Re: [PATCH] platform/x86: Add IMS/ZII SCU driver
From: Andy Shevchenko
Date: Fri Jan 13 2017 - 11:38:36 EST
On Wed, Jan 11, 2017 at 11:26 PM, Florian Fainelli <f.fainelli@xxxxxxxxx> wrote:
> From: Guenter Roeck <linux@xxxxxxxxxxxx>
>
> This patch adds support for the IMS (now Zodiac Inflight Innovations)
> SCU Generation 1/2/3 platform driver. This driver registers all the
> on-module peripherals: Ethernet switches (Broadcom or Marvell), I2C to
> GPIO expanders, Kontrom CPLD/I2C master, and more.
>
> Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> Signed-off-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
> ---
> Darren,
>
> This is against your "for-next" branch thanks!
I'm going to review this later, though few of comments.
> +config SCU
No, no. We have enough mess with Intel's SCU/PMIC here, not add more.
At least add manufacturer as prefix to option and file name.
Btw, Darren, would it be good idea to start creating folders to make a
bit of order in the subsystem? For first I would move Intel's PMIC/SCU
stuff to somewhere (not sure if it should be per manufacturer or per
function).
> +obj-$(CONFIG_SCU) += scu.o
For file name as well.
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/types.h>
> +#include <linux/string.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/leds.h>
> +#include <linux/platform_data/mdio-gpio.h>
> +#include <linux/platform_device.h>
> +#include <linux/gpio.h>
> +#include <linux/err.h>
> +#include <linux/dmi.h>
> +#include <linux/i2c.h>
> +#include <linux/i2c-gpio.h>
> +#include <linux/version.h>
> +#include <linux/platform_data/at24.h>
> +#include <linux/platform_data/pca953x.h>
> +#include <linux/sysfs.h>
> +#include <linux/spi/spi.h>
> +#include <linux/proc_fs.h>
> +#include <linux/seq_file.h>
> +#include <linux/netdevice.h>
> +#include <linux/rtnetlink.h>
> +#include <linux/nvmem-consumer.h>
Is it possible to keep them in order?
Do you need all of them?
Does it sound like MFD driver + individual drivers?
> +struct __packed eeprom_data {
> + unsigned short length; /* 0 - 1 */
> + unsigned char checksum; /* 2 */
> + unsigned char have_gsm_modem; /* 3 */
> + unsigned char have_cdma_modem; /* 4 */
> + unsigned char have_wifi_modem; /* 5 */
> + unsigned char have_rhdd; /* 6 */
> + unsigned char have_dvd; /* 7 */
> + unsigned char have_tape; /* 8 */
> + unsigned char have_humidity_sensor; /* 9 */
> + unsigned char have_fiber_channel; /* 10 */
> + unsigned char lru_part_number[11]; /* 11 - 21 Box Part Number */
> + unsigned char lru_revision[7]; /* 22 - 28 Box Revision */
> + unsigned char lru_serial_number[7]; /* 29 - 35 Box Serial Number */
> + unsigned char lru_date_of_manufacture[7];
> + /* 36 - 42 Box Date of Manufacture */
> + unsigned char board_part_number[11];
> + /* 43 - 53 Base Board Part Number */
> + unsigned char board_revision[7];
> + /* 54 - 60 Base Board Revision */
> + unsigned char board_serial_number[7];
> + /* 61 - 67 Base Board Serial Number */
> + unsigned char board_date_of_manufacture[7];
> + /* 68 - 74 Base Board Date of Manufacture */
> + unsigned char board_updated_date_of_manufacture[7];
> + /* 75 - 81 Updated Box Date of Manufacture */
> + unsigned char board_updated_revision[7];
> + /* 82 - 88 Updated Box Revision */
> + unsigned char dummy[7]; /* 89 - 95 spare/filler */
> +};
Would it be better to use fixed-width types here:
u8
u16
> +enum scu_version { scu1, scu2, scu3, unknown };
MANUFACTURER_SCU_VERSION_x
?
> +struct scu_data {
> + struct device *dev; /* SCU platform device */
> + struct net_device *netdev; /* Ethernet device */
> + struct platform_device *mdio_dev; /* MDIO device */
> + struct platform_device *dsa_dev; /* DSA device */
> + struct proc_dir_entry *rave_proc_dir;
> + struct mutex write_lock;
> + struct platform_device *leds_pdev[3];
> + struct i2c_adapter *adapter; /* I2C adapter */
> + struct spi_master *master; /* SPI master */
> + struct i2c_client *client[10]; /* I2C clients */
> + struct spi_device *spidev[1]; /* SPI devices */
Comments are good candidates for kernel doc.
