linux-kernel - [PATCH 2/4] mfd: cs5535-mfd: Remove mfd

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Date:   Fri, 18 Oct 2019 13:56:06 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     broonie@...nel.org, linus.walleij@...aro.org,
        daniel.thompson@...aro.org, arnd@...db.de
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dilinger@...ued.net, Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 2/4] mfd: cs5535-mfd: Remove mfd_cell->id hack

The current implementation abuses the platform 'id' mfd_cell member
to index into the correct resources entry.  If we place all cells
into their numbered slots, we can cycle through all the cell entries
and only process the populated ones which avoids this behaviour.

Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/mfd/cs5535-mfd.c | 31 +++++++++++++------------------
 1 file changed, 13 insertions(+), 18 deletions(-)

diff --git a/drivers/mfd/cs5535-mfd.c b/drivers/mfd/cs5535-mfd.c
index 2c47afc22d24..b01e5bb4ed03 100644
--- a/drivers/mfd/cs5535-mfd.c
+++ b/drivers/mfd/cs5535-mfd.c
@@ -62,26 +62,22 @@ static int cs5535_mfd_res_disable(struct platform_device *pdev)
 static struct resource cs5535_mfd_resources[NR_BARS];
 
 static struct mfd_cell cs5535_mfd_cells[] = {
-	{
-		.id = SMB_BAR,
+	[SMB_BAR] = {
 		.name = "cs5535-smb",
 		.num_resources = 1,
 		.resources = &cs5535_mfd_resources[SMB_BAR],
 	},
-	{
-		.id = GPIO_BAR,
+	[GPIO_BAR] = {
 		.name = "cs5535-gpio",
 		.num_resources = 1,
 		.resources = &cs5535_mfd_resources[GPIO_BAR],
 	},
-	{
-		.id = MFGPT_BAR,
+	[MFGPT_BAR] = {
 		.name = "cs5535-mfgpt",
 		.num_resources = 1,
 		.resources = &cs5535_mfd_resources[MFGPT_BAR],
 	},
-	{
-		.id = PMS_BAR,
+	[PMS_BAR] = {
 		.name = "cs5535-pms",
 		.num_resources = 1,
 		.resources = &cs5535_mfd_resources[PMS_BAR],
@@ -89,8 +85,7 @@ static struct mfd_cell cs5535_mfd_cells[] = {
 		.enable = cs5535_mfd_res_enable,
 		.disable = cs5535_mfd_res_disable,
 	},
-	{
-		.id = ACPI_BAR,
+	[ACPI_BAR] = {
 		.name = "cs5535-acpi",
 		.num_resources = 1,
 		.resources = &cs5535_mfd_resources[ACPI_BAR],
@@ -115,16 +110,16 @@ static int cs5535_mfd_probe(struct pci_dev *pdev,
 		return err;
 
 	/* fill in IO range for each cell; subdrivers handle the region */
-	for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
-		int bar = cs5535_mfd_cells[i].id;
-		struct resource *r = &cs5535_mfd_resources[bar];
+	for (i = 0; i < NR_BARS; i++) {
+		struct mfd_cell *cell = &cs5535_mfd_cells[i];
+		struct resource *r = &cs5535_mfd_resources[i];
 
-		r->flags = IORESOURCE_IO;
-		r->start = pci_resource_start(pdev, bar);
-		r->end = pci_resource_end(pdev, bar);
+		if (!cell)
+			continue;
 
-		/* id is used for temporarily storing BAR; unset it now */
-		cs5535_mfd_cells[i].id = 0;
+		r->flags = IORESOURCE_IO;
+		r->start = pci_resource_start(pdev, i);
+		r->end = pci_resource_end(pdev, i);
 	}
 
 	err = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, cs5535_mfd_cells,
-- 
2.17.1