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can: flexcan: add support for PE clock source select

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Add support to select the clock source for CAN Protocol Engine (PE).
It's SoC Implementation dependent. Refer to RM for detailed definition
of each SoC. We select clock source 1 (peripheral clock) by default in
driver now, this patch adds support to parse the clock source from the DT.

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Dong Aisheng 2018-12-13 07:08:00 +00:00 committed by Marc Kleine-Budde
parent 9d73399277
commit 8c306bec2d
1 changed files with 12 additions and 2 deletions
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14
drivers/net/can/flexcan.c
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@ -275,6 +275,8 @@ struct flexcan_priv {
u8 tx_mb_idx;
u8 mb_count;
u8 mb_size;
u8 clk_src; /* clock source of CAN Protocol Engine */
u32 reg_ctrl_default;
u32 reg_imask1_default;
u32 reg_imask2_default;
@ -1369,7 +1371,10 @@ static int register_flexcandev(struct net_device *dev)
goto out_clks_disable;
reg = priv->read(&regs->ctrl);
reg |= FLEXCAN_CTRL_CLK_SRC;
if (priv->clk_src)
reg |= FLEXCAN_CTRL_CLK_SRC;
else
reg &= ~FLEXCAN_CTRL_CLK_SRC;
priv->write(reg, &regs->ctrl);
err = flexcan_chip_enable(priv);
@ -1501,6 +1506,7 @@ static int flexcan_probe(struct platform_device *pdev)
struct clk *clk_ipg = NULL, *clk_per = NULL;
struct flexcan_regs __iomem *regs;
int err, irq;
u8 clk_src = 1;
u32 clock_freq = 0;
reg_xceiver = devm_regulator_get(&pdev->dev, "xceiver");
@ -1509,9 +1515,12 @@ static int flexcan_probe(struct platform_device *pdev)
else if (IS_ERR(reg_xceiver))
reg_xceiver = NULL;
if (pdev->dev.of_node)
if (pdev->dev.of_node) {
of_property_read_u32(pdev->dev.of_node,
"clock-frequency", &clock_freq);
of_property_read_u8(pdev->dev.of_node,
"fsl,clk-source", &clk_src);
}
if (!clock_freq) {
clk_ipg = devm_clk_get(&pdev->dev, "ipg");
@ -1580,6 +1589,7 @@ static int flexcan_probe(struct platform_device *pdev)
priv->regs = regs;
priv->clk_ipg = clk_ipg;
priv->clk_per = clk_per;
priv->clk_src = clk_src;
priv->devtype_data = devtype_data;
priv->reg_xceiver = reg_xceiver;