From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wolfram Sang Subject: Re: [PATCH] i2c: i2c-stm32f7: Add I2C_SMBUS_I2C_BLOCK_DATA support Date: Wed, 26 Jun 2019 15:45:35 +0200 Message-ID: <20190626134535.GN801@ninjato> References: <1559654451-26612-1-git-send-email-fabrice.gasnier@st.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="8MZM6zh5Bb05FW+3" Return-path: Content-Disposition: inline In-Reply-To: <1559654451-26612-1-git-send-email-fabrice.gasnier@st.com> Sender: linux-kernel-owner@vger.kernel.org To: Fabrice Gasnier Cc: pierre-yves.mordret@st.com, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, linux-i2c@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org List-Id: linux-i2c@vger.kernel.org --8MZM6zh5Bb05FW+3 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jun 04, 2019 at 03:20:51PM +0200, Fabrice Gasnier wrote: > This patch adds the support of I2C_SMBUS_I2C_BLOCK_DATA transaction type > for the stm32f7 SMBUS Controller. > Use emulated I2C_SMBUS_I2C_BLOCK_DATA transactions as there is no specific > hardware in STM32 I2C to manage this (e.g. like no need for PEC here). > Emulated transfer will fall back calling i2c transfer method where there's > already support for DMAs for example. > So, use the I2C_FUNC_SMBUS_I2C_BLOCK in stm32f7_i2c_func(), and rely on > emulated transfer by returning -EOPNOTSUPP in the smbus_xfer() routine > for such a case. >=20 > Signed-off-by: Fabrice Gasnier Maintainers? > --- > drivers/i2c/busses/i2c-stm32f7.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) >=20 > diff --git a/drivers/i2c/busses/i2c-stm32f7.c b/drivers/i2c/busses/i2c-st= m32f7.c > index 48337be..68a751e 100644 > --- a/drivers/i2c/busses/i2c-stm32f7.c > +++ b/drivers/i2c/busses/i2c-stm32f7.c > @@ -953,6 +953,9 @@ static int stm32f7_i2c_smbus_xfer_msg(struct stm32f7_= i2c_dev *i2c_dev, > cr2 &=3D ~STM32F7_I2C_CR2_RD_WRN; > f7_msg->read_write =3D I2C_SMBUS_READ; > break; > + case I2C_SMBUS_I2C_BLOCK_DATA: > + /* Rely on emulated i2c transfer (through master_xfer) */ > + return -EOPNOTSUPP; > default: > dev_err(dev, "Unsupported smbus protocol %d\n", f7_msg->size); > return -EOPNOTSUPP; > @@ -1803,7 +1806,8 @@ static u32 stm32f7_i2c_func(struct i2c_adapter *ada= p) > I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | > I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | > I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_BLOCK_PROC_CALL | > - I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_PEC; > + I2C_FUNC_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_PEC | > + I2C_FUNC_SMBUS_I2C_BLOCK; > } > =20 > static struct i2c_algorithm stm32f7_i2c_algo =3D { > --=20 > 2.7.4 >=20 --8MZM6zh5Bb05FW+3 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAl0Tdv8ACgkQFA3kzBSg KbY34A/8CYpfe2MHsAqTGHO1tyGPc3Fuatefa6I/N/YHYLpWoSl3mpGia6mLK7s7 gpUm/ClB+7Sl5KKdUaQ2zbvDtBPKQHfpZ/2QAYgBIoTVpf+snQLYRv4I5EiDD9Hs EAD+2gH3nxPCHu4q/J97lT/wq4o5IxeyzsLHxeRnnBB+Ziov+9Zoad5ug3f6jRTp KcL9B7T1Is0CU4xlqO/m3sHiRgfzIjovv7l6UIWd4JgRCiXerqkDuaZ7kp/rin5h 4JQplk9UxamamgkjDexY/CE1Jk2ZN1NYLck574DAFO2J0CpGsYYu+ykC046A1H2i 1yPfuLWy6Ie3IHHmf0CWJOw9h0o0oxmZQkTiX8WoXwUAozrodjbHo5asLK8V+F+z mjv8YhvXjbZRePtqpusnwtU7p4kXNhfi2skCNUPMqEQlAMgHecagto0+rDcfy6qI icB1x3LegvBoO1wWRilTvjYAYC5/gFLSdqppZVYGF5kEEzmJ1Q/Tv+Ekb3fUbgEz 50riYWCnCoOdCs6S2XNb8/aSgHkU+6sjRNA7hCJCNNLPxcMobmUCk5V2R56GWjPW 4z30wWy4vO3eo4CtH7WDUsMDnxiNK4lxqMkiPZPXgcJRl+SDnIPsyWrQKN9CCNoq c2br40VJ1gnvj0OX0TSKItNmxc5K4Q1iQWGiEwmA7DMumfDW9Kw= =as2l -----END PGP SIGNATURE----- --8MZM6zh5Bb05FW+3--