
+ const struct regmap_config *config)
+{
+ struct spi_master *master = spi->master;
+ struct regmap_bus *bus = NULL;
+ size_t max_size = spi_max_transfer_size(spi);
+
+ if (max_size != SIZE_MAX) {
+ bus = kmemdup(®map_spi, sizeof(*bus), GFP_KERNEL);
+ if (!bus)
+ return ERR_PTR(-ENOMEM);
+ bus->free_on_exit = true;
+ bus->max_raw_read = max_size;
+ bus->max_raw_write = max_size;
+ return bus;
+ }
+
+ return ®map_spi;
+}
+
struct regmap *__regmap_init_spi(struct spi_device *spi,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name)
{
- return __regmap_init(&spi->dev, ®map_spi, &spi->dev, config,
- lock_key, lock_name);
+ const struct regmap_bus *bus = regmap_get_spi_bus(spi, config);
+
+ if (IS_ERR(bus))
+ return ERR_CAST(bus);
+
+ return __regmap_init(&spi->dev, bus, &spi->dev, config, lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__regmap_init_spi);
@@ -124,8 +148,12 @@ struct regmap *__devm_regmap_init_spi(struct spi_device *spi,
struct lock_class_key *lock_key,
const char *lock_name)
{
- return __devm_regmap_init(&spi->dev, ®map_spi, &spi->dev, config,
- lock_key, lock_name);
+ const struct regmap_bus *bus = regmap_get_spi_bus(spi, config);
+
+ if (IS_ERR(bus))
+ return ERR_CAST(bus);
+
+ return __devm_regmap_init(&spi->dev, bus, &spi->dev, config, lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__devm_regmap_init_spi);
--
2.33.0
next reply other threads:[~2021-09-13 13:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-13 13:01 Lucas Tanure [this message]
2021-09-14 12:58 ` [PATCH v2] regmap: spi: Set regmap max raw r/w from max_transfer_size Charles Keepax
2021-09-15 15:18 ` Mark Brown
2021-10-23 19:58 ` Mark Brown
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