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[83.9.31.20]) by smtp.gmail.com with ESMTPSA id lj14-20020a170906f9ce00b0088744fc7084sm2590651ejb.38.2023.01.30.08.54.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Jan 2023 08:54:45 -0800 (PST) From: Konrad Dybcio To: linux-arm-msm@vger.kernel.org, andersson@kernel.org, agross@kernel.org, krzysztof.kozlowski@linaro.org Cc: marijn.suijten@somainline.org, Konrad Dybcio , Linus Walleij , Rob Herring , Krzysztof Kozlowski , linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 2/2] pinctrl: pinconf-generic: Add an overridable way to set bias property Date: Mon, 30 Jan 2023 17:54:35 +0100 Message-Id: <20230130165435.2347569-2-konrad.dybcio@linaro.org> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230130165435.2347569-1-konrad.dybcio@linaro.org> References: <20230130165435.2347569-1-konrad.dybcio@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org We came to a point where we sometimes we support a few dozen boards with a given SoC. Sometimes, we have to take into consideration configurations which deviate rather significatly from the reference or most common designs. In the context of pinctrl, this often comes down to wildly different pin configurations. While pins, function and drive-strength are easily overridable, the (mostly) boolean properties associated with setting bias, aren't. This wouldn't be much of a problem if they didn't differ between boards so often, preventing us from having a "nice" baseline setup without inevitably having to go with an ugly /delete-property/. Introduce logic to handle bias-type, a property which sets a single boolean type of bias on the pin (more than one type of BIAS_ does not make sense, anyway) to make it easily overridable. Signed-off-by: Konrad Dybcio --- drivers/pinctrl/pinconf-generic.c | 35 ++++++++++++++++++++++--- include/linux/pinctrl/pinconf-generic.h | 1 + 2 files changed, 32 insertions(+), 4 deletions(-) diff --git a/drivers/pinctrl/pinconf-generic.c b/drivers/pinctrl/pinconf-generic.c index 365c4b0ca465..b99c2a85486e 100644 --- a/drivers/pinctrl/pinconf-generic.c +++ b/drivers/pinctrl/pinconf-generic.c @@ -206,11 +206,38 @@ static void parse_dt_cfg(struct device_node *np, unsigned int count, unsigned long *cfg, unsigned int *ncfg) { - int i; + int i, ret; + u32 val; + + /* Let's assume only one type of bias is used.. as it should be.. */ + ret = of_property_read_u32(np, "bias-type", &val); + if (!ret) { + /* Bias properties end at idx PIN_CONFIG_BIAS_PULL_UP */ + if (ret > PIN_CONFIG_BIAS_PULL_UP) { + pr_err("invalid type: %u\n", val); + goto generic_parse; + } - for (i = 0; i < count; i++) { - u32 val; - int ret; + pr_debug("found bias type %u\n", val); + /* + * Properties between PIN_CONFIG_BIAS_PULL_DOWN and PIN_CONFIG_BIAS_PULL_UP + * have a default value of one, others default to zero. + */ + cfg[*ncfg] = pinconf_to_config_packed(val, val >= PIN_CONFIG_BIAS_PULL_DOWN); + (*ncfg)++; + + /* Start the generic property read loop where bias properties end. */ + i = PIN_CONFIG_DRIVE_OPEN_DRAIN; + } else { + /* + * If we don't set bias through bias-type, search for all DT + * properties like nothing ever happened. + */ +generic_parse: + i = 0; + } + + for (; i < count; i++) { const struct pinconf_generic_params *par = ¶ms[i]; ret = of_property_read_u32(np, par->property, &val); diff --git a/include/linux/pinctrl/pinconf-generic.h b/include/linux/pinctrl/pinconf-generic.h index d74b7a4ea154..bcf68ba1ea46 100644 --- a/include/linux/pinctrl/pinconf-generic.h +++ b/include/linux/pinctrl/pinconf-generic.h @@ -117,6 +117,7 @@ struct pinctrl_map; * presented using the packed format. */ enum pin_config_param { + /* Keep in sync with dt-bindings/pinctrl/pinconf-generic.h! */ PIN_CONFIG_BIAS_BUS_HOLD, PIN_CONFIG_BIAS_DISABLE, PIN_CONFIG_BIAS_HIGH_IMPEDANCE,