| Qualcomm Technologies, Inc. Standard Secure Digital Host Controller (SDHC) |
| |
| Secure Digital Host Controller provides standard host interface to SD/MMC/SDIO cards. |
| |
| Required properties: |
| - compatible : should be "qcom,sdhci-msm" |
| For SDCC version 5.0.0, MCI registers are removed from SDCC interface |
| and some registers are moved to HC. New compatible string is added to |
| support this change - "qcom,sdhci-msm-v5". |
| - reg : should contain SDHC, SD Core register map. |
| - reg-names : indicates various resources passed to driver (via reg proptery) by name. |
| Required "reg-names" are "hc_mem" and "core_mem" |
| optional ones are "tlmm_mem" |
| - interrupts : should contain SDHC interrupts. |
| - interrupt-names : indicates interrupts passed to driver (via interrupts property) by name. |
| Required "interrupt-names" are "hc_irq" and "pwr_irq". |
| - <supply-name>-supply: phandle to the regulator device tree node |
| Required "supply-name" are "vdd" and "vdd-io". |
| |
| Required alias: |
| - The slot number is specified via an alias with the following format |
| 'sdhc{n}' where n is the slot number. |
| |
| Optional Properties: |
| - interrupt-names - "status_irq". This status_irq will be used for card |
| detection. |
| - qcom,bus-width - defines the bus I/O width that controller supports. |
| Units - number of bits. The valid bus-width values are |
| 1, 4 and 8. |
| - qcom,nonremovable - specifies whether the card in slot is |
| hot pluggable or hard wired. |
| - qcom,nonhotplug - specifies the card in slot is not hot pluggable. |
| if card lost or removed manually at runtime, don't retry |
| to redetect it until next reboot probe. |
| - qcom,bus-speed-mode - specifies supported bus speed modes by host. |
| The supported bus speed modes are : |
| "HS200_1p8v" - indicates that host can support HS200 at 1.8v. |
| "HS200_1p2v" - indicates that host can support HS200 at 1.2v. |
| "DDR_1p8v" - indicates that host can support DDR mode at 1.8v. |
| "DDR_1p2v" - indicates that host can support DDR mode at 1.2v. |
| - qcom,devfreq,freq-table - specifies supported frequencies for clock scaling. |
| Clock scaling logic shall toggle between these frequencies based |
| on card load. In case the defined frequencies are over or below |
| the supported card frequencies, they will be overridden |
| during card init. In case this entry is not supplied, |
| the driver will construct one based on the card |
| supported max and min frequencies. |
| The frequencies must be ordered from lowest to highest. |
| - qcom,pm-qos-irq-type - the PM QoS request type to be used for IRQ voting. |
| Can be either "affine_cores" or "affine_irq". If not specified, will default |
| to "affine_cores". Use "affine_irq" setting in case an IRQ balancer is active, |
| and IRQ affinity changes during runtime. |
| - qcom,pm-qos-irq-cpu - specifies the CPU for which IRQ voting shall be done. |
| If "affine_cores" was specified for property 'qcom,pm-qos-irq-type' |
| then this property must be defined, and is not relevant otherwise. |
| - qcom,pm-qos-irq-latency - a tuple defining two latency values with which |
| PM QoS IRQ voting shall be done. The first value is the latecy to be used |
| when load is high (performance mode) and the second is for low loads |
| (power saving mode). |
| - qcom,pm-qos-cpu-groups - defines cpu groups mapping. |
| Each cell represnets a group, which is a cpu bitmask defining which cpus belong |
| to that group. |
| - qcom,pm-qos-<mode>-latency-us - where <mode> is either "cmdq" or "legacy". |
| An array of latency value tuples, each tuple corresponding to a cpu group in the order |
