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 <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

arch/sh/boards/mach-ecovec24/setup.c

···
 		.platform_data	= &mmc_spi_info,
 		.max_speed_hz	= 5000000,
 		.mode		= SPI_MODE_0,
-		.controller_data = (void *) GPIO_PTM4,
 	},
 };
 
···
 	},
 	.num_resources	= ARRAY_SIZE(msiof0_resources),
 	.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
···
 	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
 

drivers/spi/spi-sh-msiof.c

···
 
 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 &&
···
 	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 {
···
 
 		gpiod = devm_gpiod_get_index(dev, "cs", i, GPIOD_ASIS);
 		if (!IS_ERR(gpiod)) {
+			devm_gpiod_put(dev, gpiod);
 			cs_gpios++;
 			continue;
 		}
···
 	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)