[media] v4l2: blackfin: select proper pinctrl state in ppi_set_params if CONFIG_PINCTRL is enabled

Multiple pinctrl states are defined for 8, 16 and 24 data pin groups in PPI peripheral.
The driver should select correct group before set up further PPI parameters.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Acked-by: Scott Jiang <scott.jiang.linux@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/blackfin/ppi.c

@@ -206,6 +206,20 @@ static int ppi_set_params(struct ppi_if *ppi, struct ppi_params *params)
 	int dma_config, bytes_per_line;
 	int hcount, hdelay, samples_per_line;
 
+#ifdef CONFIG_PINCTRL
+	static const char * const pin_state[] = {"8bit", "16bit", "24bit"};
+	struct pinctrl *pctrl;
+	struct pinctrl_state *pstate;
+
+	if (params->dlen > 24 || params->dlen <= 0)
+		return -EINVAL;
+	pctrl = devm_pinctrl_get(ppi->dev);
+	pstate = pinctrl_lookup_state(pctrl,
+				      pin_state[(params->dlen + 7) / 8 - 1]);
+	if (pinctrl_select_state(pctrl, pstate))
+		return -EINVAL;
+#endif
+
 	bytes_per_line = params->width * params->bpp / 8;
 	/* convert parameters unit from pixels to samples */
 	hcount = params->width * params->bpp / params->dlen;
@@ -316,10 +330,12 @@ struct ppi_if *ppi_create_instance(struct platform_device *pdev,
 	if (!info || !info->pin_req)
 		return NULL;
 
+#ifndef CONFIG_PINCTRL
 	if (peripheral_request_list(info->pin_req, KBUILD_MODNAME)) {
 		dev_err(&pdev->dev, "request peripheral failed\n");
 		return NULL;
 	}
+#endif
 
 	ppi = kzalloc(sizeof(*ppi), GFP_KERNEL);
 	if (!ppi) {
@@ -329,6 +345,7 @@ struct ppi_if *ppi_create_instance(struct platform_device *pdev,
 	}
 	ppi->ops = &ppi_ops;
 	ppi->info = info;
+	ppi->dev = &pdev->dev;
 
 	pr_info("ppi probe success\n");
 	return ppi;

include/media/blackfin/ppi.h

@@ -83,6 +83,7 @@ struct ppi_info {
 };
 
 struct ppi_if {
+	struct device *dev;
 	unsigned long ppi_control;
 	const struct ppi_ops *ops;
 	const struct ppi_info *info;