| defined in property 'qcom,pm-qos-cpu-groups'. The first value is the latecy to be used |
| when load is high (performance mode) and the second is for low loads |
| (power saving mode). These values will be used for cpu group voting for |
| command-queueing mode or legacy respectively. |
| - qcom,core_3_0v_support: an optional property that is used to fake |
| 3.0V support for SDIO devices. |
| - qcom,scaling-lower-bus-speed-mode: specifies the lower bus speed mode to be used |
| during clock scaling. If this property is not |
| defined, then it falls back to the default HS |
| bus speed mode to maintain backward compatibility. |
| |
| In the following, <supply> can be vdd (flash core voltage) or vdd-io (I/O voltage). |
| - qcom,<supply>-always-on - specifies whether supply should be kept "on" always. |
| - qcom,<supply>-lpm_sup - specifies whether supply can be kept in low power mode (lpm). |
| - qcom,<supply>-voltage_level - specifies voltage levels for supply. Should be |
| specified in pairs (min, max), units uV. |
| - qcom,<supply>-current_level - specifies load levels for supply in lpm or |
| high power mode (hpm). Should be specified in |
| pairs (lpm, hpm), units uA. |
| |
| - gpios - specifies gpios assigned for sdhc slot. |
| - qcom,gpio-names - a list of strings that map in order to the list of gpios |
| |
| Tlmm pins are specified as <clk cmd data> and starting with eMMC5.0 as |
| <clk cmd data rclk> |
| |
| - Refer to "Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt" |
| for following optional properties: |
| - pinctrl-names |
| - pinctrl-0, pinctrl-1,.. pinctrl-n |
| |
| - qcom,large-address-bus - specifies whether the soc is capable of |
| supporting larger than 32 bit address bus width. |
| |
| - qcom,wakeup-on-idle: if configured, the mmcqd thread will call |
| set_wake_up_idle(), thereby voting for it to be called on idle CPUs. |
| |
| Example: |
| |
| aliases { |
| sdhc1 = &sdhc_1; |
| }; |
| |
| sdhc_1: qcom,sdhc@f9824900 { |
| compatible = "qcom,sdhci-msm"; |
| reg = <0xf9824900 0x11c>, <0xf9824000 0x800>; |
| reg-names = "hc_mem", "core_mem"; |
| interrupts = <0 123 0>, <0 138 0>; |
| interrupt-names = "hc_irq", "pwr_irq"; |
| |
| vdd-supply = <&pm8941_l21>; |
| vdd-io-supply = <&pm8941_l13>; |
| qcom,vdd-voltage-level = <2950000 2950000>; |
| qcom,vdd-current-level = <9000 800000>; |
| |
| qcom,vdd-io-always-on; |
| qcom,vdd-io-lpm-sup; |
| qcom,vdd-io-voltage-level = <1800000 2950000>; |
| qcom,vdd-io-current-level = <6 22000>; |
| |
| qcom,devfreq,freq-table = <52000000 200000000>; |
| |
| pinctrl-names = "active", "sleep"; |
| pinctrl-0 = <&sdc1_clk_on &sdc1_cmd_on &sdc1_data_on>; |
| pinctrl-1 = <&sdc1_clk_off &sdc1_cmd_on &sdc1_data_on>; |
| |
| |
| qcom,bus-width = <4>; |
| qcom,nonremovable; |
| qcom,large-address-bus; |
| qcom,bus-speed-mode = "HS200_1p8v", "DDR_1p8v"; |
| |
| qcom,scaling-lower-bus-speed-mode = "DDR52"; |
| |
| gpios = <&msmgpio 40 0>, /* CLK */ |
| <&msmgpio 39 0>, /* CMD */ |
| <&msmgpio 38 0>, /* DATA0 */ |
| <&msmgpio 37 0>, /* DATA1 */ |
| <&msmgpio 36 0>, /* DATA2 */ |
| <&msmgpio 35 0>; /* DATA3 */ |
| qcom,gpio-names = "CLK", "CMD", "DAT0", "DAT1", "DAT2", "DAT3"; |
| |
| qcom,pm-qos-irq-type = "affine_cores"; |
| qcom,pm-qos-irq-cpu = <0>; |
| qcom,pm-qos-irq-latency = <500 100>; |
| qcom,pm-qos-cpu-groups = <0x03 0x0c>; |
| qcom,pm-qos-cmdq-latency-us = <50 100>, <50 100>; |
| qcom,pm-qos-legacy-latency-us = <50 100>, <50 100>; |
| }; |
| |
| sdhc_2: qcom,sdhc@f98a4900 { |
| qcom,pm-qos-irq-type = "affine_irq"; |
| qcom,pm-qos-irq-latency = <120 200>; |
| }; |