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Date: Thu, 2 Jul 2015 17:26:34 +0800
From: Orson Zhai <orsonzhai@...il.com>
To: Rob Herring <robherring2@...il.com>
Cc: Chunyan Zhang <chunyan.zhang@...eadtrum.com>,
"chris@...ntf.net" <chris@...ntf.net>,
Ulf Hansson <ulf.hansson@...aro.org>,
Lee Jones <lee.jones@...aro.org>,
Shawn Guo <shawn.guo@...aro.org>,
Grant Likely <grant.likely@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Arnd Bergmann <arnd@...db.de>, billows.wu@...eadtrum.com,
Wei Qiao (乔伟) <wei.qiao@...eadtrum.com>,
baolin.wang@...eadtrum.com, ning.yang@...eadtrum.com,
Orson Zhai(翟京) <orson.zhai@...eadtrum.com>,
jason.wu@...eadtrum.com,
"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [RFC PATCH] mmc: sprd: add MMC host driver for Spreadtrum SoC
Hi Rob,
Thanks for your quick reply.
I have one question to your last comment.
On Thu, Jul 2, 2015 at 1:50 AM, Rob Herring <robherring2@...il.com> wrote:
> On Wed, Jul 1, 2015 at 2:23 AM, Chunyan Zhang
> <chunyan.zhang@...eadtrum.com> wrote:
>> From: Billows Wu <billows.wu@...eadtrum.com>
>>
>> The Spreadtrum MMC host driver is used to support EMMC, SD, and
>> SDIO types of memory cards.
>>
>> Signed-off-by: Billows Wu <billows.wu@...eadtrum.com>
>> Reviewed-by: Orson Zhai <orson.zhai@...eadtrum.com>
>> Signed-off-by: Chunyan Zhang <chunyan.zhang@...eadtrum.com>
>> ---
>> drivers/mmc/host/sprd_sdhost.c | 1270 ++++++++++++++++++++++++++++++++
>> drivers/mmc/host/sprd_sdhost.h | 507 +++++++++++++
>> drivers/mmc/host/sprd_sdhost_debugfs.c | 213 ++++++
>> drivers/mmc/host/sprd_sdhost_debugfs.h | 27 +
>> 6 files changed, 2027 insertions(+)
>> create mode 100644 drivers/mmc/host/sprd_sdhost.c
>> create mode 100644 drivers/mmc/host/sprd_sdhost.h
>> create mode 100644 drivers/mmc/host/sprd_sdhost_debugfs.c
>> create mode 100644 drivers/mmc/host/sprd_sdhost_debugfs.h
>>
>> diff --git a/drivers/mmc/host/sprd_sdhost.c b/drivers/mmc/host/sprd_sdhost.c
>> new file mode 100644
>> index 0000000..e7a66e8
>> --- /dev/null
>> +++ b/drivers/mmc/host/sprd_sdhost.c
>> @@ -0,0 +1,1270 @@
>> +/*
>> + * linux/drivers/mmc/host/sprd_sdhost.c - Secure Digital Host Controller
>> + * Interface driver
>> + *
>> + * Copyright (C) 2015 Spreadtrum corporation.
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation; either version 2 of the License, or (at
>> + * your option) any later version.
>> + *
>> + */
>> +
>> +#include <linux/delay.h>
>> +#include <linux/dma-mapping.h>
>> +#include <linux/highmem.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
>> +#include <linux/of_gpio.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/regulator/consumer.h>
>> +#include <linux/slab.h>
>> +#include <linux/scatterlist.h>
>> +
>> +#include "sprd_sdhost.h"
>> +#include "sprd_sdhost_debugfs.h"
>> +
>> +#define DRIVER_NAME "sdhost"
>> +#define SDHOST_CAPS \
>> + (MMC_CAP_4_BIT_DATA | MMC_CAP_SD_HIGHSPEED | \
>> + MMC_CAP_ERASE | MMC_CAP_UHS_SDR50 | \
>> + MMC_CAP_CMD23 | MMC_CAP_HW_RESET)
>> +
>> +struct sdhost_caps_data {
>> + char *name;
>> + uint32_t ocr_avail;
>> + uint32_t caps;
>> + uint32_t caps2;
>> + uint32_t pm_caps;
>> + /* TODO: we will obtain these values from regulator and clock
>> + * phandles after LDO and clock function is OK
>> + */
>
> You can do fixed clocks and regulators in DT until you have a driver in place.
