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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2019-05-24 18:26:47 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2019-05-30 15:35:45 +0800
commit3c756aa346dfac5ae6b7fe81cb1c6380a20b1e41 (patch)
tree5da9b3893736445e49795fd96a261d2c571f046b /drivers/crypto
parent4befedc045367c359de8ba021120fcf3bf797992 (diff)
crypto: atmel-ecc - add support for ACPI probing on non-AT91 platforms
The Atmel/Microchip EC508A is a I2C device that could be wired into any platform, and is being used on the Linaro/96boards Secure96 mezzanine adapter. This means it could be found on any platform, even on ones that use ACPI enumeration (via PRP0001 devices). So update the code to enable this use case. This involves tweaking the bus rate discovery code to take ACPI probing into account, which records the maximum bus rate as a property of the slave device. For the atmel-ecc code, this means that the effective bus rate should never exceed the maximum rate, unless we are dealing with buggy firmware. Nonetheless, let's just use the existing plumbing to discover the bus rate and keep the existing logic intact. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/Kconfig1
-rw-r--r--drivers/crypto/atmel-ecc.c13
2 files changed, 8 insertions, 6 deletions
diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
index 177b7713bd2d..119ba073f424 100644
--- a/drivers/crypto/Kconfig
+++ b/drivers/crypto/Kconfig
@@ -521,7 +521,6 @@ config CRYPTO_DEV_ATMEL_SHA
config CRYPTO_DEV_ATMEL_ECC
tristate "Support for Microchip / Atmel ECC hw accelerator"
- depends on ARCH_AT91 || COMPILE_TEST
depends on I2C
select CRYPTO_ECDH
select CRC16
diff --git a/drivers/crypto/atmel-ecc.c b/drivers/crypto/atmel-ecc.c
index ba00e4563ca0..5705348f540f 100644
--- a/drivers/crypto/atmel-ecc.c
+++ b/drivers/crypto/atmel-ecc.c
@@ -657,11 +657,14 @@ static int atmel_ecc_probe(struct i2c_client *client,
return -ENODEV;
}
- ret = of_property_read_u32(client->adapter->dev.of_node,
- "clock-frequency", &bus_clk_rate);
- if (ret) {
- dev_err(dev, "of: failed to read clock-frequency property\n");
- return ret;
+ clk_rate = i2c_acpi_find_bus_speed(&client->adapter->dev);
+ if (!clk_rate) {
+ ret = device_property_read_u32(&client->adapter->dev,
+ "clock-frequency", &bus_clk_rate);
+ if (ret) {
+ dev_err(dev, "failed to read clock-frequency property\n");
+ return ret;
+ }
}
if (bus_clk_rate > 1000000L) {