From patchwork Fri Jan 10 14:47:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Giulio Benetti X-Patchwork-Id: 239422 List-Id: U-Boot discussion From: giulio.benetti at benettiengineering.com (Giulio Benetti) Date: Fri, 10 Jan 2020 15:47:00 +0100 Subject: [PATCH v2 10/21] clk: imx: pfd: add set_rate() In-Reply-To: <20200110144711.81938-1-giulio.benetti@benettiengineering.com> References: <20200110144711.81938-1-giulio.benetti@benettiengineering.com> Message-ID: <20200110144711.81938-11-giulio.benetti@benettiengineering.com> Implement set_rate() for pfd. Signed-off-by: Giulio Benetti Reviewed-by: Lukasz Majewski --- drivers/clk/imx/clk-pfd.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/clk/imx/clk-pfd.c b/drivers/clk/imx/clk-pfd.c index 188b2b3b90..4ae55f5a07 100644 --- a/drivers/clk/imx/clk-pfd.c +++ b/drivers/clk/imx/clk-pfd.c @@ -52,8 +52,30 @@ static unsigned long clk_pfd_recalc_rate(struct clk *clk) return tmp; } +static unsigned long clk_pfd_set_rate(struct clk *clk, unsigned long rate) +{ + struct clk_pfd *pfd = to_clk_pfd(clk); + unsigned long parent_rate = clk_get_parent_rate(clk); + u64 tmp = parent_rate; + u8 frac; + + tmp = tmp * 18 + rate / 2; + do_div(tmp, rate); + frac = tmp; + if (frac < 12) + frac = 12; + else if (frac > 35) + frac = 35; + + writel(0x3f << (pfd->idx * 8), pfd->reg + CLR); + writel(frac << (pfd->idx * 8), pfd->reg + SET); + + return 0; +} + static const struct clk_ops clk_pfd_ops = { .get_rate = clk_pfd_recalc_rate, + .set_rate = clk_pfd_set_rate, }; struct clk *imx_clk_pfd(const char *name, const char *parent_name,