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Message-Id: <2cf38c10b83c8e5c04d68b17a930b6d9dbf66f40.1716973640.git.geert+renesas@glider.be>
Date: Wed, 29 May 2024 11:12:13 +0200
From: Geert Uytterhoeven <geert+renesas@...der.be>
To: Marc Kleine-Budde <mkl@...gutronix.de>,
Vincent Mailhol <mailhol.vincent@...adoo.fr>,
Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc: linux-can@...r.kernel.org,
linux-renesas-soc@...r.kernel.org,
netdev@...r.kernel.org,
Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH 1/3] can: rcar_canfd: Simplify clock handling
The main CAN clock is either the internal CANFD clock, or the external
CAN clock. Hence replace the two-valued enum by a simple boolean flag.
Consolidate all CANFD clock handling inside a single branch.
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
drivers/net/can/rcar/rcar_canfd.c | 24 +++++++-----------------
1 file changed, 7 insertions(+), 17 deletions(-)
diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index b828427187353d6f..474840b58e8f13f1 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -508,12 +508,6 @@
*/
#define RCANFD_CFFIFO_IDX 0
-/* fCAN clock select register settings */
-enum rcar_canfd_fcanclk {
- RCANFD_CANFDCLK = 0, /* CANFD clock */
- RCANFD_EXTCLK, /* Externally input clock */
-};
-
struct rcar_canfd_global;
struct rcar_canfd_hw_info {
@@ -545,8 +539,8 @@ struct rcar_canfd_global {
struct platform_device *pdev; /* Respective platform device */
struct clk *clkp; /* Peripheral clock */
struct clk *can_clk; /* fCAN clock */
- enum rcar_canfd_fcanclk fcan; /* CANFD or Ext clock */
unsigned long channels_mask; /* Enabled channels mask */
+ bool extclk; /* CANFD or Ext clock */
bool fdmode; /* CAN FD or Classical CAN only mode */
struct reset_control *rstc1;
struct reset_control *rstc2;
@@ -777,7 +771,7 @@ static void rcar_canfd_configure_controller(struct rcar_canfd_global *gpriv)
cfg |= RCANFD_GCFG_CMPOC;
/* Set External Clock if selected */
- if (gpriv->fcan != RCANFD_CANFDCLK)
+ if (gpriv->extclk)
cfg |= RCANFD_GCFG_DCS;
rcar_canfd_set_bit(gpriv->base, RCANFD_GCFG, cfg);
@@ -1941,16 +1935,12 @@ static int rcar_canfd_probe(struct platform_device *pdev)
return dev_err_probe(dev, PTR_ERR(gpriv->can_clk),
"cannot get canfd clock\n");
- gpriv->fcan = RCANFD_CANFDCLK;
-
+ /* CANFD clock may be further divided within the IP */
+ fcan_freq = clk_get_rate(gpriv->can_clk) / info->postdiv;
} else {
- gpriv->fcan = RCANFD_EXTCLK;
+ fcan_freq = clk_get_rate(gpriv->can_clk);
+ gpriv->extclk = true;
}
- fcan_freq = clk_get_rate(gpriv->can_clk);
-
- if (gpriv->fcan == RCANFD_CANFDCLK)
- /* CANFD clock is further divided by (1/2) within the IP */
- fcan_freq /= info->postdiv;
addr = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(addr)) {
@@ -2060,7 +2050,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, gpriv);
dev_info(dev, "global operational state (clk %d, fdmode %d)\n",
- gpriv->fcan, gpriv->fdmode);
+ gpriv->extclk, gpriv->fdmode);
return 0;
fail_channel:
--
2.34.1
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