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Wysocki" , Sanjay R Mehta , Nehal Bakulchandra Shah CC: , , , Lucas Tanure Subject: [PATCH 1/9] regmap: spi: Set regmap max raw r/w from max_transfer_size Date: Tue, 24 Aug 2021 11:40:33 +0100 Message-ID: <20210824104041.708945-2-tanureal@opensource.cirrus.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210824104041.708945-1-tanureal@opensource.cirrus.com> References: <20210824104041.708945-1-tanureal@opensource.cirrus.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Proofpoint-ORIG-GUID: oMLmr4mPeWacfxMOAEzYu65nb8i0--Dd X-Proofpoint-GUID: oMLmr4mPeWacfxMOAEzYu65nb8i0--Dd X-Proofpoint-Spam-Reason: safe Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- drivers/base/regmap/regmap-spi.c | 34 ++++++++++++++++++++++++++++---- 1 file changed, 30 insertions(+), 4 deletions(-) diff --git a/drivers/base/regmap/regmap-spi.c b/drivers/base/regmap/regmap-spi.c index c1894e93c378..603a4c1c2066 100644 --- a/drivers/base/regmap/regmap-spi.c +++ b/drivers/base/regmap/regmap-spi.c @@ -109,13 +109,35 @@ 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; + + if (master->max_transfer_size) { + bus = kmemdup(®map_spi, sizeof(*bus), GFP_KERNEL); + if (!bus) + return ERR_PTR(-ENOMEM); + bus->free_on_exit = true; + bus->max_raw_read = bus->max_raw_write = master->max_transfer_size(spi); + 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 +146,12 @@ 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