> + const struct scu_platform_data *pdata;
> + bool have_write_magic;
> + struct eeprom_data eeprom;
> + struct nvmem_device *nvmem;
> + bool eeprom_accessible;
> + bool eeprom_valid;
unsigned int flag1:1;
unsigned int flag2:1;
?
> +/* platform data */
> +
> +static struct gpio_led pca_gpio_leds1[] = {
> + { /* bit 0 */
> + .name = "scu_status:g:RD",
> + .gpio = SCU_RD_LED_GPIO,
> + .active_low = 1,
> + .default_trigger = "heartbeat",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + },
> + { /* bit 1 */
> + .name = "scu_status:a:WLess",
> + .gpio = SCU_WLES_LED_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + },
> + { /* bit 2 */
> + .name = "scu_status:r:LDFail",
> + .gpio = SCU_LD_FAIL_LED_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + },
> + { /* bit 3 */
> + .name = "scu_status:a:SW",
> + .gpio = SCU_SW_LED_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + }
> +};
> +
> +static struct gpio_led_platform_data pca_gpio_led_info1 = {
> + .leds = pca_gpio_leds1,
> + .num_leds = ARRAY_SIZE(pca_gpio_leds1),
> +};
> +
> +static struct gpio_led pca_gpio_leds2[] = {
> + { /* bit 0 */
> + .name = "SD1:g:active",
> + .gpio = SCU_SD_ACTIVE_1_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + },
> + { /* bit 1 */
> + .name = "SD1:a:error",
> + .gpio = SCU_SD_ERROR_1_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + },
> + { /* bit 2 */
> + .name = "SD2:g:active",
> + .gpio = SCU_SD_ACTIVE_2_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + },
> + { /* bit 3 */
> + .name = "SD2:a:error",
> + .gpio = SCU_SD_ERROR_2_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + },
> + { /* bit 4 */
> + .name = "SD3:g:active",
> + .gpio = SCU_SD_ACTIVE_3_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + },
> + { /* bit 5 */
> + .name = "SD3:a:error",
> + .gpio = SCU_SD_ERROR_3_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + }
> +};
> +
> +static struct gpio_led_platform_data pca_gpio_led_info2 = {
> + .leds = pca_gpio_leds2,
> + .num_leds = ARRAY_SIZE(pca_gpio_leds2),
> +};
> +
> +static struct gpio_led pca_gpio_leds3[] = {
> + { /* bit 0 */
> + .name = "SD4:g:active",
> + .gpio = SCU_SD_ACTIVE_4_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + },
> + { /* bit 1 */
> + .name = "SD4:a:error",
> + .gpio = SCU_SD_ERROR_4_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + },
> + { /* bit 2 */
> + .name = "SD5:g:active",
> + .gpio = SCU_SD_ACTIVE_5_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + },
> + { /* bit 3 */
> + .name = "SD5:a:error",
> + .gpio = SCU_SD_ERROR_5_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + },
> + { /* bit 4 */
> + .name = "SD6:g:active",
> + .gpio = SCU_SD_ACTIVE_6_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + },
> + { /* bit 5 */
> + .name = "SD6:a:error",
> + .gpio = SCU_SD_ERROR_6_GPIO,
> + .active_low = 1,
> + .default_trigger = "none",
> + .default_state = LEDS_GPIO_DEFSTATE_OFF,
> + }
> +};
Hmm... Can you utilize device tree for that?
Or built-in device properties?
> +static struct gpio_led_platform_data pca_gpio_led_info3 = {
> + .leds = pca_gpio_leds3,
> + .num_leds = ARRAY_SIZE(pca_gpio_leds3),
> +};
> +
> +static void pca_leds_register(struct device *parent,
> + struct scu_data *data)
> +{
> + data->leds_pdev[0] =
> + platform_device_register_data(parent, "leds-gpio", 1,
> + &pca_gpio_led_info1,
> + sizeof(pca_gpio_led_info1));
> + data->leds_pdev[1] =
> + platform_device_register_data(parent, "leds-gpio", 2,
> + &pca_gpio_led_info2,
> + sizeof(pca_gpio_led_info2));
> + data->leds_pdev[2] =
> + platform_device_register_data(parent, "leds-gpio", 3,
> + &pca_gpio_led_info3,
> + sizeof(pca_gpio_led_info3));
> +}
It really sounds like MFD to me.
--
With Best Regards,
Andy Shevchenko