>
>> + uint32_t base_clk;
>> + uint32_t signal_default_voltage;
>> +};
>> +
>> +struct sdhost_caps_data sd_caps_info = {
>> + .name = "sd",
>> + .ocr_avail = MMC_VDD_29_30 | MMC_VDD_30_31,
>> + .caps = SDHOST_CAPS,
>> + .caps2 = MMC_CAP2_HC_ERASE_SZ,
>> + .pm_caps = MMC_PM_WAKE_SDIO_IRQ,
>> + .base_clk = 192000000,
>> + .signal_default_voltage = 3000000,
>> +};
>> +
>> +struct sdhost_caps_data wifi_caps_info = {
>> + .name = "wifi",
>> + .ocr_avail = MMC_VDD_165_195 | MMC_VDD_29_30 |
>> + MMC_VDD_30_31 | MMC_VDD_32_33 | MMC_VDD_33_34,
>> + .caps = SDHOST_CAPS | MMC_CAP_POWER_OFF_CARD | MMC_CAP_UHS_SDR12,
>
> Is powering off a card a capability of the SD host controller or just
> the regulator control you have?
>
>> + .pm_caps = MMC_PM_KEEP_POWER | MMC_PM_IGNORE_PM_NOTIFY,
>> + .base_clk = 76000000,
>> +};
>> +
>> +struct sdhost_caps_data emmc_caps_info = {
>> + .name = "emmc",
>> + .ocr_avail = MMC_VDD_29_30 | MMC_VDD_30_31,
>> + .caps = SDHOST_CAPS |
>> + MMC_CAP_8_BIT_DATA | MMC_CAP_UHS_SDR12 |
>> + MMC_CAP_UHS_SDR25 | MMC_CAP_UHS_DDR50 | MMC_CAP_MMC_HIGHSPEED,
>> + .caps2 = MMC_CAP2_FULL_PWR_CYCLE | MMC_CAP2_HC_ERASE_SZ,
>> + .pm_caps = MMC_PM_WAKE_SDIO_IRQ,
>> + .base_clk = 192000000,
>> + .signal_default_voltage = 1800000,
>> +};
>> +
>> +const struct of_device_id sdhost_of_match[] = {
>> + {.compatible = "sprd,sd-sdhost-3.0", .data = &sd_caps_info,},
>> + {.compatible = "sprd,wifi-sdhost-3.0", .data = &wifi_caps_info,},
>> + {.compatible = "sprd,emmc-sdhost-3.0", .data = &emmc_caps_info,},
>
> What these are connected to is irrelevant to the driver and compatible
> string. All these differences belong in the DT unless the IP blocks
> are really different.
It's my idea to let Billows do like this.
I learn from SSP part in freescale "arch/arm/boot/dts/imx28-evk.dts"
Their ssp0-ssp2 each have 2 roles, mmc or generic spi bus.
And they may write one of their combo configuration like this:
43 ssp1: ssp@...12000 {
44 compatible = "fsl,imx28-mmc";
45 bus-width = <8>;
46 wp-gpios = <&gpio0 28 0>;
47 };
48
49 ssp2: ssp@...14000 {
50 #address-cells = <1>;
51 #size-cells = <0>;
52 compatible = "fsl,imx28-spi";
53 pinctrl-names = "default";
54 pinctrl-0 = <&spi2_pins_a>;
55 status = "okay";
56
57 flash: m25p80@0 {
58 #address-cells = <1>;
59 #size-cells = <1>;
60 compatible = "sst,sst25vf016b";
61 spi-max-frequency = <40000000>;
62 reg = <0>;
63 };
64 };
Billows tell me they also have 3 roles in their sd host controller
corresponding to 3 kinds of different operation.
He used to create "sprd,name" property for this. Is it a good way or
anything else better?
Thanks,
Orson
>
> Rob
> --
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