[PATCH V6 4/4] video: simplefb: switch to use clk_bulk API to simplify clock operations

Dong Aisheng
2018-08-31T04:45:56Z

Switching to use clk_bulk API to simplify clock operations.

Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: linux-fbdev@vger.kernel.org
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Tested-by: Thor Thayer <thor.thayer@linux.intel.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
---
v5->v6:
* address Hans's comments
v4->v5:
* fix wrong setting of par->clks_enabled
v3->v4:
* no changes
v2->v3:
* fix a build warning on x86 platform due to a wrong
of the prototype of simplefb_clocks_enable
v1->v2:
* switch to clk_bulk_get_all from of_clk_bulk_get_all
---
drivers/video/fbdev/simplefb.c | 72 +++++++++++-------------------------------
1 file changed, 18 insertions(+), 54 deletions(-)

diff --git a/drivers/video/fbdev/simplefb.c b/drivers/video/fbdev/simplefb.c
index 9a9d748..89fb1e7 100644
--- a/drivers/video/fbdev/simplefb.c
+++ b/drivers/video/fbdev/simplefb.c
@@ -181,8 +181,8 @@ struct simplefb_par {
u32 palette[PSEUDO_PALETTE_SIZE];
#if defined CONFIG_OF && defined CONFIG_COMMON_CLK
bool clks_enabled;
- unsigned int clk_count;
- struct clk **clks;
+ int clk_count;
+ struct clk_bulk_data *clks;
#endif
#if defined CONFIG_OF && defined CONFIG_REGULATOR
bool regulators_enabled;
@@ -214,37 +214,13 @@ static int simplefb_clocks_get(struct simplefb_par *par,
struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
- struct clk *clock;
- int i;

if (dev_get_platdata(&pdev->dev) || !np)
return 0;

- par->clk_count = of_clk_get_parent_count(np);
- if (!par->clk_count)
- return 0;
-
- par->clks = kcalloc(par->clk_count, sizeof(struct clk *), GFP_KERNEL);
- if (!par->clks)
- return -ENOMEM;
-
- for (i = 0; i < par->clk_count; i++) {
- clock = of_clk_get(np, i);
- if (IS_ERR(clock)) {
- if (PTR_ERR(clock) == -EPROBE_DEFER) {
- while (--i >= 0) {
- if (par->clks[i])
- clk_put(par->clks[i]);
- }
- kfree(par->clks);
- return -EPROBE_DEFER;
- }
- dev_err(&pdev->dev, "%s: clock %d not found: %ld\n",
- __func__, i, PTR_ERR(clock));
- continue;
- }
- par->clks[i] = clock;
- }
+ par->clk_count = clk_bulk_get_all(&pdev->dev, &par->clks);
+ if (par->clk_count == -EPROBE_DEFER)
+ return -EPROBE_DEFER;

return 0;
}
@@ -252,39 +228,27 @@ static int simplefb_clocks_get(struct simplefb_par *par,
static void simplefb_clocks_enable(struct simplefb_par *par,
struct platform_device *pdev)
{
- int i, ret;
+ int ret;

- for (i = 0; i < par->clk_count; i++) {
- if (par->clks[i]) {
- ret = clk_prepare_enable(par->clks[i]);
- if (ret) {
- dev_err(&pdev->dev,
- "%s: failed to enable clock %d: %d\n",
- __func__, i, ret);
- clk_put(par->clks[i]);
- par->clks[i] = NULL;
- }
- }
- }
- par->clks_enabled = true;
+ if (par->clk_count <= 0)
+ return;
+
+ ret = clk_bulk_prepare_enable(par->clk_count, par->clks);
+ if (ret)
+ dev_warn(&pdev->dev, "failed to enable clocks\n");
+ else
+ par->clks_enabled = true;
}

static void simplefb_clocks_destroy(struct simplefb_par *par)
{
- int i;
-
- if (!par->clks)
+ if (par->clk_count <= 0)
return;

- for (i = 0; i < par->clk_count; i++) {
- if (par->clks[i]) {
- if (par->clks_enabled)
- clk_disable_unprepare(par->clks[i]);
- clk_put(par->clks[i]);
- }
- }
+ if (par->clks_enabled)
+ clk_bulk_disable_unprepare(par->clk_count, par->clks);

- kfree(par->clks);
+ clk_bulk_put_all(par->clk_count, par->clks);
}
#else
static int simplefb_clocks_get(struct simplefb_par *par,
--
2.7.4