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[73.228.159.35]) by smtp.gmail.com with ESMTPSA id 8926c6da1cb9f-5039f2f95a1sm161358173.85.2025.07.02.08.35.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 02 Jul 2025 08:35:13 -0700 (PDT) Message-ID: <0219b698-2f1b-4fcd-bce7-0ba6f6895b11@riscstar.com> Date: Wed, 2 Jul 2025 10:35:11 -0500 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 2/8] mfd: simple-mfd-i2c: specify max_register To: Lee Jones Cc: lgirdwood@gmail.com, broonie@kernel.org, alexandre.belloni@bootlin.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, mat.jonczyk@o2.pl, dlan@gentoo.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, troymitchell988@gmail.com, guodong@riscstar.com, linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, spacemit@lists.linux.dev, linux-kernel@vger.kernel.org References: <20250627142309.1444135-1-elder@riscstar.com> <20250627142309.1444135-3-elder@riscstar.com> <20250702152618.GU10134@google.com> Content-Language: en-US From: Alex Elder In-Reply-To: <20250702152618.GU10134@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 7/2/25 10:26 AM, Lee Jones wrote: > On Fri, 27 Jun 2025, Alex Elder wrote: > >> All devices supported by simple MFD use the same 8-bit register >> 8-bit value regmap configuration. There is an option available >> for a device to specify a custome configuration, but no existing >> device uses it. >> >> Lee Jones suggested modifying the simple MFD implementation to >> remove the generality of the full regmap configuration and add a >> max_register value to the simple_mfd_data structure. This can >> be used in the regmap configuration to limit the valid register >> addresses if desired. It's simpler, and covers all existing and >> anticipated device types. > > Woah, not like this. I wanted to make the framework _more_ flexible. OK, sorry I misunderstood. I'll send another new version today that does what you suggest. Thanks a lot. -Alex > Just this should do what you want: > > diff --git a/drivers/mfd/simple-mfd-i2c.c b/drivers/mfd/simple-mfd-i2c.c > index 22159913bea0..f43be10c0e60 100644 > --- a/drivers/mfd/simple-mfd-i2c.c > +++ b/drivers/mfd/simple-mfd-i2c.c > @@ -44,6 +44,9 @@ static int simple_mfd_i2c_probe(struct i2c_client *i2c) > else > regmap_config = simple_mfd_data->regmap_config; > > + if (simple_mfd_data->max_register) > + regmap_config->max_register = simple_mfd_data->max_register; > + > regmap = devm_regmap_init_i2c(i2c, regmap_config); > if (IS_ERR(regmap)) > return PTR_ERR(regmap); > > Plus the one line change in drivers/mfd/simple-mfd-i2c.h. > >> Signed-off-by: Alex Elder >> Suggested-by: Lee Jones >> --- >> v6: - New patch, changing the simple MFD functionality >> >> drivers/mfd/simple-mfd-i2c.c | 18 ++++++------------ >> drivers/mfd/simple-mfd-i2c.h | 2 +- >> 2 files changed, 7 insertions(+), 13 deletions(-) >> >> diff --git a/drivers/mfd/simple-mfd-i2c.c b/drivers/mfd/simple-mfd-i2c.c >> index 22159913bea03..c1dc315d44dcf 100644 >> --- a/drivers/mfd/simple-mfd-i2c.c >> +++ b/drivers/mfd/simple-mfd-i2c.c >> @@ -24,27 +24,21 @@ >> >> #include "simple-mfd-i2c.h" >> >> -static const struct regmap_config regmap_config_8r_8v = { >> - .reg_bits = 8, >> - .val_bits = 8, >> -}; >> - >> static int simple_mfd_i2c_probe(struct i2c_client *i2c) >> { >> const struct simple_mfd_data *simple_mfd_data; >> - const struct regmap_config *regmap_config; >> + struct regmap_config regmap_config = { }; >> struct regmap *regmap; >> int ret; >> >> simple_mfd_data = device_get_match_data(&i2c->dev); >> >> - /* If no regmap_config is specified, use the default 8reg and 8val bits */ >> - if (!simple_mfd_data || !simple_mfd_data->regmap_config) >> - regmap_config = ®map_config_8r_8v; >> - else >> - regmap_config = simple_mfd_data->regmap_config; >> + regmap_config.reg_bits = 8; >> + regmap_config.val_bits = 8; >> + if (simple_mfd_data) >> + regmap_config.max_register = simple_mfd_data->max_register; >> >> - regmap = devm_regmap_init_i2c(i2c, regmap_config); >> + regmap = devm_regmap_init_i2c(i2c, ®map_config); >> if (IS_ERR(regmap)) >> return PTR_ERR(regmap); >> >> diff --git a/drivers/mfd/simple-mfd-i2c.h b/drivers/mfd/simple-mfd-i2c.h >> index 7cb2bdd347d97..4121fe1bc1d70 100644 >> --- a/drivers/mfd/simple-mfd-i2c.h >> +++ b/drivers/mfd/simple-mfd-i2c.h >> @@ -24,9 +24,9 @@ >> #include >> >> struct simple_mfd_data { >> - const struct regmap_config *regmap_config; >> const struct mfd_cell *mfd_cell; >> size_t mfd_cell_size; >> + unsigned int max_register; >> }; >> >> #endif /* __MFD_SIMPLE_MFD_I2C_H */ >> -- >> 2.45.2 >> >