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spi: sh-msiof: Convert to use GPIO descriptors 

Convert GPIO chip selects in the Renesas MSIOF SPI driver from legacy
GPIO numbers to GPIO descriptors.

Notes:
  - The board file for the SH7724-based Ecovec24 development board now
    registers a GPIO descriptor lookup, instead of passing a GPIO number
    through controller_data,
  - sh_msiof_get_cs_gpios() must release all GPIOs, else
    spi_get_gpio_descs() cannot claim them during SPI controller
    registration.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Geert Uytterhoeven 2019-04-03 17:08:52 +02:00 committed by Mark Brown
parent 1a8fa5166e
commit 9fda669333
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 13 additions and 19 deletions
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12
arch/sh/boards/mach-ecovec24/setup.c
View File

@ -806,7 +806,6 @@ static struct spi_board_info spi_bus[] = {
.platform_data = &mmc_spi_info,
.max_speed_hz = 5000000,
.mode = SPI_MODE_0,
.controller_data = (void *) GPIO_PTM4,
},
};
@ -838,6 +837,14 @@ static struct platform_device msiof0_device = {
.resource = msiof0_resources,
};
static struct gpiod_lookup_table msiof_gpio_table = {
.dev_id = "spi_sh_msiof.0",
.table = {
GPIO_LOOKUP("sh7724_pfc", GPIO_PTM4, "cs", GPIO_ACTIVE_HIGH),
{ },
},
};
#endif
/* FSI */
@ -1296,12 +1303,11 @@ static int __init arch_setup(void)
gpio_request(GPIO_FN_MSIOF0_TXD, NULL);
gpio_request(GPIO_FN_MSIOF0_RXD, NULL);
gpio_request(GPIO_FN_MSIOF0_TSCK, NULL);
gpio_request(GPIO_PTM4, NULL); /* software CS control of TSYNC pin */
gpio_direction_output(GPIO_PTM4, 1); /* active low CS */
gpio_request(GPIO_PTB6, NULL); /* 3.3V power control */
gpio_direction_output(GPIO_PTB6, 0); /* disable power by default */
gpiod_add_lookup_table(&mmc_spi_gpio_table);
gpiod_add_lookup_table(&msiof_gpio_table);
spi_register_board_info(spi_bus, ARRAY_SIZE(spi_bus));
#endif

20
drivers/spi/spi-sh-msiof.c
View File

@ -549,25 +549,11 @@ static void sh_msiof_spi_read_fifo_s32u(struct sh_msiof_spi_priv *p,
static int sh_msiof_spi_setup(struct spi_device *spi)
{
struct device_node *np = spi->controller->dev.of_node;
struct sh_msiof_spi_priv *p =
spi_controller_get_devdata(spi->controller);
u32 clr, set, tmp;
if (!np) {
/*
* Use spi->controller_data for CS (same strategy as spi_gpio),
* if any. otherwise let HW control CS
*/
spi->cs_gpio = (uintptr_t)spi->controller_data;
}
if (gpio_is_valid(spi->cs_gpio)) {
gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
return 0;
}
if (spi_controller_is_slave(p->ctlr))
if (spi->cs_gpiod || spi_controller_is_slave(p->ctlr))
return 0;
if (p->native_cs_inited &&
@ -600,7 +586,7 @@ static int sh_msiof_prepare_message(struct spi_controller *ctlr,
u32 ss, cs_high;
/* Configure pins before asserting CS */
if (gpio_is_valid(spi->cs_gpio)) {
if (spi->cs_gpiod) {
ss = p->unused_ss;
cs_high = p->native_cs_high;
} else {
@ -1156,6 +1142,7 @@ static int sh_msiof_get_cs_gpios(struct sh_msiof_spi_priv *p)
gpiod = devm_gpiod_get_index(dev, "cs", i, GPIOD_ASIS);
if (!IS_ERR(gpiod)) {
devm_gpiod_put(dev, gpiod);
cs_gpios++;
continue;
}
@ -1407,6 +1394,7 @@ static int sh_msiof_spi_probe(struct platform_device *pdev)
ctlr->bits_per_word_mask = chipdata->bits_per_word_mask;
ctlr->auto_runtime_pm = true;
ctlr->transfer_one = sh_msiof_transfer_one;
ctlr->use_gpio_descriptors = true;
ret = sh_msiof_request_dma(p);
if (ret < 0)